CN110453697B - Anti-slide pile structure with multi-region combined drainage function and construction method thereof - Google Patents
Anti-slide pile structure with multi-region combined drainage function and construction method thereof Download PDFInfo
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Abstract
The invention discloses an anti-slide pile structure with a multi-zone combined drainage function and a construction method thereof. The slide-resistant pile comprises a lower pile bottom structure, an upper pile body structure and a reinforcement cage whole body; connecting the lower pile bottom structure and the upper pile body structure into a whole through the whole reinforcement cage by adopting a pouring method; the whole reinforcement cage comprises an inner round reinforcement cage and an outer square reinforcement cage from inside to outside; connecting the internal round reinforcement cage and the external square reinforcement cage into a reinforcement cage whole through connecting reinforcements; the upper pile body structure comprises an upper cross-shaped pile core, an upper square pile wall, an inclined water collecting hole and a right-angled fan-shaped water storage space; the lower pile bottom structure comprises a lower square pile bottom and a drain hole. The anti-slide pile is simple in structure, can be prefabricated and cast in place, and has obvious effects of effectively improving the bending resistance and the shearing resistance of the slope and the drainage performance and enhancing the safety and the stability of the slope.
Description
Technical Field
The invention belongs to the technical field of geological disaster prevention and control, and particularly relates to an anti-slide pile structure with a multi-region combined drainage function and a construction method thereof, which are particularly suitable for slope engineering and landslide management engineering in areas with frequent rainfall and high landslide disaster.
Background
Landslide is a geological disaster seriously harming the world, and rainfall, ice and snow melting, reservoir water lifting and the like are one of the most main external factors inducing the landslide disaster. With the increasing frequency of human engineering activities, landslide geological disasters are more and more frequent, and the loss caused by landslide geological disasters is larger and larger. In landslide prevention engineering, the slide-resistant pile is one of the most common engineering measures for landslide control. The main function of the anti-slide pile is to drive the anti-slide pile into the landslide, thereby stabilizing it on the inner layer of the landslide mass. The anti-slide pile enters the stable layer of the landslide body, so that the flow force of the landslide body can be effectively blocked, and the stability of the landslide body is greatly improved. When encountering landslide, the sliding body slides downwards, and at the moment, if the sliding body is internally provided with the anti-slide pile, the occurrence of the landslide can be effectively prevented, so that the importance of the anti-slide pile can be seen.
The square anti-slide pile has the advantages of simple structure, convenience in construction, good integrity, high bearing capacity, strong impact resistance, low breakage rate in the construction process, high bending resistance and shearing resistance and the like, and is multipurpose in actual engineering of landslide prevention and control. Although there are many drainage slide-resistant piles which improve the drainage effect at present, they have the defects of complicated construction steps, poor integrity, poor drainage performance or limited functionality and the like. The application number 201811332042.X discloses a deformation self-adaptive drainage anti-slide pile for an expansive soil slope and a construction method, wherein elastic sections of the pile are connected through springs, the integrity is poor, and the bending resistance and the shearing resistance are reduced. In addition, compared with a square pile, the round pile has smaller bearing capacity and low impact resistance; and the traditional siphon drainage technology is adopted, so that the slope drainage is realized, and the effect is relatively single.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide an anti-slide pile structure with a multi-zone combined drainage function and a construction method thereof.
The technical scheme for solving the technical problem of the slide-resistant pile is to provide a slide-resistant pile structure with a multi-region combined drainage function, wherein the slide-resistant pile comprises a lower pile bottom structure, an upper pile body structure and a reinforcement cage whole body; the method is characterized in that a pouring method is adopted to integrally connect a lower pile bottom structure and an upper pile body structure through a reinforcement cage;
the whole reinforcement cage comprises an inner round reinforcement cage and an outer square reinforcement cage from inside to outside; connecting the internal round reinforcement cage and the external square reinforcement cage into a reinforcement cage whole through connecting reinforcements;
the upper pile body structure comprises an upper cross-shaped pile core, an upper square pile wall, an inclined water collecting hole and a right-angled fan-shaped water storage space; the lower pile bottom structure comprises a lower square pile bottom and a drain hole;
the upper cross-shaped pile core and the upper square pile wall are integrally formed through pouring; the upper part of an internal circular reinforcement cage is arranged in the upper cross-shaped pile core; the upper part of an external square reinforcement cage is arranged in the upper square pile wall; a right-angled fan-shaped water storage space is formed between the upper cross-shaped pile core and the upper square pile wall; broken stones are filled in the right-angle fan-shaped water storage space; a plurality of communicated inclined water collecting holes are formed in the upper square pile wall; one end of the inclined water collecting hole is communicated with the right-angled fan-shaped water storage space; gravel is filled in the inclined water collecting holes;
the lower part of the whole reinforcement cage is arranged in the lower square pile bottom; a plurality of through drain holes are formed in the bottom of the lower square pile; a permeable cushion layer is laid on the top of one end of the drain hole and is communicated with the right-angled fan-shaped water storage space.
The technical scheme for solving the technical problem of the construction method is to provide a construction method of an anti-slide pile structure with a multi-zone combined drainage function, and the construction method is characterized by comprising the following steps:
1) analyzing and determining the number, size and installation position of the slide-resistant piles and the depth of pile holes;
2) manufacturing an external square reinforcement cage and an internal round reinforcement cage; then, the internal round reinforcement cage is arranged in the external square reinforcement cage and welded to form a reinforcement cage whole;
3) prefabricating a square pile body outer template according to the size of the section of the pile body; manufacturing a water storage space template according to the shape and the size of the right-angled fan-shaped water storage space;
4) excavating a pile hole to the inside of the bedrock, and ensuring that the section size of the pile hole is larger than that of the slide-resistant pile;
5) putting the whole reinforcement cage obtained in the step 2) into an excavated pile hole, then sleeving a square pile body outer template on the outer side of the whole reinforcement cage, pouring concrete into the square pile body outer template until the height h of the lower square pile bottom is reached, and reserving a drain hole; obtaining a lower pile bottom structure after the concrete is solidified;
6) installing a water storage space template, and pouring concrete; removing the water storage space template and the square pile body outer template after the concrete is solidified to form an upper pile body structure, and reserving inclined water collecting holes;
7) paving a water permeable cushion layer on the top of the water drainage hole, then sequentially filling fine sand, medium coarse sand and gravel into the right-angled fan-shaped water storage space from bottom to top, and filling gravel into the inclined water collection hole;
8) and backfilling the space between the pile body and the pile hole of the anti-slide pile, and paving clay on the pile top of the anti-slide pile after tamping.
A construction method of a prefabricated slide-resistant pile structure with a multi-zone combined drainage function is characterized by comprising the following steps:
1) analyzing and determining the number, size and installation position of the slide-resistant piles and the depth of pile holes;
2) excavating a pile hole to the inside of the bedrock, and ensuring that the section size of the pile hole is larger than that of the slide-resistant pile;
3) prefabricating the anti-slide pile: prefabricating the anti-slide pile according to the design requirement;
4) and (3) constructing the prefabricated slide-resistant pile: hoisting the prefabricated slide-resistant pile, aligning the prefabricated slide-resistant pile with the pile hole, adjusting the verticality of the prefabricated slide-resistant pile, and then putting the prefabricated slide-resistant pile into the pile hole to a designed elevation;
5) paving a water permeable cushion layer on the top of the water drainage hole, then sequentially filling fine sand, medium coarse sand and gravel into the right-angled fan-shaped water storage space from bottom to top, and filling gravel into the inclined water collection hole;
6) and backfilling the space between the pile body and the pile hole of the anti-slide pile, and paving clay on the pile top of the anti-slide pile after tamping.
Compared with the prior art, the invention has the beneficial effects that:
1. this slide-resistant pile has higher bending resistance and shear resistance: the pile body is integrally connected into a whole by adopting an integral pouring method through the whole reinforcement cage, so that the integrity of the slide-resistant pile is improved, and the pile body is ensured to have higher bending resistance and shearing resistance.
2. This slide-resistant pile possesses good drainage function: the disadvantage of relatively single action caused by abandoning the traditional siphon drainage technology is overcome. The inclined water collecting hole channel designed by the anti-slide pile can enable water in a slope body to flow into the pile more easily, the arranged right-angle fan-shaped water storage space has the characteristic of strong water collecting capacity, and the arranged water drainage hole channel extends into bedrock to discharge water in real time. Water flowing into the right-angled fan-shaped water storage space through the inclined water collecting holes is discharged through the water discharging holes, and the inclined water collecting holes, the right-angled fan-shaped water storage space and the water discharging holes form a complete water discharging system, so that the water discharging efficiency of the anti-slide pile is improved.
3. The pile structure (namely the square pile) with the square pile body section is adopted, the theoretically calculated shearing resistance is 2-3 times of that of the equivalent tubular pile, the shearing resistance of the slide-resistant pile is greatly improved, meanwhile, the pile body bearing capacity of the square pile is equivalent to that of a thick-wall tubular pile with the outer diameter of 500, and the bearing capacity of the slide-resistant pile is improved; in addition, the construction process has low breakage rate and strong shock resistance, a non-welded quick connector is easy to develop, the construction is convenient and quick, and the phenomenon of cracking of a welding pile head in a high underground water level can be avoided.
4. The slide-resistant pile is simple in structure, can be cast in place and can also be prefabricated (prefabrication means that a steel reinforcement cage is placed into a slide-resistant pile die in advance, and the slide-resistant pile is cast to form the slide-resistant pile structure and is directly used for construction). The construction method is mature, the working procedure is simple, and the construction quality is easy to control.
Drawings
Fig. 1 is an overall three-dimensional sectional working schematic diagram of the slide-resistant pile of the present invention;
FIG. 2 is a schematic cross-sectional view of the upper shaft structure of the present invention;
fig. 3 is a schematic cross-sectional view of the lower pile bottom structure of the present invention.
In the figure: 1. clay; 2. the upper part is a square pile wall; 3. inclining the water collecting hole; 4. an outer square reinforcement cage; 5. an inner circular reinforcement cage; 6. connecting reinforcing steel bars; 7. an upper cross-shaped pile core; 8. the lower part is a square pile bottom; 9. bedrock; 10. gravel; 11. medium coarse sand; 12. fine sand; 13. a water-permeable cushion layer; 14. a drain hole; 15. a right-angled fan-shaped water storage space; 16. and (7) sliding surface.
Detailed Description
The present invention will be further described with reference to the following examples and accompanying drawings. The specific examples are only intended to illustrate the invention in further detail and do not limit the scope of protection of the claims of the present application.
The invention provides an anti-slide pile structure (called anti-slide pile for short, see figures 1-3) with a multi-region combined drainage function, which comprises a lower pile bottom structure, an upper pile body structure and a reinforcement cage whole body; the method is characterized in that a lower pile bottom structure and an upper pile body structure are integrally connected into a whole through a reinforcement cage by adopting an integral pouring method;
the whole reinforcement cage comprises an inner round reinforcement cage 5 and an outer square reinforcement cage 4 from inside to outside; the internal round reinforcement cage 5 and the external square reinforcement cage 4 are welded and connected into a reinforcement cage whole body through the connecting reinforcement 6;
the upper pile body structure comprises an upper cross-shaped pile core 7, an upper square pile wall 2, an inclined water collecting hole 3 and a right-angled fan-shaped water storage space 15; the lower pile bottom structure comprises a lower square pile bottom 8 and a drain hole 14;
the upper cross-shaped pile core 7 and the upper square pile wall 2 are connected into a whole through pouring; the upper part of the internal circular reinforcement cage 5 is arranged in the upper cross-shaped pile core 7; the upper part of an external square reinforcement cage 4 is arranged in the upper square pile wall 2; a right-angled fan-shaped water storage space 15 is formed between the upper cross-shaped pile core 7 and the upper square pile wall 2; the right-angle fan-shaped water storage space 15 is filled with gravels and is full; a plurality of through inclined water collecting holes 3 are formed in the upper square pile wall 2, so that water in a slope body can conveniently flow into the right-angled fan-shaped water storage space 15 and can penetrate through the upper square pile wall 2; one end of the inclined water collecting hole 3 is communicated with the right-angled fan-shaped water storage space 15; gravels 10 are filled in the inclined water collecting holes 3 and are filled in the inclined water collecting holes, so that other impurities are prevented from flowing into the inclined water collecting holes 3 along with water and affecting the water collecting effect;
the crushed stone is composed of fine sand 12, medium coarse sand 11 and gravel 10 according to the particle size of the crushed stone; the right-angle fan-shaped water storage space 15 is filled with fine sand 12, medium coarse sand 11 and gravel 10 from bottom to top in sequence.
The lower part of the whole reinforcement cage is arranged in the lower square pile bottom 8; a plurality of vertically through drain holes 14 are formed in the lower square pile bottom 8, are vertically arranged to shorten the water flow path and penetrate through the lower square pile bottom 8; a water permeable cushion layer 13 (for preventing the fine sand 12 from entering the drain hole 14) is laid on the top of one end of the drain hole 14 and is communicated with the right-angled fan-shaped water storage space 15; the drain holes 14 are filled with gravel 10;
preferably, the height h of the lower square pile bottom 8 is 50-80 cm; the relation between the thickness d of the upper square pile wall 2 and the section length L of the pile body is
The relation between the distance L between two adjacent right-angled fan-shaped water storage spaces 15 and the section length L of the pile body is
Radius r of inner circular reinforcement cage 5outRadius r of right-angled fan-shaped water storage space 15outThe same, and the relation with the section length L of the pile body is
The drainage holes 14 may be circular or square, and have a circular radius rinThe length L of the cross section of the pile body is
The lower square pile bottom 8 passes through the sliding surface 16 and is embedded into the bedrock 9 to a certain depth, namely, the drain hole 14 extends into the bedrock 9, and the lower square pile bottom 8 cannot be completely below the sliding surface 16.
Square, i.e. square.
The invention also provides a construction method (construction method for short) of the anti-slide pile structure with the multi-zone combined drainage function, which is characterized by comprising the following steps:
1) geological exploration and indoor design: carrying out geological survey on the landslide area, mastering information such as stratum lithology, slope body material composition distribution condition, position of a sliding surface 16 and the like, and analyzing and determining the number, size, installation position and depth of pile holes of the anti-slide piles;
2) prefabricating a reinforcement cage: an external square reinforcement cage 4 and an internal round reinforcement cage 5 are processed and manufactured by adopting welding and binding processes; then the internal round reinforcement cage 5 is arranged in the external square reinforcement cage 4 and welded through the connecting reinforcement 6 to form a reinforcement cage whole body;
3) prefabricating a template: the prefabricated template comprises a square pile body outer template and a water storage space template; prefabricating a square pile body outer template according to the size of the section of the pile body; manufacturing a water storage space template according to the shape and the size of the right-angled fan-shaped water storage space 15;
4) excavating pile holes: according to the design, a pile hole is vertically excavated downwards from the surface of a slope body to a certain depth in the bedrock 9, wall protection treatment is carried out, and the section size of the pile hole is ensured to be larger than that of the slide-resistant pile;
5) constructing a lower pile bottom structure: putting the whole reinforcement cage obtained in the step 2) into an excavated pile hole, then sleeving a square pile body outer template on the outer side of the whole reinforcement cage, pouring concrete into the square pile body outer template until the height h of the lower square pile bottom 8 is reached, and reserving a drain hole 14; obtaining a lower pile bottom structure after the concrete is solidified;
6) constructing an upper pile body structure: installing a water storage space template, and pouring concrete; after the concrete is solidified, removing the water storage space template and the square pile body outer template to form an upper pile body structure, and reserving an inclined water collecting hole 3;
7) later construction: filling gravel 10 into a drain hole 14, then paving a water permeable cushion layer 13 on the top of the drain hole 14, then sequentially filling fine sand 12, medium coarse sand 11 and gravel 10 into a right-angled fan-shaped water storage space 15 from bottom to top according to the requirement and the particle size of broken stones, and filling the gravel 10 into an inclined water collecting hole 3;
8) backfilling and tamping: backfilling the space between the pile body and the pile hole of the anti-slide pile, and paving clay 1 on the pile top of the anti-slide pile after tamping; the thickness of the clay layer is 2-5 cm, and the clay layer has the function of preventing water on the surface of the slope from flowing backwards into the pile body.
The construction method adopting the prefabricated slide-resistant pile structure comprises the following steps:
1) geological exploration and indoor design: carrying out geological survey on the landslide area, mastering information such as stratum lithology, slope body material composition distribution condition, position of a sliding surface 16 and the like, and analyzing and determining the number, size, installation position and depth of pile holes of the anti-slide piles;
2) excavating pile holes: according to the design, a pile hole is vertically excavated downwards from the surface of a slope body to a certain depth in the bedrock 9, wall protection treatment is carried out, and the section size of the pile hole is ensured to be larger than that of the slide-resistant pile;
3) prefabricating the anti-slide pile: prefabricating the anti-slide pile according to the design requirement;
4) and (3) constructing the prefabricated slide-resistant pile: hoisting the prefabricated slide-resistant pile, aligning the prefabricated slide-resistant pile with the pile hole, adjusting the verticality of the prefabricated slide-resistant pile, and slowly putting the prefabricated slide-resistant pile into the pile hole to a designed elevation;
5) later construction: filling the gravels 10 into the drainage holes 14, then paving a water permeable cushion layer 13 on the top of the drainage holes 14, then sequentially filling the fine sand 12, the medium coarse sand 11 and the gravels 10 into the right-angled fan-shaped water storage space 15 from bottom to top according to the requirement and the particle size of the crushed stones, and filling the gravels 10 into the inclined water collecting holes 3;
6) backfilling and tamping: backfilling the space between the pile body and the pile hole of the anti-slide pile, and paving clay 1 on the pile top of the anti-slide pile after tamping; the thickness of the clay layer is 2-5 cm, and the clay layer has the function of preventing water on the surface of the slope from flowing backwards into the pile body.
The sliding surface 16 comprises a sliding surface or a sliding belt.
Nothing in this specification is said to apply to the prior art.
Claims (10)
1. An anti-slide pile structure with a multi-zone combined drainage function comprises a lower pile bottom structure, an upper pile body structure and a reinforcement cage body; the method is characterized in that a pouring method is adopted to integrally connect a lower pile bottom structure and an upper pile body structure through a reinforcement cage;
the whole reinforcement cage comprises an inner round reinforcement cage and an outer square reinforcement cage from inside to outside; connecting the internal round reinforcement cage and the external square reinforcement cage into a reinforcement cage whole through connecting reinforcements;
the upper pile body structure comprises an upper cross-shaped pile core, an upper square pile wall, an inclined water collecting hole and a right-angled fan-shaped water storage space; the lower pile bottom structure comprises a lower square pile bottom and a drain hole;
the upper cross-shaped pile core and the upper square pile wall are integrally formed through pouring; the upper part of an internal circular reinforcement cage is arranged in the upper cross-shaped pile core; the upper part of an external square reinforcement cage is arranged in the upper square pile wall; a right-angled fan-shaped water storage space is formed between the upper cross-shaped pile core and the upper square pile wall; broken stones are filled in the right-angle fan-shaped water storage space; a plurality of communicated inclined water collecting holes are formed in the upper square pile wall; one end of the inclined water collecting hole is communicated with the right-angled fan-shaped water storage space; gravel is filled in the inclined water collecting holes;
the lower part of the whole reinforcement cage is arranged in the lower square pile bottom; a plurality of through drain holes are formed in the bottom of the lower square pile; a water permeable cushion layer is laid on the top of one end of the drain hole and is communicated with the right-angled fan-shaped water storage space;
the relation between the thickness d of the upper square pile wall and the section length L of the pile body is
The relation between the distance L between two adjacent right-angled fan-shaped water storage spaces and the section length L of the pile body is
Radius r of right-angle fan-shaped water storage spaceoutThe relation with the section length L of the pile body is
2. The slide-resistant pile structure with multi-zone combined drainage function as claimed in claim 1, wherein the drainage holes are vertically arranged in and penetrate through the lower square pile bottom; the drain holes are filled with gravel.
3. An anti-slide pile structure with multi-zone combined drainage function according to claim 1 or 2, characterized in that the inclined water collecting holes and the drainage holes are filled with gravel.
4. The anti-slide pile structure with multi-zone combined drainage function as claimed in claim 1, wherein the right-angled fan-shaped water storage space is filled with crushed stones; the gravel consists of fine sand, medium coarse sand and gravel; the right-angle fan-shaped water storage space is filled with fine sand, medium coarse sand and gravel from bottom to top in sequence and is filled with the fine sand, the medium coarse sand and the gravel.
5. The slippile structure with the multi-zone combined drainage function of claim 1, which is characterized in that the height h of the lower square pile bottom is 50-80 cm.
6. The slippile structure with multi-zone joint drainage function of claim 1, which is characterized by the radius r of the inner circular reinforcement cageoutRadius r of right-angle fan-shaped water storage spaceoutThe same is true.
7. The slippile structure with multi-zone combined drainage function of claim 1, characterized in that the drainage holes are circular or square with a circular radius rinThe length L of the cross section of the pile body is
8. A construction method of a slide pile structure with multi-zone combined drainage function according to claim 1, characterized in that the construction method comprises the following steps:
1) analyzing and determining the number, size and installation position of the slide-resistant piles and the depth of pile holes;
2) manufacturing an external square reinforcement cage and an internal round reinforcement cage; then, the internal round reinforcement cage is arranged in the external square reinforcement cage and welded to form a reinforcement cage whole;
3) prefabricating a square pile body outer template according to the size of the section of the pile body; manufacturing a water storage space template according to the shape and the size of the right-angled fan-shaped water storage space;
4) excavating a pile hole to the inside of the bedrock, and ensuring that the section size of the pile hole is larger than that of the slide-resistant pile;
5) putting the whole reinforcement cage obtained in the step 2) into an excavated pile hole, then sleeving a square pile body outer template on the outer side of the whole reinforcement cage, pouring concrete into the square pile body outer template until the height h of the lower square pile bottom is reached, and reserving a drain hole; obtaining a lower pile bottom structure after the concrete is solidified;
6) installing a water storage space template, and pouring concrete; removing the water storage space template and the square pile body outer template after the concrete is solidified to form an upper pile body structure, and reserving inclined water collecting holes;
7) paving a water permeable cushion layer on the top of the water drainage hole, then sequentially filling fine sand, medium coarse sand and gravel into the right-angled fan-shaped water storage space from bottom to top, and filling gravel into the inclined water collection hole;
8) and backfilling the space between the pile body and the pile hole of the anti-slide pile, and paving clay on the pile top of the anti-slide pile after tamping.
9. A construction method of a slide pile structure with multi-zone combined drainage function according to claim 1, characterized in that the construction method comprises the following steps:
1) analyzing and determining the number, size and installation position of the slide-resistant piles and the depth of pile holes;
2) excavating a pile hole to the inside of the bedrock, and ensuring that the section size of the pile hole is larger than that of the slide-resistant pile;
3) prefabricating the anti-slide pile: prefabricating the anti-slide pile according to the design requirement;
4) and (3) constructing the prefabricated slide-resistant pile: hoisting the prefabricated slide-resistant pile, aligning the prefabricated slide-resistant pile with the pile hole, adjusting the verticality of the prefabricated slide-resistant pile, and then putting the prefabricated slide-resistant pile into the pile hole to a designed elevation;
5) paving a water permeable cushion layer on the top of the water drainage hole, then sequentially filling fine sand, medium coarse sand and gravel into the right-angled fan-shaped water storage space from bottom to top, and filling gravel into the inclined water collection hole;
6) and backfilling the space between the pile body and the pile hole of the anti-slide pile, and paving clay on the pile top of the anti-slide pile after tamping.
10. The method for constructing a slippile structure with multi-zone combined drainage function according to claim 8 or 9, wherein the drainage holes are filled with gravel; the right-angle fan-shaped water storage space is filled with fine sand, medium coarse sand and gravel; gravel is filled in the inclined water collecting holes; the thickness of the clay layer is 2-5 cm.
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