Steel sheet pile construction method based on double-layer guide frame auxiliary positioning

Abstract

The invention discloses a steel sheet pile construction method based on double-layer guide frame auxiliary positioning, and relates to the technical field of sheet pile wharf construction. Comprising the following steps that firstly, construction preparation is conducted, specifically, the driving axis and the driving position of a steel sheet pile are measured and marked according to drawing data; 2, a guide frame is installed and adjusted, specifically, a double-layer guide frame is selected, and the double-layer guide frame is installed and adjusted according to a construction drawing; and thirdly, steel sheet pile inserting and driving are conducted, specifically, the steel sheet pile is inserted into the guide frame to be positioned, and pile sinking operation of the steel sheet pile is conducted through pile sinking equipment. According to the construction method, the positioning stability of the guide frame on the steel sheet pile can be ensured, meanwhile, the double-layer opening type guide frame is used for conducting double positioning and adjustment on the steel sheet pile before pile sinking, the perpendicularity of the steel sheet pile can be kept accurate during pile sinking construction, and the pile sinking construction efficiency and the engineering quality of the steel sheet pile can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of sheet pile wharf construction, and in particular to a steel sheet pile construction method based on double-layer guide frame auxiliary positioning. Background Art

[0002] As one of the basic structures of sheet pile wharf, the front wall steel sheet pile foundation is widely used in wharf structure construction due to its low cost, high strength and good water-stopping performance. In order to control the axis position of the sheet pile wall, ensure the verticality of the pile body and prevent the pile body from twisting, it is necessary to set up guide beams and guide frames during the steel sheet pile construction process to assist in the positioning of the steel sheet pile construction and ensure that the plane position of the steel sheet pile foundation meets the design requirements. This is an indispensable setting and measure for sheet pile sinking construction.

[0003] However, in the current steel sheet pile construction process, a single-layer guide frame is mainly used to assist in the positioning of the steel sheet piles. Due to the large length of a single pile and the long longitudinal driving length, it is difficult to measure the verticality and lateral inclination; and the one-way frame with a single-layer structure cannot be adjusted according to the size of the steel sheet pile, which limits its application scope and effect. At the same time, since there is no corresponding construction method nowadays, it mainly relies on the workers' experience and judgment, which not only reduces the construction efficiency of the steel sheet piles, but also affects the construction quality of the steel sheet piles due to the inaccurate and unstable installation position of the conductor frame. For this reason, a steel sheet pile construction method based on double-layer guide frame assisted positioning is proposed. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a steel sheet pile construction method based on double-layer guide frame assisted positioning, which solves the problem that the current construction method using a single-layer guide frame to assist in steel sheet pile positioning is difficult to measure the verticality and inclination of steel sheet pile construction, and cannot be adjusted according to the size of the steel sheet pile, thus affecting the construction efficiency and construction quality.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A steel sheet pile construction method based on double-layer guide frame auxiliary positioning, comprising the following steps:

[0006] Step 1, construction preparation: according to the control points of the piles handed over by the design unit, establish the site control network, and measure and mark the axis and location of the steel sheet piles according to the drawing data;

[0007] Step 2: Installation and adjustment of the guide frame: Select a double-layer guide frame, install and adjust the double-layer guide frame according to the construction drawings, make the verticality and stability of the double-layer guide frame meet the design requirements, and make the size of the double-layer guide frame match that of the steel sheet pile;

[0008] Step three, driving the steel sheet piles: insert the steel sheet piles into the guide frame for positioning, use pile driving equipment to drive the steel sheet piles, and pay attention to the verticality and plane position deviation of the steel sheet piles during the pile driving operation, and make timely adjustments when the deviation of the verticality and plane position of the steel sheet piles exceeds the allowable range.

[0009] Preferably, in step 1, the construction preparation specifically includes the following steps:

[0010] S101. Conduct an environmental survey of the construction site before construction to understand the geological conditions, hydrological conditions and surrounding environment of the construction site, and select suitable equipment for steel sheet pile settlement construction based on the survey results. The construction equipment includes but is not limited to 180t crawler crane, 55t crawler crane and hydraulic vibratory hammer;

[0011] S102, pre-grouping the plurality of steel sheet piles in pairs, and using a double-clamp fixture to splice and fix two steel sheet piles in the same group, so that the steel sheet piles are driven in a whole-group construction manner;

[0012] S103, clean up the construction site so that the surface soil bearing capacity of the construction site meets the construction requirements, introduce site control points according to the control points of the piles assigned by the design unit, and take measures for site precipitation and drainage. Establish a site control network according to the site control points of the construction site, and measure and lay out the steel sheet pile driving axis according to the drawing data, and mark the steel sheet pile driving position with white lime;

[0013] S104, in order to control the axis position of the sheet pile wall, ensure the verticality of the pile body and improve the penetration capacity of the steel sheet pile, and prevent the twisting deformation of the pile body during the injection of the steel sheet pile, a guide frame with sufficient rigidity and strength is set.

[0014] Preferably, in 101, understanding the geological conditions, hydrological conditions and surrounding environment of the construction site specifically includes:

[0015] Find out the formation age, structural characteristics of the strata, physical and mechanical properties and spatial distribution characteristics of the foundation soil layer, evaluate the bearing capacity and stability of the foundation soil layer, and provide a basis for selecting the appropriate pile type and pile length;

[0016] Analyze the groundwater level, find out the type, depth and burial conditions of groundwater in the site, provide the basic law of groundwater level dynamic change, and the recommended values ​​of steel sheet pile anti-floating design water level and anti-seepage design water level, and then evaluate the impact of groundwater on the construction process, and provide data support for site precipitation or drainage measures;

[0017] Verify the distribution and condition of buildings, roads, underground pipelines and other facilities around the construction site, assess the possible impact of construction activities on the surrounding environment, such as noise, vibration, settlement, etc., and formulate corresponding mitigation measures.

[0018] Preferably, in S104, the guide frame used is a double-layer open guide beam double-sided form, the upper and lower guide beams on the guide frame are rigidly connected, the guide frame is connected to four anchor piles, and adjustable guide wheels are installed on the upper and lower transverse and longitudinal beams of the guide frame to control and adjust the deviation, inclination and verticality of the steel sheet piles.

[0019] Preferably, in step 2, the installation and adjustment of the guide frame specifically includes the following steps:

[0020] S201, the guide frame is hoisted horizontally with four lifting points, each lifting point adopts a jointless wire rope loop, and is hoisted with a 180t crawler crane. The guide frame platform is moved to the specified position by adjusting the boom, and the central axis of the bottom of the guide frame platform is ensured to coincide with the central axis of the steel sheet pile, and the guide frame platform is lowered to the construction site;

[0021] S202, use a 180t crawler crane to lift the vibratory hammer, clamp the fixture on the pile clamping wing plate on the top of the positioning pile, vertically lift the vibratory hammer and the positioning pile, perform the positioning pile sinking operation at the corresponding pile position, and pull out the positioning pile for turnover use after the pile sinking operation;

[0022] S203, after the positioning piles are sunk, use a plumb bob to lower the center line of both ends of the upper steel sheet pile guide groove on the guide frame platform, measure the distance between the plumb bob and the upper and lower guide groove edges, adjust the verticality and horizontality of the guide frame by lifting the auxiliary iron block on one side, and use a level to measure the elevation of the bottom of the guide pile groove to verify, to ensure that the guide frame platform remains horizontal and the steel sheet piles can be vertically inserted into the groove. After the adjustment is completed, weld the guide frame to the four positioning piles, regularly check the three-dimensional marking lines pre-made on the guide frame, and when verifying the horizontal line, control the deviation value of ±10mm within the allowable error range.

[0023] Preferably, in S202, the sinking of the positioning piles is specifically:

[0024] The position marked with white lime in S103 is the location for the positioning piles;

[0025] Install the clamp on the clamping part of the vibrating hammer, make sure the clamp is firmly connected to the vibrating hammer, then open the clamp arm to clamp the clamping wing plate on the top of the positioning pile;

[0026] Start the 180t crawler crane to lift the vibrating hammer and the positioning pile together, adjust the boom angle and position of the crawler crane, so that the vibrating hammer and the positioning pile accurately correspond to the marked position of the pile and the verticality and inclination of the positioning pile;

[0027] Start the vibration device of the vibratory hammer, and gradually sink the positioning pile into the soil layer through the impact force generated by the vibration. During the pile sinking process, it is necessary to pay attention to the vibration frequency and amplitude of the vibratory hammer as well as the sinking speed and amount of the positioning pile. If the positioning pile is deflected or the sinking speed is abnormal, timely adjustments should be made to ensure that the positioning pile sinks vertically into the soil layer to a sufficient depth.

[0028] Preferably, in step 3, the steel sheet pile driving specifically includes the following steps:

[0029] S301, two steel wire ropes are hung on the main hook of the 55t crawler crane, and the other end is connected to the two lifting holes on the top of the steel sheet pile through a shackle. The hook is slowly raised to turn the steel sheet pile over and set up the column, and then the hook is slowly lowered to make the steel sheet pile enter the guide frame for preliminary adjustment of the steel sheet pile posture and self-sinking;

[0030] S302, use a 180t crawler crane to lift the vibrating hammer to clamp the pile. Under the control of the horizontal and vertical total station, adjust the crawler crane rod, hook head, hammer body and pile center to the same straight line left and right, front and back. Then, under the force of the hook, the vibrating hammer slowly drops the hook and vibrates and sinks. Fine-tune the position and verticality of the steel sheet pile for positioning. Then, install limit stops on both sides of the upper and lower pile bodies of the guide frame. In each pile position, the coordinates of the pile core where the steel sheet pile is expected to be inserted are released. The position where the guide wheel should be adjusted is calculated and measured. The preset pile core is tested and the verticality of the steel sheet pile is further finely adjusted by adjusting the guide wheel on the guide frame platform.

[0031] S303, hoist the vibrating hammer, use the clamp to clamp the top of the steel sheet pile, and after clamping, start the vibrating hammer. Under the force of the hook, the vibrating hammer slowly drops the hook and vibrates. During the initial driving of the steel sheet pile, monitor the verticality change of the pile body. Use two total stations at 90 degrees to control the position and verticality of the steel sheet pile using the intersection method. During the pile sinking process, use the monitoring system to monitor the verticality and deviation of the steel sheet pile during the vibration and insertion process, and make timely adjustments when the steel sheet pile is deviated;

[0032] S304, after the first pile is vibrated and sunk to 4m above the guide frame platform and the 55t crawler crane is turned over and the pile is erected, the 180t crawler crane uses double chucks to clamp the pile, and cooperates with the cable wind rope or hand winch to adjust the spacing between the auxiliary pile tip locks, and aligns the pile tip locks with the pile top locks of the adjacent auxiliary piles to make grooves. After the grooves are made, adjust the hook, confirm that the verticality of the hammer body and the pile body is correct, start the vibrating hammer, and slowly drop the hook while maintaining a certain lifting force, so that the steel sheet pile vibrates and sinks to 4m above the guide frame platform. Repeat the above operation to vibrate and sink 6-7 piles, release the guide frame limit and proceed to the next machine position construction until all the steel sheet piles are fully sunk and positioned.

[0033] Preferably, in S304, the initial driving of the steel sheet piles at the subsequent machine positions adopts a "root-by-root construction method", and the specific operations are as follows:

[0034] Using the above steel sheet pile as the construction guide, the locking and groove of the steel sheet pile are carried out in sequence. After completion, the vibrating hammer is lifted to clamp the pile and vibrate and sink it. After completing the initial driving of 6 groups of steel sheet piles in sequence, the guide frame limit is released and the machine is moved to the next position for construction.

[0035] Preferably, after the steel sheet pile inserting step is completed, the guide frame platform disassembly step is specifically as follows:

[0036] Hang the lifting sling on the guide frame platform, cut off the connection between the guide frame platform and the positioning pile on one side, lift the guide frame slowly, ensure that there is no interference with the vibrated steel sheet pile, move it along the direction of the sunk pile and use the axis of the sunk pile to position the guide frame. When the guide frame is pulled out of or inserted into the vibrated main pile, keep the guide frame stable as a whole, lift or drop it slowly, and prevent the guide groove from colliding strongly with the body of the driven main pile and causing deformation.

[0037] Preferably, in S303, when the steel sheet pile is misaligned during the vibration and insertion process and the crawler crane cannot adjust the pile position deviation, if the length of the steel sheet pile above the ground is greater than or equal to half of the length of the steel sheet pile, the steel sheet pile is pulled up by the crawler crane, and the steel sheet pile is vibrated and inserted again according to the S303 step; if the length of the steel sheet pile above the ground is less than half of the length of the steel sheet pile, the deviation of the steel sheet pile is corrected by adjusting the vibration frequency and strength of the vibrating hammer.

[0038] The present invention discloses a steel sheet pile construction method based on double-layer guide frame auxiliary positioning, which has the following beneficial effects:

[0039] The steel sheet pile construction method based on the auxiliary positioning of the double-layer guide frame can ensure the stability of the steel sheet pile positioning by the guide frame. At the same time, the double-layer open guide frame is used to perform double positioning and adjustment on the steel sheet piles before pile sinking, so that the steel sheet piles can maintain accurate verticality during pile sinking construction. Therefore, the steel sheet piles can not only adapt to stable vertical pile sinking in complex environments, but also maintain the verticality of the pile sinking process and the deviation of the pile top plane position accurately, which can effectively improve the efficiency of steel sheet pile sinking construction and the quality of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0041] Figure 1 The present invention is a flow chart of a steel sheet pile construction method based on double-layer guide frame auxiliary positioning. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] The embodiment of the present application provides a steel sheet pile construction method based on double-layer guide frame assisted positioning, which solves the problem that the current construction method using single-layer guide frame to assist in steel sheet pile positioning is difficult to measure the verticality and inclination of steel sheet pile construction, and cannot be adjusted according to the size of steel sheet piles, thus affecting the construction efficiency and construction quality. The rigid strength of the double-layer guide frame can ensure the stability of the steel sheet pile positioning, and at the same time, the double-layer open guide frame is used to perform double positioning and adjustment on the steel sheet piles before pile sinking, so that the steel sheet piles can maintain accurate verticality during pile sinking construction, so that the steel sheet piles can not only adapt to stable vertical pile sinking in complex environments, but also maintain the verticality of the pile sinking process and the deviation of the pile top plane position accurately, which can effectively improve the efficiency of steel sheet pile sinking construction and the quality of the project.

[0044] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0045] The embodiment of the present invention discloses a steel sheet pile construction method based on double-layer guide frame auxiliary positioning.

[0046] According to the attached Figure 1 As shown, the following steps are included:

[0047] Step 1, construction preparation: according to the control points of the piles assigned by the design unit, establish the site control network, and measure and mark the axis and location of the steel sheet piles according to the drawing data. The specific process includes:

[0048] S101. Conduct an environmental survey of the construction site before construction to understand the geological conditions, hydrological conditions and surrounding environment of the construction site, and select suitable equipment for steel sheet pile settlement construction based on the survey results. The construction equipment includes but is not limited to 180t crawler crane, 55t crawler crane and hydraulic vibratory hammer. By fully understanding the address conditions, hydrological conditions and surrounding environment of the construction site, a scientific basis and decision-making support can be provided for the subsequent steel sheet pile settlement construction, ensuring the smooth progress of the construction process and the construction quality and safety;

[0049] S102, pre-grouping a plurality of steel sheet piles in pairs, and using a double-clamp fixture to splice and fix two steel sheet piles in the same group, so that the steel sheet piles are driven in a whole-group construction manner; grouping the steel sheet piles in pairs can connect the two steel sheet piles into a whole, enhance their ability to resist deformation, play a better role in resisting external loads and soil pressure, and maintain the stability of the steel sheet piles during the settlement construction process. The steel sheet piles in the whole group are more evenly stressed and have a longer service life. At the same time, using a double-clamp fixture to fix two steel sheet piles as a group can facilitate assembly, improve the accuracy of the position and angle of the steel sheet piles during the driving process, reduce assembly errors, thereby simplifying the construction process and improving construction efficiency;

[0050] S103, clean up the construction site so that the topsoil bearing capacity of the construction site meets the construction requirements. Through a combination of manual cleaning and cleaning with excavators, rollers and other equipment, the ground of the construction site is cleaned, pits are filled and compacted to ensure that the construction site meets the construction requirements. According to the control points of the piles handed over by the design unit, site control points are introduced, and site precipitation and drainage measures are taken. According to the site control points of the construction site, a site control network is established, and the steel sheet pile driving axis is measured and released according to the drawing data, and the steel sheet pile driving position is marked with white lime. The site control points provide accurate reference points for the steel sheet pile settlement construction, ensuring that various measurement and positioning work can be carried out accurately during the construction process. The site control network is a measurement network composed of multiple site control points on the construction site. Adjacent points can see each other and form a certain image. It can cover the entire construction area and provide comprehensive measurement and control for the steel sheet pile settlement construction. Construction personnel can quickly and accurately carry out measurement and positioning work, thereby improving construction efficiency and quality.

[0051] S104, in order to control the axis position of the sheet pile wall, ensure the verticality of the pile body and improve the penetration capacity of the steel sheet pile, and prevent the pile body from twisting and deforming during the driving of the steel sheet pile, a guide frame with sufficient rigidity and strength is set, commonly known as the "construction purlin";

[0052] Step 2, installation and adjustment of the guide frame: select a double-layer guide frame, which adopts a double-layer open guide beam double-sided form. The upper and lower guide beams must be rigidly connected to minimize the horizontal and vertical movement. The guide frame is connected to four anchor piles to ensure the stability of the guide frame during construction; adjustable guide wheels are set on the upper and lower horizontal and vertical beams of the guide frame to control and adjust the offset, inclination and verticality of the steel sheet piles. Among them, the length of the guide frame is planned to be L×W×H=12m×4m×4m according to the difficulty of on-site relocation, the number of sheet piles to be clamped, the number of newly driven sheet piles and the construction efficiency. The guide frame is planned to be made of H400 steel; install and adjust the double-layer guide frame according to the construction drawings, so that the verticality and stability of the double-layer guide frame installation meet the design requirements, and the size of the double-layer guide frame matches the steel sheet piles. The specific process includes:

[0053] S201, the guide frame is hoisted horizontally with four lifting points. Each lifting point uses a φ17.5mm×12m jointless wire rope loop. It is lifted by a 180t crawler crane. The guide frame platform is moved to the specified position by adjusting the boom, and the central axis of the bottom of the guide frame platform is ensured to coincide with the central axis of the steel sheet pile. The guide frame platform is lowered to the construction site.

[0054] S202, use a 180t crawler crane to lift a vibrating hammer, clamp the fixture on the pile clamping wing plate on the top of the positioning pile, vertically lift the vibrating hammer and the positioning pile, where the positioning pile is intended to be a Larsen steel sheet pile with a length of 12m, perform the positioning pile sinking operation at the corresponding pile position, and pull out the positioning pile after the pile sinking operation for turnover use;

[0055] S203, after the positioning piles are sunk, use a plumb bob to lower the center line of the two ends of the upper steel sheet pile guide groove of the guide frame platform, measure the distance between the plumb bob and the upper and lower guide groove edges, adjust the verticality and horizontality of the guide frame by lifting the auxiliary and the pad iron block on one side, and use a level to measure the bottom elevation of the guide pile groove to check, to ensure that the guide frame platform remains horizontal and the steel sheet pile can be vertically inserted into the groove. After the adjustment is completed, the guide frame is welded and fixed with the four positioning piles. Since the deviation of the horizontal line of the guide frame determines the deviation of the overall three-dimensional structure of the guide frame, the three-dimensional marking line can clearly mark the sinking position and angle of the steel sheet pile, which serves as a visual reference for the construction personnel to guide them to perform the pile sinking operation according to the predetermined trajectory, so that the steel sheet pile sinking work can be completed more quickly and accurately. Therefore, it is necessary to regularly check the three-dimensional marking line prepared in advance on the guide frame, and when checking the horizontal line, control the deviation value of ±10mm within the allowable error range; the preparation of the three-dimensional marking line in this embodiment is specifically as follows: according to the construction drawings and the actual situation on site According to the situation, determine the position and angle of the three-dimensional marking line on the guide frame, which usually involves the precise calculation of parameters such as the sinking position of the steel sheet pile, the sinking depth, and the spacing between adjacent steel sheet piles; after determining the position of the marking line, the construction personnel can draw a detailed marking line sketch, which should clearly indicate the shape, size, and position of the three-dimensional marking line for subsequent production and installation; according to the sketch, make a marking line template that matches the guide frame. This template can be made of steel plates, wooden boards or other hard materials to ensure that it has a certain strength and rigidity. The shape and position of the three-dimensional marking line should be engraved on the template according to the requirements of the sketch; fix the prepared marking line template on the guide frame, and use appropriate pigments or paints to draw the three-dimensional marking line along the edge of the template. During the drawing process, it is necessary to ensure the clarity and accuracy of the marking line so that the construction personnel can clearly see and follow these marking lines to perform pile sinking operations;

[0056] By using a double-layer guide frame to assist in the positioning of steel sheet piles for settlement construction, the double-layer open guide frame can be used for dual positioning through the upper and lower limit plates, which can effectively improve the stability of the steel sheet piles before sinking and ensure that the plane position of the steel sheet pile foundation meets the design requirements. This design not only improves the construction efficiency, but also reduces the rework and repair work caused by inaccurate positioning; at the same time, in the permanent project of sheet pile wall wharf, the verticality of the steel sheet pile is one of the key factors to ensure the safety of the structure. If the verticality cannot be effectively controlled, the later adjustment will be very difficult and in serious cases, it will cause the overall steel sheet pile to collapse. Uneven force affects the overall stability. The use of double-layer open guide frames can effectively solve this problem and ensure the safety and stability of the structure. In some complex environments, such as deep-water construction or projects that require inclined support, traditional pile driving processes are difficult to maintain the verticality of steel sheet piles. The design of double-layer open guide frames can better adapt to these complex environments. By improving the firmness and stability of the guide frames, the verticality of steel sheet piles can be ensured, so that steel sheet pile settlement construction can adapt to complex environments. In addition, during the pile driving process, verticality and pile top plane position deviation are important factors affecting project quality. The double-layer guide frame can effectively control these deviations through precise positioning and stable support, thereby improving the overall project quality.

[0057] Step 3: Steel sheet pile driving: insert the steel sheet pile into the guide frame for positioning, use pile driving equipment to drive the steel sheet pile, and pay attention to the verticality and plane position deviation of the steel sheet pile during the pile driving process to ensure that it meets the design requirements. When the deviation of the verticality of the steel sheet pile and the plane position of the pile top exceeds the allowable range, make timely adjustments; the specific process includes:

[0058] S301, hang two φ24mm×9m steel wire ropes on the main hook of the 55t crawler crane, connect the other end to the two lifting holes on the top of the steel sheet pile through the shackle, slowly lift the hook to turn the steel sheet pile over and erect the column, when the lifting distance is about 4m from the ground, adjust the boom of the crawler crane to move the steel sheet pile to the top of the guide frame, then slowly lower the hook to make the steel sheet pile enter the guide frame for preliminary adjustment of the steel sheet pile posture and self-sinking, pay attention to the crane driver and the crane commander to maintain smooth communication during the lifting operation, and the command signal is clear;

[0059] S302, use a 180t crawler crane to lift the vibrating hammer to clamp the pile. Under the control of the horizontal and vertical total station, adjust the crawler crane rod, hook head, hammer body and pile center to the same straight line left and right, front and back. Then, under the force of the hook, the vibrating hammer slowly drops the hook and vibrates and sinks. Fine-tune the position and verticality of the steel sheet pile for positioning. Then, install limit stops on both sides of the upper and lower pile bodies of the guide frame. In each pile position, the coordinates of the pile core where the steel sheet pile is expected to be inserted are released. The position where the guide wheel should be adjusted is calculated and measured. The preset pile core is tested and the verticality of the steel sheet pile is further finely adjusted by adjusting the guide wheel on the guide frame platform.

[0060] S303, hoist the vibrating hammer, use the clamp to clamp the top of the steel sheet pile, and after clamping, start the vibrating hammer. Under the force of the hook, the vibrating hammer slowly drops the hook and vibrates. During the initial driving of the steel sheet pile, monitor the verticality change of the pile body. Use two total stations at 90 degrees to control the position and verticality of the steel sheet pile using the intersection method. During the pile sinking process, use the monitoring system to monitor the verticality and deviation of the steel sheet pile during the vibration and insertion process, and make timely adjustments when the steel sheet pile is deviated;

[0061] S304, after the first pile is vibrated and sunk to 4m above the guide frame platform and the 55t crawler crane is turned over and the pile is erected, the 180t crawler crane uses double chucks to clamp the pile, and cooperates with the cable wind rope or hand winch to adjust the spacing between the auxiliary pile tip locks, and aligns the pile tip locks with the pile top locks of the adjacent auxiliary piles to make grooves. After the grooves are made, adjust the hook, confirm that the verticality of the hammer body and the pile body is correct, start the vibrating hammer, and slowly drop the hook while maintaining a certain lifting force, so that the steel sheet pile vibrates and sinks to 4m above the guide frame platform. Repeat the above operation to vibrate and sink 6-7 piles, release the guide frame limit and proceed to the next machine position construction until all the steel sheet piles are fully sunk and positioned.

[0062] Among them, in 101, the geological conditions, hydrological conditions and surrounding environment of the construction site are specifically understood as follows:

[0063] Find out the formation age, structural characteristics of the strata, physical and mechanical properties and spatial distribution characteristics of the foundation soil layer, evaluate the bearing capacity and stability of the foundation soil layer, and provide a basis for selecting the appropriate pile type and pile length;

[0064] Analyze the groundwater level, find out the type, depth and burial conditions of groundwater in the site, provide the basic law of groundwater level dynamic change, and the recommended values ​​of steel sheet pile anti-floating design water level and anti-seepage design water level, and then evaluate the impact of groundwater on the construction process, and provide data support for site precipitation or drainage measures;

[0065] Check the distribution and condition of buildings, roads, underground pipelines and other facilities around the construction site, assess the possible impact of construction activities on the surrounding environment, such as noise, vibration, settlement, etc., and formulate corresponding mitigation measures, which may include installing soundproof fences, adjusting construction time periods, etc.

[0066] In S104, the guide frame used is a double-layer open guide beam double-sided form, the upper and lower guide beams on the guide frame are rigidly connected, the guide frame is connected to four anchor piles, and adjustable guide wheels are installed on the upper and lower transverse and longitudinal beams of the guide frame to control and adjust the deviation, inclination and verticality of the steel sheet piles.

[0067] Among them, in S202, the sinking of the positioning piles is specifically as follows:

[0068] The position marked with white lime in S103 is the location for the positioning piles;

[0069] Install the clamp on the clamping part of the vibrating hammer, make sure the clamp is firmly connected to the vibrating hammer, then open the clamp arm to clamp the clamping wing plate on the top of the positioning pile;

[0070] Start the 180t crawler crane to lift the vibrating hammer and the positioning pile together, adjust the boom angle and position of the crawler crane, so that the vibrating hammer and the positioning pile accurately correspond to the marked position of the pile and the verticality and inclination of the positioning pile;

[0071] Start the vibration device of the vibratory hammer, and gradually sink the positioning pile into the soil layer through the impact force generated by the vibration. During the pile sinking process, it is necessary to pay attention to the vibration frequency and amplitude of the vibratory hammer as well as the sinking speed and amount of the positioning pile. If the positioning pile is deflected or the sinking speed is abnormal, timely adjustments should be made to ensure that the positioning pile sinks vertically into the soil layer to a sufficient depth.

[0072] It should be noted that in S303, when the steel sheet pile is misaligned during the vibration and insertion process and the crawler crane cannot adjust the pile position deviation, if the length of the steel sheet pile above the ground is greater than or equal to half of the length of the steel sheet pile, the steel sheet pile is pulled up by the crawler crane, and the steel sheet pile is vibrated and inserted again according to the S303 step; if the length of the steel sheet pile above the ground is less than half of the length of the steel sheet pile, the deviation of the steel sheet pile is corrected by adjusting the vibration frequency and strength of the vibrating hammer.

[0073] Furthermore, in S304, the initial driving of steel sheet piles at the subsequent machine positions adopts the "root-by-root construction method", and the specific operation is: using the previous steel sheet pile as a construction guide, the locking and groove of the steel sheet piles are carried out in sequence, and after completion, the vibrating hammer is lifted to clamp the piles for vibration sinking, and after completing the initial driving of 6 groups of steel sheet piles in sequence, the guide frame limit is released and the next machine position is moved to construction.

[0074] Furthermore, after the steel sheet pile driving step is completed, the disassembly steps of the guide frame platform are specifically as follows: hang a lifting sling on the guide frame platform, cut off the connection between the guide frame platform and the positioning pile on one side, slowly lift the guide frame, ensure that it has no interference with the vibrated steel sheet pile, move it along the direction of the sunken pile and use the axis of the sunken pile to position the guide frame. When the guide frame is pulled out of or inserted into the main pile that has been vibrated, keep the guide frame as a whole stable, slowly lift or fall, and strictly prevent the guide groove from colliding with the pile body of the driven main pile and causing deformation.

[0075] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A steel sheet pile construction method based on double-layer guide frame auxiliary positioning, characterized in that: The following steps are involved: Step 1, construction preparation: according to the control points of the piles handed over by the design unit, establish the site control network, and measure and mark the axis and location of the steel sheet piles according to the drawing data; Step 2: Installation and adjustment of the guide frame: Select a double-layer guide frame, install and adjust the double-layer guide frame according to the construction drawings, make the verticality and stability of the double-layer guide frame meet the design requirements, and make the size of the double-layer guide frame match that of the steel sheet pile; Step three, driving the steel sheet piles: insert the steel sheet piles into the guide frame for positioning, use pile driving equipment to drive the steel sheet piles, and pay attention to the verticality and plane position deviation of the steel sheet piles during the pile driving operation, and make timely adjustments when the deviation of the verticality and plane position of the steel sheet piles exceeds the allowable range.

2. According to claim 1, a steel sheet pile construction method based on double-layer guide frame auxiliary positioning is characterized in that: In the step 1, the construction preparation specifically includes the following steps: S101. Conduct an environmental survey of the construction site before construction to understand the geological conditions, hydrological conditions and surrounding environment of the construction site, and select suitable equipment for steel sheet pile settlement construction based on the survey results. The construction equipment includes but is not limited to 180t crawler crane, 55t crawler crane and hydraulic vibratory hammer; S102, pre-grouping the plurality of steel sheet piles in pairs, and using a double-clamp fixture to splice and fix two steel sheet piles in the same group, so that the steel sheet piles are driven in a whole-group construction manner; S103, clean up the construction site so that the surface soil bearing capacity of the construction site meets the construction requirements, introduce site control points according to the control points of the piles assigned by the design unit, and take measures for site precipitation and drainage. Establish a site control network according to the site control points of the construction site, and measure and lay out the steel sheet pile driving axis according to the drawing data, and mark the steel sheet pile driving position with white lime; S104, in order to control the axis position of the sheet pile wall, ensure the verticality of the pile body and improve the penetration capacity of the steel sheet pile, and prevent the twisting deformation of the pile body during the injection of the steel sheet pile, a guide frame with sufficient rigidity and strength is set.

3. A steel sheet pile construction method based on double-layer guide frame auxiliary positioning according to claim 2, characterized in that: In the above 101, understanding the geological conditions, hydrological conditions and surrounding environment of the construction site specifically includes: Find out the formation age, structural characteristics of the strata, physical and mechanical properties and spatial distribution characteristics of the foundation soil layer, evaluate the bearing capacity and stability of the foundation soil layer, and provide a basis for selecting the appropriate pile type and pile length; Analyze the groundwater level, find out the type, depth and burial conditions of groundwater in the site, provide the basic law of groundwater level dynamic change, and the recommended values ​​of steel sheet pile anti-floating design water level and anti-seepage design water level, and then evaluate the impact of groundwater on the construction process, and provide data support for site precipitation or drainage measures; Verify the distribution and condition of buildings, roads, underground pipelines and other facilities around the construction site, assess the possible impact of construction activities on the surrounding environment, such as noise, vibration, settlement, etc., and formulate corresponding mitigation measures.

4. A steel sheet pile construction method based on double-layer guide frame auxiliary positioning according to claim 3, characterized in that: In the S104, the guide frame used is a double-layer open guide beam double-sided form, the upper and lower guide beams on the guide frame are rigidly connected, the guide frame is connected to four anchor piles, and adjustable guide wheels are installed on the upper and lower transverse and longitudinal beams of the guide frame to control and adjust the deviation, inclination and verticality of the steel sheet piles.

5. A steel sheet pile construction method based on double-layer guide frame auxiliary positioning according to claim 4, characterized in that: In the step 2, the installation and adjustment of the guide frame specifically includes the following steps: S201, the guide frame is hoisted horizontally with four lifting points, each lifting point adopts a jointless wire rope loop, and is hoisted with a 180t crawler crane. The guide frame platform is moved to the specified position by adjusting the boom, and the central axis of the bottom of the guide frame platform is ensured to coincide with the central axis of the steel sheet pile, and the guide frame platform is lowered to the construction site; S202, use a 180t crawler crane to lift the vibratory hammer, clamp the fixture on the pile clamping wing plate on the top of the positioning pile, vertically lift the vibratory hammer and the positioning pile, perform the positioning pile sinking operation at the corresponding pile position, and pull out the positioning pile for turnover use after the pile sinking operation; S203, after the positioning piles are sunk, use a plumb bob to lower the center line of both ends of the upper steel sheet pile guide groove on the guide frame platform, measure the distance between the plumb bob and the upper and lower guide groove edges, adjust the verticality and horizontality of the guide frame by lifting the auxiliary iron block on one side, and use a level to measure the elevation of the bottom of the guide pile groove to verify, to ensure that the guide frame platform remains horizontal and the steel sheet piles can be vertically inserted into the groove. After the adjustment is completed, weld the guide frame with the four positioning piles, regularly check the three-dimensional marking lines pre-made on the guide frame, and when verifying the horizontal line, control the deviation value of ±10mm within the allowable error range.

6. A steel sheet pile construction method based on double-layer guide frame auxiliary positioning according to claim 5, characterized in that: In S202, the sinking of the positioning piles is specifically as follows: The position marked with white lime in S103 is the location for the positioning piles; Install the clamp on the clamping part of the vibrating hammer, make sure the clamp is firmly connected to the vibrating hammer, then open the clamp arm to clamp the clamping wing plate on the top of the positioning pile; Start the 180t crawler crane to lift the vibrating hammer and the positioning pile together, adjust the boom angle and position of the crawler crane, so that the vibrating hammer and the positioning pile accurately correspond to the marked position of the pile and the verticality and inclination of the positioning pile; Start the vibration device of the vibratory hammer, and gradually sink the positioning pile into the soil layer through the impact force generated by the vibration. During the pile sinking process, it is necessary to pay attention to the vibration frequency and amplitude of the vibratory hammer as well as the sinking speed and amount of the positioning pile. If the positioning pile is deflected or the sinking speed is abnormal, timely adjustments should be made to ensure that the positioning pile sinks vertically into the soil layer to a sufficient depth.

7. A steel sheet pile construction method based on double-layer guide frame auxiliary positioning according to claim 6, characterized in that: In step 3, the steel sheet pile driving specifically includes the following steps: S301, two steel wire ropes are hung on the main hook of the 55t crawler crane, and the other end is connected to the two lifting holes on the top of the steel sheet pile through a shackle. The hook is slowly raised to turn the steel sheet pile over and set up the column, and then the hook is slowly lowered to make the steel sheet pile enter the guide frame for preliminary adjustment of the steel sheet pile posture and self-sinking; S302, use a 180t crawler crane to lift the vibrating hammer to clamp the pile. Under the control of the horizontal and vertical total station, adjust the crawler crane rod, hook head, hammer body and pile center to the same straight line left and right, front and back. Then, under the force of the hook, the vibrating hammer slowly drops the hook and vibrates and sinks. Fine-tune the position and verticality of the steel sheet pile for positioning. Then, install limit stops on both sides of the upper and lower pile bodies of the guide frame. In each pile position, the coordinates of the pile core where the steel sheet pile is expected to be inserted are released. The position where the guide wheel should be adjusted is calculated and measured. The preset pile core is tested and the verticality of the steel sheet pile is further finely adjusted by adjusting the guide wheel on the guide frame platform. S303, hoist the vibrating hammer, use the clamp to clamp the top of the steel sheet pile, and after clamping, start the vibrating hammer. Under the force of the hook, the vibrating hammer slowly drops the hook and vibrates. During the initial driving of the steel sheet pile, monitor the verticality change of the pile body. Use two total stations at 90 degrees to control the position and verticality of the steel sheet pile using the intersection method. During the pile sinking process, use the monitoring system to monitor the verticality and deviation of the steel sheet pile during the vibration and insertion process, and make timely adjustments when the steel sheet pile is deviated; S304, after the first pile is vibrated and sunk to 4m above the guide frame platform and the 55t crawler crane is turned over and the pile is erected, the 180t crawler crane uses double chucks to clamp the pile, and cooperates with the cable wind rope or hand winch to adjust the spacing between the auxiliary pile tip locks, and aligns the pile tip locks with the pile top locks of the adjacent auxiliary piles to make grooves. After the grooves are made, adjust the hook, confirm that the verticality of the hammer body and the pile body is correct, start the vibrating hammer, and slowly drop the hook while maintaining a certain lifting force, so that the steel sheet pile vibrates and sinks to 4m above the guide frame platform. Repeat the above operation to vibrate and sink 6-7 piles, release the guide frame limit and proceed to the next machine position construction until all the steel sheet piles are fully sunk and positioned.

8. A steel sheet pile construction method based on double-layer guide frame auxiliary positioning according to claim 7, characterized in that: In S304, the initial driving of the steel sheet piles at the subsequent machine positions adopts the "root-by-root construction method", and the specific operations are as follows: Using the above steel sheet pile as the construction guide, the locking and groove of the steel sheet pile are carried out in sequence. After completion, the vibrating hammer is lifted to clamp the pile and vibrate and sink it. After completing the initial driving of 6 groups of steel sheet piles in sequence, the guide frame limit is released and the machine is moved to the next position for construction.

9. A steel sheet pile construction method based on double-layer guide frame auxiliary positioning according to claim 8, characterized in that: After the steel sheet pile driving step is completed, the steps for disassembling the guide frame platform are as follows: Hang the lifting sling on the guide frame platform, cut off the connection between the guide frame platform and the positioning pile on one side, lift the guide frame slowly, ensure that there is no interference with the vibrated steel sheet pile, move it along the direction of the sunk pile and use the axis of the sunk pile to position the guide frame. When the guide frame is pulled out of or inserted into the vibrated main pile, keep the guide frame stable as a whole, lift or drop it slowly, and prevent the guide groove from colliding strongly with the body of the driven main pile and causing deformation.

10. A steel sheet pile construction method based on double-layer guide frame auxiliary positioning according to claim 9, characterized in that: In the S303, when the steel sheet pile is misaligned during the vibration and insertion process and the crawler crane cannot adjust the pile position deviation, if the length of the steel sheet pile above the ground is greater than or equal to half of the length of the steel sheet pile, the steel sheet pile is pulled up by the crawler crane, and the steel sheet pile is vibrated and inserted again according to the S303 step; if the length of the steel sheet pile above the ground is less than half of the length of the steel sheet pile, the deviation of the steel sheet pile is corrected by adjusting the vibration frequency and strength of the vibrating hammer.

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