CN109555113B - Concrete precast pile with axial length compensation function - Google Patents
Concrete precast pile with axial length compensation function Download PDFInfo
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- CN109555113B CN109555113B CN201910049959.7A CN201910049959A CN109555113B CN 109555113 B CN109555113 B CN 109555113B CN 201910049959 A CN201910049959 A CN 201910049959A CN 109555113 B CN109555113 B CN 109555113B
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- 239000004567 concrete Substances 0.000 title claims abstract description 39
- 230000004323 axial length Effects 0.000 title claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 47
- 238000006073 displacement reaction Methods 0.000 claims abstract description 46
- 230000007704 transition Effects 0.000 claims abstract description 44
- 230000008569 process Effects 0.000 claims abstract description 38
- 230000002457 bidirectional effect Effects 0.000 claims description 70
- 230000007246 mechanism Effects 0.000 claims description 50
- 238000005096 rolling process Methods 0.000 claims description 15
- 239000011178 precast concrete Substances 0.000 claims description 10
- 238000007667 floating Methods 0.000 abstract description 29
- 210000002105 tongue Anatomy 0.000 description 88
- 239000002689 soil Substances 0.000 description 14
- 238000010276 construction Methods 0.000 description 11
- 239000004927 clay Substances 0.000 description 8
- 230000013011 mating Effects 0.000 description 5
- 238000003825 pressing Methods 0.000 description 5
- 239000004576 sand Substances 0.000 description 5
- 229920006395 saturated elastomer Polymers 0.000 description 5
- 238000010009 beating Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000003068 static effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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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
- E02D5/24—Prefabricated piles
-
- 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
- E02D5/24—Prefabricated piles
- E02D5/30—Prefabricated piles made of concrete or reinforced concrete or made of steel and concrete
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The utility model provides a concrete precast pile with axial length compensation function, includes footer, end stake, transition stake and length automatic compensating device, and length automatic compensating device includes piston body, cylinder body, limit screw, one-way axle shift locking mechanical system, and one-way axle shift locking mechanical system sets up between piston body and cylinder body, is in under the state before the atress removes at one-way axle shift locking mechanical system, and by limit screw axial fixed connection an organic whole between piston body and the cylinder body, the cylinder body is fixed on the end stake, and the piston body is fixed on the transition stake. The automatic length compensating device is characterized in that the piston body and the cylinder body are respectively subjected to limiting opposite tensile force, an axial limiting screw connecting the piston body and the cylinder body is broken, the piston body can have a certain amount of axial unidirectional displacement relative to the cylinder body, and the upper pile body can generate a certain amount of upward displacement distance relative to the bottom pile, so that the requirement of the upward displacement dimension of the whole pile body required by the floating pile is met, and broken piles or hanging foot piles caused by the floating pile in the piling process can be eliminated.
Description
Technical field:
the invention relates to a concrete precast pile structural member, in particular to a concrete precast pile with a length compensation function, wherein a pile body can be automatically compensated in the length direction after pile soil floats upwards.
The background technology is as follows:
in the building construction process, especially in the building process of high-rise buildings, concrete precast pile structural members are generally used for constructing the foundation of the building so as to bear the dead load and the use load of the high-rise building. The existing precast concrete pile structural members generally comprise tubular piles and square piles, and the upper section and the lower section of the precast concrete pile structural members are welded together through steel end plates. The pile driving mode can be divided into a hammering pile driving method and a static pile pressing method, and no matter the pile is a square pile or an impact pile driving method or a static pile driving method, after pile group driving is finished, the ground of the building foundation often rises to drive the precast pile to float. The prefabricated pile foundation in the hard clay is usually represented by a pile body floating upwards to generate a hanging foot pile; the prefabricated pile foundation of the shallow dense sand soil layer is usually characterized in that the upper pile body floats up a large amount and the lower pile body is relatively fixed, and the pile foundation is represented as a broken pile or a hanging foot pile. The welding strength of the joints between pile connections is generally smaller than the self strength of the pile body, the compressive strength of the pipe pile is large, but the tensile strength is lower, the joints between piles are the weakest links, the tensile strength of the precast concrete piles is the most easily broken pile joints under the action of the ultimate tensile strength, and broken piles or hanging foot piles are all shown at the joints or pile ends of the piles.
Two consequences are generated after the pile body floats, the first is that after the pile body floats upwards as a whole, the lower end of the end pile is pulled out to form a commonly called 'hanging foot pile', and the bearing capacity of the pile end is greatly reduced or eliminated; and the second is that the pile body section of the precast pile floats upwards while the lower section is fixed and does not float upwards, so that the pile body is broken by pulling to form a so-called broken pile, which is shown that only the upper section of the precast pile has bearing capacity, and the lower section of the broken pile does not exert bearing function. Both performances can be demonstrated and analyzed by static load tests. The damage of the floating pile is mainly represented by the following points:
after pile floating, no matter cause "hang foot stake" or "broken stake", the bearing capacity of pile body can not satisfy building load requirement, and the building will take place to subside by a relatively big margin, if produce the differential settlement then the result is more serious, very probably causes building structure fracture or deformation, can lead to the building slope to exceed standard when serious, initiates deformation or fracture of whole building structure, directly influences the function of use and the security of building, still can cause the collapse of building under extreme case.
The bearing capacity of foundation engineering pile detects disqualification, and not only needs to take a long time to repair, but also repair cost is very high, and the construction period of the house is delayed, so that the reputation of a developer is directly influenced.
At present, the conventional methods for treating floating piles are as follows:
after precast piles in cohesive soil float upwards, a repeated beating or re-pressing method is usually adopted for processing, and the repeated beating or re-pressing is effective, but cannot solve the problem fundamentally, because the measure for solving the floating upwards has no logical relevance with the reason for forming the floating upwards.
The prefabricated piles in the dense sand layer are floated upwards, and the re-pressing or re-beating basically has no effect or has very limited effect.
According to the soil layer which can generate the floating of the precast pile, some preventive measures, such as commonly adopted hole guiding measures, can be adopted for hundred percent hole guiding, can also be adopted for hole guiding according to a certain proportion, the hole guiding depth is determined according to the soil layer characteristics, and the general hole guiding depth is not more than seventy percent of the effective pile length. However, after the hole guiding measures are adopted, the floating phenomenon of the precast pile can only be reduced, the floating problem of the precast pile is difficult to thoroughly solve, and secondary treatment is often needed.
Before the precast pile is constructed in the saturated soft clay, sand piles or plastic drainage bodies can be arranged in the soil body in advance so as to eliminate the excess pore water pressure generated after the precast pile is arranged, and the method has a certain effect on reducing soil body bulge, but can not completely eliminate pile body floating.
Aiming at the pile section with the bearing capacity deficiency, the prior effective measure is to carry out high-pressure jet grouting treatment after the construction, but the construction difficulty is high, the construction can be carried out only by special equipment, the cost is high, and the construction period is long.
In summary, no matter what method is used to deal with the floating pile problem afterwards, the double loss of construction period and cost is an extra burden for engineering. To the best of applicant's knowledge, no effective method for solving the floating pile problem of concrete precast piles in advance has been known in the industry so far.
The applicant has conducted long-term research and analysis on the cause of floating piles generated by concrete precast piles, and the phenomenon of floating piles is extremely easy to form in the following pile soil combinations:
the method comprises the steps that firstly, saturated hard clay is incompressible in a short time, when the saturated hard clay enters a precast pile, due to extremely low permeability, the soil property is incompressible in a short time relative to the pile forming period of the precast pile, soil is extruded upwards under the action of the volume increment of the precast pile, and the upward moving soil drags a pile body to move upwards to form a floating pile phenomenon;
shallow or upper portion soil body is more closely knit sand layer, and when the pile pressing stress release, shallow soil body produces upwards resilience, and shallow or upper portion closely knit sand is enough with the downward friction of lower part pile body to overcome to the upward frictional force of pile body, drags the pile body wholly to move upwards, forms the floating pile phenomenon.
The saturated soft clay also has short-time incompressibility, but the upward friction force of the saturated soft clay to the precast pile is insufficient to overcome the embedding force of the precast pile at the lower part, so that the floating phenomenon of the precast pile is not obvious.
When the soil between piles is old clay and the pile ends are weathered rocks, the earth surface is obviously raised after piling due to the low compressibility of the old clay, so that a floating pile phenomenon is formed.
In order to effectively solve the problems of floating piles and broken piles of the concrete precast pile, the applicant has discovered a concrete precast pile with a length compensation function, which can automatically compensate the length of a pile body floating additional pile body, thereby ensuring that the load of a building is effectively transferred to the whole pile body and eliminating the phenomenon of 'hanging foot piles' or 'broken piles'.
The invention comprises the following steps:
the invention aims to provide a concrete precast pile with an axial length compensation function, which can solve the problem that the concrete precast pile automatically compensates the deformation of the pile body length in the process of floating pile occurrence and effectively prevents the pile body from pile hanging or pile breaking.
The technical scheme adopted by the invention is as follows:
a concrete precast pile with axial length compensation function is characterized in that: the automatic length compensation device comprises a piston body, a cylinder body, limit screws and a unidirectional shaft displacement locking mechanism, wherein the unidirectional shaft displacement locking mechanism is arranged between the piston body and the cylinder body, and the piston body and the cylinder body are axially and fixedly connected into a whole by the limit screws in a state before the unidirectional shaft displacement locking mechanism is forced to move; when the concrete pile body is a single-section pile, the length automatic compensation device is arranged at the bottom of the concrete pile body, the piston body is fixed on the concrete pile body, and when the concrete pile body is a two-section pile consisting of a top pile and a bottom pile, the length automatic compensation device is arranged between the top pile and the bottom pile, the cylinder body is fixed on the bottom pile, and the piston body is fixed on the top pile; when the concrete pile body is a multi-section pile comprising a top pile, a bottom pile and a transition pile, the length automatic compensation device is arranged between the top pile and the bottom pile, the cylinder body is fixed on the bottom pile or the transition pile, and the piston body is fixed on the transition pile or the top pile.
Further, the concrete multisection pile comprises a transition pile, the transition pile is arranged between the top pile and the bottom pile, the length automatic compensation device is arranged between the bottom pile and the transition pile, the cylinder body of the length automatic compensation device is fixed on the bottom pile, and the piston body is fixed on the transition pile.
Further, the concrete multi-section pile comprises more than two transition piles, the transition piles are arranged between the top pile and the bottom pile after being connected in series, the length automatic compensation device is arranged between the bottom pile and the transition pile, a cylinder body of the length automatic compensation device is fixed on the bottom pile, and a piston body is fixed on the transition pile; or the length automatic compensation device is arranged between the two transition piles, the cylinder body of the length automatic compensation device is fixed on the transition pile below, and the piston body is fixed on the transition pile above.
Further, the unidirectional shaft displacement locking mechanism comprises a unidirectional spring bolt, a bidirectional spring bolt, a spring, a process pin, a unidirectional locking groove and a bidirectional locking groove which are sleeved in the piston body, wherein the unidirectional locking groove and the bidirectional locking groove are formed in the inner side surface of the matching inner hole of the cylinder body, and the unidirectional spring bolt sliding groove and the bidirectional spring bolt sliding groove are axially formed along the matching cylinder body of the piston body; a unidirectional locking groove and a bidirectional locking groove are axially arranged in a matching inner hole of the cylinder body, the lower end face of the unidirectional locking groove is a plane, the side face is an arc face or an inclined plane, the cross section of the bidirectional locking groove is rectangular, the side face of a locking end of the unidirectional locking bolt is an arc face or an inclined plane, the unidirectional locking bolt is inserted in a unidirectional locking bolt chute, a spring is arranged between the tail part of the unidirectional locking bolt and the piston body, the bidirectional locking bolt is inserted in the bidirectional locking bolt chute, the spring is arranged between the tail part of the bidirectional lock tongue and the piston body, all the unidirectional lock tongue and the bidirectional lock tongue are limited in the piston body through the process pin, the overhanging ends of all the unidirectional lock tongue and the bidirectional lock tongue are contracted in the outer surface of the matched cylinder, the piston body and the unidirectional lock tongue, the bidirectional lock tongue, the spring and the process pin are combined in the matched inner hole of the cylinder body in a sleeved mode, and the piston body and the cylinder body are axially and fixedly connected through limit screws.
Further, in the unidirectional shaft displacement locking mechanism, N unidirectional bolt groups and one bidirectional bolt group are arranged at intervals along the axial direction of the piston body, each unidirectional bolt group is uniformly distributed with two or more unidirectional bolts in the circumferential direction of the piston body, and each bidirectional bolt group is uniformly distributed with two or more bidirectional bolts in the circumferential direction of the piston body.
Still further, two one-way spring bolts of one-way spring bolt group along the circumference evenly distributed of piston body, two-way spring bolts of two-way spring bolt group along the circumference evenly distributed of piston body, two-way spring bolt setting are in the below of one-way spring bolt.
Further, the bidirectional bolt sliding groove is arranged below the unidirectional bolt sliding groove, and the number of the unidirectional bolt sliding grooves above the bidirectional bolt sliding groove is 0-3.
Further, the unidirectional shaft shift locking mechanism comprises a unidirectional lock tongue, a bidirectional lock tongue, a spring and a process pin, wherein a unidirectional lock tongue groove and a bidirectional lock tongue groove are axially arranged on a matched cylinder of the piston body at intervals, the upper end face of the unidirectional lock tongue groove is a plane, the side face of the unidirectional lock tongue groove is a cambered surface or an inclined plane, the cross section of the bidirectional lock tongue groove is rectangular, the side face of an overhanging end of the unidirectional lock tongue is a cambered surface or an inclined plane, a unidirectional lock chute and a bidirectional lock chute are axially arranged on the side wall of the cylinder body at intervals, the unidirectional lock tongue is inserted in the unidirectional lock chute, the spring is arranged between the tail of the unidirectional lock tongue and the cylinder body, the bidirectional lock tongue is inserted in the bidirectional lock chute, the spring is arranged between the tail of the bidirectional lock tongue and the cylinder body, all the unidirectional lock tongue and the bidirectional lock tongue are limited and installed in the cylinder body through the process pin, the locking ends of all the unidirectional lock tongue and the bidirectional lock tongue are contracted in the surface of the inner hole of the cylinder body, and are fixedly connected by an axial limit screw before the piston body is sleeved in the matched inner hole of the cylinder body.
Still further, the one-way spring bolt group includes two one-way spring bolts of the circumference symmetric distribution along cylinder body cooperation hole, and two-way spring bolt group includes two-way spring bolts of circumference symmetric distribution along cylinder body cooperation hole, and two-way spring bolt setting is in the below of one-way spring bolt, and the setting quantity of the one-way spring bolt groove in the top of two-way spring bolt groove is 0-3.
Further, the one-way shaft shift locking mechanism comprises a rotating lock tongue, a two-way lock tongue, springs, a process pin and a process mandrel, wherein a one-way limit groove and a two-way lock tongue groove are axially arranged on a matched cylinder of the piston body at intervals, the upper end face of the one-way limit groove is a plane, the cross section of the two-way lock tongue groove is rectangular, the overhanging end of the rotating lock tongue is a plane, the rotating lock tongue is axially arranged along the inner hole side wall of the cylinder body at intervals, the lower end of the rotating lock tongue is hinged with the inner hole side wall of the cylinder body, the springs are arranged between the upper section of the rotating lock tongue and the cylinder body, two-way lock sliding grooves are horizontally arranged on the cylinder body and are arranged above the rotating lock tongue, the two-way lock tongue is inserted in the two-way lock sliding grooves, the springs are arranged between the tail part of the two-way lock tongue and the cylinder body, all the rotating lock tongues are limited in the cylinder body through the process mandrel, the two-way lock tongue is mounted in the cylinder body through the process pin at intervals, the piston body is pressed by the process mandrel when the piston body is sleeved, and the piston body is fixedly connected by an axial limit screw when the bottom end of the matched cylinder body contacts the bottom surface of the cylinder body.
Further, the unidirectional shaft displacement locking mechanism is a unidirectional rolling locking mechanism, the side wall of the matching section between the matching hole of the cylinder body and the piston body is uniformly provided with a rolling slideway which is inclined and is high and low, and rolling bodies are arranged in the rolling slideway.
In the present invention, the one-way shaft displacement locking mechanism has many other functionally-substituted structures, such as: all schemes of the unidirectional wedge locking mechanism or unidirectional toggle locking mechanism and the like, which can enable the piston body and the cylinder body to generate axial unidirectional displacement locking function under the state of opposite pulling force, belong to the protection scope of the invention.
Because the length automatic compensation device is additionally arranged in the concrete precast pile connecting component, a one-way shaft displacement locking mechanism is arranged between the piston body and the cylinder body of the length automatic compensation device, and the axial limit screw connecting the piston body and the cylinder body is broken under the condition that the piston body and the cylinder body are respectively subjected to limit opposite tensile force, the piston body can have a certain amount of axial one-way displacement relative to the cylinder body, and even if a floating pile phenomenon occurs in the piling process, the one-way shaft displacement locking mechanism can enable a jack pile or a transition pile to generate a certain amount of upward displacement distance relative to a bottom pile, thereby meeting the requirement of the upward displacement dimension of the whole pile body required by the floating pile and eliminating broken piles or hanging foot piles caused by the occurrence of the floating pile in the piling process.
Description of the drawings:
FIG. 1 is a schematic diagram of a structure of the present invention, in which an automatic length compensation device is disposed at the top of a foundation pile and is in a state before floating;
FIG. 2 is a view showing the automatic length compensating apparatus of FIG. 1 after floating compensation;
FIG. 3 is a schematic view of a structure of the automatic length compensating apparatus, in a state before use;
FIG. 4 is a schematic view of the structure of FIG. 3 after removal of the process pin;
fig. 5 is a schematic view showing a structure in which the piston body of fig. 3 is in a length compensation limit state;
fig. 6 is a schematic view of the structure of the piston body of fig. 3;
FIG. 7 is a schematic view of the cylinder of FIG. 3;
FIG. 8 is a schematic view of the structure of section A-A of FIG. 5, with two unidirectional locking bolts symmetrically distributed;
FIG. 9 is another schematic view of the structure of section A-A of FIG. 5, with four unidirectional locking bolts symmetrically distributed;
FIG. 10 is a schematic diagram of a second construction of the automatic length compensation device, with both the one-way locking bolt and the two-way locking bolt being inserted into the cylinder;
FIG. 11 is a schematic view of a third construction of an automatic length compensating device, a unidirectional rotation locking construction;
fig. 12 is a schematic view of a fourth construction of the length automatic compensation device, a one-way rolling locking construction.
In the figure: 1-jacking piles; 2-bottom piles; 3-transition piles; 4-a length automatic compensation device; 41-a piston body; 42-cylinder; 43-limit screw; 44-a one-way shaft displacement locking mechanism; 45-rolling elements; 411-mating columns; 412-one-way tongue chute; 413-two-way tongue chute; 414-one-way tongue-and-groove; 415-two-way tongue-and-groove; 416-one-way limit groove; 421-mating bore; 422-one-way locking groove; 423-a bi-directional locking groove; 424-one-way lock slide; 425-two-way lock slide; 426—a rolling slide; 441-one-way locking bolt; 442-two-way bolt; 443-springs; 444-process pins; 445-turning the bolt; 446-process mandrel.
The specific embodiment is as follows:
the following is an example of a specific embodiment of the invention with reference to the accompanying drawings:
example 1: the precast concrete pile with axial length compensation function comprises a top pile 1, a bottom pile 2 and a transition pile 3, wherein the transition pile 3 is arranged between the top pile 1 and the bottom pile 2, an automatic length compensation device 4 is arranged between the bottom pile 2 and the transition pile 3, the automatic length compensation device 4 comprises a piston body 41, a cylinder body 42, a limit screw 43 and a unidirectional shaft displacement locking mechanism 44, the unidirectional shaft displacement locking mechanism 44 is arranged between the piston body 41 and the cylinder body 42, the piston body 41 and the cylinder body 42 are axially and fixedly connected into a whole by the limit screw 43 under the state that the unidirectional shaft displacement locking mechanism 44 is in a forced movement, the cylinder body 42 is fixed on the bottom pile 2, the piston body 41 is fixed on the transition pile 3, the cylinder body 42 is cast and fixed on the bottom pile 2 in an embedded manner, the top plate of the piston body 41 is fixedly connected with the end plate of the transition pile 3 through welding, the length automatic compensation device 4 comprises the piston body 41, a cylinder body 42, a limit screw 43 and a unidirectional shaft displacement locking mechanism 44, the unidirectional shaft displacement locking mechanism 44 is arranged between the piston body 41 and the cylinder body 42, the piston body 41 and the cylinder body 42 are axially and fixedly connected into a whole through the limit screw 43 under the state that the unidirectional shaft displacement locking mechanism 44 is in a state before being forced to move, the unidirectional shaft displacement locking mechanism 44 comprises a unidirectional lock tongue 441, a bidirectional lock tongue 442, a spring 443 and a process pin 444 which are sleeved in the piston body 41, a unidirectional lock groove 422 and a bidirectional lock groove 423 which are arranged on the inner side surface of a matching inner hole 421 of the cylinder body 42, and the unidirectional lock tongue chute 412 and the bidirectional lock tongue 413 are axially arranged along the matching cylinder 411 of the piston body 41; the cylinder body 42 is internally provided with a one-way lock groove 422 and a two-way lock groove 423 along the axial direction, the lower end surface of the one-way lock groove 422 is a plane, the side surface is an arc surface or an inclined surface, the cross section of the two-way lock groove 423 is rectangular, the side surface of the locking end of the one-way lock tongue 441 is an arc surface or an inclined surface, the one-way lock tongue 441 is inserted in the one-way lock tongue sliding groove 412, a spring 443 is arranged between the tail of the one-way lock tongue 441 and the piston body 41, the two-way lock tongue 442 is inserted in the two-way lock tongue sliding groove 413, a spring 443 is arranged between the tail of the two-way lock tongue 442 and the piston body 41, all the one-way lock tongue 441 and the two-way lock tongue 442 are limited in the piston body 41 through the process pin 444, the overhanging ends of all the one-way lock tongue 441 and the two-way lock tongue 442 are contracted in the outer surface of the matched cylinder body 411, and the piston body 41, the two-way lock tongue 442, the spring 443 and the process pin 444 are sleeved in the matched inner hole of the cylinder body 42, and the piston body 41 and the cylinder body 421 are axially fixedly connected by the limit screw 43.
In this example, six unidirectional latch sets and one bidirectional latch set are disposed along the axial interval of the piston body 41, the bidirectional latch sets are located below the unidirectional latch sets, each unidirectional latch set uniformly distributes two unidirectional latches 441 in the circumferential direction of the piston body 41, the bidirectional latch sets uniformly distribute two bidirectional latches 442 in the circumferential direction of the piston body 41, the bidirectional latches 442 are disposed below the unidirectional latches 441, the bidirectional latch sliding grooves 413 are disposed below the unidirectional latch sliding grooves 412, and the number of the unidirectional latch grooves 422 above the bidirectional latch grooves 423 is 0-3.
Example 2: unlike embodiment 1, which is in the structure of the one-way shaft displacement locking mechanism 44, in this example, the one-way shaft displacement locking mechanism 44 adopts the structure as shown in fig. 10, the one-way shaft displacement locking mechanism 44 includes a one-way lock tongue 441, a two-way lock tongue 442, a spring 443 and a process pin 444, a one-way lock tongue groove 414 and a two-way lock tongue groove 415 are axially arranged on a matching cylinder 411 of the piston body 41 at intervals, an upper end face of the one-way lock tongue groove 414 is a plane, a side face is a cambered surface or an inclined surface, a cross section of the two-way lock tongue groove 415 is rectangular, a side face of an overhanging end of the one-way lock tongue 441 is a cambered surface or an inclined surface, a one-way lock tongue 424 and a two-way lock tongue 425 are axially arranged on a side wall of the cylinder 42 at intervals, the one-way lock tongue 441 is inserted in the one-way lock tongue 424, a spring 443 is arranged between a tail of the one-way lock tongue 441 and the cylinder 42, the two-way lock tongue 442 is inserted in the two-way lock tongue 425, a spring 443 is arranged between the tail of the two-way lock tongue 442 and the cylinder 42, all the one-way lock tongue 441 and the two-way lock tongue 442 are limited in the cylinder 42 by the process pin 444, all the one-way lock tongue 441 and the one-way lock tongue 441 is mounted in the cylinder 42, the cambered surface, the side face of the one-way lock tongue 441 is the cylinder body and the piston body 42 is fixed by the limit bolt 41 and the piston body 41. In this solution, the unidirectional latch set includes two unidirectional latches 441 symmetrically distributed along the circumference of the mating inner hole of the cylinder 42, the bidirectional latch set includes two bidirectional latches 442 symmetrically distributed along the circumference of the mating inner hole of the cylinder 42, the bidirectional latches 442 are disposed below the unidirectional latches 441, and the number of the unidirectional latch grooves 414 above the bidirectional latch grooves 415 is 0-3.
Embodiment 3 is different from embodiment 1 in that the one-way shaft shift lock mechanism 44, in this case, the one-way shaft shift lock mechanism 44 adopts a structure as shown in fig. 11, the one-way shaft shift lock mechanism 44 includes a rotary lock tongue 445, a two-way lock tongue 442, a spring 443, a process pin 444, and a process spindle 446, a one-way limit groove 416 and a two-way lock tongue groove 415 are provided on a mating cylinder 411 of the piston body 41 at intervals in the axial direction, an upper end face of the one-way limit groove 416 is a plane, a cross-sectional shape of the two-way lock tongue groove 415 is rectangular, an overhanging end of the rotary lock tongue 445 is a plane, the rotary lock tongue 445 is disposed at intervals in the axial direction of an inner hole side wall of the cylinder 42, a lower end of the rotary lock tongue 445 is hinged with the inner hole side wall of the cylinder 42, a spring 443 is arranged between the upper section of the rotary lock tongue 445 and the cylinder 42, a bidirectional lock chute 425 is horizontally arranged on the cylinder 42, the bidirectional lock chute 425 is arranged above the rotary lock tongue 445, the bidirectional lock tongue 442 is inserted into the bidirectional lock chute 425, the spring 443 is arranged between the tail of the bidirectional lock tongue 442 and the cylinder 42, all the rotary lock tongue 445 is limited in the cylinder 42 through a process mandrel 446, the bidirectional lock tongue 442 is limited in the cylinder 42 through a process pin 444, the rotary lock tongue 445 and the spring 443 are pressed through the process mandrel 446 when the piston body 41 is sleeved, and when the bottom end of the matched cylinder 411 contacts with the bottom surface of the cylinder matched inner hole 421, the piston body 41 is fixedly connected with the cylinder 42 through an axial limit screw 43.
In the above examples, the embodiment of the unidirectional shaft displacement locking mechanism 44 is many, and may be designed as a unidirectional rolling locking mechanism, as shown in fig. 12, a rolling slideway 426 with a slant upper and lower is uniformly arranged on the side wall of the mating section between the mating hole of the cylinder 42 and the piston body 41, and rolling bodies 45 are arranged in the rolling slideway 426.
The unidirectional shaft displacement locking mechanism 44 has many other functionally-replaced structures, for example, a unidirectional wedge locking mechanism or a unidirectional toggle locking mechanism can perform unidirectional compensation function in the length direction on the pile body in the floating process. All solutions for enabling the piston body 41 and the cylinder body 42 to generate an axial unidirectional displacement function between the piston body and the cylinder body in the state of being subjected to opposite tensile forces are included in the protection scope of the present invention.
Example 4: the length automatic compensation device 4 is arranged between the pile 1 and the transition pile 3.
Example 5: the length automatic compensation device 4 is arranged between the transition piles 3.
As one of the special examples of the present invention, the two-section pile of the present invention is composed of a pile top 1, a pile bottom 2 and an automatic length compensating device 4, the automatic length compensating device 4 is arranged between the pile top 1 and the pile bottom 2, a cylinder 42 in the automatic length compensating device 4 is fixed on the pile bottom 2, and a piston body 41 is fixed on the lower end plate of the pile top 1.
As a second special example of the invention, the single-section pile consists of a pile 1 and an automatic length compensating device 4, wherein the automatic length compensating device 4 is arranged below the pile 1, and a piston body 41 in the pile 1 and the automatic length compensating device 4 is fixedly connected with a lower end plate of the pile 1.
The invention is applicable to pile forms including, but not limited to: common pipe piles with various diameters or side lengths and high-strength pipe piles; ordinary solid square piles and high-strength solid square piles; common hollow square-shaped piles, high-strength hollow square piles and the like.
In the above-described embodiment, the manner of fixing the piston body 41 and the cylinder body 42 in the length automatic compensation device 4 to the corresponding connection piles, respectively, is not limited to the limitation of the embodiment.
Claims (9)
1. A concrete precast pile with axial length compensation function is characterized in that: the automatic length compensation device (4) comprises a piston body (41), a cylinder body (42), limit screws (43) and a unidirectional shaft displacement locking mechanism (44), wherein the unidirectional shaft displacement locking mechanism (44) is arranged between the piston body (41) and the cylinder body (42), and the piston body (41) and the cylinder body (42) are axially and fixedly connected into a whole by the limit screws (43) under the state that the unidirectional shaft displacement locking mechanism (44) is in a state before forced movement; when the concrete pile body is a single-section pile, the length automatic compensation device (4) is arranged at the bottom of the concrete pile body, the piston body (41) is fixed on the concrete pile body, and when the concrete pile body is a two-section pile consisting of a top pile (1) and a bottom pile (2), the length automatic compensation device (4) is arranged between the top pile (1) and the bottom pile (2), the cylinder body (42) is fixed on the bottom pile (2), and the piston body (41) is fixed on the top pile (1); when the concrete pile body is a multi-section pile comprising a top pile (1), a bottom pile (2) and a transition pile (3), the length automatic compensation device (4) is arranged between the top pile (1) and the bottom pile (2), the cylinder body (42) is fixed on the bottom pile (2) or the transition pile (3), the piston body (41) is fixed on the transition pile (3) or the top pile (1), the unidirectional shaft displacement locking mechanism (44) comprises a unidirectional spring bolt (441), a bidirectional spring bolt (442), a spring (443), a process pin (444) sleeved in the piston body (41), a unidirectional locking groove (422) and a bidirectional locking groove (423) which are arranged on the inner side face of a matching inner hole (421) of the cylinder body (42), and the unidirectional spring bolt sliding groove (412) and the bidirectional spring bolt sliding groove (413) are axially arranged along the matching cylinder body (411) of the piston body (41); the cylinder body (42) is internally provided with a unidirectional lock groove (422) and a bidirectional lock groove (423) along the axial direction in a matching inner hole (421), the lower end face of the unidirectional lock groove (422) is a plane, the side face is an arc face or an inclined plane, the cross section of the bidirectional lock groove (423) is rectangular, the side face of a lock catch end of the unidirectional lock tongue (441) is an arc face or an inclined plane, the unidirectional lock tongue (441) is inserted in the unidirectional lock tongue chute (412), a spring (443) is arranged between the tail part of the unidirectional lock tongue (441) and the piston body (41), the bidirectional lock tongue (442) is inserted in the bidirectional lock tongue chute (413), a spring (443) is arranged between the tail part of the bidirectional lock tongue (442) and the piston body (41), all the unidirectional lock tongue (441) and the bidirectional lock tongue (442) are limited in the piston body (41) through a process pin (444), the overhanging ends of all the unidirectional lock tongue (441) and the bidirectional lock tongue (442) are contracted in the outer surface of the matching cylinder body (411), and the combination body (41), the spring (443) and the process pin (444) are sleeved in the cylinder body (42) and the axial direction inner hole (41) and are fixedly connected by the axial direction screw (43).
2. A precast concrete pile having an axial length compensation function according to claim 1, characterized in that: the multi-section pile comprises a transition pile (3), wherein the transition pile (3) is arranged between a top pile (1) and a bottom pile (2), a length automatic compensation device (4) is arranged between the bottom pile (2) and the transition pile (3), a cylinder body (42) of the length automatic compensation device (4) is fixed on the bottom pile (2), and a piston body (41) is fixed on the transition pile (3).
3. A precast concrete pile having an axial length compensation function according to claim 1, characterized in that: the multi-section pile comprises more than two transition piles (3), wherein the transition piles (3) are arranged between the top pile (1) and the bottom pile (2) after being connected in series, the length automatic compensation device (4) is arranged between the bottom pile (2) and the transition piles (3), a cylinder body (42) of the length automatic compensation device (4) is fixed on the bottom pile (2), and a piston body (41) is fixed on the transition piles (3); or the length automatic compensation device (4) is arranged between the two transition piles (3), the cylinder body (42) of the length automatic compensation device (4) is fixed on the transition pile (3) below, and the piston body (41) is fixed on the transition pile (3) above.
4. A precast concrete pile having an axial length compensation function according to claim 1, characterized in that: in the unidirectional shaft displacement locking mechanism (44), N unidirectional bolt groups and one bidirectional bolt group are arranged at intervals along the axial direction of the piston body (41), each unidirectional bolt group is uniformly distributed with two or more unidirectional bolts (441) in the circumferential direction of the piston body (41), and the bidirectional bolt groups are uniformly distributed with two or more bidirectional bolts (442) in the circumferential direction of the piston body (41).
5. The precast concrete pile with axial length compensation function according to claim 4, characterized in that: the two unidirectional spring bolt groups are two unidirectional spring bolts (441) which are uniformly distributed along the circumferential direction of the piston body (41), the two bidirectional spring bolt groups are two bidirectional spring bolts (442) which are uniformly distributed along the circumferential direction of the piston body (41), and the bidirectional spring bolts (442) are arranged below the unidirectional spring bolts (441).
6. A precast concrete pile having an axial length compensation function according to claim 1, characterized in that: the bidirectional bolt sliding groove (413) is arranged below the unidirectional bolt sliding groove (412), and the number of the unidirectional bolt sliding grooves (422) above the bidirectional bolt sliding groove (423) is 0-3.
7. A concrete precast pile with axial length compensation function is characterized in that: the automatic length compensation device (4) comprises a piston body (41), a cylinder body (42), limit screws (43) and a unidirectional shaft displacement locking mechanism (44), wherein the unidirectional shaft displacement locking mechanism (44) is arranged between the piston body (41) and the cylinder body (42), and the piston body (41) and the cylinder body (42) are axially and fixedly connected into a whole by the limit screws (43) under the state that the unidirectional shaft displacement locking mechanism (44) is in a state before forced movement; when the concrete pile body is a single-section pile, the length automatic compensation device (4) is arranged at the bottom of the concrete pile body, the piston body (41) is fixed on the concrete pile body, and when the concrete pile body is a two-section pile consisting of a top pile (1) and a bottom pile (2), the length automatic compensation device (4) is arranged between the top pile (1) and the bottom pile (2), the cylinder body (42) is fixed on the bottom pile (2), and the piston body (41) is fixed on the top pile (1); when the concrete pile body is a multi-section pile comprising a top pile (1), a bottom pile (2) and a transition pile (3), a length automatic compensation device (4) is arranged between the top pile (1) and the bottom pile (2), a cylinder body (42) is fixed on the bottom pile (2) or the transition pile (3), a piston body (41) is fixed on the transition pile (3) or the top pile (1), the length automatic compensation device (4) comprises a piston body (41), the cylinder body (42), a limit screw (43) and a one-way shaft displacement locking mechanism (44), the one-way shaft displacement locking mechanism (44) comprises a one-way lock tongue (441), a two-way lock tongue (442), a spring (443) and a process pin (444), a one-way lock tongue groove (414) and a two-way lock tongue groove (415) are axially arranged on a matched cylinder body (411) of the piston body (41) at intervals, the upper end surface of the one-way lock tongue groove (414) is a plane, the side surface or an inclined surface, the cross section of the two-way lock tongue groove (415) is rectangular, the side surface of the one-way lock tongue groove (441) is an end surface or an inclined surface, the one-way lock tongue groove (424) is axially arranged on the one-way lock tongue groove (425) at the one-way lock groove (425) at intervals, a spring (443) is arranged between the tail of the one-way lock tongue (441) and the cylinder body (42), the two-way lock tongue (442) is inserted into the two-way lock sliding groove (425), the spring (443) is arranged between the tail of the two-way lock tongue (442) and the cylinder body (42), all the one-way lock tongue (441) and the two-way lock tongue (442) are arranged in the cylinder body (42) in a limiting mode through a process pin (444), locking ends of all the one-way lock tongue (441) and the two-way lock tongue (442) are contracted into the inner hole surface of the cylinder body (42), and before the piston body (41) is sleeved on the matching inner hole (421) of the cylinder body (42), the piston body (41) is fixedly connected with the cylinder body (42) through an axial limit screw (43).
8. A concrete precast pile with axial length compensation function is characterized in that: the automatic length compensation device (4) comprises a piston body (41), a cylinder body (42), limit screws (43) and a unidirectional shaft displacement locking mechanism (44), wherein the unidirectional shaft displacement locking mechanism (44) is arranged between the piston body (41) and the cylinder body (42), and the piston body (41) and the cylinder body (42) are axially and fixedly connected into a whole by the limit screws (43) under the state that the unidirectional shaft displacement locking mechanism (44) is in a state before forced movement; when the concrete pile body is a single-section pile, the length automatic compensation device (4) is arranged at the bottom of the concrete pile body, the piston body (41) is fixed on the concrete pile body, and when the concrete pile body is a two-section pile consisting of a top pile (1) and a bottom pile (2), the length automatic compensation device (4) is arranged between the top pile (1) and the bottom pile (2), the cylinder body (42) is fixed on the bottom pile (2), and the piston body (41) is fixed on the top pile (1); when the concrete pile body is a multi-section pile comprising a top pile (1), a bottom pile (2) and a transition pile (3), a length automatic compensation device (4) is arranged between the top pile (1) and the bottom pile (2), a cylinder body (42) is fixed on the bottom pile (2) or the transition pile (3), a piston body (41) is fixed on the transition pile (3) or the top pile (1), the length automatic compensation device (4) comprises a piston body (41), a cylinder body (42), a limit screw (43) and a one-way shaft displacement locking mechanism (44), the one-way shaft displacement locking mechanism (44) comprises a rotary lock tongue (445), a two-way lock tongue (442), a spring (443), a process pin (444) and a process mandrel (446), a one-way limit groove (416) and a two-way lock tongue groove (415) are axially arranged on a matched cylinder body (411) of the piston body (41) at intervals, the upper end surface of the one-way limit groove (416) is a plane, the cross-section of the two-way lock tongue groove (415) is a rectangle, the overhanging end of the rotary lock tongue (445) is a plane, the rotary lock tongue (445) is axially arranged along the lower end of the cylinder body (42) and is axially connected with the upper end of the inner hole (443) of the lock tongue (42), the cylinder body (42) is horizontally provided with a bidirectional lock chute (425), the bidirectional lock chute (425) is arranged above the rotary lock tongue (445), the bidirectional lock tongue (442) is inserted into the bidirectional lock chute (425), a spring (443) is arranged between the tail part of the bidirectional lock tongue (442) and the cylinder body (42), all the rotary lock tongue (445) are limited in the cylinder body (42) through a process mandrel (446), the bidirectional lock tongue (442) is limited in the cylinder body (42) through the process mandrel (444), the rotary lock tongue (445) and the spring (443) are pressed through the process mandrel (446) when the piston body (41) is sleeved, and when the bottom end of the matched cylinder body (411) is contacted with the bottom surface of the matched inner hole (421) of the cylinder body, the piston body (41) and the cylinder body (42) are fixedly connected through an axial limit screw (43).
9. A precast concrete pile having an axial length compensation function according to claim 8, characterized in that: the unidirectional shaft displacement locking mechanism (44) is a unidirectional rolling locking mechanism, the side wall of a matching section between a matching hole of the cylinder body (42) and the piston body (41) is uniformly provided with a rolling slideway (426) which is inclined and is high and low, and rolling bodies (45) are arranged in the rolling slideway (426).
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB440140A (en) * | 1934-11-05 | 1935-12-20 | Josef Wohlmeyer | Improvements in and relating to apparatus for driving or withdrawing piles, stakes, or the like |
| US6390734B1 (en) * | 2001-01-04 | 2002-05-21 | Frederick S. Marshall | Method and apparatus for anchoring a piling to a slab foundation |
| CN106812137A (en) * | 2017-03-06 | 2017-06-09 | 广州市第三建筑工程有限公司 | A kind of quick pile extension device, prefabricated pile and preparation method thereof and pile extension method |
| CN210066720U (en) * | 2019-01-18 | 2020-02-14 | 吴洪林 | Concrete precast pile with axial length compensation function |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113322946B (en) * | 2021-06-09 | 2022-01-04 | 浙大城市学院 | Combined pile for foundation engineering |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB440140A (en) * | 1934-11-05 | 1935-12-20 | Josef Wohlmeyer | Improvements in and relating to apparatus for driving or withdrawing piles, stakes, or the like |
| US6390734B1 (en) * | 2001-01-04 | 2002-05-21 | Frederick S. Marshall | Method and apparatus for anchoring a piling to a slab foundation |
| CN106812137A (en) * | 2017-03-06 | 2017-06-09 | 广州市第三建筑工程有限公司 | A kind of quick pile extension device, prefabricated pile and preparation method thereof and pile extension method |
| CN210066720U (en) * | 2019-01-18 | 2020-02-14 | 吴洪林 | Concrete precast pile with axial length compensation function |
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