CN106968252A - Pile pulling recharge method and pile pulling recharge system - Google Patents

Abstract

The present invention relates to a kind of pile pulling recharge method and pile pulling recharge system, belong to stake in the engineerings such as water conservancy, highway, railway, municipal administration, bridge removes technical field.The pile pulling recharge method comprises the following steps：1）First make the top exposed for treating pile pulling through pre-treatment；2）Treating to drill anchor hole and pile body grout hole at the top of pile pulling；3）One end of anchorage cable materials is transferred to anchor hole bottom, its other end, which exposes, to be treated at the top of pile pulling；4）The first slurry is irrigated to anchor hole, anchorage cable materials are fixed on and treat to form anchor pole in pile pulling；5) pile pulling is treated to pull up by the other end of lifting appliance lifting anchorage cable materials, during pile pulling, passes through pile body grout hole the second slurry of recharge so that the second slurry penetrates into the pile peripheral earth for treating pile pulling bottom, and by the soil body and treats that pile pulling is linked as entirety.The pile pulling recharge method and pile pulling recharge system can fast and safely extract stake, play reduction lifting force, prevent landslide, improve success rate, and the stable effect of protection surrounding building underground structure.

Description

Pulling pile recharging method and pulling pile recharging system

technical field

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

Background technique

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

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.

At the same time, according to the applicant's knowledge, during the process of pulling out the pile, a cavity will be formed at the bottom of the pile replaced by a water body, and the loose soil around the cavity will easily collapse, destroying the function of the pile, and easily adversely affecting the surrounding buildings. The recharge of piles is carried out after the piles are pulled out.

It can be seen that in the existing pile pulling technology, the equipment requirements are high, the area is large, and the risk of using a large crane is high. Quick and safe pile pulling is still a problem, especially for large-diameter piles in a small space. At the same time, the recharge of the existing piles cannot guarantee the function of the original piles, and cannot protect the stability of the underground structure of the surrounding buildings.

Contents of the invention

The technical problem to be solved by the present invention is to propose a pile pulling refilling method and a pile pulling refilling system that can quickly and safely pull out piles of different diameters while ensuring the function of the piles.

One of the technical solutions proposed by the present invention to solve the above technical problems is: a method for pulling out piles and recharging, 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) drilling an anchor hole extending to the bottom of the pile to be pulled out at the top of the pile to be pulled out, and drilling a pile body grouting hole through the top surface and the bottom surface of the pile to be pulled out;

3) lowering one end of the anchor cable material to the bottom of the anchor hole, the other end of which is exposed to the top of the pile to be pulled out;

4) pouring the first slurry into the anchor hole, and after the first slurry solidifies and reaches a set strength, the anchor cable material is fixed 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, and during the process of pulling up the pile to be pulled out, refill the second slurry through the grouting hole of the pile body, so that the second slurry penetrates into the pile to be pulled out. Pull out the soil around the pile at the bottom of the pile, and connect the soil with the pile to be pulled out as a whole.

The second technical solution proposed by the present invention to solve the above technical problems is: a pile pulling recharge system, used in the above pile pulling refilling method, the pile pulling refilling system is set in the soil and the top is exposed Near the piles to be pulled out, comprising a plurality of high-strength anchor cable materials and lifting equipment, it is characterized in that: the top of the piles to be pulled out is formed with anchor holes extending toward the bottom of the piles to be pulled out, and the top of the piles to be pulled out is formed with There is a pile body grouting hole that runs through its top and bottom surfaces, one end of the anchor cable material is arranged at the bottom of the anchor hole, and the other end of the anchor cable material exposes the top of the pile to be pulled out; the anchor hole is filled with solidified Afterwards, it is used to fix the anchor cable material in the pile to be pulled out to form the first slurry of the 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, and the pile body is grouted The holes are used to refill the second slurry during pile extraction.

The present invention directly drills the anchor hole extending to the bottom of the pile to be pulled out on the top of the pile to be pulled out, and drills the pile body grouting hole through the top surface and the bottom surface of the pile to be pulled out, and then puts one end of the anchor cable material Lower to the bottom of the anchor hole, the other end of which exposes the top of the pile to be pulled out, then pour the first slurry into the anchor hole, fix the anchor cable material in the pile to be pulled out to form an anchor rod, and finally lift the anchor cable by lifting equipment The other end of the material is used to pull up the pile to be pulled out. During the process of pulling up the pile to be pulled out, the second slurry is refilled through the grouting hole of the pile body, which has the following effects:

1) Cleverly transfer the anchor rods in the existing geotechnical anchoring technology to pile pulling. Compared with the traditional thinking of pulling piles, which is to blindly pull the piles after their appearance is fixed, the present invention breaks through this The mindset is that the piles to be pulled out should be drilled first and then 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) to be pulled out, and at the same time reinforce the piles pulled out, which can effectively prevent piles from being pulled out and pull out large-diameter piles quickly and safely, 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.

2) By drilling the pile body grouting holes through the top and bottom surfaces of the piles to be pulled out, during the process of pulling up the piles to be pulled out, refilling the second slurry through the pile body grouting holes can ensure the structural safety of the piles , to protect the stability of the underground structure of surrounding buildings and prevent landslides. At the same time, it can balance the atmospheric pressure inside and outside, reduce the lifting force, and increase the success rate. It is particularly important that when only part of the pile needs to be pulled out, during the pile pulling process, the second slurry is refilled through the grouting hole of the pile body, so that the second slurry penetrates into the soil around the pile at the bottom of the pile to be pulled out body, and connect the soil body and the pile to be pulled out as a whole, so that the remaining piles that have not been fully pulled out can also be utilized.

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 pulling up the pile from the other end of the anchor cable material, 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 adopts the effect of the above-mentioned technical scheme: 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 hoisting device to pull up the pile, the static blast hole is firstly blasted. Pour the breaking agent into the hole and block the opening of the static blasting hole with quick-hardening cement for 12-18 hours, and then crush the pile body through the crushing equipment. Combined with concrete cutting and gas cutting steel bars, the concrete can be quickly decomposed to realize the pile The upper part is removed, and the pile pulling project is smoothly transferred 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 the present invention is particularly suitable for continuous pulling up of piles located below the ground surface by setting the caisson platform, 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 the first slurry into the anchor hole, and the The first slurry is a slurry formed by mixing PO52.5 cement, cement slurry channel grouting agent and water. The water-binder ratio of the first slurry is 0.35-0.45; the pressure is carried out by using a mortar mixer and a grouting pump. grouting.

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 the pile pulling and recharging method and the pile pulling device used in the pile pulling and recharging 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, pile body grouting holes and static blast holes drilled on the pile to be pulled out in Fig. 1 .

detailed description

Embodiment one

The method for pulling piles 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 is 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 surface, a cap pile and a driven pile, a friction pile or an end-bearing pile. The head of the pile is exposed to the surface.

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) An anchor hole 1-1 extending to the bottom of the pile to be pulled is drilled on the top of the pile to be pulled out, and a pile body grouting hole 1-2 is drilled on the pile to be pulled out through its top surface and bottom surface. The anchor hole 1-1 in this embodiment is 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 .

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 piles to be pulled are still used as engineering piles, in order to avoid damage to the piles by crawler drilling rigs, geological drilling rigs can be used to drill holes. If the top surface of the pile to be pulled 1 is below the surface, the pile center and diameter of the pile can be determined through investigation, and the anchor hole 1-1 and the pile body grouting hole 1-2 are drilled by the casing method.

3) One end of the anchor cable material 2 is lowered to the bottom of the anchor hole 1-1, and the other end is exposed to the top of the pile 1 to be pulled out, or the anchor is lowered to the anchor hole in the occlusal pile, cap pile or driven pile, etc. The other end of cable material 2 exposes the ground surface.

4) Pour the first slurry into the anchor hole 1-1, and after the first slurry solidifies and reaches the set strength, fix the anchor cable material 2 in the pile to be pulled out 1 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) Before pulling out, a large amount of water can be injected to soften the pile bottom of the pulling pile 1, balance the internal and external atmospheric pressure, etc., and then lift the other end of the anchor cable material 2 by lifting equipment to pull up the pile 1 to be pulled out. During the process of raising the pile 1 to be pulled out (in this embodiment, after the obvious vertical displacement is generated from the pulling up, it can be set to 10cm, and of course it can also be set to other sizes), the second grout is refilled through the pile body grouting hole 1-2 , so that the second slurry penetrates into the soil around the pile at the bottom of the pile to be pulled 1, and connects the soil with the pile to be pulled 1 as a whole.

The curtain grouting method can be applied to the recharging of piles to improve the quality of recharging; for the poor stability of the soil around the pile 1 to be pulled out, and the situation that it is close to the surrounding buildings, side pulling and side grouting, or even double grout liquid solidification can be used. Knot grouting.

For the multiple piles adjacent to pile 1 to be pulled out, in order to avoid connecting the adjacent piles during the grouting process and affecting the pulling out of the next pile, it is necessary to grout the same pile with the same pile.

In order to avoid the uplifting of the surrounding piles by recharging, the cementitious material with extremely low tensile and shear strength can be refilled, which only plays a filling role.

Commercial mortar is used for recharging by pump truck. For the grouting hole, an air outlet and water outlet pipe can be placed to the bottom of the pile, and the top of the pile can be quickly grouted through the funnel. When grouting, the water and air at the bottom of the pile are discharged from the top of the pile through the ventilation and water holes. Realize rapid and reliable grouting at the bottom of the pile.

In step 1) of the present embodiment, 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; 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 step 2) of this embodiment, a static blast hole 1-3 extending to the bottom of the pile 1 to be extracted 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, the breaker is first poured into the static blast hole 1-3 and the static blast hole 1 is blocked with rapid hardening cement. -3 orifice for 12-18 hours, and then the pile body is crushed by crushing equipment.

Static blast holes 1-3 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 1-3 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 pulling up of the pile 1, in step 5) of the present embodiment, the hoisting device is a through-hole jack 5 arranged on the working platform 3, and the through-hole jack 5 is installed and fixed on the reinforced concrete by the reaction force frame 4 platform, a steel structure frame platform or a combined structure platform; when it is necessary to pull out the piles located below the surface as a whole, 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.

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; the first grout is poured into the anchor hole 1-1 by pressure grouting , the first slurry is a slurry made by mixing PO52.5 cement, cement slurry channel grouting agent and water. The water-binder ratio of the first slurry is 0.35-0.45; the mortar mixer and 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. Of course, normal grouting pipes can also be used, and the first slurry can also be mortar or sand, and so on.

Pressure grouting (injection of the first slurry) is carried out using a mortar mixer and a grouting pump. The first grout is poured 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.

As shown in Fig. 1, Fig. 2 and Fig. 3, the pile pulling refilling system of this embodiment is used in the above-mentioned pile pulling refilling method. The vicinity of the pile 1 to be pulled includes a plurality of high-strength anchor cable materials 2 and lifting equipment.

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

The anchor cable material 2 of the pile pulling recharge system of the present embodiment can also be 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 rope or high-strength steel bar, etc.; also can be made of non-metal hard or soft material, such as: fiber, plastic or nylon, etc.

The top of the pile to be pulled 1 is formed with an anchor hole 1-1 extending to the bottom of the pile to be pulled, and the pile to be pulled 1 is formed with a pile body grouting hole 1-2 passing through its top surface and bottom surface, and the anchor cable material 2 One end of the anchor hole 1-1 is located at the bottom of the anchor cable material 2, and the other end of the anchor cable material 2 is exposed at the top of the pile to be pulled out; At least two anchor holes uniformly distributed around the center of the cross-section of the pulled pile 1 .

The anchor hole 1-1 is poured with the first slurry that is solidified and used to fix the anchor cable material 2 in the pile 1 to form the anchor rod, and the lifting device is used to lift the other end of the anchor cable material 2 to pull out the pile to be pulled out. Pulling out the pile 1, the pile body grouting holes 1-2 are used for refilling the second slurry during the pile pulling out process.

The depth of the anchor hole 1-1 and the length of the anchor rod of the pile pulling recharge system of this embodiment are also smaller 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 by the following 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 top of the pile 1 to be pulled out of the present embodiment is formed with a static blast hole 1-3 extending toward the bottom of the pile to be pulled out; the static blast hole 1-3 is poured with breaking agent and blocked with rapid hardening cement block.

In this embodiment, 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 hoisting device is a center-through jack 5 located on the working platform 3, and the working platform 3 is a reinforced concrete platform, a steel structure frame platform, a composite structure platform or a caisson platform, or the like.

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 is used for continuously tensioning 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 of the pile pulling refilling system of this embodiment is also 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 pulling method of the present embodiment is an improvement on the basis of the first embodiment, and the difference from 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 tube, on the one hand, to prevent the hole from collapsing, and on the other hand, when the second slurry is refilled through the grouting hole 1-2 of the pile body, the water at the bottom of the grouting hole of the pile body passes through the bottom of the grouting hole of the pile body from the pile. The top hole overflows; the second slurry penetrates into the soil around the pile at the bottom of the pile to be pulled out, connects the soil with the pile to be pulled out as a whole, strengthens the soil around the pile, and restores the function of the pile to be pulled out.

On the basis of building settlement observation, the recharge timing and recharge pressure can be determined. For building safety, recharging should be performed sooner rather than later, and for the lifting of adjacent piles to have a compacting effect, it should be later rather than earlier. 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.

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. Embodiment three

The pile extraction 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 adopts a The crane or winch on the platform 3 continuously pulls 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 (10)

1. A pile pulling method for recharging is characterized in that it may further comprise the 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) drilling an anchor hole extending to the bottom of the pile to be pulled out at the top of the pile to be pulled out, and drilling a pile body grouting hole through the top surface and the bottom surface of the pile to be pulled out; 3) lowering one end of the anchor cable material to the bottom of the anchor hole, the other end of which is exposed to the top of the pile to be pulled out; 4) pouring the first slurry into the anchor hole, and after the first slurry solidifies and reaches a set strength, the anchor cable material is fixed 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, and during the process of pulling up the pile to be pulled out, refill the second slurry through the grouting hole of the pile body, so that the second slurry penetrates into the pile to be pulled out. Pull out the soil around the pile at the bottom of the pile, and connect the soil with the pile to be pulled out as a whole. 2. pile pulling method for recharging as claimed in claim 1, is characterized in that: in described step 2), at the top of described pile to be pulled out, drill the static blast hole that extends toward its bottom; 5), after the other end of the anchor cable material is lifted by lifting equipment to pull up the pile, the breaker is first poured into the static blast hole and the opening of the static blast hole is blocked with rapid hardening cement for 12-18 hours, Then the pile body is crushed by crushing equipment. 3. The pile pulling recharge method according to claim 1 or 2, characterized in that: in the step 1), on other piles near the pile to be pulled or on the soil around the pile to be pulled There is a working platform; in the step 5), the hoisting device is a through-hole jack, a crane or a winch located on the working platform, and the other part of the continuous tensioning anchor cable material is provided by the through-hole jack, a crane or a winch. One end is to continuously pull up the pile to be pulled out. 4. The pile pulling recharge 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; On a concrete platform, a steel structure frame platform or a combined structure platform; the crane or winch is arranged on a reinforced concrete platform, a steel structure frame platform or a combined structure platform. 5. The pile pulling method according to claim 3, characterized in that: the working platform is a caisson platform, and the piercing jack is fixed on the caisson platform. 6. The pile pulling recharge method according to claim 1 or 2, characterized in that: 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 anchoring length of the anchor rod , the minimum anchorage length L of the anchor rod is calculated as follows: $\mathrm{<span\; class="notranslate">\; L</span>}<span\; class="notranslate">\; \&Greater\; Equal;</span>\mathrm{<span\; class="notranslate">\; a</span>}\frac{\mathrm{<span\; class="notranslate">\; \&sigma;</span>}<span\; class="notranslate">\; *</span>\mathrm{<span\; class="notranslate">\; A</span>}}{\mathrm{<span\; class="notranslate">\; \&pi;</span>}\mathrm{<span\; class="notranslate">\; d</span>}\mathrm{<span\; class="notranslate">\; \&tau;</span>}}$ 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. 7. The pile pulling method according to claim 1 or 2, wherein: the anchor cable material is provided with three grouting pipes whose outlets are located at the bottom, middle and upper part of the anchor hole; The first slurry is poured into the hole, the first slurry is a slurry formed by mixing PO52.5 cement, cement slurry hole grouting agent and water, and the water-binder ratio of the first slurry is 0.35-0.45 ; Use mortar mixer and grouting pump for pressure grouting. 8. A pile pulling refilling system, used in the pile pulling refilling method described in claim 1, the pile pulling refilling system is arranged near the piles to be pulled out that are fixed in the soil and exposed at the top, including a plurality of High-strength anchor cable material and lifting equipment, it is characterized in that: the top of described pile to be pulled out is shaped on the anchor hole that extends to the bottom in the pile to be pulled out, and the pile that runs through its top surface and bottom surface is shaped on described pile to be pulled out body grouting hole, one end of the anchor cable material is arranged at the bottom of the anchor hole, and the other end of the anchor cable material is exposed at the top of the pile to be pulled; The first slurry of the anchor rod is formed in the pile to be pulled out. The lifting device is used to lift the other end of the anchor cable material to pull up the pile to be pulled out. Fill the second slurry. 9. The pile pulling recharge system as claimed in claim 8, characterized in that: the top of the pile to be pulled is shaped on a static blast hole extending toward the bottom of the pile to be pulled; Breaking agent and blocked with rapid hardening cement blocks. 10. The pile pulling recharge system according to claim 8, characterized in that: a working platform is provided on other piles near the pile to be pulled or on the soil around the pile to be pulled.