CN106948347A - Pile extracting method and pile pulling system - Google Patents

Abstract

The invention relates to a static pile pulling method and a pile pulling system, belonging to the technical field of removing or lifting piles in water conservancy, highway, railway, municipal, bridge and other projects. The pile pulling method includes the following steps: 1) Expose the top of the pile to be pulled out after pretreatment, and equip multiple high-strength anchor cable materials and lifting equipment at the same time; 2) Drill the top of the pile to be pulled out and extend to the bottom 3) Put one end of the anchor cable material into the anchor hole, the other end of which is exposed to the top of the pile to be pulled out; 4) Fill the anchor hole with slurry, wait for the slurry to solidify and After reaching the set strength, fix the high-strength anchor cable material in the pile to be pulled out to form an anchor rod; 5) lift the other end of the anchor cable material by lifting equipment to pull up the pile to be pulled out. The pile pulling method and the pile pulling system can quickly and safely pull out large piles, are very reliable and stable as a whole, greatly improve safety, save a lot of cost, and improve efficiency.

Description

Pile Pulling Method and Pile Pulling System

technical field

The invention relates to a pile pulling method and a pile pulling system, belonging to the technical field of removing piles in water conservancy, highway, railway, municipal, bridge and other projects.

Background technique

In the shield excavation construction of existing subway tunnels, it is necessary to lift the entire piles that affect the tunnel construction to a safe height, that is, to pull out the entire piles that affect the tunnel construction completely or partially.

However, as far as the applicant knows, the existing domestic and foreign pile extraction technologies mainly adopt the following methods:

1) Impact pile breaking method and full-casing wear-reducing extraction method; these two pile-extraction technologies mainly rely on full-casing drilling rigs and large cranes, so the requirements for the construction site are relatively high. The construction site has a large area and there is no clear height limit on the upper part of the site. However, the actual construction environment is difficult to achieve.

2) The method of static pressure pile extraction with full casing. This method uses steel casing and combined with spraying high-pressure water and high-pressure bentonite slurry to remove the surrounding soil of the pile, and then pulls the pile. However, the process is more complicated and the actual time is longer. , especially for the extraction of multiple piles next to each other cannot be applied.

3) Directly connect the pile head steel bar in the cast-in-place pile with the pulling pile, and apply force gradually until the pile is pulled out. However, the steel bar in the existing cast-in-place pile has low strength, unreliable welding, and uneven force, and it is easy to pull out the cast-in-place pile. The pile is pulled out, which is not allowed in the pile pulling construction.

To sum up, in the existing pile pulling technology, there are shortcomings such as high equipment requirements, uncontrollable pile pulling height, accident-prone use of large cranes, high site requirements, and high space requirements, which cannot quickly and safely pull out large-diameter piles. , especially for the fast and safe extraction of large-diameter piles in small spaces, there is no good countermeasure.

Contents of the invention

The technical problem to be solved by the present invention is to propose a pile pulling method and a pile pulling system for quickly and safely pulling out piles of different diameters in view of the deficiencies in the prior art.

One of the technical solutions proposed by the present invention for solving the above-mentioned technical problems is: a method for pulling out piles, comprising the following steps:

1) After pretreatment, the top of the pile to be pulled is first exposed, and multiple high-strength anchor cable materials and lifting equipment are equipped at the same time;

2) Drill the anchor hole extending to the bottom of the pile to be pulled out;

3) Lower one end of the anchor cable material into the anchor hole, and expose the other end of the pile to be pulled out;

4) pouring grout into the anchor hole, and after the grout solidifies and reaches a set strength, fix the high-strength anchor cable material in the pile to be pulled out to form an anchor rod;

5) Lifting the other end of the anchor cable material by lifting equipment to pull up the pile to be pulled out.

The second technical solution proposed by the present invention to solve the above technical problems is: a pile pulling system used in the above pile pulling method, the pile pulling system is arranged near the pile to be pulled which is fixed in the soil and exposed at the top, Comprising a plurality of high-strength anchor cable materials and lifting equipment, it is characterized in that: the top of the pile to be pulled out is drilled with an anchor hole extending to the bottom of the pile to be pulled out, and one end of the anchor cable material is located at the anchor At the bottom of the hole, the other end of the anchor cable material exposes the top of the pile to be pulled out, and the anchor hole is filled with a solidified slurry for fixing the anchor cable material in the pile to be pulled out to form an anchor rod. The lifting device is used to lift the other end of the anchor cable material to pull up the pile to be pulled out.

The present invention adopts the effect of the above-mentioned technical scheme: the present invention directly drills an anchor hole extending toward the bottom of the pile to be pulled out, and then lowers one end of the anchor cable material into the anchor hole, and the other end exposes the pile to be pulled out At the top, grout is poured into the anchor hole, the high-strength anchor cable material is fixed in the pile to be pulled out to form an anchor rod, and finally the other end of the anchor cable material is lifted by the lifting device to pull up the pile to be pulled out. The anchor rod in the existing geotechnical anchoring technology is transferred to the pile pulling. Compared with the traditional thinking of pulling out piles, which is to blindly fix the appearance of the piles and then pull them out, the present invention breaks through this thinking. Potential, the piles to be pulled out are drilled first and anchored and then pulled out, forming an anchor first and then pulling out, so it is very unexpected.

The present invention can anchor and lift piles of different diameters (large, medium and small) and at the same time reinforce the piles to be pulled out, which can effectively prevent piles from being pulled out and quickly and safely pull out large-diameter piles, especially It is very suitable for pulling out multiple piles that are adjacent to each other in a small space, and the whole is very reliable and stable, greatly improving safety, saving a lot of cost, and improving efficiency.

The improvement of one of the above technical solutions is: in the step 2), a static blast hole extending to the bottom of the pile to be extracted is drilled on the top of the pile; After the other end of the above-mentioned anchor cable material is used to pull up the pile to be pulled out, first pour the breaking agent into the static blasting hole and block the opening of the static blasting hole with rapid hardening cement for 12-18 hours, and then the pile body is broken by the crushing equipment .

The present invention has the effect of adopting the above-mentioned technical solution: by drilling a static blast hole extending toward the bottom of the pile to be pulled out, after the other end of the anchor cable material is lifted by the lifting device to pull up the pile to be pulled out, First pour the breaking agent into the static blasting hole and block the opening of the static blasting hole with quick-hardening cement for 12-18 hours, then use the crushing equipment to crush the pile body, combined with concrete cutting and gas cutting steel bars, etc., can quickly decompose the concrete , Realize the removal of the upper part of the pile, and smoothly turn the pile pulling project to the next process and the next pile.

One of the improvement of one of the above-mentioned technical solutions is: in the step 1), a working platform is provided on other piles near the pile to be pulled out or on the soil around the pile to be pulled out; in the step 5) Among them, the lifting equipment is a through-hole jack, crane or hoist arranged on the working platform, and the other end of the anchor cable material is continuously stretched by the through-hole jack, crane or hoist to continuously pull up the pile to be pulled out. .

The present invention adopts the effect of the technical scheme as follows: the present invention is provided with a working platform on other piles near the piles to be pulled out or on the soil around the piles to be pulled out, and the hoisting equipment adopts a through-hole jack, a crane, etc. that are arranged on the working platform. Machine or hoist, so that the other end of the anchor cable material can be continuously stretched by a through-hole jack, crane or hoist, and the pile can be pulled up continuously. The overall structure is simple and reliable.

The improvement of one of the above-mentioned technical solutions is: the working platform is a reinforced concrete platform, a steel structure frame platform or a composite structure platform; On a platform or a combined structure platform; the crane or winch is set on a reinforced concrete platform, a steel structure frame platform or a combined structure platform.

The effect of adopting the above-mentioned technical solution in the present invention is that the present invention can continuously pull up the pile whose head is above the ground surface or the whole is below the ground surface by setting a reinforced concrete platform, a steel structure frame platform or a combined structure platform, and the overall structure is simple reliable.

The improvement of one of the perfections of one of the above technical solutions is: the working platform is a caisson platform, and the through-hole jack is fixed on the caisson platform.

The effect of adopting the above-mentioned technical solution in the present invention is that, by setting the caisson platform, it is especially suitable for continuous uplifting of piles located below the ground surface as a whole, and the overall structure is simple and reliable.

The second improvement of one of the above technical solutions is: the depth of the anchor hole and the length of the anchor rod are less than the length of the pile to be pulled and greater than the minimum anchor length of the anchor rod, the minimum anchor length L of the anchor rod Calculate according to the formula:

In the formula, a is the safety factor; σ is the strength of the anchor cable material; A is the cross-sectional area of the anchor cable material; d is the diameter of the anchor hole; τ is the shear strength of the anchor rod and the hole wall.

The third improvement of one of the above technical solutions is: the anchor cable material is provided with three grouting pipes whose outlets are respectively located at the bottom, middle and upper part of the anchor hole; pressure grouting is used to pour grout into the anchor hole, and the grout The body is a slurry formed by mixing PO52.5 cement, a grouting agent for cement slurry channels and water, and the water-binder ratio of the slurry is 0.35-0.45; a mortar mixer and a grouting pump are used for pressure grouting.

The fourth improvement of one of the above technical solutions is: in the step 5), before the pile is pulled out by the lifting device, the resistance around the pile is carried out once, and if the pile is pulled out by the lifting device, the resistance is removed for the second time. , or if the pile fails to be pulled out by the lifting equipment, the anchor cable material is withdrawn by the anchor withdrawer.

The fifth improvement of one of the above technical solutions is: in the step 5), during the process of pulling out the pile by the hoisting equipment, gradually reduce the amount of lifting the anchor cable material.

The improvement of the second technical solution is: the top of the pile to be pulled out is formed with a static blast hole extending toward the bottom of the pile to be pulled out; the static blast hole is poured with breaking agent and blocked with rapid hardening cement block .

The improvement of the second technical solution is: a working platform is provided on other piles near the pile to be pulled out or on the soil around the pile to be pulled out.

Description of drawings

The present invention will be further described below in conjunction with accompanying drawing:

Fig. 1 is a schematic diagram of a pile pulling method and a pile pulling device used in the pile pulling system according to Embodiment 1 of the present invention.

Fig. 2 is a left side view of Fig. 1 .

Fig. 3 is a schematic diagram of anchor holes and static blast holes drilled on the pile to be pulled out in Fig. 1 .

detailed description

Embodiment one

The pile extraction method of the present embodiment, as shown in Fig. 1, Fig. 2 and Fig. 3, comprises the following steps:

1) After pretreatment, the top of the pile 1 to be pulled out is first exposed, and a plurality of high-strength anchor cable materials 2 and lifting equipment are equipped at the same time.

The pile 1 to be pulled out in this embodiment can be a friction pile buried in the soil, a partially rock-socketed end-bearing pile, or an occlusal pile buried at a certain depth below the ground surface, a cap pile, a driven pile, and the like. The heads of friction piles or end-bearing piles are exposed to the ground.

The anchor cable material 2 of this embodiment can be made of metal hard or soft material. Made of metal hard, such as: bonded steel strands, prestressed steel strands, prestressed steel strands, high-strength steel wires, high-strength steel wire ropes or high-strength steel bars, etc.; can also be made of non-metallic hard or soft materials , such as: fiber, plastic or nylon, etc.

2) Drill the anchor hole 1-1 extending to the bottom of the pile 1 to be pulled out; At least two anchor holes uniformly distributed around the center of the cross-section.

Anchor hole 1-1 of this embodiment is drilled using a crawler drill rig D150 with a single power of 75kW; it is also equipped with a 15m3, 1.3MPa air compressor with a power of 135kW. The working efficiency is 60m/8hr. After the hole is drilled, use clear water to clean the dry slurry, and drain the free water therein. Before lowering the anchor cable material 2, use a plug to block the hole to prevent foreign matter from entering the hole. If the pile body is still used as an engineering pile, in order to avoid damage to the pile body by the crawler drilling rig, a geological drilling rig can be used to drill holes. If the top surface of the pile body is below the surface, the pile center and diameter of the pile can be determined through investigation, and the anchor hole 1-1 is drilled by the casing method.

3) Put one end of the anchor cable material 2 down into the anchor hole 1-1, and the other end exposes the top of the pile 1 to be pulled out.

4) Pour grout into the anchor hole 1-1, and after the grout solidifies and reaches the set strength, fix the high-strength anchor cable material 2 in the pile 1 to be pulled out to form an anchor rod;

The depth of the anchor hole 1-1 of the present embodiment and the length of the anchor rod are less than the length of the pile 1 to be pulled and greater than the minimum anchor length of the anchor rod, and the minimum anchor length L of the anchor rod is calculated as follows:

In the formula, a is the safety factor; σ is the strength of the anchor cable material; A is the cross-sectional area of the anchor cable material; d is the diameter of the anchor hole; τ is the shear strength of the anchor rod and the hole wall.

5) The other end of the anchor cable material 2 is lifted by a hoisting device to pull up the pile 1 to be pulled out. Lifting equipment generally adopts the equipment that can be hoisted continuously or reciprocatingly to pull up the pile 1 to be pulled out.

In the present embodiment, in step 1), a working platform 3 is provided on other piles near the pile to be pulled out 1 or on the soil around the pile to be pulled out 1; the working platform 3 can be a reinforced concrete platform, a steel structure frame platform or a combination Structural platform, also can be caisson platform, etc.

In order to quickly decompose the concrete and realize the removal of the upper pile body of the pile to be pulled 1, the pile pulling project will be smoothly transferred to the next process and the next pile:

In the present embodiment, in step 2), a static blast hole 1-2 extending to the bottom of the pile 1 is drilled at the top;

In step 5) of this embodiment, after the other end of the anchor cable material 2 is lifted by the hoisting equipment to pull up the pile 1 to be pulled out, the breaker is first poured into the static blast hole 1-2 and the static blasting hole is blocked with rapid hardening cement. The blast hole 1-2 is opened for 12-18 hours, and then the pile body is broken by the crushing equipment. Static blast holes 1-2 are drilled in advance at the site to be demolished, and are distributed in a "ten" shape. The crushing agent adopts SCA-2 type (silent crushing agent), which is suitable for the environment of 10-25°C. Each bag is prepared with 5 kg of crushing agent and 1.5 liters of water. After stirring, ensure that the crushing agent is completely dissolved in water to form a slurry. The slurry must be poured into the static blast hole 1-2 within 10-15 minutes after stirring, filled to a distance of 15mm from the hole, pour the slurry into the hole and stir in the hole to ensure that there are no air holes in the drilled hole; After filling, plug the hole with rapid hardening cement; the effect can be achieved after 12-18 hours.

In order to be simple and reliable for the continuous uplifting of the pulling pile 1, in step 5) of this embodiment, the hoisting device is a through-hole jack 5 located on the working platform 3, and the through-hole jack 5 is installed and fixed on the reinforced concrete platform through the reaction force frame 4 , steel structure frame platform or combined structure platform; when the piles located below the ground surface as a whole need to be pulled out, the through-hole jack 5 is fixed on the caisson platform, and so on. The core-through jack 5 continuously tensions the other end of the anchor cable material 2 to continuously pull up the pile 1 to be pulled out. Through-hole jack method 5 realizes jacking, oil return and re-lifting through two sets of anchorages at the top and bottom of the jack cylinder, the top anchorage realizes the jacking function, and the bottom anchorage realizes the locking effect.

In order to ensure that the grouting is dense, the anchor cable material 2 of this embodiment is provided with three grouting pipes whose outlets are respectively located at the bottom, middle and upper part of the anchor hole 1-1; pressure grouting is used to inject grout into the anchor hole 1-1, The slurry is made by mixing PO52.5 cement, cement slurry channel grouting agent and water. The water-binder ratio of the slurry is 0.35-0.45; the mortar mixer and the grouting pump are used for pressure grouting. Before grouting, the mortar block production test can be carried out to ensure that the 3d strength of the test block reaches 25MPa, and the 10d strength reaches 30MPa.

Pressure grouting (injecting grout) is performed using a mortar mixer and a grouting pump. The grouting is grouted upwards from the bottom, and when it reaches the previous grouting pipe, open the previous grouting pipe until it reaches the designed position. Make 3 sets of cement slurry test blocks for each grouting, use mortar blocks, press the test blocks after 3 days and 7 days, and lift them after the strength is reached.

In step 5), before the pile is pulled out by the hoisting equipment, resistance reduction around the pile is carried out once. If the pile fails to be pulled out by the hoisting equipment, the resistance around the pile is eliminated for the second time, and the lifting success can also be achieved by adding the anchor cable material 2. In the process of pulling out piles by lifting equipment, gradually reducing the amount of lifting anchor cable materials can improve the lifting work efficiency.

The lifting equipment can use the reaction force frame. The height of the reaction force frame determines the height of the pile 1 that can be lifted at one time. The lifted part is broken, and the surrounding concrete of the anchor cable material 2 is cleaned, and then the secondary lifting is realized. Reciprocating, it can Reach the specified lifting height, or complete the lifting;

In step 5), if the lifting device fails to extract the pile, the anchor cable material is withdrawn by the anchor withdrawer. In order to avoid the failure of anchor withdrawal and cause broken wires of multiple anchor cable materials, an unloading sand bucket or a multi-layer sulfur resistance wire cushion is added between the base of the reaction frame and the top seat of the reaction frame to facilitate unloading of large loads; The ground beam of the reaction frame and the bottom of the base of the reaction frame are set with medium-coarse sand with a thickness of 10cm, and the surrounding area is protected with quick-hardening cement or sandbags. Before unloading, the sand at the bottom of the ground beam of the reaction frame is removed to achieve unloading. partial load action;

During the unloading process, if part of the anchor cable material is broken or otherwise damaged, the anchor cable material buried below the pile top can be broken to expose the concrete, and then the connector can be used to continue lifting.

As shown in Fig. 1, Fig. 2 and Fig. 3, the pile pulling system of this embodiment is used in the above-mentioned pile pulling method, and the pile pulling system is arranged near the pile to be pulled 1 fixed in the soil and exposed at the top. It includes multiple high-strength anchor cable materials 2 and lifting equipment.

The piles 1 to be pulled out in the pile pulling system of this embodiment are also friction piles buried in the soil, partly rock-socketed end-bearing piles, or occlusal piles, cap piles and driven piles buried at a certain depth below the surface. The heads of the piles or end-bearing piles are exposed to the ground.

The anchor cable material 2 in the pile pulling system of this embodiment is also made of metal hard or soft materials, such as: bonded steel strands, prestressed steel strands, prestressed steel strands, high-strength steel wires, high-strength steel wire ropes or high-strength steel strands. Steel bars, etc.; can also be made of non-metallic hard or soft materials, such as: fiber, plastic or nylon, etc.

The top of the pile to be pulled 1 is drilled with an anchor hole 1-1 extending to the bottom of the pile to be pulled. The anchor hole 1-1 in the pile pulling system of this embodiment is also one anchor hole located at the center of the cross section of the pile to be pulled 1 or at least two anchor holes uniformly distributed along the center circumference of the cross section of the pile to be pulled 1 .

One end of the anchor cable material 2 is arranged at the bottom of the anchor hole 1-1, and the other end of the anchor cable material 2 is exposed to the top of the pile 1 to be pulled out. The slurry in the pile 1 is used to form the anchor rod, and the lifting device is used to lift the other end of the anchor cable material 2 to pull up the pile 1 to be pulled out.

The depth of the anchor hole 1-1 and the length of the anchor rod in the pile pulling system of this embodiment are also less than the length of the pile to be pulled 1 and greater than the minimum anchor length of the anchor rod. The minimum anchor length L of the anchor rod is calculated as follows:

In the formula, a is the safety factor; σ is the strength of the anchor cable material; A is the cross-sectional area of the anchor cable material; d is the diameter of the anchor hole; τ is the shear strength of the anchor rod and the hole wall.

The top of the pile to be pulled out in the pile pulling system of this embodiment is formed with a static blasting hole 1-2 extending toward the bottom of the pile to be pulled out; the static blasting hole 1-2 is poured with breaking agent and sealed with rapid hardening Cement blocks.

In the pile pulling system of this embodiment, a working platform 3 is provided on other piles near the pile to be pulled 1 or on the 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 caisson platform, and the like.

The hoisting equipment in the pile pulling system of this embodiment is also the through-hole jack 5 located on the working platform 3, and the through-hole jack 5 is installed and fixed on the reinforced concrete platform, the steel structure frame platform or the combined structure platform through the reaction force frame 4; When it is necessary to pull out the pile that is located below the ground surface as a whole, the through-hole jack 5 is fixed on the caisson platform, and the like. The core-through jack 5 continuously tensions the other end of the anchor cable material 2 to continuously pull up the pile 1 to be pulled out.

The anchor cable material 2 is provided with three grouting pipes whose outlets are respectively located at the bottom, middle and upper part of the anchor hole 1-1.

Embodiment two

The pile extraction method of the present embodiment is an improvement on the basis of the first embodiment, and the difference with the first embodiment is:

The total length of the pile 1 to be pulled out that needs to be promoted in this embodiment is 24m, and the pile diameter is 1500mm. After calculation, the design load of the pile pulling force is 8000kN, and the check load is 10000kN.

In this way, the anchor cable material 2 adopts 4 bundles of CPS15A-12 type shear dispersion anchor cables. Each bundle of CPS15A-14 shear dispersion type anchor cable adopts 14-φ15.24 high-strength, low-relaxation steel strands with a tensile strength of 1860MPa.

The hoisting equipment of this embodiment still adopts the core-through jack 5, and selects four 4000kN core-through jacks 5 as the lifting power equipment. Considering the efficiency of 0.8, the total lifting capacity reaches 12800kN.

Before laying out the line, first compile the position of the reaction force frame 4 on the floor, and then determine the position of the anchor hole 1-1 according to the laying position of the reaction force frame 4. The anchor holes 1-1 of this embodiment are four anchor holes centered at the four corners of a square with a side length of 60 cm. The anchor holes 1-1 have a diameter of 150 mm, and the side lengths of the square are respectively parallel and perpendicular to the reaction force frame girder. .

Since the pile circumference is affected by connections such as retaining walls and canal walls, the crawler drilling rig D150 can be used to eliminate the connections through drilling. When this connection is eliminated, the drilling range should be appropriately increased and deepened to prevent large reaming and collapse of holes below the strong connection. Strong connection elimination selection was carried out at the same time as anchor hole 1-1.

The friction between the pile and the soil layer is partially eliminated by drilling a certain number of holes around the pile and flushing water properly to eliminate the friction around the pile. The lower diameter of the hole is 50PVC flower pipe, on the one hand to prevent the hole from collapsing, and on the other hand to refill the cement slurry around the pile after the lifting, to strengthen the soil around the pile, and to restore the role of the pile.

Pile pulling is divided into the following stages. The estimated lifting force is divided into 10 levels, each level is observed for 10 minutes, and the data is measured every minute to analyze the relationship between the displacement of the pile top with time and the change with load. Simultaneously monitor surface settlement displacement, structural stress and deformation. The estimated lifting force is 8000kN, and the specific load is graded as 800kN, 1600kN, 2400kN until the starting load.

In order to restore the function of the pile and reduce the adverse impact on the surrounding buildings, it is necessary to use cement slurry recharge. On the basis of building settlement observation, determine the recharge timing and recharge pressure. For building safety, recharge should be done sooner rather than later, and for the lifting of adjacent piles to have a compacting effect, it should be later rather than sooner. If the recharge pressure is too high, it will easily cause the surrounding buildings to rise. This time, the resistance reduction range is relatively small, and a low pressure recharge of no more than 1MPa is used. Using grouting equipment from bottom to top, the excess water around the pile will be discharged to the surface along the PVC flower tube; the grout will penetrate into the soil around the pile and connect the soil with the rest of the pile as a whole.

Embodiment three

The pile pulling method of this embodiment is an improvement on the basis of Embodiment 1 and Embodiment 2. The difference from the above embodiment is that in this embodiment, in step 5), the lifting device is located on the working platform 3 The crane or hoist, the crane or hoist continuously tensions the other end of the anchor cable material 2 to continuously pull up the pile 1 to be pulled out. The crane or winch is set 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 replacements fall within the scope of protection required by the present invention.

Claims (12)

1. a kind of pile extracting method, it is characterised in that comprise the following steps：

1) top exposed for treating pile pulling is first made through pre-treatment, while standby set many high intensity anchorage cable materials and lifting appliance；

2) treating to drill the anchor hole to the extension of its bottom at the top of pile pulling；

3) one end of the anchorage cable materials is transferred to the anchor hole, its other end, which exposes, to be treated at the top of pile pulling；

4) slurry is irrigated to the anchor hole, after the slurry solidifies and reaches setting intensity, by the high intensity anchorage cable materials Treat to form anchor pole in pile pulling described in being fixed on；

5) other end of the anchorage cable materials is lifted by lifting appliance and described treats pile pulling to pull up.

2. pile extracting method as claimed in claim 1, it is characterised in that：In the step 2) in, at the top for treating pile pulling Drill the static blasting hole extended to its bottom；In the step 5) in, the anchorage cable materials are being lifted by lifting appliance The other end first pours into cracking agent in static blasting hole and blocks static blasting hole with fast hydraulic cement to pull up after after pile pulling Aperture 12-18 hours, pile body is then carried out by disintegrating apparatus and crushed.

3. pile extracting method as claimed in claim 1 or 2, it is characterised in that：In the step 1) in, treated described near pile pulling Other stakes on or treat pile pulling periphery the soil body be provided with workbench；In the step 5) in, the lifting appliance is provided at Punching jack, loop wheel machine or hoist engine on workbench, the punching jack, loop wheel machine or hoist engine continue stretch-draw anchor material The other end of material described treats pile pulling with continuous pull up.

4. pile extracting method as claimed in claim 3, it is characterised in that：The workbench is reinforced concrete platform, steel knot Structure framework platform or combining structure platform；The punching jack is fixed on reinforced concrete platform, steel by reaction frame On structural framing platform or combining structure platform；The loop wheel machine or hoist engine are put down located at reinforced concrete platform, steel structure frame On platform or combining structure platform.

5. pile extracting method as claimed in claim 3, it is characterised in that：The workbench is open caisson platform, the punching thousand Jin top is fixed on open caisson platform.

6. pile extracting method as claimed in claim 1 or 2, it is characterised in that：The depth of the anchor hole and the length of anchor pole are less than The length for treating pile pulling and the least anchorage length for being more than the anchor pole, the least anchorage length L of the anchor pole are counted as the following formula Calculate：

$L\≥a\frac{\mathrm{\σ}*A}{\mathrm{\π}d\mathrm{\τ}}$

In formula, a is safety coefficient；σ is anchorage cable materials intensity；A is anchorage cable materials area of section；D is anchor hole diameter；τ is anchor pole With hole wall shearing strength.

7. pile extracting method as claimed in claim 1 or 2, it is characterised in that：The anchorage cable materials are located at respectively provided with outlet Three grout pipes at anchor hole bottom, middle part and top；Slurry is irrigated into anchor hole using pressure grouting, the slurry be by The slurry that PO52.5 cement, the agent of cement mortar hole path pressure grouting and water are mixed, the water-cement ratio of the slurry is 0.35~0.45；Adopt Pressure grouting is carried out with mortar mixer and grouting pump.

8. pile extracting method as claimed in claim 1 or 2, it is characterised in that：In the step 5) in, pulled out by lifting appliance Before stake, the resistance that once disappears in stake week is carried out, if after by lifting appliance pile pulling failure, carrying out the resistance that disappears in secondary stake week, if or by rising Hang after equipment pile pulling failure, anchor is moved back by anchor restorer progress anchorage cable materials.

9. pile extracting method as claimed in claim 1 or 2, it is characterised in that：In the step 5) in, pulled out by lifting appliance During stake, the quantity for lifting the anchorage cable materials is gradually reduced.

10. a kind of pile pulling system, the soil body is fixed on in the pile extracting method described in claim 1, the pile pulling system to be arranged at In and top exposed treat near pile pulling, including many high intensity anchorage cable materials and lifting appliance, it is characterised in that:It is described to wait to pull out The top of stake drills the anchor hole of the oriented bottom extension treated in pile pulling, and one end of the anchorage cable materials is located at the anchor hole bottom, The other end of the anchorage cable materials, which exposes, to be treated at the top of pile pulling, and being perfused with the anchor hole after solidification is used to consolidate the anchorage cable materials Due to treating in pile pulling to form the slurry of anchor pole, the other end that the lifting appliance is used to be lifted the anchorage cable materials is treated with pulling up Pile pulling.

11. pile pulling system as claimed in claim 10, it is characterised in that：It is described to treat to be formed with the top of pile pulling to treating in pile pulling The static blasting hole of bottom extension；Cracking agent has been poured into the static blasting hole and has been blocked fast hydraulic cement block.

12. pile pulling system as claimed in claim 10, it is characterised in that：In the other stakes treated near pile pulling or treat pile pulling The soil body on periphery is provided with workbench.