CN106948347B - Pile pulling method and pile pulling system - Google Patents
Pile pulling method and pile pulling system Download PDFInfo
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- CN106948347B CN106948347B CN201710214302.2A CN201710214302A CN106948347B CN 106948347 B CN106948347 B CN 106948347B CN 201710214302 A CN201710214302 A CN 201710214302A CN 106948347 B CN106948347 B CN 106948347B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
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Abstract
The invention relates to a pile pulling method and a pile pulling system, and belongs to the technical field of pile removing or lifting in water conservancy, highway, railway, municipal administration, bridge and other projects. The pile pulling method comprises the following steps: 1) exposing the top of the pile to be pulled out through pretreatment, and simultaneously preparing a plurality of high-strength anchor cable materials and hoisting equipment; 2) drilling an anchor hole extending to the bottom of the pile to be pulled at the top of the pile to be pulled; 3) one end of the anchor cable material is lowered into the anchor hole, and the other end of the anchor cable material is exposed out of the top of the pile to be pulled; 4) grouting slurry into the anchor hole, and fixing the high-strength anchor cable material into the pile to be pulled to form an anchor rod after the slurry is solidified and reaches a set strength; 5) and lifting the other end of the anchor cable material by using lifting equipment to pull up the pile to be pulled. The pile pulling method and the pile pulling system can quickly and safely pull out the large pile body, are very reliable and stable as a whole, greatly improve safety, save a large amount of cost and improve efficiency.
Description
Technical Field
The invention relates to a pile pulling method and a pile pulling system, and belongs to the technical field of pile removal in water conservancy, highway, railway, municipal administration, bridge and other projects.
Background
In the existing subway tunnel shield tunneling construction, the whole pile influencing the tunnel construction needs to be lifted to a safe height, namely the whole pile influencing the tunnel construction is completely or partially pulled out.
However, according to the knowledge of the applicant, the existing pile pulling technology at home and abroad mainly adopts the following modes:
1) a method of crushing piles by impact and a method of reducing abrasion and pulling out of a full sleeve; the two pile pulling technologies mainly depend on a full casing drilling machine and a large crane, so that the requirements on a construction site are high, the area of the construction site is large, the upper part of the site is not limited by the clear height, and the actual construction environment is difficult to achieve.
2) The method for the static pressure pile pulling of the whole casing pipe adopts the steel casing pipe and combines the injection of high-pressure water and high-pressure bentonite slurry to clear the soil mass around the pile and then carries out pile pulling, but the process is more complicated and longer in practice, and the method is not suitable for pulling out a plurality of piles which are adjacent to each other.
3) The pile head reinforcing steel bar in the cast-in-place pile is directly connected with the pile pulling device, and force is gradually applied until the pile is pulled out, but the reinforcing steel bar in the existing cast-in-place pile has low strength, unreliable welding and uneven stress, and the cast-in-place pile is easily pulled out, which is not allowed in pile pulling construction.
In conclusion, in the existing pile pulling technology, the defects that equipment requirement is high, pile pulling height is not controllable, a large crane is easy to cause accidents when used, site requirement is high, space requirement is high and the like exist, a large-diameter pile cannot be pulled out fast and safely well, and particularly, no good countermeasure is provided for fast and safely pulling out the large-diameter pile in a small space.
Disclosure of Invention
The invention aims to solve the technical problem of the prior art and provides a pile pulling method and a pile pulling system for quickly and safely pulling out piles with different diameters.
One of the technical solutions proposed by the present invention to solve the above technical problems is: a pile pulling method comprises the following steps:
1) exposing the top of the pile to be pulled out through pretreatment, and simultaneously preparing a plurality of high-strength anchor cable materials and hoisting equipment;
2) drilling an anchor hole extending to the bottom of the pile to be pulled at the top of the pile to be pulled;
3) one end of the anchor cable material is lowered into the anchor hole, and the other end of the anchor cable material is exposed out of the top of the pile to be pulled;
4) grouting slurry into the anchor hole, and fixing the high-strength anchor cable material into the pile to be pulled to form an anchor rod after the slurry is solidified and reaches a set strength;
5) and lifting the other end of the anchor cable material by using lifting equipment to pull up the pile to be pulled.
The second technical scheme provided by the invention for solving the technical problems is as follows: a pile pulling system is used in the pile pulling method and is arranged near a pile to be pulled which is fixed in a soil body and exposed at the top, and comprises a plurality of high-strength anchor cable materials and lifting equipment.
The effect of the invention adopting the technical scheme is as follows: the invention directly drills an anchor hole extending to the bottom of a pile to be pulled out at the top of the pile to be pulled out, then puts one end of an anchor cable material into the anchor hole, and puts the other end of the anchor cable material out of the top of the pile to be pulled out, then pours slurry into the anchor hole, fixes the high-strength anchor cable material into the pile to be pulled out to form an anchor rod, and finally lifts the other end of the anchor cable material through a lifting device to pull out the pile to be pulled out.
The pile pulling device can anchor and lift piles to be pulled out with different diameters (large, medium and small), and meanwhile reinforce the piles to be pulled out, can effectively prevent pile breakage in pile pulling and quickly and safely pull out the large-diameter piles, is particularly suitable for pulling out a plurality of piles which are adjacent to each other in a small space, is very reliable and stable as a whole, greatly improves safety, saves a large amount of cost and improves efficiency.
The improvement of one of the above technical schemes is as follows: in the step 2), drilling a static blast hole extending to the bottom of the pile to be pulled at the top of the pile to be pulled; in the step 5), after the other end of the anchor cable material is lifted by a lifting device to pull up the pile to be pulled out, firstly, a crushing agent is poured into the static blast hole, the orifice of the static blast hole is blocked by quick-hardening cement for 12-18 hours, and then, the pile body is crushed by a crushing device.
The effect of the invention adopting the technical scheme is as follows: the static blasting hole extending to the bottom of the pile to be pulled is drilled at the top of the pile to be pulled, so that after the other end of the anchor cable material is lifted by a lifting device to pull the pile to be pulled, a crushing agent is poured into the static blasting hole, an orifice of the static blasting hole is blocked by quick-hardening cement for 12-18 hours, then a pile body is crushed by crushing equipment, concrete can be rapidly decomposed by combining methods of concrete cutting, steel bar gas cutting and the like, the upper part of the pile is detached, and the pile pulling engineering is smoothly turned to the next process and the next pile.
One of the perfections of the technical scheme is as follows: in the step 1), a working platform is arranged on other piles near the pile to be pulled or on soil around the pile to be pulled; in the step 5), the hoisting equipment is a penetrating jack, a crane or a winch which is arranged on the working platform, and the penetrating jack, the crane or the winch continuously stretches the other end of the anchor cable material to continuously pull up the pile to be pulled.
The effect of the invention adopting the technical scheme is as follows: according to the invention, the working platform is arranged on other piles near the pile to be pulled or on the soil body around the pile to be pulled, and the lifting equipment adopts the penetrating jack, the crane or the winch arranged on the working platform, so that the other end of the anchor cable material can be continuously tensioned through the penetrating jack, the crane or the winch to continuously pull the pile, and the whole structure is simple and reliable.
The improvement of one of perfections of the technical scheme is as follows: the working platform is a reinforced concrete platform, a steel structure frame platform or a combined structure platform; the center-penetrating jack is fixedly arranged on the reinforced concrete platform, the steel structure frame platform or the combined structure platform through a reaction frame; the crane or the winch is arranged on the reinforced concrete platform, the steel structure frame platform or the combined structure platform.
The effect of the invention adopting the technical scheme is as follows: the invention can continuously pull up the pile with the head part positioned above the ground surface or integrally positioned below the ground surface by arranging the reinforced concrete platform, the steel structure frame platform or the combined structure platform, and the whole structure is simple and reliable.
One improvement of the perfection of one of the technical schemes is as follows: the working platform is a sunk well platform, and the center penetrating jack is fixed on the sunk well platform.
The effect of the invention adopting the technical scheme is as follows: through the arrangement of the open caisson platform, the open caisson is particularly suitable for continuously pulling the piles integrally positioned below the ground surface, and the open caisson has a simple and reliable integral structure.
The second improvement of the above technical scheme is that: the depth of the anchor hole and the length of the anchor rod are smaller than the length of the pile to be pulled and larger than the minimum anchoring length of the anchor rod, and the minimum anchoring length L of the anchor rod is calculated according to the following formula:
in the formula, a is a safety factor; sigma is the strength of the anchor cable material; a is the cross-sectional area of the anchor cable material; d is the anchor eye diameter; tau is the shear strength of the anchor rod and the hole wall.
The third perfection of one of the technical schemes is as follows: the anchor cable material is provided with three grouting pipes with outlets respectively positioned at the bottom, the middle part and the upper part of the anchor hole; grouting slurry into the anchor hole by adopting pressure grouting, wherein the slurry is formed by mixing PO52.5 cement, a cement slurry pore canal grouting agent and water, and the water-cement ratio of the slurry is 0.35-0.45; and (5) performing pressure grouting by adopting a mortar stirrer and a grouting pump.
The fourth improvement of one of the above technical schemes is: in the step 5), before pile pulling through the hoisting equipment, primary pile circumference resistance elimination is performed, and after pile pulling through the hoisting equipment fails, secondary pile circumference resistance elimination is performed, or after pile pulling through the hoisting equipment fails, anchor withdrawing of the anchor cable material is performed through an anchor withdrawing device.
The fifth perfection of one of the technical schemes is as follows: in the step 5), the number of the anchor cable materials to be lifted is gradually reduced in the pile pulling process through the lifting equipment.
The second improvement of the above technical scheme is: a static blasting hole extending towards the bottom in the pile to be pulled is formed in the top of the pile to be pulled; and a crushing agent is poured into the static blasting hole and a rapid hardening cement block is blocked.
The second improvement of the above technical scheme is: and working platforms are arranged on other piles near the pile to be pulled or soil around the pile to be pulled.
Drawings
The invention will be further described with reference to the accompanying drawings in which:
fig. 1 is a schematic view of a pile pulling method and a pile pulling device adopted by a pile pulling system according to a first embodiment of the invention.
Fig. 2 is a left side view of fig. 1.
Fig. 3 is a schematic view of the anchor hole and the static blasthole drilled in the pile to be pulled of fig. 1.
Detailed Description
Example one
The pile extracting method of the embodiment, as shown in fig. 1, fig. 2 and fig. 3, includes the following steps:
1) the top of the pile 1 to be pulled is exposed after pretreatment, and a plurality of high-strength anchor cable materials 2 and hoisting equipment are arranged at the same time.
The pile 1 to be pulled out of the embodiment can be a friction pile buried in soil, a partially rock-socketed end-bearing pile or a secant pile, a bearing platform pile and a driven pile buried at a certain depth below the ground surface, and the like. The head of the friction pile or end-bearing pile is exposed to the ground surface.
The anchor cable material 2 of the present embodiment may be made of a metal hard or soft material. Metal hardwares, such as: a bonded steel strand, a pre-stressed steel strand, a high-strength steel wire rope or a high-strength steel bar, and the like; or non-metallic hard or soft materials, such as: fibers, plastics or nylon, and the like.
2) Drilling an anchor hole 1-1 extending to the bottom of the pile 1 to be pulled at the top of the pile; the anchor eye 1-1 of this embodiment is an anchor eye located at the center of the cross section of the pile 1 to be pulled or at least two anchor eyes evenly distributed along the circumference of the center of the cross section of the pile 1 to be pulled.
In the embodiment, a crawler-type drilling machine D150 is adopted for drilling the anchor hole 1-1, and the power of a single machine is 75 kW; meanwhile, 15m3, a 1.3MPa air compressor and 135kW of power of the air compressor are matched. The working efficiency is 60m/8 hr. After drilling, cleaning dry slurry by using clean water, pumping free water, and plugging the hole opening by using a plug before the anchor cable material 2 is put down so as to prevent foreign matters from entering the hole. If the pile body still serves as an engineering pile, a geological drilling machine can be adopted for drilling holes in order to avoid the damage of the crawler-type drilling machine to the pile body. If the top surface of the pile body is below the ground surface, the center and the diameter of the pile can be determined through surveying, and the anchor hole 1-1 is drilled through a sleeve method.
3) One end of the anchor cable material 2 is lowered into the anchor hole 1-1, and the other end of the anchor cable material is exposed out of the top of the pile 1 to be pulled.
4) Grouting slurry into the anchor hole 1-1, and fixing the high-strength anchor cable material 2 into the pile to be pulled 1 to form an anchor rod after the slurry is solidified and reaches a set strength;
the depth of the anchor hole 1-1 and the length of the anchor rod of the embodiment are less than the length of the pile to be pulled 1 and greater than the minimum anchoring length of the anchor rod, and the minimum anchoring length L of the anchor rod is calculated according to the following formula:
in the formula, a is a safety factor; sigma is the strength of the anchor cable material; a is the cross-sectional area of the anchor cable material; d is the anchor eye diameter; tau is the shear strength of the anchor rod and the hole wall.
5) And lifting the other end of the anchor cable material 2 by using lifting equipment to pull up the pile 1 to be pulled. The hoisting equipment generally adopts equipment which can continuously or reciprocally hoist to pull the pile 1 to be pulled.
In the embodiment, in the step 1), a working platform 3 is arranged on other piles near the pile 1 to be pulled or on soil around the pile 1 to be pulled; the working platform 3 can be a reinforced concrete platform, a steel structure frame platform or a combined structure platform, and can also be a sunk well platform, and the like.
In order to rapidly decompose the concrete, the upper pile body of the pile to be pulled out 1 is dismantled, and the pile pulling engineering is smoothly turned to the next procedure and the next pile:
in the embodiment, in the step 2), a static blast hole 1-2 extending towards the bottom of the pile to be pulled 1 is drilled at the top of the pile to be pulled;
in the embodiment, in the step 5), after the other end of the anchor cable material 2 is lifted by the lifting device to pull up the pile 1 to be pulled out, a crushing agent is poured into the static blasting hole 1-2, the orifice of the static blasting hole 1-2 is blocked by fast setting cement for 12-18 hours, and then the pile body is crushed by the crushing device. The static blasting holes 1-2 are drilled in advance at the part to be blasted and distributed in a cross shape. The crushing agent is of SCA-2 type (soundless crushing agent), is suitable for 10-25 ℃, is mixed with 1.5 liters of water according to 5 kilograms of crushing agent per bag, and is stirred to ensure that the crushing agent is completely dissolved in the water to form slurry. Pouring the slurry into a static blast hole 1-2 within 10-15 minutes after stirring, filling the static blast hole to a position 15mm away from the hole opening, pouring the slurry into the hole and stirring the slurry in the hole to ensure that no air holes exist in the drilled hole; after filling, plugging the hole opening with quick-hardening cement; the effect can be achieved after 12-18 hours.
In order to simply and reliably continuously pull up the pile 1 to be pulled out, in the step 5), the lifting equipment is a penetrating jack 5 arranged on the working platform 3, and the penetrating jack 5 is fixedly arranged on a reinforced concrete platform, a steel structure frame platform or a combined structure platform through a reaction frame 4; when it is necessary to extract the pile located entirely below the ground surface, the piercing jack 5 is fixed to the open caisson platform, and so on. And the penetrating jack 5 continuously stretches the other end of the anchor cable material 2 to continuously pull up the pile 1 to be pulled. The center-penetrating jack method 5 realizes jacking, oil return and re-jacking through two sets of top and bottom anchorage devices of a jack cylinder, the top anchorage device realizes jacking, and the bottom anchorage device realizes locking.
In order to ensure compact grouting, the anchor cable material 2 of the embodiment is provided with three grouting pipes with outlets respectively positioned at the bottom, the middle part and the upper part of the anchor hole 1-1; grouting slurry into the anchor hole 1-1 by adopting pressure grouting, wherein the slurry is formed by mixing PO52.5 cement, a cement slurry pore canal grouting agent and water, and the water-cement ratio of the slurry is 0.35-0.45; and (5) performing pressure grouting by adopting a mortar stirrer and a grouting pump. A mortar block manufacturing test can be carried out before grouting, and the 3d strength of the test block is ensured to reach 25MPa, and the 10d strength of the test block reaches 30 MPa.
And (4) performing pressure grouting (grouting slurry) by adopting a mortar stirrer and a grouting pump. And grouting from the bottom to the top, and opening the previous grouting pipe when the grouting pipes are grouted to the previous grouting pipe until the grouting pipes reach the designed position. And 3 groups of cement paste test blocks are manufactured by grouting every time, the cement paste blocks are adopted, the test blocks are pressed for 3d and 7d, and the test blocks can be promoted after the strength is reached.
In the step 5), before pile pulling through the hoisting equipment, one pile circumference resistance elimination is carried out. If the pile pulling through the hoisting equipment fails, the resistance elimination of the periphery of the secondary pile is carried out, and the successful lifting can be achieved by adding the anchor cable material 2. In the pile pulling process through the hoisting equipment, the number of anchor cable materials is gradually reduced, and the working efficiency can be improved.
The lifting equipment can adopt a reaction frame, the height of the reaction frame determines the height of the pile 1 to be pulled which can be lifted once, the lifted part is broken, the peripheral concrete of the anchor cable material 2 is cleaned, the secondary lifting is realized, the process is repeated, the specified lifting height can be reached, or the lifting is completed completely;
in the step 5), after the pile pulling through the hoisting equipment fails, the anchor withdrawing device is used for withdrawing the anchor of the anchor cable material. In order to avoid anchor withdrawal failure and lead to breakage of a plurality of anchor cable materials, a discharge sand bucket or a multilayer sulfur resistance wire cushion layer is additionally arranged between a base of the reaction frame and a top seat of the reaction frame, so that large load unloading is facilitated; or coarse sand with the thickness of 10cm is arranged at the bottom of the ground beam of the reaction frame and the base of the reaction frame, the periphery of the ground beam is protected by quick-hardening cement or the sides of the sand bags are pressed, and before unloading, the sand at the bottom of the ground beam of the reaction frame is removed, so that the effect of unloading part of load is achieved;
in the unloading process, if part of the anchor cable material is broken or otherwise damaged, the anchor cable material embedded below the pile top can be broken to expose the concrete, and then the connector is used to achieve the purpose of continuous lifting.
As shown in fig. 1, fig. 2 and fig. 3, the pile pulling system of the present embodiment is used in the pile pulling method, and the pile pulling system is disposed near the pile 1 to be pulled which is fixed in the soil body and has an exposed top. Comprises a plurality of high-strength anchor cable materials 2 and hoisting equipment.
The pile 1 to be pulled out in the pile pulling system of the embodiment is also a friction pile, a partially rock-embedded end-bearing pile or an occlusive pile, a bearing platform pile and a driven pile which are buried in the soil body to a certain depth, and the head of the friction pile or the end-bearing pile is exposed on the ground surface.
The anchor cable material 2 in the pile pulling system of this embodiment is also made of a hard or soft metal material, for example: a bonded steel strand, a pre-stressed steel strand, a high-strength steel wire rope or a high-strength steel bar, and the like; or non-metallic hard or soft materials, such as: fibers, plastics or nylon, and the like.
The top of the pile to be pulled 1 is drilled with an anchor hole 1-1 extending to the bottom in the pile to be pulled. The anchor eye 1-1 in the pile pulling system of this embodiment is also an anchor eye located at the center of the cross section of the pile 1 to be pulled or at least two anchor eyes evenly distributed along the circumference of the center of the cross section of the pile 1 to be pulled.
One end of the anchor cable material 2 is arranged at the bottom of the anchor hole 1-1, the other end of the anchor cable material 2 is exposed out of the top of the pile 1 to be pulled, slurry which is used for fixing the anchor cable material 2 in the pile 1 to be pulled to form an anchor rod after solidification is poured in the anchor hole 1-1, and the hoisting equipment is used for lifting the other end of the anchor cable material 2 to pull the pile 1 to be pulled.
The depth of the anchor hole 1-1 and the length of the anchor rod in the pile pulling system of the embodiment are also smaller than the length of the pile to be pulled 1 and larger than the minimum anchoring length of the anchor rod, and the minimum anchoring length L of the anchor rod is calculated according to the following formula:
in the formula, a is a safety factor; sigma is the strength of the anchor cable material; a is the cross-sectional area of the anchor cable material; d is the anchor eye diameter; tau is the shear strength of the anchor rod and the hole wall.
The top of a pile to be pulled 1 in the pile pulling system of the embodiment is provided with a static blast hole 1-2 extending towards the bottom in the pile to be pulled; and a crushing agent is poured into the static blast hole 1-2 and a rapid hardening cement block is sealed.
In the pile pulling system of the embodiment, a working platform 3 is arranged on other piles near the pile 1 to be pulled or on soil around the pile to be pulled. The working platform 3 is also a reinforced concrete platform, a steel structure frame platform, a composite structure platform or a sinking platform, etc.
The hoisting equipment in the pile pulling system of the embodiment is also a center-penetrating jack 5 arranged on the working platform 3, and the center-penetrating jack 5 is fixedly installed on a reinforced concrete platform, a steel structure frame platform or a combined structure platform through a reaction frame 4; when it is necessary to extract the pile located entirely below the ground surface, the piercing jack 5 is fixed to the open caisson platform, and so on. And the penetrating jack 5 continuously stretches the other end of the anchor cable material 2 to continuously pull up the pile 1 to be pulled.
The anchor cable material 2 is provided with three grouting pipes with outlets respectively positioned at the bottom, the middle part and the upper part of the anchor hole 1-1.
Example two
The pile pulling method of the present embodiment is an improvement on the basis of the first embodiment, and is different from the first embodiment in that:
in the embodiment, the total length of the pile to be pulled 1 to be lifted is 24m, the pile diameter is 1500mm, and the pile needs to be lifted to a height of 7-8m, which accounts for 30% of the total length of the pile to be pulled 1, 24 m. Through calculation, the design load of pile pulling force is 8000kN, and the checking load is 10000 kN.
Thus, 4 bundles of CPS15A-12 type shear force dispersion type anchor cables are adopted as the anchor cable material 2. Each CPS15A-14 type shear force dispersion type anchor cable adopts 14-phi 15.24 high-strength and low-relaxation steel stranded wires, and the tensile strength is 1860 MPa.
The lifting equipment of the embodiment still adopts the penetrating jack 5, 4 4000kN penetrating jacks 5 are selected as lifting power equipment, and the total lifting capacity reaches 12800kN according to the consideration of 0.8 efficiency.
Before paying off, the position of the reaction frame 4 is firstly woven on the terrace, and then the position of the anchor hole 1-1 is determined according to the arrangeable position of the reaction frame 4. The anchor eye 1-1 of the embodiment is four anchor eyes with the centers distributed at four corner points of a square with the side length of 60cm, the aperture of the anchor eye 1-1 is 150mm, and the side length of the square is parallel to and perpendicular to the crossbeam of the reaction frame respectively.
Since the pile periphery is affected by the connection of retaining walls, canal walls, etc., a crawler drill D150 may be employed, which connection is eliminated by drilling. When the connection is eliminated, the drilling range is properly enlarged and deepened, and large reaming and hole collapse in the range below the strong connection is prevented. The strong connection elimination selection is performed simultaneously with the anchor eye 1-1.
The friction between the pile periphery and the soil layer is partially eliminated by drilling a certain number of holes on the pile periphery and properly flushing water. 50PVC floral tubes of downthehole lower diameter prevent the hole of collapsing on the one hand, and on the other hand is used for promoting the effect that the back stake was whole to be irrigated mud liquid again, consolidates the stake week soil body, resumes the stake.
The pile pulling method comprises the following stages of dividing the estimated lifting force into 10 stages, observing 10 minutes at each stage, measuring data once per minute, and analyzing the relation between the displacement of the pile top along with time and the displacement along with load. And simultaneously monitoring the surface settlement displacement, the structural stress and the deformation. The estimated lifting force is 8000kN, and the specific loads are classified into 800kN, 1600kN and 2400kN until the loads are started.
In order to restore the function of the pile and reduce the adverse effects on surrounding buildings, it is necessary to carry out a back-filling with cement paste. And determining the recharging time and recharging pressure on the basis of the settlement observation of the building. For building safety, the recharge should be early and not late, and for the lifting of adjacent piles, the compaction effect is achieved, and the recharge should be late and not early. The recharge pressure is too high, which easily causes the rising of surrounding buildings, the resistance eliminating range is relatively small, and the low-pressure recharge which is not more than 1MPa is adopted. Grouting equipment is applied from bottom to top, and redundant water around the pile is discharged to the ground surface along the PVC perforated pipe; the grout infiltrates into the soil around the pile to connect the soil with the rest of the pile body into a whole.
EXAMPLE III
The pile pulling method of the embodiment is an improvement on the basis of the first embodiment and the second embodiment, and is different from the embodiments in that: in step 5), the hoisting device is a crane or a winch disposed on the working platform 3, and the crane or the winch continuously stretches the other end of the anchor cable material 2 to continuously lift the pile 1 to be pulled. The crane or the winch is arranged on the reinforced concrete platform, the steel structure frame platform or the combined structure platform.
The present invention is not limited to the above-described embodiments. All technical solutions formed by equivalent substitutions fall within the protection scope of the claims of the present invention.
Claims (12)
1. A pile pulling method is characterized by comprising the following steps:
1) exposing the top of the pile to be pulled out through pretreatment, and simultaneously preparing a plurality of high-strength anchor cable materials and hoisting equipment;
2) drilling an anchor hole extending to the bottom of the pile to be pulled at the top of the pile to be pulled;
3) one end of the anchor cable material is lowered into the anchor hole, and the other end of the anchor cable material is exposed out of the top of the pile to be pulled;
4) grouting slurry into the anchor hole, and fixing the high-strength anchor cable material into the pile to be pulled to form an anchor rod after the slurry is solidified and reaches a set strength;
5) and lifting the other end of the anchor cable material by using lifting equipment to pull up the pile to be pulled.
2. The pile pulling method according to claim 1, wherein: in the step 2), drilling a static blast hole extending to the bottom of the pile to be pulled at the top of the pile to be pulled; in the step 5), after the other end of the anchor cable material is lifted by a lifting device to pull up the pile to be pulled out, firstly, a crushing agent is poured into the static blast hole, the orifice of the static blast hole is blocked by quick-hardening cement for 12-18 hours, and then, the pile body is crushed by a crushing device.
3. A pile pulling method according to claim 1 or 2, characterized in that: in the step 1), a working platform is arranged on other piles near the pile to be pulled or on soil around the pile to be pulled; in the step 5), the hoisting equipment is a penetrating jack, a crane or a winch which is arranged on the working platform, and the penetrating jack, the crane or the winch continuously stretches the other end of the anchor cable material to continuously pull up the pile to be pulled.
4. A pile pulling method according to claim 3, characterized in that: the working platform is a reinforced concrete platform, a steel structure frame platform or a combined structure platform; the center-penetrating jack is fixedly arranged on the reinforced concrete platform, the steel structure frame platform or the combined structure platform through a reaction frame; the crane or the winch is arranged on the reinforced concrete platform, the steel structure frame platform or the combined structure platform.
5. A pile pulling method according to claim 3, characterized in that: the working platform is a sunk well platform, and the center penetrating jack is fixed on the sunk well platform.
6. A pile pulling method according to claim 1 or 2, characterized in that: the depth of the anchor hole and the length of the anchor rod are smaller than the length of the pile to be pulled and larger than the minimum anchoring length of the anchor rod, and the minimum anchoring length L of the anchor rod is calculated according to the following formula:
in the formula, a is a safety factor; sigma is the strength of the anchor cable material; a is the cross-sectional area of the anchor cable material; d is the anchor eye diameter; tau is the shear strength of the anchor rod and the hole wall.
7. A pile pulling method according to claim 1 or 2, characterized in that: the anchor cable material is provided with three grouting pipes with outlets respectively positioned at the bottom, the middle part and the upper part of the anchor hole; grouting slurry into the anchor hole by adopting pressure grouting, wherein the slurry is formed by mixing PO52.5 cement, a cement slurry pore canal grouting agent and water, and the water-cement ratio of the slurry is 0.35-0.45; and (5) performing pressure grouting by adopting a mortar stirrer and a grouting pump.
8. A pile pulling method according to claim 1 or 2, characterized in that: in the step 5), before pile pulling through the hoisting equipment, primary pile circumference resistance elimination is performed, and after pile pulling through the hoisting equipment fails, secondary pile circumference resistance elimination is performed, or after pile pulling through the hoisting equipment fails, anchor withdrawing of the anchor cable material is performed through an anchor withdrawing device.
9. A pile pulling method according to claim 1 or 2, characterized in that: in the step 5), the number of the anchor cable materials to be lifted is gradually reduced in the pile pulling process through the lifting equipment.
10. A pile pulling system is used in the pile pulling method of claim 1, and is arranged near a pile to be pulled which is fixed in a soil body and exposed at the top, and comprises a plurality of high-strength anchor cable materials and hoisting equipment.
11. The pile pulling system of claim 10, wherein: a static blasting hole extending towards the bottom in the pile to be pulled is formed in the top of the pile to be pulled; and a breaking agent is poured into the static blasting hole and a rapid hardening cement block is blocked.
12. The pile pulling system of claim 10, wherein: and working platforms are arranged on other piles near the pile to be pulled or soil around the pile to be pulled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN110424393A (en) * | 2019-08-28 | 2019-11-08 | 天津建岩岩土工程有限公司 | Discarded stake pull-up and its method |
| CN111926815B (en) * | 2020-08-11 | 2021-04-02 | 江苏建院营造股份有限公司 | Tubular pile pulling method and device |
| CN115030158B (en) * | 2022-05-27 | 2023-07-18 | 中铁第六勘察设计院集团有限公司 | Assembled device for lifting large-diameter cast-in-place pile and green construction method |
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| CN101619574B (en) * | 2009-07-28 | 2011-04-13 | 朱奎 | Prestress pulling resistant anchor pile and constructing method thereof |
| CN101629421A (en) * | 2009-08-04 | 2010-01-20 | 上海隧道工程股份有限公司 | Method for pulling out deep pile foundation by utilizing full slewing drilling machine |
| CN101644053B (en) * | 2009-09-04 | 2011-01-19 | 凌光荣 | Method for enhancing pulling-resistant and tensile-resistant capability of soft and weak soil layer anchor rod/anchor rope |
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| CN105442605B (en) * | 2015-11-20 | 2017-06-30 | 常州第一建筑集团有限公司 | Extract PHC and be reused in deep foundation pit supporting construction method |
| CN206928296U (en) * | 2017-04-01 | 2018-01-26 | 南京瑞迪建设科技有限公司 | Pile pulling system |
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