CN114775664A - Steel sheet pile cofferdam construction method for deep foundation pit and steel sheet pile cofferdam - Google Patents
Steel sheet pile cofferdam construction method for deep foundation pit and steel sheet pile cofferdam Download PDFInfo
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- CN114775664A CN114775664A CN202210574920.9A CN202210574920A CN114775664A CN 114775664 A CN114775664 A CN 114775664A CN 202210574920 A CN202210574920 A CN 202210574920A CN 114775664 A CN114775664 A CN 114775664A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D13/00—Accessories for placing or removing piles or bulkheads, e.g. noise attenuating chambers
- E02D13/04—Guide devices; Guide frames
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/16—Arrangement or construction of joints in foundation structures
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/02—Sheet piles or sheet pile bulkheads
- E02D5/03—Prefabricated parts, e.g. composite sheet piles
- E02D5/04—Prefabricated parts, e.g. composite sheet piles made of steel
- E02D5/08—Locking forms; Edge joints; Pile crossings; Branch pieces
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D7/00—Methods or apparatus for placing sheet pile bulkheads, piles, mouldpipes, or other moulds
Abstract
The application relates to a steel sheet pile cofferdam construction method for a deep foundation pit and a steel sheet pile cofferdam, and relates to the technical field of cofferdam construction. The steel sheet pile cofferdam construction method includes the steps of firstly obtaining geological information of a construction site, determining a construction area, arranging a guide structure in the construction area, then sequentially inserting and driving steel sheet piles under the guide of the guide structure, selecting a water knife or an air knife to guide holes alternately in the inserting and driving process according to the obtained geological information to assist the steel sheet piles to be inserted and driven to a preset depth, excavating a foundation pit after closure of the steel sheet piles is completed, arranging a plurality of inner support structures from top to bottom in the excavating process, and finally injecting bottom sealing concrete towards the bottom of the foundation pit along the outer side wall of the steel sheet piles to complete bottom sealing of the foundation pit. According to the steel sheet pile cofferdam construction method, under the combined assistance of the water jet cutter and the air knife, the steel sheet pile can be inserted and driven to a deeper depth, the waterproof effect is good, and the difficulty of construction and hoisting is reduced.
Description
Technical Field
The application relates to the technical field of cofferdam construction, in particular to a steel sheet pile cofferdam construction method for a deep foundation pit and a steel sheet pile cofferdam.
Background
The cofferdam is a temporary water retaining structure built around a foundation pit for building permanent facilities in the construction of bridges, ports and water conservancy projects, and mainly has the function of preventing water and soil from entering a building construction position so as to facilitate the construction of drainage and dumping in the cofferdam and ensure that the excavation of the foundation pit and the building construction are carried out under dry conditions.
The cofferdams comprise an earth rock cofferdam, a wooden cofferdam, a steel sheet pile cofferdam, a steel pipe pile cofferdam and a combined cofferdam of the steel sheet pile and the steel pipe pile. The general steel sheet pile has the advantages of high strength, light weight, good water resistance, long service life, high safety, low requirement on space, obvious environment protection effect and the like, and in addition, the construction process is simpler than that of a steel pipe pile and a combined cofferdam, the construction is simple, the construction period is short, the repeated use is realized, the construction cost is low, and the application of the steel sheet pile is quite wide. However, the steel sheet piles are limited by the inserting and driving depth, at present, the deepest inserting and driving depth of the steel sheet piles does not exceed 10 meters, otherwise, the problem of deformation can occur, and the isolation effect of the cofferdam is further influenced.
Therefore, in the related art, the cofferdam with a large scale and a deep depth is usually a steel pipe pile cofferdam, the inserting and driving depth of the cofferdam is larger than that of a steel plate pile, the cofferdam is not easy to deform, and the cofferdam can be suitable for a hard soil layer. However, the steel pipe pile cofferdam is difficult to construct integrally, the soil squeezing effect in the inserting and beating process is large, the integral construction period is long, and the construction cost is high.
Disclosure of Invention
The embodiment of the application provides a steel sheet pile cofferdam construction method for a deep foundation pit and a steel sheet pile cofferdam, and aims to solve the problems that in the related art, a steel sheet pile cannot adapt to cofferdam construction of the deep foundation pit, and deformation is easy to occur in the inserting and driving process, so that the cofferdam performance is affected.
In a first aspect, a steel sheet pile cofferdam construction method for a deep foundation pit is provided, which comprises the following steps:
acquiring geological information of a construction site, and determining a construction area;
arranging a guide structure in the construction area;
sequentially inserting and driving steel sheet piles under the guidance of the guide structure, and selecting water knives or air knives to alternately guide holes according to the obtained geological information in the inserting and driving process so as to assist the steel sheet piles to be inserted and driven to a preset depth;
completing closure of the steel sheet piles, excavating the foundation pit, and arranging a plurality of inner supporting structures from top to bottom in the excavation process;
and injecting bottom sealing concrete towards the bottom of the foundation pit along the outer side wall of the steel sheet pile to complete bottom sealing of the foundation pit.
In some embodiments, the step of arranging a guide structure at a preset position of the construction area comprises:
sequentially determining inserting and hitting points of the steel sheet piles in the construction area;
sequentially inserting and driving a plurality of steel pipe piles on the inner side and the outer side of the determined circle of inserting and driving points along the arrangement track of the inserting and driving points respectively, and arranging guide H-shaped steel on the tops of the steel pipe piles on the inner side and the outer side after inserting and driving are finished;
be located inboard and the outside the direction I-steel is slided and is established the spacing reinforcing bar that a plurality of intervals set up.
In some embodiments, the sequentially inserting and driving the steel sheet piles under the guidance of the guide structure further includes:
adjusting one limiting reinforcing bar to one side of the corresponding inserting and striking point;
and inserting and driving the steel sheet piles, respectively using the guide I-beams positioned on the inner side and the outer side to jointly assist in correcting the positions of the steel sheet piles in the direction from the inner side to the outer side in the inserting and driving process, and using the limiting reinforcing bars to assist in correcting the positions of the steel sheet piles in the left and right directions.
In some embodiments, the selecting a water knife or an air knife to alternatively guide the hole according to the obtained geological information in the inserting and striking process to assist the inserting and striking of the steel sheet pile to a preset depth includes:
determining the geological information of the current inserting and punching depth, if the geological information of the current inserting and punching depth is hard plastic clay or gravel soil, guiding the hole by adopting a water jet cutter, and if the geological information of the current inserting and punching depth is argillaceous siltstone or strongly weathered rock, guiding the hole by adopting an air knife;
and selecting a water knife or an air knife to alternatively guide holes in the inserting and driving process according to the geological information until the steel sheet pile is inserted and driven to the preset depth.
In some embodiments, before inserting and driving the steel sheet pile, the method further comprises:
arranging a vertically-arranged hole guiding pipe on the inner wall of a web plate of the steel sheet pile along the length direction of the steel sheet pile, and arranging at least two hole guiding nozzles arranged downwards at the bottom end of the hole guiding pipe;
and a vertically arranged grouting pipe is arranged on the outer wall of the web plate of the steel sheet pile along the length direction of the steel sheet pile.
In some embodiments, before inserting and driving the steel sheet pile, the method further comprises:
coating a waterproof agent on the lock of the steel sheet pile;
the waterproof agent comprises Portland cement, quartz sand, anti-seepage fly ash, organosilicon hydrophobic powder, HPMC cellulose, polyurethane single-component double-component I type, polyurethane single-component double-component II type, cement-based infiltration crystallization and polymer cement waterproof coating JS, wherein the mass ratio of each component is 52: 38: 5: 75: 3: 10: 5: 5: 10, the quartz sand comprises 100-mesh quartz sand and 200-mesh quartz sand, and the mass ratio of the 100-mesh quartz sand to the 200-mesh quartz sand is 15: 4.
in some embodiments, the step of providing a plurality of inner support structures from top to bottom during excavation comprises:
arranging a steel purlin along the inner wall of the steel sheet pile cofferdam;
an inner support structure is arranged on the steel purlin;
and continuously excavating downwards, and sequentially arranging the steel enclosing purlins and the inner supporting structures, wherein the larger the excavating depth is, the smaller the distance between every two adjacent steel enclosing purlins or the inner supporting structures is.
In a second aspect, a steel sheet pile cofferdam for a deep foundation pit is provided, which includes:
the cofferdam comprises a cofferdam main body and a plurality of steel sheet piles connected end to end, wherein each steel sheet pile is provided with a hole guiding component and a liquid injection component, the hole guiding component is used for selecting a water knife or an air knife to guide holes alternately according to geological information of a construction site so as to assist the steel sheet piles to be inserted and driven to a preset depth, and the liquid injection component is used for injecting bottom sealing concrete towards the bottom of a foundation pit along the outer side wall of the steel sheet pile so as to complete bottom sealing of the foundation pit;
and the guide structure is arranged along the circumferential direction of the cofferdam main body and is used for guiding the steel sheet piles during inserting and driving.
In some embodiments, the guide structure includes a plurality of steel pipe piles, a part of the steel pipe piles are arranged at intervals along the arrangement track of the steel plate piles at the inner sides of the steel pipe piles, the remaining part of the steel pipe piles are arranged at intervals along the arrangement track of the steel plate piles at the outer sides of the steel pipe piles, a plurality of guide i-shaped steels are arranged at the tops of the steel pipe piles at the inner sides and the outer sides, and a plurality of spacing reinforcing bars are arranged on the guide i-shaped steels at the inner sides and the outer sides in a sliding manner;
the guide I-shaped steel is used for limiting the deviation of the steel sheet piles along the direction towards the inner side or the outer side during inserting and driving, and the limiting reinforcing bars are used for limiting the deviation of the steel sheet piles along the left side and the right side during inserting and driving.
In some embodiments, the lock of each steel sheet pile is coated with a waterproof agent, the waterproof agent includes portland cement, quartz sand, impervious material fly ash, organosilicon hydrophobic powder, HPMC cellulose, polyurethane single-component two-component type I, polyurethane single-component two-component type II, cement-based capillary crystallization, and polymer cement waterproof paint JS, and the mass ratio of the components is 52: 38: 5: 75: 3: 10: 5: 5: 10, the quartz sand comprises 100-mesh quartz sand and 200-mesh quartz sand, and the mass ratio of the 100-mesh quartz sand to the 200-mesh quartz sand is 15: 4.
the technical scheme who provides this application brings beneficial effect includes:
the embodiment of the application provides a steel sheet pile cofferdam construction method for a deep foundation pit, which is characterized in that a guide structure is arranged in a construction area, then steel sheet piles are sequentially inserted and beaten under the guide of the guide structure according to acquired geological information of a construction site, a water knife or an air knife is selected to alternately lead holes according to the acquired geological information in the inserting and beating process so as to assist the insertion and beating of the steel sheet piles to a preset depth, a plurality of inner support structures are arranged from top to bottom in the excavation process of the foundation pit, and finally, bottom sealing concrete is injected towards the bottom of the foundation pit along the outer side wall of the steel sheet pile to complete the bottom sealing of the foundation pit, so that the steel sheet pile can be inserted and beaten to a deeper depth under the combined assistance of the water knife and the air knife, and cannot deform in the inserting and beating process so as to ensure the foundation performance of the cofferdam; in addition, the soil taking amount and the use of concrete are greatly reduced in the whole construction process, the waterproof effect is good, and the difficulty of construction and hoisting is reduced due to the relatively light weight of the steel sheet pile; and finally, the steel sheet piles are used as the female piles for hole guiding and grouting, so that the problems that soil layers are loose and the inserting and driving of the steel sheet piles and the performance of the cofferdam foundation are influenced in the process of pulling out the female piles at the later stage by independently inserting and driving the steel sheet piles are solved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a steel sheet pile cofferdam construction method for a deep foundation pit according to an embodiment of the present application;
fig. 2 is a top view of a steel sheet pile cofferdam for a deep foundation pit provided in the embodiment of the present application.
In the figure: 1-cofferdam main body, 2-steel sheet pile, 3-guide structure, 30-guide I-shaped steel and 31-limit reinforcing bar.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.
The embodiment of the application provides a steel sheet pile cofferdam construction method for a deep foundation pit, which can solve the problems that in the related art, a steel sheet pile cannot adapt to the cofferdam construction of the deep foundation pit, and the cofferdam performance is influenced because the steel sheet pile is easy to deform in the inserting and beating process.
Referring to fig. 1, the steel sheet pile cofferdam construction method includes the steps of: firstly, acquiring geological information of a construction site, determining a construction area, then arranging a guide structure 3 in the construction area, sequentially inserting and driving steel sheet piles 2 under the guide of the guide structure 3, selecting a water knife or an air knife to guide holes alternately in the inserting and driving process according to the acquired geological information to assist the steel sheet piles 2 to be inserted and driven to a preset depth, then completing closure of the steel sheet piles 2, excavating a foundation pit, arranging a plurality of inner support structures from top to bottom in the excavating process, and finally injecting bottom sealing concrete towards the bottom of the foundation pit along the outer side walls of the steel sheet piles 2 to complete bottom sealing of the foundation pit.
According to the construction method of the steel sheet pile cofferdam, the steel sheet pile 2 can realize deeper inserting and driving according to the specific geological conditions of the construction site and under the combined assistance of the water jet and the air knife, so that the problem that the steel sheet pile 2 is likely to deform along with the deeper inserting and driving is solved, the steel sheet pile is not deformed in the inserting and driving process, and the basic performance of the cofferdam is ensured; in addition, compared with other cofferdam forms, the construction method of the steel sheet pile cofferdam greatly reduces the soil sampling amount and the use of concrete in the whole construction process, has a water-resisting effect more prominent than that of a steel pipe pile, reduces the difficulty of construction hoisting because the steel sheet pile 2 has lighter relative mass, and reduces the construction difficulty; and finally, the steel sheet pile 2 is used as a female pile for hole guiding and grouting, so that the problems that the soil layer is loose and the inserting and driving of the steel sheet pile 2 and the foundation performance of the cofferdam are influenced in the process of pulling out the female pile at the later stage by independently inserting and driving are solved.
Further, a guide structure 3 is arranged at a preset position of the construction area, and the steps mainly comprise:
sequentially determining the inserting and striking points of the steel sheet piles 2 in the construction area;
sequentially inserting and driving a plurality of steel pipe piles on the inner side and the outer side of the determined circle of inserting and driving point positions along the arrangement track of the inserting and driving points respectively, and arranging guide I-shaped steel 30 on the tops of the steel pipe piles on the inner side and the outer side after inserting and driving;
a plurality of spacing reinforcing bars 31 arranged at intervals are arranged on the guiding I-shaped steel 30 positioned at the inner side and the outer side in a sliding way.
Further, insert in proper order and beat steel sheet pile 2 under guide structure 3's direction, its step still includes:
adjusting one of the limiting reinforcing bars 31 to one side of the corresponding inserting and striking point;
inserting and driving the steel sheet piles 2, respectively using the guide I-shaped steel 30 positioned on the inner side and the outer side to jointly assist in correcting the positions of the steel sheet piles 2 in the direction from the inner side to the outer side in the inserting and driving process, and using the limiting reinforcing bars 31 to assist in correcting the positions of the steel sheet piles 2 in the left-right direction.
Specifically, each inserting and striking point position is determined in a construction area, each inserting and striking point position is marked and then is subjected to rechecking and effective protection, then a plurality of steel pipe piles are sequentially inserted and struck along the arrangement track of the inserting and striking points on the inner side and the outer side of a circle of determined inserting and striking point positions respectively, the inserted and struck steel pipe piles are utilized for primary positioning, the directions of the steel pipe piles on the inner side and the outer side correspond to the shape of a cofferdam, namely, the steel pipe piles on each side of the inner side and the outer side form a square structure, guide I-beams 30 are arranged on the steel pipe piles on each side of the inner side and the outer side, after the guide I-beams 30 are arranged, limiting reinforcing bars 31 capable of sliding along the length direction of the guide I-beams are erected on the guide I-beams 30 on the same side of the inner side and the outer side, when the steel plate piles 2 are inserted and struck, the side walls of the ideal side surfaces of the guide I-beams 30 on the inner side and the outer side are utilized to jointly assist in correcting the position of the steel plate piles from the inner side to the outer side, that is, as a reference, the steel sheet pile 2 is prevented from deviating in the outward or inward direction during the insertion driving process, and similarly, the limiting reinforcing bar 31 is used to assist in correcting the position of the steel sheet pile 2 in the left-right direction, and prevent the steel sheet pile 2 from deviating in the left-right direction during the insertion driving process. The guide I-shaped steel 30 and the limiting reinforcing bars 31 serve as guide position and elevation control marks during piling, and the steel sheet piles 2 which are driven to be on the same side can be guaranteed to be on the same straight line.
Further, in the inserting and punching process, according to the obtained geological information, a water knife or an air knife is selected to alternately lead holes so as to assist the inserting and punching of the steel sheet pile 2 to a preset depth, and the inserting and punching process comprises the following steps:
determining the geological information of the current inserting and punching depth, if the geological information of the current inserting and punching depth is hard plastic clay or gravel soil, guiding the hole by adopting a water jet cutter, and if the geological information of the current inserting and punching depth is argillaceous siltstone or strongly weathered rock, guiding the hole by adopting an air knife;
and in the inserting and punching process, water knives or air knives are selected to alternately guide holes according to geological information until the steel sheet pile 2 is inserted and punched to a preset depth.
Further, still include before inserting and beating steel sheet pile 2:
a hole guiding pipe which is vertically arranged is arranged on the inner wall of a web plate of the steel sheet pile 2 along the length direction of the web plate, and at least two hole guiding nozzles which are arranged downwards are arranged at the bottom end of the hole guiding pipe;
and a vertically arranged grouting pipe is arranged on the outer wall of the web plate of the steel sheet pile 2 along the length direction of the web plate.
Because some construction sites have complicated geology, air knives or water knives are selectively selected to guide holes according to specific geological information corresponding to different depths, specifically, if the inserting and striking are not in place due to the fact that the bottom layer is hard plastic clay and gravel soil environment, a high-pressure water jet assisting mode is adopted to be matched with the steel plate pile 2 for inserting and striking, and high-pressure water flow is sprayed to impact the soil layer in the cavity of the steel plate pile 2, so that the surrounding soil is liquefied after being disturbed, the resistance of the steel plate pile 2 when being driven into the soil layer is reduced, the possibility that the steel plate pile 2 is distorted and damaged in the inserting and striking process is reduced, the construction cost is reduced, the construction progress is accelerated, and the construction quality is ensured; if the bottom geological environment becomes argillaceous siltstone, highly weathered rock and other higher-strength soil, the water jet cutter is recycled, hole leading is difficult to conduct, the water jet cutter is changed into an air knife, a high-pressure air blast auxiliary mode is adopted to match with inserting and striking of the steel plate pile 2, high-pressure air can form an air area in an anhydrous state at the pile head of the steel plate pile 2, the high-pressure air directly damages the rock stratum after water isolation, the air floats upwards under the influence of water buoyancy, the geology of the steel plate pile is liquefied again in the whole hole leading process, the high-pressure air hole leading process is more direct in damage to the geology, the disturbed soil body is more efficient, the depth of the steel plate pile 2 entering the soil can be obviously increased, and the deeper inserting and striking depth of the steel plate pile 2 is guaranteed.
Specifically, compared with the prior art in which an independent female pile is adopted as a hole guiding steel plate, the steel plate pile 2 required to be inserted and beaten is directly used as the hole guiding female pile in the steel plate pile cofferdam construction method, so that the steel plate pile 2 required to be inserted and beaten is not only a structural component of the cofferdam, but also a female pile for arranging a hole guiding pipe and a grouting pipe and is used as the structural component of the cofferdam, and after the hole guiding is finished, the steel plate pile does not need to be pulled out from a soil layer, so that the construction process is reduced, and meanwhile, the problem that the soil layer structure is damaged in the pulling-out process and the subsequent insertion and beating of the steel plate pile 2 are influenced is avoided.
Specifically, set up the hole guide pipe of vertical setting along its length direction along the web inner wall of steel sheet pile 2, this hole guide pipe is general when adopting water sword and air knife, utilizes fixed buckle to lead the hole pipe fixed along the length direction of steel sheet pile 2, and in about 20cm department apart from the bottom of steel sheet pile 2, at two nozzles of the bottom welding of hole guide pipe, the spout is pointed, and mouth diameter size is about 1cm, will lead the top and the high pressure water pump or the high pressure air pump intercommunication of hole pipe. When the water jet cutter is adopted, the steel sheet pile 2 is driven into a soil layer for 1-2 m by a vibration hammer, then a high-pressure water pump is started, the pressure of the high-pressure water pump is controlled to be 5-10 Mpa, the pressure of a nozzle terminal is kept to be more than 300-500 Mpa, the test or adjustment can be specifically carried out according to the actual situation on site, the construction water jet is carried out to assist the steel sheet pile 2 to sink until the steel sheet pile is driven to the designed elevation, and the steel sheet pile is parked for 5-10s at the designed elevation. When the air knife is adopted, the high-pressure air pump is communicated, after the high-pressure air pump is opened, the pressure of the air pump is controlled to be 3-15 Mpa, the pressure of the terminal of the nozzle is kept to be more than 300-500 Mpa, specifically, the test or adjustment can be carried out according to the actual situation on site, after the pressure of the high-pressure air pump is basically stable, pile sinking is continued until the designed height is reached, and finally, the steel plate pile 2 is parked at the designed height for 5-10s in the same way.
Further, still include before inserting and beating steel sheet pile 2:
coating a waterproof agent on the lock of the steel sheet pile 2;
the waterproof agent comprises Portland cement, quartz sand, anti-seepage fly ash, organosilicon hydrophobic powder, HPMC cellulose, polyurethane single-component double-component I type, polyurethane single-component double-component II type, cement-based infiltration crystallization and polymer cement waterproof coating JS, wherein the mass ratio of each component is 52: 38: 5: 75: 3: 10: 5: 5: 10, the quartz sand comprises 100-mesh quartz sand and 200-mesh quartz sand, and the mass ratio of the 100-mesh quartz sand to the 200-mesh quartz sand is 15: 4.
specifically, for the steel sheet piles 2, the buckling locks which are buckled with each other by the two adjacent steel sheet piles 2 are mainly used for sealing, and the buckling locks are tightly combined and also in rigid contact, so that a large leakage risk exists. Therefore, in order to ensure the tightness of the connection between the lock and the padlock of the steel sheet pile 2 and reduce the possibility of underwater water leakage, before the steel sheet pile 2 is inserted and driven, a waterproof agent is respectively coated on the lock of each steel sheet pile 2, the waterproof agent is a waterproof agent self-prepared for the cofferdam of the type, and the waterproof agent mainly comprises Portland cement, quartz sand, impervious material fly ash, organosilicon hydrophobic powder, HPMC cellulose, polyurethane single-component single-two-component type I, polyurethane single-component two-component type II, cement-based infiltration crystallization and polymer cement waterproof coating JS, wherein the mass ratio of each component is 52: 38: 5: 75: 3: 10: 5: 5: 10, wherein the quartz sand comprises two kinds of quartz sand with different meshes, namely 100-mesh quartz sand and 200-mesh quartz sand. The weight of the silicate cement is 480-540 g, the weight of the quartz sand is 360-400 g, the weight of the anti-material-seepage fly ash is 40-60 g, the weight of the organosilicon hydrophobic powder is 720-760 g, the weight of the HPMC cellulose is 20-40 g, the weight of the polyurethane single-component single-double-component I type is 80-120 g, the weight of the polyurethane single-component double-component II type is 40-60 g, the weight of the cement-based permeable crystallization is 40-60 g, and the weight of the polymer cement waterproof coating JS is 80-120 g.
Further, a plurality of inner supporting structures are arranged from top to bottom in the excavation process, and the method comprises the following steps:
arranging a steel purlin along the inner wall of the steel sheet pile 2 cofferdam;
an inner support structure is arranged on the steel purlin;
and continuously excavating downwards, and sequentially arranging the steel enclosing purlins and the inner supporting structures, wherein the larger the excavating depth is, the smaller the distance between every two adjacent steel enclosing purlins or the inner supporting structures is.
Specifically, after the steel sheet pile 2 is inserted and driven, the steel sheet pile is excavated to a position 0.5m below the bottom elevation of a first inner supporting structure, the first inner supporting structure is installed, after the first inner supporting structure is installed, the steel sheet pile is continuously excavated downwards to a position 0.5m below the bottom of a second inner supporting structure, the second inner supporting structure is installed, after the second inner supporting structure is installed, the steel sheet pile is continuously excavated downwards to a position 0.5m below the bottom of a third inner supporting structure, the third inner supporting structure is installed, the operation is circulated in sequence, generally, according to the scale of most of the current deep foundation pit, four inner supporting structures are probably arranged enough, and the specific number of the inner supporting structures can be determined according to the actual construction depth and the scale. Wherein, because deep basal pit's scale is generally great, in order to guarantee the stability of structure, generally before each intraformational bearing structure of installation, can set up the steel earlier and enclose the purlin structure, enclose the inner support structure that corresponds on the purlin again at the steel to guarantee that the structure has sufficient intensity and steadiness.
Furthermore, when the foundation pit is excavated to about 15m, the finish-rolled threaded steel pull rods are added on the corresponding enclosures to be oppositely pulled. Because the excavation depth is deepened, the soil pressure on two sides is big more, under the effect of soil pressure, the lower part of the steel plate pile 2 has the tendency of inclining in the foundation pit, and the upper part of the steel plate pile 2 has the tendency of inclining all around the foundation pit, but the inner support structure can only provide the inward pressure of the soil body around resisting, can not resist the outward inclination tendency of the top, therefore, the reinforcing steel bar is needed to be adopted to provide the pulling force for the counter-pulling, so as to resist the inclination of the upper part of the steel plate pile 2 to all around the foundation pit, the counter-pulling rod of the finish rolling screw-thread steel can provide enough tensile strength, so that the stress of the foundation pit in the bad stratum is more reasonable, and the safety of the foundation pit is greatly improved. Specifically, after the corresponding enclosing purlins are installed, the steel pipe supports with the flange plates are connected through the reserved bolt holes, the steel pipe supports with the flange plates are connected with the enclosing purlins and the steel sheet piles 2 through finish rolling screw-thread steel, and the steel pipe supports become tension and compression rods under the condition that the steel pipe supports are not affected in dismantling.
The application also provides a steel sheet pile cofferdam for a deep foundation pit, and as shown in fig. 2, the steel sheet pile cofferdam mainly comprises a cofferdam main body 1 and a guide structure 3, wherein the cofferdam main body 1 comprises a plurality of steel sheet piles 2 connected end to end, each steel sheet pile 2 is provided with a hole guiding assembly and a liquid injection assembly, the hole guiding assembly is used for selecting a water knife or an air knife to guide holes alternately according to geological information of a construction site so as to assist the steel sheet piles 2 to be inserted and punched to a preset depth, and the liquid injection assembly is used for injecting bottom sealing concrete towards the bottom of the foundation pit along the outer side wall of the steel sheet pile 2 so as to complete bottom sealing of the foundation pit; guide structure 3 sets up along cofferdam main part 1's circumference, and guide structure 3 is used for leading for steel sheet pile 2 when inserting and beating.
Further, the guide structure 3 comprises a plurality of steel pipe piles, a part of the steel pipe piles are arranged at intervals on the inner sides of the steel pipe piles along the arrangement track of the steel plate piles 2, the rest part of the steel pipe piles are arranged at intervals on the outer sides of the steel pipe piles along the arrangement track of the steel plate piles 2, a plurality of guide i-shaped steels 30 are arranged at the tops of the steel pipe piles on the inner sides and the outer sides, and a plurality of spacing reinforcing bars 31 arranged at intervals are arranged on the guide i-shaped steels 30 on the inner sides and the outer sides in a sliding manner; the guiding h-beam 30 is used for limiting the steel sheet piles 2 to shift in the inward or outward direction during inserting and driving, and the limiting reinforcing bars 31 are used for limiting the steel sheet piles 2 to shift in the left and right directions during inserting and driving.
Further, as for the steel sheet piles 2, the buckling locks which are buckled with each other by two adjacent steel sheet piles are mainly used for sealing, the buckling locks are tightly combined and are also in rigid contact, and a large leakage risk exists. Therefore, in order to ensure the tightness of the connection between the lock and the padlock of the steel sheet pile 2 and reduce the possibility of underwater water leakage, before the steel sheet pile 2 is inserted and driven, a waterproof agent is respectively coated on the lock of each steel sheet pile 2, wherein the waterproof agent comprises portland cement, quartz sand, impervious fly ash, organosilicon hydrophobic powder, HPMC cellulose, polyurethane single-component single-two-component type I, polyurethane single-component two-component type II, cement-based infiltration crystallization and polymer cement waterproof coating JS, and the mass ratio of the components is A: b: c: d: e: f: g: h: i, the quartz sand comprises 100-mesh quartz sand and 200-mesh quartz sand, and the mass ratio of the 100-mesh quartz sand to the 200-mesh quartz sand is 15: 4.
the function implementation of each structure in the steel sheet pile cofferdam corresponds to each step in the construction method of the steel sheet pile cofferdam, and the rest functions and the implementation process are not repeated here.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as the case may be.
It is noted that, in this application, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description is only an example of the present application, and is provided to enable any person skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A steel sheet pile cofferdam construction method for a deep foundation pit is characterized by comprising the following steps:
acquiring geological information of a construction site, and determining a construction area;
arranging a guide structure (3) in the construction area;
sequentially inserting and driving the steel sheet piles (2) under the guidance of the guide structure (3), and selecting water knives or air knives to guide holes alternately according to the obtained geological information in the inserting and driving process so as to assist the steel sheet piles (2) to be inserted and driven to a preset depth;
completing closure of the steel sheet piles (2), excavating the foundation pit, and arranging a plurality of inner supporting structures from top to bottom in the excavation process;
and injecting bottom sealing concrete towards the bottom of the foundation pit along the outer side wall of the steel sheet pile (2) to complete bottom sealing of the foundation pit.
2. The method for constructing the steel sheet pile cofferdam for the deep foundation pit as recited in claim 1, wherein said installing a guide structure (3) at a predetermined position of said construction area comprises the steps of:
sequentially determining inserting and striking points of the steel sheet piles (2) in the construction area;
sequentially inserting and driving a plurality of steel pipe piles on the inner side and the outer side of the determined circle of insertion and driving points along the arrangement track of the insertion and driving points respectively, and arranging guide I-shaped steel (30) on the tops of the steel pipe piles on the inner side and the outer side after insertion and driving;
and a plurality of spacing reinforcing steel bars (31) arranged at intervals are arranged on the guiding I-shaped steel (30) positioned at the inner side and the outer side in a sliding manner.
3. The steel sheet pile cofferdam construction method for deep foundation pit according to claim 2, wherein said inserting steel sheet pile (2) in turn under the guidance of said guiding structure (3), its step further includes:
adjusting one limiting reinforcing bar (31) to one side of the corresponding inserting and striking point;
inserting and driving the steel sheet piles (2), respectively using the guiding I-beams (30) positioned on the inner side and the outer side to jointly assist in correcting the positions of the steel sheet piles (2) in the direction from the inner side to the outer side in the inserting and driving process, and using the limiting reinforcing bars (31) to assist in correcting the positions of the steel sheet piles (2) in the left-right direction.
4. The steel sheet pile cofferdam construction method for the deep foundation pit as set forth in claim 3, wherein said selecting water knife or air knife to alternatively guide the hole according to the obtained geological information in the inserting and driving process to assist the inserting and driving of the steel sheet pile (2) to the preset depth comprises the steps of:
determining the geological information of the current inserting and punching depth, if the geological information of the current inserting and punching depth is hard plastic clay or gravel soil, guiding the hole by adopting a water jet cutter, and if the geological information of the current inserting and punching depth is argillaceous siltstone or strongly weathered rock, guiding the hole by adopting an air knife;
and selecting a water knife or an air knife to alternatively guide holes in the inserting and striking process according to the geological information until the steel sheet pile (2) is inserted and struck to the preset depth.
5. The steel sheet pile cofferdam construction method for deep foundation pit according to claim 1, characterized in that before inserting and driving the steel sheet pile (2) further comprising:
the inner wall of a web plate of the steel sheet pile (2) is provided with a hole guiding pipe which is vertically arranged along the length direction of the inner wall, and the bottom end of the hole guiding pipe is provided with at least two hole guiding nozzles which are arranged downwards;
and a vertically arranged grouting pipe is arranged on the outer wall of the web plate of the steel sheet pile (2) along the length direction of the web plate.
6. The steel sheet pile cofferdam construction method for deep foundation pit according to claim 1, characterized in that before inserting and driving the steel sheet pile (2) further comprising:
a waterproof agent is coated on the lock of the steel sheet pile (2);
the waterproof agent comprises Portland cement, quartz sand, anti-seepage fly ash, organosilicon hydrophobic powder, HPMC cellulose, polyurethane single-component double-component I type, polyurethane single-component double-component II type, cement-based infiltration crystallization and polymer cement waterproof coating JS, wherein the mass ratio of each component is 52: 38: 5: 75: 3: 10: 5: 5: 10, the quartz sand comprises 100-mesh quartz sand and 200-mesh quartz sand, and the mass ratio of the 100-mesh quartz sand to the 200-mesh quartz sand is 15: 4.
7. the steel sheet pile cofferdam construction method for a deep foundation pit as recited in claim 1, wherein said installing a plurality of inner supporting structures from the top to the bottom during the excavation includes the steps of:
arranging a steel purlin along the inner wall of the steel sheet pile (2) cofferdam;
an inner support structure is arranged on the steel purlin;
and continuously excavating downwards, and sequentially arranging the steel enclosing purlins and the inner supporting structures, wherein the larger the excavating depth is, the smaller the distance between every two adjacent steel enclosing purlins or the inner supporting structures is.
8. A steel sheet pile cofferdam for deep basal pit, its characterized in that, it includes:
the cofferdam body (1) comprises a plurality of end-to-end steel sheet piles (2), each steel sheet pile (2) is provided with a hole guiding component and a liquid injection component, the hole guiding components are used for selecting water knives or air knives to guide holes alternately according to geological information of a construction site so as to assist the steel sheet piles (2) to be inserted and punched to a preset depth, and the liquid injection components are used for injecting bottom sealing concrete towards the bottom of a foundation pit along the outer side wall of the steel sheet piles (2) so as to complete bottom sealing of the foundation pit;
and the guide structure (3) is arranged along the circumferential direction of the cofferdam main body (1), and the guide structure (3) is used for guiding the steel sheet piles (2) during inserting and driving.
9. The steel sheet pile cofferdam for deep foundation pit as recited in claim 8, wherein:
the guide structure (3) comprises a plurality of steel pipe piles, one part of the steel pipe piles are arranged at intervals on the inner sides of the steel pipe piles along the arrangement tracks of the steel plate piles (2), the rest part of the steel pipe piles are arranged at intervals on the outer sides of the steel pipe piles along the arrangement tracks of the steel plate piles (2), a plurality of guide I-shaped steels (30) are arranged at the tops of the steel pipe piles on the inner sides and the outer sides, and a plurality of spacing reinforcing steel bars (31) arranged at intervals are arranged on the guide I-shaped steels (30) on the inner sides and the outer sides in a sliding mode;
the guide I-shaped steel (30) is used for limiting the deviation of the steel sheet piles (2) along the inward side or the outward side during inserting and beating, and the limiting reinforcing bars (31) are used for limiting the deviation of the steel sheet piles (2) along the left side and the right side during inserting and beating.
10. The steel sheet pile cofferdam for deep foundation pit as claimed in claim 8, wherein: the waterproof agent is coated on the lock of each steel sheet pile (2), and comprises portland cement, quartz sand, impervious fly ash, organosilicon hydrophobic powder, HPMC cellulose, polyurethane single-component double-component I type, polyurethane single-component double-component II type, cement-based capillary crystallization and polymer cement waterproof coating JS, wherein the mass ratio of each component is 52: 38: 5: 75: 3: 10: 5: 5: 10, the quartz sand comprises 100-mesh quartz sand and 200-mesh quartz sand, and the mass ratio of the 100-mesh quartz sand to the 200-mesh quartz sand is 15: 4.
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