Pile sinking construction method for anchor rod static pressure pile working well

Abstract

The invention discloses a pile sinking construction method for an anchor rod static pressure pile working well, and aims to provide the pile sinking construction method for the anchor rod static pressure pile working well, which is small in earth excavation area, and capable of effectively reducing the construction period, the engineering cost and the influence on the normal life of surrounding residents. The construction method comprises the following steps that firstly, a working well is constructed, the working well is divided into a plurality of sections from top to bottom, each section of working well serves as a construction cycle, all the sections of working well are sequentially constructed from top to bottom, and the working well is constructed to a cantilever raft; the construction of each section of working well comprises the following steps: excavating a well hole earth, and then constructing a reinforced concrete well wall; secondly, pile pressing holes are formed in the cantilever raft in the working well; thirdly, a pile pressing frame is installed; and then, anchor rod static pressure piles are constructed in the soil layer below the overhanging raft through the pile pressing holes.

Description

Technical Field

[0001] The invention relates to the technical field of pile supplementation and controlled sinking of existing buildings, and in particular to a pile sinking construction method for an anchor static pressure pile working well. Background Art

[0002] At present, the foundations of existing buildings with basements are buried deep. When uneven settlement or large settlement occurs, anchor static pressure piles are often used to control settlement and reinforce the foundation to control deformation. According to the actual distribution of settlement, the settlement control piles will be arranged around the wall limbs in the basement and on the cantilever raft slab outside.

[0003] When controlled piles are arranged outdoors, the current conventional practice is to use outdoor full excavation. Specifically, a circle of foundation pit support is set up outside the building, and pile construction is carried out after the earthwork is excavated to the cantilever raft surface. The above approach has the following disadvantages for existing buildings that have been delivered for use: First, large-scale earth excavation has a great impact on the environment around the building; second, the foundation pit support requires large-scale machinery and equipment for construction, but large-scale machinery and equipment are difficult to enter the existing building community, making the foundation pit support construction difficult; third, the construction period is long, the project cost is high, and it will increase the impact on the normal life of community residents.

[0004] In view of this, it is very important to design an outdoor non-full excavation anchor static pressure pile sinking method to solve a series of adverse effects brought about by outdoor full excavation, effectively reduce the construction period, project cost and the impact on the normal life of surrounding residents. Summary of the invention

[0005] The purpose of the present invention is to provide a pile sinking construction method for an anchor static pressure pile working well, which has a small earth excavation area and can effectively reduce the construction period, project cost and the impact on the normal life of surrounding residents.

[0006] The technical solution of the present invention is: A method for constructing a pile sinking in an anchor static pressure pile working well comprises the following steps in sequence: Step 1: Construction of the working well: Divide the working well into several sections from top to bottom. Each section of the working well is regarded as a construction cycle. The working wells are constructed in sequence from top to bottom until the working wells are constructed to the cantilever raft slab. The construction of each working shaft includes excavation of the shaft hole and then construction of reinforced concrete shaft wall; Step 2: Drill pressure pile holes for the cantilever raft slab in the working well; then, install the pressure pile frame; then, construct anchor static pressure piles in the soil layer below the cantilever raft slab through the pressure pile holes. A method for pile sinking of anchor static pressure piles in a working well of this scheme adopts a working well for pressure pile construction according to the actual distribution of the controlled sinking piles, and then drill pressure pile holes for the cantilever raft slab in the working well, then install the pressure pile frame; and construct anchor static pressure piles in the soil layer below the cantilever raft slab through the pressure pile holes. In this way, there is no need for large-scale earth excavation, nor is there any need for foundation pit support (correspondingly, no large-scale machinery and equipment is required for the construction of foundation pit support). The earth excavation area is small, which can effectively reduce the construction period, project cost and the impact on the normal life of surrounding residents. Therefore, it can effectively solve the series of adverse effects brought about by the outdoor comprehensive excavation construction of the controlled sinking piles of the existing building foundation with basement.

[0007] As a preferred embodiment, after the construction of the first working well at the top is completed, earthwork lifting equipment and a movable safety cover are installed at the wellhead, the earthwork lifting equipment includes a frame and a lifting sling arranged on the top of the frame, and a bucket is connected to the lifting rope of the lifting sling; In the subsequent excavation of the wellbore of each section of the working well, the earth is transported by earth-moving lifting equipment. During the transportation process, when the bucket is lifted to the set height above the wellhead, the movable safety cover is pushed to cover the wellhead, and then the bucket is unloaded. Then, the movable safety cover is opened and the bucket is lowered. In the actual construction process, the safety of the workers in the well is the top priority in the construction. In the process of unloading the earth by the bucket, this solution uses a movable safety cover to cover the wellhead to prevent the unloaded earth, stones and other debris from falling into the wellbore, causing safety accidents such as casualties of the workers, and effectively improve the safety of the workers.

[0008] Preferably, the earthwork lifting equipment further comprises a linkage shielding mechanism, which comprises: Mounting bracket, installed on the top of the rack; A vertical guide sleeve fixed on the mounting bracket and a hollow push rod slidably arranged in the vertical guide sleeve, a limit portion is arranged on the top of the hollow push rod; a lifting rope passes through the inner hole of the hollow push rod, and a pushing portion is arranged on the lifting rope below the hollow push rod; A rotating bracket is hinged on the mounting bracket, and one end of the rotating bracket is supported on the top of the vertical sliding sleeve under the action of its own weight; The movable safety cover includes a rotating cover. After the movable safety cover is opened, the upper part of the rotating cover abuts against the rotating bracket under the action of its own weight. When the bucket is lifted to the set height above the wellhead, the push part pushes the hollow push rod upward and drives the rotating bracket to rotate, thereby pushing the rotating cover plate to rotate through the rotating bracket, so that the rotating cover plate rotates downward under the action of its own weight and covers the wellhead. Although the use of movable safety cover plates to cover the wellhead can prevent the unloading of soil, stones and other debris from falling into the wellbore, in the actual construction process, due to the laziness of the operators and the trouble of opening and closing the movable safety cover plates, the operators often fail to operate according to the regulations and fail to push the movable safety cover plates to cover the wellhead according to the regulations before the bucket unloads the soil, resulting in the unloading of soil, stones and other debris falling into the wellbore, causing safety hazards such as casualties. In order to solve this problem, the present scheme further specially arranges a linkage shielding mechanism to ensure that when the bucket is lifted to a set height above the wellhead, the linkage shielding mechanism can automatically push the rotating cover plate to cover the wellhead; thereby avoiding the safety hazard that the operating personnel are lazy and think it is troublesome to operate the movable safety cover plate, and fail to push the movable safety cover plate to cover the wellhead as required before the bucket unloads the soil, resulting in soil blocks, stones and other debris falling into the wellbore during unloading, causing casualties to the operating personnel.

[0009] Preferably, step one also includes monitoring the hose construction, which includes, After the excavation of the wellbore of each section of the working well is completed, a vertically extending hose is laid on the inner wall of the wellbore, and at least part of the outer wall of the hose is embedded in the soil layer of the inner wall of the wellbore. The upper end of the hose extends above the wellhead, and the excess part of the lower part of the hose is curled and placed in the wellbore. Then the reinforced concrete well wall is constructed, so that a hose extending from the wellhead to the bottom of the well is laid on the outside of the reinforced concrete well wall; the lower end of the hose is closed, and the upper end of the hose is connected to a detachable sealing end cap, and a pressure sensor is provided on the sealing end cap to monitor the pressure in the hose, thereby monitoring the soil pressure changes outside the working well. In the actual construction process, the safety of workers in the well is the top priority in construction. After the construction of the working well in step one is completed, during the construction process in step two, the pressure sensor can be used to monitor in real time the pressure changes in the hose arranged on the outside of the reinforced concrete well wall. When the pressure in the hose increases, it means that the soil pressure acting on the hose from the outside increases, that is, the soil pressure acting on the reinforced concrete well wall of the working well from the outside also increases; based on this, the pressure sensor can be used to monitor the pressure changes in the hose to judge the changes in the soil pressure acting on the reinforced concrete well wall of the working well from the outside, thereby playing a role in timely warning.

[0010] Preferably, the number of the hoses is one or more, and the hoses are sequentially distributed along the circumference of the working well. In this way, the soil pressure changes around the working well can be effectively monitored in real time, further improving the safety of the workers in the well.

[0011] As a preferred method, the specific operation of constructing a reinforced concrete well wall is as follows: a wall protection template is installed on the inner wall of the well hole and steel bars are arranged. A steel ring is provided at the upper and lower ends of the inner side of the wall protection template as an inner support; then concrete is poured to form a reinforced concrete well wall. The cast-in-place reinforced concrete well wall can be closely combined with the soil wall, has good stability and overall performance, and is evenly stressed.

[0012] As a preferred method, the next section of the wellbore can be excavated only after the reinforced concrete wall of each section of the wellbore is solidified; after the excavation of the next section of the wellbore is completed, the previous section of the wall template is removed, and then the previous section of the wall template is installed on the inner wall of the next section of the wellbore. The wall template adopts the method of removing the upper section and supporting the lower section, and repeated turnover can effectively reduce the amount of wall template used and reduce construction costs.

[0013] Preferably, the steel bars in the reinforced concrete well wall include a plurality of vertically extending vertical bars and circularly distributed horizontal bars; the lap length of the vertical bars in the reinforced concrete well wall of two adjacent sections of the well bore inner wall is not less than 50 mm, and the vertical bars in the bottom section of the reinforced concrete well wall are embedded in the cantilever raft. In this way, the close connection between the reinforced concrete well walls of the two adjacent sections of the well bore inner wall is ensured, and the stability and integrity of the well bore inner wall are ensured.

[0014] Preferably, the reinforced concrete wall of the top first section working shaft is at least 200 mm above the ground, and the thickness of the reinforced concrete wall above the ground is 100-150 mm thicker than the other reinforced concrete walls.

[0015] Preferably, the method further includes step three: after the anchor static pile is sunk, backfilling the working well.

[0016] The beneficial effects of the present invention are: no large-scale earth excavation is required, and no foundation pit support construction is required (correspondingly, no large-scale mechanical equipment is required to construct the foundation pit support). The earth excavation area is small, which can effectively reduce the construction period, project cost and the impact on the normal life of surrounding residents. Therefore, it can effectively solve the current series of adverse effects caused by the outdoor comprehensive excavation construction of the controlled sinking piles of the existing building foundation with a basement. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a partial structural schematic diagram of an anchor static pressure pile working well pile sinking construction method after the working well and the anchor static pressure pile construction are completed.

[0018] Figure 2 yes Figure 1 Top view of the .

[0019] Figure 3 The present invention is a partial structural schematic diagram of an anchor static pressure pile working well pile sinking construction method during the working well construction process.

[0020] Figure 4 It is a partial structural schematic diagram after earthwork lifting equipment and a movable safety cover are installed at the wellhead of the working well of the present invention.

[0021] Figure 5 yes Figure 4 A partial enlarged view of point A in the middle.

[0022] In the figure: Working pit 1; Reinforced concrete shaft wall 2; Cantilever raft 3; Pressed pile hole 4; Anchor static pressure pile 5; Hose 6; Earthwork lifting equipment 7, frame 7.1, lifting rope 7.2, winding wheel 7.3, pushing part 7.4; Movable safety cover 8, rotating cover 8.1, base 8.2; Linkage shielding mechanism 9, mounting bracket 9.1, rotating bracket 9.2, rotating support rod 9.21, vertical support rod 9.22, support rod 9.23, counterweight block 9.3, vertical guide sleeve 9.4, hollow top rod 9.5, limiting part 9.6, lower protrusion 9.7. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments: Specific embodiment 1, as Figure 1 , Figure 2 , Figure 3 As shown, a method for pile sinking in an anchor static pressure pile working well comprises the following steps in sequence: Step 1: Work pit construction. The work pit 1 is divided into several sections from top to bottom. Each section of the work pit 1 is used as a construction cycle. The sections of the work pit 1 are constructed in sequence from top to bottom until the work pit 1 is constructed to the cantilever raft slab 3.

[0024] The construction of each section of the working shaft 1 includes excavation of the shaft hole and then construction of the reinforced concrete shaft wall 2.

[0025] Step 2, drilling pile holes 4 for the cantilever raft 3 in the working well 1; Next, a pile driving frame is installed in the working well 1; Next, anchor static pressure piles 5 are constructed in the soil layer below the cantilever raft 3 through the pile pressing frame and the pile pressing hole 4. The specific structure and pile sinking construction method of the anchor static pressure piles 5 are prior art, and their specific structure and pile sinking construction method are not the invention points of this application, so this application does not elaborate on the specific structure and pile sinking construction method of the anchor static pressure piles and other conventional technical means.

[0026] Step 3: After the anchor static pressure pile 5 is sunk, the working well 1 is backfilled.

[0027] According to the actual distribution of the controlled sinking piles, a method for pile sinking in a working well of an anchor rod static pressure pile in this embodiment adopts a working well 1 for pile sinking, and then a pile hole 4 is opened for the cantilever raft 3 in the working well 1, and then a pile frame is installed, and the anchor rod static pressure pile is constructed in the soil layer below the cantilever raft 3 through the pile frame and the pile hole 4. In this way, there is no need for large-scale earth excavation, and there is no need for foundation pit support (correspondingly, no large-scale mechanical equipment is required for the construction of foundation pit support). The earth excavation area is small, which can effectively reduce the construction period, project cost and the impact on the normal life of surrounding residents, and thus can effectively solve the series of adverse effects caused by the outdoor comprehensive excavation construction of the controlled sinking piles of the existing building foundation with basement.

[0028] Specific embodiment 2, as Figure 1 , Figure 2 , Figure 3 As shown, a method for pile sinking in an anchor static pressure pile working well comprises the following steps in sequence: Step 1: Work pit construction: divide the work pit 1 into several sections from top to bottom. Each section of the work pit 1 is used as a construction cycle. Each section of the work pit 1 is constructed from top to bottom in sequence until the work pit 1 is constructed to the cantilever raft 3. First, lay out the lines to determine the location of working well 1. According to the design drawings, determine the side lines of the location of working well 1, and then spread the lime line as the excavation dimension line of the well.

[0029] Next, each section of the working well 1 is constructed from top to bottom, with each section of the working well 1 as a construction cycle. The construction of each section of the working well 1 includes excavation of the well hole, and then construction of the reinforced concrete well wall 2. The height of each section of the working well 1 is 0.6-1.5 meters. In this embodiment, the height of the bottom section of the working well 1 is 1-1.2 meters, and the height of each of the remaining sections of the working well 1 is 0.6-1 meter.

[0030] Step 2, drilling pile holes 4 for the cantilever raft 3 in the working well 1; Next, a pile driving frame is installed in the working well 1; Next, anchor static pressure piles are constructed in the soil layer below the cantilever raft 3 through the pile pressing frame and the pile pressing hole 4. The specific structure and pile sinking construction method of the anchor static pressure pile are prior art, and the specific structure and pile sinking construction method are not the invention of this application, so this application does not elaborate on the specific structure and pile sinking construction method of the anchor static pressure pile and other conventional technical means.

[0031] Step 3: After the anchor static pile is sunk, backfill the working well 1.

[0032] According to the actual distribution of the controlled sinking piles, a method for pile sinking in a working well of an anchor rod static pressure pile in this embodiment adopts a working well 1 for pile sinking, and then a pile hole 4 is opened for the cantilever raft 3 in the working well 1, and then a pile frame is installed, and the anchor rod static pressure pile is constructed in the soil layer below the cantilever raft 3 through the pile frame and the pile hole 4. In this way, there is no need for large-scale earth excavation, and there is no need for foundation pit support (correspondingly, no large-scale mechanical equipment is required for the construction of foundation pit support). The earth excavation area is small, which can effectively reduce the construction period, project cost and the impact on the normal life of surrounding residents, and thus can effectively solve the series of adverse effects caused by the outdoor comprehensive excavation construction of the controlled sinking piles of the existing building foundation with basement.

[0033] Specifically, during the wellbore excavation process, the soil in the middle of the wellbore is excavated first, and then the surrounding soil is gradually expanded, thereby effectively controlling the cross-sectional size of the excavated wellbore.

[0034] Furthermore, the specific operation of constructing the reinforced concrete well wall 2 is as follows: a wall protection template is installed on the inner wall of the well hole and steel bars are arranged, and a steel ring is provided at the upper end and the lower end of the inner side of the wall protection template as an inner support. Then, concrete is poured to form the reinforced concrete well wall 2. The cast-in-place reinforced concrete well wall 2 can be closely combined with the soil wall, has good stability and overall performance, and is evenly stressed.

[0035] In this embodiment, the steel ring is made of channel steel or angle steel or other steel sections, and serves as the inner support of the inner side of the wall protection template to prevent the wall protection template from being deformed due to tension.

[0036] In this embodiment, after each section of the well hole is excavated, a reinforced concrete well wall 2 should be constructed. It is manually poured and compacted, and the concrete strength is C30, and the slump is controlled at 100mm to ensure the stability of the well wall.

[0037] Check the well position (center) axis: After each section of the wellbore wall is completed, the cross axis and elevation of the working well must be measured and set at the upper end of the reinforced concrete well wall; then, use the cross axis to align the center, and drop the hanging line to the bottom of the well. The uneven parts are then trimmed, and the well depth must be measured one by one based on the reference point. Ensure that the wellbore axis position, elevation, and cross-sectional dimensions meet the design requirements.

[0038] In order to ensure the verticality of the piles, the construction workers are required to check and the supervisors to review the center position and verticality once every three sections of reinforced concrete shaft walls are completed.

[0039] Furthermore, the next section of the wellbore can be excavated only after the reinforced concrete well wall 2 of each wellbore is solidified. After the excavation of the next section of the wellbore is completed, the previous section of the wall template is disassembled, and then the previous section of the wall template is installed on the inner wall of the next section of the wellbore. The wall template adopts the method of disassembling the upper section, supporting the lower section, and repeatedly using it, which can effectively reduce the amount of wall template used and reduce the construction cost.

[0040] Furthermore, the steel bars in the reinforced concrete shaft wall 2 include a number of vertically extending vertical bars and circularly distributed horizontal bars. The lap length of the vertical bars in the reinforced concrete shaft wall 2 of the inner wall of two adjacent sections of the wellbore is not less than 50 mm, that is, in two adjacent sections of the working well 1, the "vertical bars in the reinforced concrete shaft wall 2 of the inner wall of the upper section of the working well 1" extend downward into the "reinforced concrete shaft wall 2 of the inner wall of the lower section of the working well 1" with a lap length of not less than 50 mm. The vertical bars in the bottom section of the reinforced concrete shaft wall 2 are implanted in the cantilever raft 3. In this way, the close connection between the reinforced concrete shaft wall 2 of the inner wall of the two adjacent sections of the wellbore is ensured, and the close connection between the bottom section of the reinforced concrete shaft wall 2 and the cantilever raft 3 is ensured, thereby ensuring the stability and integrity of the inner wall of the wellbore.

[0041] Furthermore, the reinforced concrete shaft wall 2 of the first section of the working shaft 1 at the top is not less than 200 mm above the ground, and the thickness of the reinforced concrete shaft wall 2 above the ground is 100-150 mm thicker than the other reinforced concrete shaft walls 2. In this embodiment, the thickness of the reinforced concrete shaft wall 2 in the working shaft 1 is 120-200 mm.

[0042] Specific embodiment 3: The rest of the structure of this embodiment refers to specific embodiment 1 or specific embodiment 2, the difference is that: Step 1 also includes monitoring hose construction. Monitoring hose construction includes the following steps: like Figure 1 , Figure 2 , Figure 3 As shown, after the earthwork excavation of the wellbore of each section of the working well 1 is completed, a vertically extending hose 6 is laid on the inner wall of the wellbore. Part of the outer wall of the hose is embedded in the soil layer of the inner wall of the wellbore. The upper end of the hose 6 extends above the wellhead (after the wellbore earthwork excavation of the top first-stage working well 1 is completed, when the hose is laid out, the upper end of the hose is extended above the wellhead), and the excess part of the lower part of the hose is curled and placed in the wellbore; then the reinforced concrete well wall 2 is constructed. When the construction of the working well 1 is completed, a hose 6 extending from the wellhead to the bottom of the well is laid on the outside of the reinforced concrete well wall 2. In this embodiment, the hose is a rubber tube with a braided layer or a steel wire layer. The lower end of the hose is closed. A detachable sealing end cap is connected to the upper end of the hose. A pressure sensor is provided on the sealing end cap. The pressure sensor is used to monitor the pressure in the hose, thereby monitoring the soil pressure changes outside the working well 1.

[0043] In the actual construction process, the safety of workers in the well is the top priority in the construction. After the construction of the working well 1 in step one is completed, during the construction process in step two, the pressure sensor can be used to monitor the pressure changes in the hose arranged on the outside of the reinforced concrete well wall 2 in real time. When the pressure in the hose increases, it means that the soil pressure acting on the hose by the outside world increases, that is, the soil pressure acting on the reinforced concrete well wall 2 of the working well 1 by the outside world also increases; based on this, the pressure sensor can be used to monitor the pressure changes of the hose to judge the changes in the soil pressure acting on the reinforced concrete well wall 2 of the working well 1, thereby playing a role in timely warning.

[0044] When the pressure sensor used to monitor the pressure in the hose is greater than the set value, an alarm is sounded to remind the operator. The operator can take measures to reinforce the inner wall of the working well 1.

[0045] In one example, when the pressure sensor used to monitor the pressure in the hose is greater than the set value and an alarm is issued, the operator builds a steel support in the working well 1 to reinforce the inner wall of the working well 1.

[0046] In another example, a pressure relief port is provided on the sealing end cover, and a pressure relief valve is provided on the pressure relief port. When the pressure sensor used to monitor the pressure in the hose is greater than the set value and an alarm is issued, the operator slowly opens the pressure relief valve to slowly release the medium (gas or liquid medium) in the hose, thereby releasing the soil pressure in the soil layer where the hose is located, so as to relieve the soil pressure acting on the reinforced concrete wall 2 of the working shaft 1 from the outside.

[0047] In this embodiment, Figure 2 As shown, the number of the hose 6 is one or more. In this embodiment, the number of the hose 6 is multiple, and the multiple hoses are sequentially distributed along the circumference of the working well 1. In this way, the soil pressure changes around the working well 1 can be effectively monitored in real time, further improving the safety of the workers in the well.

[0048] Further, the sealing end cover is provided with a one-way injection nozzle. After the construction of the working well 1 in step 1 is completed, pressurized gas and pressurized liquid can be injected into the hose through the one-way injection nozzle to maintain a certain internal pressure in the hose.

[0049] Specific embodiment 4: The rest of the structure of this embodiment refers to specific embodiment 1 or specific embodiment 2 or specific embodiment 3, the difference is that: like Figure 3 , Figure 4 , Figure 5As shown, after the construction of the first section of the working shaft 1 at the top is completed, earth-moving lifting equipment 7 and a movable safety cover 8 are installed at the wellhead. The earth-moving lifting equipment 7 includes a frame 7.1 and a lifting sling arranged on the top of the frame 7.1. The lifting sling includes a winding wheel 7.3, a driving motor for driving the winding wheel 7.3, and a lifting rope 7.2 wound on the winding wheel 7.3. A bucket is connected to the lower end of the lifting rope 7.2 of the lifting sling. In this embodiment, a hook is provided at the lower end of the lifting rope 7.2, and the bucket is hung on the hook. The specific structure and method of the lifting sling are prior art, so this application does not elaborate on conventional technical means such as the specific structure and method of the lifting sling.

[0050] In the subsequent wellbore earth excavation construction of each section of the working well 1, the earth-moving lifting equipment 7 is used to transport the earth. During the earth-moving process, when the bucket is lifted to the set height above the wellhead, the movable safety cover 8 is pushed to cover the wellhead, and then the bucket is unloaded; then, the movable safety cover 8 is opened again, and the bucket is lowered. In the actual construction process, the safety of the workers in the well is the top priority in the construction. In the process of unloading the earth by the bucket, this solution uses the movable safety cover 8 to cover the wellhead to prevent the unloaded earth, stones and other debris from falling into the wellbore, which may cause safety accidents such as casualties to the workers, thereby effectively improving the safety of the workers.

[0051] Furthermore, the earth-moving lifting equipment 7 also includes a linkage shielding mechanism 9. The linkage shielding mechanism 9 includes a mounting bracket 9.1, a vertical guide sleeve 9.4 fixed on the mounting bracket 9.1, a hollow top rod 9.5 slidably arranged in the vertical guide sleeve 9.4, and a rotating bracket 9.2 hinged on the mounting bracket 9.1. In this embodiment, the frame 7.1 is a gantry. The mounting bracket 9.1 is installed on the top of the frame 7.1. In this embodiment, the mounting bracket 9.1 is installed on the top of the frame 7.1 by bolts. This facilitates the installation of the mounting bracket 9.1; at the same time, the linkage shielding mechanism 9 can be conveniently installed on the frame 7.1 through the mounting bracket 9.1.

[0052] A limiting portion 9.6 is provided at the top of the hollow mandrel 9.5. In this embodiment, a limiting plate or a limiting rod is provided at the top of the hollow mandrel 9.5. The hollow mandrel 9.5 slides downward along the vertical guide sleeve 9.4 until the limiting portion 9.6 abuts against the upper end of the vertical guide sleeve 9.4. A lower protrusion 9.7 is provided at the bottom of the outer wall of the hollow mandrel 9.5. The suspension rope 7.2 passes through the inner hole of the hollow mandrel 9.5. A pushing portion 7.4 is provided on the suspension rope 7.2 located below the hollow mandrel 9.5. In this embodiment, a rope knot is provided on the suspension rope 7.2, and the rope knot is located below the hollow mandrel 9.5, and the rope structure constitutes the pushing portion 7.4. Of course, the pushing portion 7.4 can also be composed of a stopper rod or a stopper fixed to the suspension rope 7.2.

[0053] One end of the rotating bracket 9.2 is supported on the top of the vertical sliding sleeve under the action of its own weight. In this embodiment, the rotating bracket 9.2 includes a rotating support rod 9.21 rotatably arranged on the mounting bracket 9.1, one end of the rotating support rod 9.21 is supported on the top of the vertical sliding sleeve, the other end of the rotating support rod 9.21 is provided with a vertical support rod 9.22 extending downward, and the lower end of the vertical support rod 9.22 is provided with a support rod 9.23. In order to ensure that one end of the rotating bracket 9.2 is supported on the top of the vertical sliding sleeve under the action of its own weight, in this embodiment, a counterweight block 9.3 is also provided on one side of the rotating support rod 9.21 close to the vertical sliding sleeve.

[0054] The movable safety cover 8 includes a base 8.2 and a rotating cover 8.1. The base 8.2 is placed on the surface of the wellhead of the working well 1. The rotating cover 8.1 is rotatably arranged on the base 8.2. After the movable safety cover 8 is opened, the upper part of the rotating cover 8.1 abuts against the rotating bracket 9.2 under the action of its own weight. Specifically, the upper part of the rotating cover 8.1 abuts against the support rod 9.23 of the rotating bracket 9.2 under the action of its own weight; at this time, the angle between the rotating cover 8.1 and the surface where the wellhead of the working well 1 is located is greater than 90 degrees.

[0055] When the bucket is lifted to a set height above the wellhead, the pushing part 7.4 pushes the hollow push rod 9.5 upward and drives the rotating bracket 9.2 to rotate, thereby pushing the rotating cover plate 8.1 to rotate through the rotating bracket 9.2, so that the rotating cover plate 8.1 rotates downward under the action of its own weight and covers the wellhead.

[0056] Although the use of a movable safety cover 8 to cover the wellhead can prevent clods of soil, rocks and other debris from falling into the wellbore during unloading, during the actual construction process, due to the laziness of the operators, the operators often fail to operate in accordance with the specifications and fail to push the movable safety cover 8 to cover the wellhead before the bucket unloads the soil, resulting in clods of soil, rocks and other debris from unloading falling into the wellbore, causing safety hazards such as casualties to the operators. In order to solve this problem, the present embodiment further specifically provides a linkage shielding mechanism 9 to ensure that when the bucket is lifted to a set height above the wellhead, the linkage shielding mechanism 9 can automatically push the rotating cover 8.1 so that the rotating cover 8.1 covers the wellhead, thereby avoiding the problem that the operators are lazy and find it troublesome to open and close the movable safety cover 8, and fail to push the movable safety cover 8 to cover the wellhead before the bucket unloads the soil, resulting in safety hazards such as clods of soil, rocks and other debris from unloading falling into the wellbore, causing safety hazards such as casualties to the operators. Specifically, When using the earthwork lifting equipment 7 to transport earth, the driving motor drives the winding wheel 7.3 to rotate and reel in the lifting rope 7.2 to lift the bucket upward. When the bucket is lifted to a set height above the wellhead, the pushing portion 7.4 abuts against the lower end of the hollow push rod 9.5 to push the hollow push rod 9.5 upward along the vertical guide sleeve 9.4. In the process of the hollow push rod 9.5 being pushed upward along the vertical guide sleeve 9.4, the hollow push rod 9.5 will drive the rotating bracket 9.2 to rotate, thereby pushing the rotating cover plate 8.1 to rotate toward the wellhead of the working well 1 through the rotating bracket 9.2. When the rotating cover plate 8.1 rotates a certain angle toward the wellhead of the working well 1, the rotating cover plate 8.1 will rotate downward under the action of its own weight and cover the wellhead. In this way, it is ensured that when the bucket is lifted to the set height above the wellhead, the rotating cover plate 8.1 can be automatically pushed by the linkage shielding mechanism 9 to make the rotating cover plate 8.1 cover the wellhead; thereby avoiding the problem that the operating personnel are lazy and think it is troublesome to operate the opening and closing movable safety cover plate 8, and fail to push the movable safety cover plate 8 to cover the wellhead as required before the bucket unloads the soil, resulting in the unloading of soil, stones and other debris falling into the wellbore, causing safety hazards such as casualties to the operating personnel.

[0057] After the bucket is unloaded, the driving motor drives the winding wheel 7.3 to lower the lifting rope 7.2, so that the bucket moves down a distance until the limit portion 9.6 abuts against the upper end of the vertical guide sleeve 9.4 (in this process, one end of the rotating bracket 9.2 is supported on the top of the vertical sliding sleeve under the action of its own weight), so that the rotating bracket 9.2 is reset; then, the driving motor stops working; then, the movable safety cover 8 is opened, so that the upper part of the rotating cover 8.1 abuts against the rotating bracket 9.2 under the action of its own weight; then, the driving motor continues to drive the winding wheel 7.3 to lower the lifting rope 7.2 and the bucket.

[0058] In this embodiment, the movable safety cover also includes a torsion spring arranged on the rotating shaft of the rotating cover 8.1. When the rotating cover 8.1 rotates downward under the action of its own weight and covers the wellhead, the force of the torsion spring on the rotating cover acts as a buffer, thereby preventing the rotating cover from hitting the wellhead ground too quickly.

[0059] In this embodiment, there are two movable safety covers 8, and the two movable safety covers 8 are symmetrically distributed on both sides of the wellhead of the working well 1. There are two rotating brackets 9.2, and the rotating brackets 9.2 correspond to the movable safety covers 8 one by one. After the movable safety covers 8 are opened, the upper part of the rotating cover 8.1 rests on the support rod 9.23 of the corresponding rotating bracket 9.2 under the action of its own weight.

[0060] Of course, it should be noted that the movable safety cover 8 can also be a single piece. The rotating bracket 9.2 corresponds to the movable safety cover 8 one by one.

[0061] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent transformation made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for pile sinking in an anchor static pressure pile working well, characterized in that: The following steps are included in sequence: Step 1: Construction of the working well: Divide the working well into several sections from top to bottom. Each section of the working well is regarded as a construction cycle. The working wells are constructed in sequence from top to bottom until the working wells are constructed to the cantilever raft slab. The construction of each working shaft includes excavation of the shaft hole and then construction of reinforced concrete shaft wall; Step 2: drilling pile holes for the cantilever raft slab in the working well; then, installing the pile pressing frame; and then, constructing anchor static piles in the soil layer below the cantilever raft slab through the pile pressing holes.

2. The method for pile sinking in an anchor static pile working well according to claim 1 is characterized in that: After the construction of the first working shaft at the top is completed, earthwork lifting equipment and movable safety cover are installed at the wellhead. The earthwork lifting equipment includes a frame and a lifting sling arranged on the top of the frame, and a bucket is connected to the lifting rope of the lifting sling; In the subsequent wellbore excavation construction of each section of the working shaft, earth-moving lifting equipment is used to transport earth. During the earth-moving process, when the bucket is lifted to the set height above the wellhead, the movable safety cover is pushed to cover the wellhead, and then the bucket unloads the earth. Then, the movable safety cover is opened and the bucket is lowered.

3. The method for pile sinking in an anchor static pile working well according to claim 2 is characterized in that: The earthwork lifting equipment also includes a linkage shielding mechanism, which includes: Mounting bracket, installed on the top of the rack; A vertical guide sleeve fixed on the mounting bracket and a hollow push rod slidably arranged in the vertical guide sleeve, a limit portion is arranged on the top of the hollow push rod; a lifting rope passes through the inner hole of the hollow push rod, and a pushing portion is arranged on the lifting rope below the hollow push rod; A rotating bracket is hinged on the mounting bracket, and one end of the rotating bracket is supported on the top of the vertical sliding sleeve under the action of its own weight; The movable safety cover includes a rotating cover. After the movable safety cover is opened, the upper part of the rotating cover abuts against the rotating bracket under the action of its own weight. When the bucket is lifted to a set height above the wellhead, the pushing part pushes the hollow push rod upward and drives the rotating bracket to rotate, thereby pushing the rotating cover plate to rotate through the rotating bracket, so that the rotating cover plate rotates downward under the action of its own weight and covers the wellhead.

4. A method for pile sinking in an anchor static pile working well according to claim 1, 2 or 3, characterized in that: Step one also includes monitoring the hose construction, which includes, After the excavation of the wellbore of each section of the working well is completed, a vertically extending hose is laid on the inner wall of the wellbore, and at least a part of the outer wall of the hose is embedded in the soil layer of the inner wall of the wellbore, the upper end of the hose extends above the wellhead, and the excess part of the lower part of the hose is curled and placed in the wellbore, and then the reinforced concrete well wall is constructed, so that a hose extending from the wellhead to the bottom of the well is laid on the outside of the reinforced concrete well wall; the lower end of the hose is closed, and a detachable sealing end cover is connected to the upper end of the hose, and a pressure sensor is provided on the sealing end cover to monitor the pressure in the hose, thereby monitoring the changes in soil pressure outside the working well.

5. The method for pile sinking in an anchor static pile working well according to claim 4 is characterized in that: The number of the hoses is one or more, and the multiple hoses are distributed in sequence along the circumference of the working well.

6. A method for pile sinking in an anchor static pile working well according to claim 1, 2 or 3, characterized in that: The specific operations for constructing reinforced concrete shaft walls are as follows: A retaining wall formwork is installed on the inner wall of the wellbore and steel bars are laid. A steel ring is provided at the upper and lower ends of the inner side of the retaining wall formwork as inner support; then concrete is poured to form a reinforced concrete wellbore wall.

7. The method for pile sinking in an anchor static pressure pile working well according to claim 6 is characterized in that: The next wellbore earthwork can only be excavated after the reinforced concrete wall of each wellbore has solidified. After the excavation of the next section of the wellbore is completed, the previous section of the retaining wall template is removed, and then the previous section of the retaining wall template is installed on the inner wall of the next section of the wellbore.

8. A method for pile sinking in an anchor static pile working well according to claim 1, 2 or 3, characterized in that: The steel bars in the reinforced concrete well wall include a number of vertically extending vertical bars and circularly distributed horizontal bars; the lap length of the vertical bars in the reinforced concrete well wall of two adjacent sections of the wellbore inner wall is not less than 50 mm, and the vertical bars in the bottom section of the reinforced concrete well wall are embedded in the cantilever raft slab.

9. A method for pile sinking in an anchor static pile working well according to claim 1, 2 or 3, characterized in that: The reinforced concrete wall of the first section of the working shaft at the top is not less than 200mm above the ground, and the thickness of the reinforced concrete wall above the ground is 100-150mm thicker than the other reinforced concrete walls.

10. A method for pile sinking in an anchor static pile working well according to claim 1, 2 or 3, characterized in that: It also includes step three: after the anchor static pressure pile is sunk, backfill the working well.

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