CN216515754U

CN216515754U - Anti-freeze-drawing club-footed pile structure

Info

Publication number: CN216515754U
Application number: CN202122980744.2U
Authority: CN
Inventors: 常丹; 闫一辉; 刘建坤; 封力贞
Original assignee: Sun Yat Sen University
Current assignee: Sun Yat Sen University
Priority date: 2021-11-30
Filing date: 2021-11-30
Publication date: 2022-05-13
Anticipated expiration: 2031-11-30

Abstract

The utility model relates to the technical field of towers and discloses an anti-freezing-pulling club-footed pile structure which comprises a framework upright post, an umbrella rib structure and a sliding block, wherein the top end of the framework upright post is used for being connected with the pile post, the sliding block is axially and movably sleeved on the framework upright post, the umbrella rib structure comprises a supporting rod and a connecting rod, the bottom end of the supporting rod is rotatably assembled on the framework upright post, the connecting rod is connected between each supporting rod and the sliding block, one end of the connecting rod is hinged with the supporting rod, and the other end of the connecting rod is hinged with the sliding block. When a pole and tower foundation is built in a frozen soil layer, a constructor arranges the anti-freezing bottom pillar structure at the bottom of a pile hole, the rib structures are embedded into the soil body to play a role of pre-embedding ribs, and when the pile foundation is influenced by the action of a freezing and pulling force, the rib structures and the framework stand columns can provide downward anti-pulling force to weaken the freezing and pulling phenomenon; the method has the advantages of low requirement on production process, convenience for flow line batch production, low manufacturing cost, low construction difficulty and simplified construction.

Description

Anti-freeze-drawing club-footed pile structure

Technical Field

The utility model relates to the technical field of towers, in particular to a frost-resistant pedestal pile structure.

Background

With the development of economy in China, infrastructure construction in China is developed in large areas in frozen soil areas in China, main linear engineering in the areas is researched, and the problem that tower foundations in the frozen soil areas have serious frozen-out is found. Under the negative temperature in winter, the soil body takes place the frost heaving, and the upward tangential frost heaving power that produces is acted on the shaft tower to shaft tower foundation side direction frost heaving, and when the friction sum that produces between the dead weight of shaft tower basis and shaft tower and the soil body was not enough to balance the tangential frost heaving power between soil and the shaft tower basis, the shaft tower upwards pulled up, along with the lapse of time, the increase of freeze-thaw cycle number of times, the shaft tower basis can take place the slope even to influence the normal use of shaft tower, this kind of phenomenon we call the freeze-pull phenomenon.

The tower foundation in the frozen soil area is located in a permafrost layer and a seasonal active layer, the bottom surface and the side surface of the foundation directly act with a soil body, and unequal displacement of the tower in the frost heaving and thawing sinking process of the soil body is the key for the problem that the tower foundation is frozen and pulled out. The huge freezing and pulling effect causes the problems of upward pulling of the tower, breakage of the stay wire, and inclination and even overturn when the stay wire is not uniformly stressed, greatly influences the safety of linear engineering, causes the phenomena of inclination and even collapse, can cause major safety accidents of a power network and a communication network, and brings major economic loss to the country

The existing anti-freezing and anti-pulling technology mainly comprises the following steps that firstly, the mode of a pile body is changed, such as the mode of a pile end is changed, a cylindrical pile end is changed into a conical pile end or a plurality of embedded steel bars are preset at the pile end, and the contact area between the pile end and a soil body is increased, so that the anti-pulling counter force is increased, the pulling-up of a pile body is reduced, and the freezing and pulling phenomena are weakened; secondly, methods such as heating the periphery of the pile body and the like are adopted, so that the soil body around the pile body is prevented from being below negative temperature, the water volume expansion in the peripheral soil body is reduced, the frost heaving phenomenon of the soil body around the pile body is further solved, and the frost heaving phenomenon of the pile foundation is further solved; thirdly, weaken the influence of frozen-drawing effect to the pile foundation through adding the mechanism to the pile body, increase the resistance to plucking of pile body to the installation anchor outside the pile body, or to the slide rail device of the pile body outside installation and the inseparable laminating of pile body to replace the pile body to bear most frozen-drawing power, weaken the frozen-drawing effect of pile body through at the installation device of pile body outside.

However, the above-mentioned anti-freezing-pulling method has respective disadvantages, such as changing the pile body form to increase the contact area between the pile body and the soil is effective and feasible in principle, but the special-shaped pile body is inconvenient for flow line production, the production process is not mature, and more manpower and material resources are required to be invested than the common precast pile for producing the special-shaped pile, so that the production cost is greatly increased, the economic requirement cannot be met, the popularization is difficult, and the practicability is poor; and the construction process of the special-shaped pile is not mature in the construction process, the construction difficulty is higher, and the special-shaped pile is easy to break due to the stress concentration phenomenon at the position where the section of the pile body is changed greatly in the piling process, so that the construction difficulty and the economic cost are increased.

By heating the soil body around the pile body, the soil body is heated, the soil body is prevented from being frozen, the problem of freezing and pulling of the soil body can be solved fundamentally, a large amount of energy sources are consumed for heating the surrounding soil body, and the concept of environmental protection is not met. In addition, peripheral soil bodies are insufficiently heated, a small amount of freezing and pulling displacement can still be generated, pole tower foundation inclination can still occur through the action of freeze-thaw cycles of the aged, but a large amount of power resources are input, and the economic requirement cannot be met. If peripheral soil body overheat, not only can consume too much electric power resource, still can cause great destruction to the frozen soil in original area, easily cause the foundation basis unstable, the foundation basis takes place great settlement, is not conform to the design principle of protection many years frozen soil, is unfavorable for the permanent use of structure, can influence security, the suitability of structure. How to heat the surrounding soil body has not been supported by related theories, and the soil body is difficult to be heated properly.

Through increase anchor device or increase the device in the outside and replace the pile body to undertake most freeze and pull out power in the pile body outside the pile body, this kind of mode is feasible but tests higher to construction technique, and the construction degree of difficulty increases. In addition, the concrete pile needs to be coagulated and hardened for a certain time, so that the final production time of the whole device is longer, the whole device is not suitable for assembly line construction, the production cost is increased, the device is difficult to construct, the structure is complex, and the device is not suitable for popularization and use.

SUMMERY OF THE UTILITY MODEL

The purpose of the utility model is: the anti-freeze-drawing pedestal pile structure is convenient for flow line batch production, reduces the manufacturing cost and simplifies the construction.

In order to achieve the aim, the utility model provides a frost-uplift club-footed pile structure, which comprises a framework upright post, an umbrella rib structure and a sliding block, the top end of the framework upright post is used for being connected with the pile post, the sliding block is axially and movably sleeved on the framework upright post, the umbrella rib structure comprises a support rod and a connecting rod, the support rod and the connecting rod are arranged at intervals along the circumferential direction of the framework upright post, the bottom ends of the support rods are rotatably assembled on the framework upright posts, the connecting rods are connected between the support rods and the sliding blocks, one end of the connecting rod is hinged to the supporting rod, the other end of the connecting rod is hinged to the sliding block, and the sliding block drives the umbrella rib structure to expand to be connected with frozen soil and drives the umbrella rib structure to tighten up in the stroke of axial movement on the framework stand column.

Preferably, four groups of umbrella rib structures are arranged at intervals along the circumferential direction of the framework upright post, and the four groups of umbrella rib structures are distributed in a cross shape.

Preferably, still include removable suit the slip sleeve on the skeleton stand, the slip sleeve is used for the drive the sliding block in slide on the skeleton stand.

Preferably, the bottom end of the framework upright post is provided with an insertion end used for inserting a permafrost layer.

Compared with the prior art, the anti-freeze-drawing club-footed pile structure provided by the embodiment of the utility model has the beneficial effects that: the anti-freezing bottom pillar structure is arranged at the bottom of a pile hole by a constructor when a tower foundation is built in a frozen soil layer, the sliding block moves to an unfolding position to enable the rib structure to be in an unfolding state, a vertical or nearly vertical state is formed between the supporting rod and the framework stand column, the top end of the framework stand column is connected with the pile column, the rib structure is embedded into a soil body to play a role of pre-embedding ribs, when the pile column foundation is influenced by the action of freezing and pulling force, the rib structure and the framework stand column can provide downward anti-pulling force to weaken the freezing and pulling phenomenon, meanwhile, overlarge settlement or deviation of the pile column foundation can be prevented, and the foundation is stable; skeleton stand, rib structure and sliding block all can adopt the steel material, and is lower to production technology's requirement, the assembly line batch production of being convenient for, low in manufacturing cost, and rib structure and pile foundation need not to carry out the prefabrication and assemble or be connected, can implement on original ripe construction technology basis, and the construction degree of difficulty is less, simplifies the construction.

Drawings

FIG. 1 is a schematic structural view of a freeze resistant reamed pile construction of the present invention;

FIG. 2 is a schematic structural view of the freeze-drawn club-footed pile structure of FIG. 1 in a tightened state through the steel casing;

FIG. 3 is a schematic structural view of the freeze resistant reamed club-footed pile structure of FIG. 2 in a deployed state after it has been passed through the steel casing;

fig. 4 is a schematic view of an installation position of the anti-freeze reaming pile structure of fig. 1.

In the figure, 1, a framework upright post; 2. a slider; 3. an umbrella frame structure; 31. a support bar; 32. a connecting rod; 4. a sliding sleeve; 5. steel casing; 6. pile holes; 7. a soil filling interface; 8. a lateral space; 9. a seasonal frozen soil layer; 10. frozen soil layer for many years.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

According to the preferred embodiment of the anti-freeze-drawing club-footed pile structure disclosed by the utility model, as shown in fig. 1 to 4, the anti-freeze-drawing club-footed pile structure comprises the framework upright post 1, the umbrella rib structures 3 and the sliding block 2, wherein the framework upright post 1, the umbrella rib structures 3 and the sliding block 2 are all made of steel materials, the production process requirement is lower, the mass production and construction in a production line are facilitated, the manufacturing cost is reduced, and the economy is good.

The top end of the framework upright post 1 is used for being connected with a pile, the pile is of a concrete structure, and the concrete is rigidly connected with the top end of the framework upright post 1 when the concrete is poured. During construction, the anti-freezing-pulling club-footed pile structure and the pile foundation do not need to be preassembled or connected, the construction can be carried out on the basis of the original mature construction process, the construction difficulty is small, the connection difficulty between the steel structure and the pile foundation is low, and construction is facilitated.

The sliding block 2 is axially movably sleeved on the framework upright post 1, and the sliding block 2 can be lifted and moved on the framework upright post 1 to drive the umbrella rib structure 3 to act. The umbrella rib structure 3 includes bracing piece 31 and connecting rod 32, and bracing piece 31 and connecting rod 32 have a multiunit along the circumference interval arrangement of skeleton stand 1, and the bottom of bracing piece 31 is rotated and is assembled on skeleton stand 1, and the axis of rotation perpendicular to skeleton stand 1 of bracing piece 31 promptly, bracing piece 31 can tighten up and expand when rotating.

All be connected with connecting rod 32 between each bracing piece 31 and the sliding block 2, the one end of connecting rod 32 is articulated with bracing piece 31, the other end is articulated with sliding block 2, and the articulated shaft at connecting rod 32 both ends is on a parallel with the articulated shaft of bracing piece 31. The sliding block 2 has an expansion position for driving the umbrella rib structure 3 to expand to be connected with frozen soil and a tightening position for driving the umbrella rib structure 3 to tighten in the stroke of axial movement on the framework upright post 1. When the sliding block 2 moves downwards, the sliding block 2 drives the supporting rod 31 to unfold through the connecting rod 32, and when the sliding block 2 moves upwards, the sliding block 2 drives the supporting rod 31 to contract through the connecting rod 32.

When sliding block 2 removes to expansion position messenger rib structure 3 and is in the state of expanding, form perpendicular or be close the vertically state between bracing piece 31 and the skeleton stand 1, the top and the stake of skeleton stand 1 are connected, the effect of pre-buried muscle has been played in the rib structure 3 embedding soil body, when the stake basis receives the effect influence of frozen-out force, rib structure 3 and skeleton stand 1 can provide decurrent anti-floating force, weaken the phenomenon of frozen-out, can also prevent that the stake basis from producing too big settlement or skew simultaneously, be favorable to the stability of basis.

Preferably, the rib structures 3 are arranged in four groups at intervals along the circumferential direction of the frame upright post 1, and the four groups of rib structures 3 are distributed in a cross shape. The four groups of umbrella frame structures 3 can apply anti-freezing pulling acting force on the pile foundation in four directions, so that the anti-freezing pulling effect is improved; meanwhile, the acting forces in four directions can ensure the stress balance of the pile foundation, and the pile foundation can be prevented from generating excessive settlement or deviation, so that the stability of the foundation is better facilitated.

Preferably, the sliding device further comprises a sliding sleeve 4 detachably sleeved on the framework upright post 1, wherein the sliding sleeve 4 is used for driving the sliding block 2 to slide on the framework upright post 1. Sliding block 2 relies on gravity to drive rib structure 3 and expandes, but receives frictional resistance's influence, and rib structure 3 can not all expand, and when sliding sleeve 4 slided on skeleton stand 1, bottom roof pressure sliding block 2 moved down and promoted sliding block 2 to guarantee that rib structure 3 expandes completely.

Preferably, the bottom end of the framework upright 1 has an insertion end for inserting a permafrost layer. The permafrost layer frozen soil can not melt and is more stable. After the bottom of skeleton stand 1 inserted into permafrost layer, can increase skeleton stand 1's stability, guarantee the vertical extension of skeleton stand 1, it is the same with the effect direction of frozen power, avoid roll-over between skeleton stand 1 and the pile foundation.

As shown in fig. 1 to 4, the construction method of the anti-freeze-extraction club-footed pile structure comprises the following steps of firstly, digging pile holes 6 in a permafrost layer to a preset soil filling interface 7, and transversely digging lateral spaces 8 for unfolding the umbrella rib structures 3 in a soil body at the bottom of the soil filling interface 7; the umbrella rib structure 3 occupies a large space after being unfolded, and the lateral space 8 is arranged to facilitate the unfolding of the umbrella rib structure 3 and prevent the interference of the umbrella rib structure 3 and a soil layer.

The frozen soil layer comprises a seasonal frozen soil layer 9 and a perennial frozen soil layer 10, the perennial frozen soil layer 10 is positioned below the seasonal frozen soil layer 9, and the soil filling interface 7 is positioned in the perennial frozen soil layer 10.

Secondly, a destructible structure is adopted to connect the sliding block 2 and the framework upright post 1, so that the sliding block 2 is in a tightening position, and the anti-freeze-drawing club-footed pile structure with the umbrella rib structure 3 in a tightening state is conveyed to the bottom of the pile hole 6; the destructible structure can fix the position of the sliding block 2, so that the sliding block 2 is positioned at the upper side of the framework upright post 1, and the umbrella rib structure 3 is ensured to be in a tightened state to pass through the pile hole 6; meanwhile, when the anti-freeze-drawing club-footed pile structure is conveyed to the bottom of the pile hole 6, the sliding block 2 moves to the unfolding position under the action of gravity after a constructor destroys the destructible structure so as to drive the umbrella rib structure 3 to be in the unfolding state.

Step three, inserting the bottom end of the framework upright post 1 into the permafrost layer, destroying the destructible structure in the step two, disconnecting the sliding block 2 from the framework upright post 1, moving the sliding block 2 downwards under the action of gravity of the umbrella rib structure 3, and transversely unfolding the umbrella rib structure 3 in the lateral space 8 in the step one; the bottom of skeleton stand 1 is for inserting the end, inserts the stability that can increase skeleton stand 1 after the end inserts in the permafrost layer, guarantees that skeleton stand 1 is in vertical state, prevents the skew of pile foundation.

Fourthly, backfilling soil bodies into the pile holes 6 to the soil filling interface 7 in the first step, wherein the top ends of the framework upright posts 1 are positioned on the upper side of the soil filling interface 7; in the bracing piece 31, the connecting rod 32 embedding backfill soil of rib structure 3 behind the backfill soil body, the backfill soil body forms frozen soil in frozen soil layer, rib structure 3 has played the effect of pre-buried muscle, can provide freeze proof pull out power, prevents that the device basis from producing too big settlement or skew, is favorable to basic stability.

And fifthly, pouring concrete into the pile hole 6, and rigidly connecting the concrete with the top end of the framework upright post 1. Rigid connection is formed with the top of skeleton stand 1 after the concrete pouring, makes this frost-resistant pulling club-footed pile structure and pile foundation need not to prefabricate and assembles or be connected, and the connection degree of difficulty is low between steel construction and the pile foundation, can implement on original ripe construction process basis, and the construction degree of difficulty is less, the construction of being convenient for.

Preferably, in the first step, the pile hole 6 is drilled by adopting an earth excavation hole forming technology, the steel sleeve 5 is driven into the earth by adopting a hammering or vibrating mode, the earth body is excavated in the range of the steel sleeve 5 from the earth surface to form the pile hole 6, and in the sixth step, the steel sleeve 5 is pulled out to form the pile after the concrete is poured. The inner diameter of the steel sleeve 5 is larger than the radial space occupied by the umbrella rib structure 3 in the tightened state, the frost-resistant pile pulling-out structure is ensured to enter the pile hole 6, the steel sleeve 5 can limit the size and the range of the pile hole 6, the influence on the periphery is small, and the construction technology is mature.

The main construction technology of the pile column is the immersed tube cast-in-place pile, the construction technology is mature, the problem that a foundation pit is excavated by adopting machines such as an excavator in the common technology in the construction brought by the special-shaped pile can be avoided, the construction time is shortened, the construction is convenient, the construction cost is reduced, and the construction efficiency can be improved.

In construction, the utility model has small operation radius, low interference and damage degree to underground permafrost, has positive effect on circulation stability of the permafrost region, accords with the design principle of protecting the permafrost and is beneficial to long-term effect of the structure.

Preferably, in step one, a lateral space 8 is formed in the bottom soil body of the soil filling interface 7 by means of manual lateral excavation or explosive excavation. Mechanical construction in the frozen soil layer is inconvenient, and the construction efficiency can be ensured by adopting a mode of manual excavation or explosive excavation.

Preferably, in step two, the breakable structure is a rope. The cost of the rope is low, the mode of damaging the rope is simple, and the construction is convenient.

Preferably, in the third step, the sliding sleeve 4 is sleeved on the framework upright post 1, the bottom end of the sliding sleeve 4 pushes the sliding block 2 to move downwards, so that the umbrella rib structure 3 is completely unfolded, and before backfilling in the fourth step, the sliding sleeve 4 is taken out. The sliding sleeve 4 can ensure that the umbrella rib structure 3 is completely unfolded, increase the contact area between the umbrella rib structure 3 and the frozen soil layer and increase the anti-freezing pulling force.

Preferably, in the fourth step, soil body compaction is carried out in the process of backfilling the soil. The soil body is compacted in the process of backfilling soil, the acting force between the rib structures 3 and the frozen soil layer can be guaranteed, the framework upright posts 1 are checked after the backfilling is finished, and the top ends of the framework upright posts 1 are partially located on the upper portions of the backfilling interface 7 and are rigidly connected with the poured concrete, so that the construction is completed.

The utility model adds a structure of the anti-freeze-drawing pedestal pile at the bottom of the concrete pile without changing the pile foundation of the original design. When the soil body takes place freeze thawing cycle, produce tangential frost heaving force to the pile body, when tangential frost heaving force developed to be greater than between pile body dead weight and the pile soil frictional force, the pile body produced and pulled out, nevertheless because rigid connection between frost-resistant frame column 1 who pulls out club-footed pile structure and the pile body, just can lead to rib structure 3 and both sides soil body to take place the interact, make resistance increase, weaken through this kind of mode and freeze the influence of pulling out the effect to the pile foundation, make the security and the durability of pile foundation can further promote, in order to reach the prevention and cure effect of linear engineering freeze-pulling disease.

To sum up, the embodiment of the utility model provides a frost-resistant pile-expanding structure, wherein a plurality of groups of rib structures are circumferentially arranged on a framework upright post, when a tower foundation is built in a frozen soil layer, a constructor arranges the frost-resistant pile-expanding structure at the bottom of a pile hole, a sliding block moves to an expansion position to enable the rib structures to be in an expansion state, a vertical or nearly vertical state is formed between a supporting rod and the framework upright post, the top end of the framework upright post is connected with the pile post, the rib structures are embedded into a soil body to play a role of pre-embedding ribs, and when the pile foundation is influenced by the action of a frost-pulling force, the rib structures and the framework upright post can provide downward uplift resistance to weaken the frost-pulling phenomenon, and meanwhile, the pile foundation can be prevented from generating excessive settlement or deviation, and the stability of the foundation is facilitated; skeleton stand, rib structure and sliding block all can adopt the steel material, and is lower to production technology's requirement, the assembly line batch production of being convenient for, low in manufacturing cost, and rib structure and pile foundation need not to carry out the prefabrication and assemble or be connected, can implement on original ripe construction technology basis, and the construction degree of difficulty is less, simplifies the construction.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a frost-resistant pulls out club-footed pile structure, its characterized in that, includes skeleton stand, rib structure and sliding block, the top of skeleton stand is used for being connected with the stake, sliding block axial activity suit is in on the skeleton stand, rib structure includes bracing piece and connecting rod, the bracing piece and the connecting rod is followed the circumference interval arrangement of skeleton stand has the multiunit, the bottom of bracing piece is rotated the assembly and is in on the skeleton stand, each the bracing piece with all be connected with between the sliding block the connecting rod, the one end of connecting rod with the bracing piece is articulated, the other end with the sliding block is articulated, the sliding block is in the drive has in the stroke of axial displacement on the skeleton stand rib structure expandes with the expansion position and the drive of being connected with frozen soil the receipts tight position that rib structure tightened up.

2. The anti-freeze-extraction club-footed pile structure of claim 1, wherein the rib structures are arranged in four groups at intervals along the circumference of the frame upright post, the four groups of rib structures being distributed in a cross shape.

3. The anti-freeze-extraction club-footed pile structure of claim 1, further comprising a sliding sleeve which can be detachably sleeved on the framework upright post, wherein the sliding sleeve is used for driving the sliding block to slide on the framework upright post.

4. The anti-freeze drawn club-footed pile structure of claim 1, wherein the bottom ends of the skeleton posts have insertion tips for inserting into a permafrost layer.