CN114108601A - Construction method of Larsen steel sheet pile - Google Patents
Construction method of Larsen steel sheet pile Download PDFInfo
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- CN114108601A CN114108601A CN202111626222.0A CN202111626222A CN114108601A CN 114108601 A CN114108601 A CN 114108601A CN 202111626222 A CN202111626222 A CN 202111626222A CN 114108601 A CN114108601 A CN 114108601A
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 119
- 239000010959 steel Substances 0.000 title claims abstract description 119
- 238000010276 construction Methods 0.000 title claims abstract description 46
- 238000009412 basement excavation Methods 0.000 claims abstract description 7
- 238000003466 welding Methods 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 32
- 239000002689 soil Substances 0.000 claims description 24
- 239000000463 material Substances 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000006096 absorbing agent Substances 0.000 claims description 3
- 238000010009 beating Methods 0.000 claims description 3
- 239000002131 composite material Substances 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000003203 everyday effect Effects 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 239000004519 grease Substances 0.000 claims description 3
- 238000012544 monitoring process Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 3
- 239000011248 coating agent Substances 0.000 claims description 2
- 238000000576 coating method Methods 0.000 claims description 2
- 238000005520 cutting process Methods 0.000 abstract description 4
- 230000001788 irregular Effects 0.000 abstract description 3
- 230000002093 peripheral effect Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 7
- 238000007689 inspection Methods 0.000 description 5
- 230000002262 irrigation Effects 0.000 description 4
- 238000003973 irrigation Methods 0.000 description 4
- 238000006073 displacement reaction Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 238000011179 visual inspection Methods 0.000 description 1
Classifications
-
- 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
-
- 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
- E02D7/02—Placing by driving
- E02D7/06—Power-driven drivers
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D9/00—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof
- E02D9/02—Removing sheet piles bulkheads, piles, mould-pipes or other moulds or parts thereof by withdrawing
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Composite Materials (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
The invention discloses a construction method of a Larsen steel sheet pile, which comprises the following steps: determining a base line → positioning a pile → driving a steel plate pile → taking measures before earth excavation → finishing civil engineering → pulling out the steel plate pile. The plane arrangement shape of the foundation pit retaining wall steel sheet pile is as straight and regular as possible, and irregular corners are avoided, so that the standard steel sheet pile is utilized and supported. The peripheral dimensions conform to the sheet pile modulus as much as possible. During the whole construction period, in the construction operations of digging, hoisting, binding steel bars, pouring concrete and the like, collision support is strictly forbidden, random support dismantling is forbidden, random cutting and electric welding on the support are forbidden, and weights are not required to be placed on the support.
Description
Technical Field
The invention particularly relates to a construction method of a Larsen steel sheet pile.
Background
The main mechanical equipment and materials for the construction of the conventional Larsen steel sheet pile are as follows: (1) crawler excavators (retrofit), hydraulic vibratory hammers, excavators, cranes, and the like; (2) materials: according to the Larsen steel plate model and the steel plate length required by design. After the main body construction is finished and the foundation pit is backfilled, the steel sheet pile needs to be pulled out so as to be used repeatedly. Before removing the steel sheet pile, the pile-removing method sequence, pile-removing time and soil hole treatment should be carefully studied. Otherwise, due to the influence of vibration of pile pulling and excessive soil carried by the pile pulling, ground settlement and displacement can be caused, and damage can be brought to the constructed structure. It is very important to try to reduce the soil carried by pile pulling, and irrigation and sand irrigation measures are mainly adopted at present.
Disclosure of Invention
The purpose of the invention is as follows: in order to solve the defects of the prior art, the invention provides a construction method of a Larsen steel sheet pile.
The technical scheme is as follows: a construction method of a Larsen steel sheet pile comprises the following steps: determining a base line → positioning a pile → driving a steel plate pile → taking measures before earth excavation → finishing civil engineering → pulling out the steel plate pile; wherein:
and (3) driving the steel sheet piles:
(1) adopting Larsen steel sheet piles required by the design of the whole line, adopting a crawler-type excavator to carry out driving on the Larsen steel sheet piles, knowing the conditions of underground pipelines and structures before driving, and carefully releasing the accurate central line of the support pile;
(2) before piling, the steel sheet piles are checked one by one, and the steel sheet piles which are rusted and seriously deformed at the connecting locking notch are removed, so that unqualified steel sheet piles can be used after being trimmed;
(3) before piling, coating grease in the locking notch of the steel sheet pile to facilitate driving and pulling out;
(4) measuring and monitoring the inclination of each pile at any time in the inserting and driving process to be not more than 2%, and pulling and re-driving when the inclination is too large and cannot be adjusted by a pulling and aligning method;
(5) constructing the steel sheet piles by adopting a screen type driving method; the screen type driving method is not easy to cause buckling, torsion, inclination and wall surface concave-convex of the sheet pile, has high driving precision and is easy to realize closed folding; during construction, 10-20 steel sheet piles are inserted into the guide frame in rows to form a screen shape, and then construction is carried out; usually, a group of steel sheet piles at two ends of the screen wall are driven to a designed elevation or a certain depth, the verticality is strictly controlled, the steel sheet piles are fixed on a purlin by electric welding, and then the steel sheet piles are driven into the purlin at 1/3 or 1/2 plate piles in sequence in the middle;
the construction and driving sequence of the screen type driving method is one of the keys of the sheet pile construction process, and the selection principle is as follows: when the sheet piles arranged at the two ends of the screen wall are inclined reversely, the sheet piles are driven in a forward sequence; otherwise, beating in reverse sequence; when the sheet piles at the two ends of the screen wall are kept vertical, the sheet piles can be driven in a reciprocating sequence; when the length of the sheet pile wall is long, the sheet pile wall can be constructed in a composite sequence;
in a word, the driving sequence is changed according to specific conditions in the construction, one or more driving sequences are adopted, the sheet piles are driven to the designed elevation step by step, and the depth of one-time driving is 0.5-3.0 m;
(6) tightly buckling and ensuring that the soil penetration is not less than 2 m after excavation, and ensuring that the steel sheet pile is smoothly folded; particularly, four corners of the working well are sealed by using corner steel sheet piles, and auxiliary measures such as old tires or broken cloth for plugging seams and the like are used if the corner steel sheet piles are not used;
(7) after the pile is driven, the water-blocking performance of the pile body is checked in time, the water leakage position is welded and repaired, and a specially-assigned person is dispatched every day to check the pile body.
As an optimization: the steel sheet pile is pulled out: pile pulling by adopting a vibration hammer: the forced vibration generated by the vibration hammer is utilized to disturb soil quality, cohesive force of soil around the steel sheet pile is damaged to overcome pile pulling resistance, and the pile is pulled out under the action of additional lifting force;
pile pulling starting points and sequence: for the closed steel sheet pile wall, the pile pulling starting point is more than 5 piles away from the corner piles. The pile pulling starting point can be determined according to the condition during pile sinking, and a jump-pulling method can be used if necessary, wherein the pile pulling sequence is opposite to that during pile driving;
rapping and vibrating: when the pile is pulled out, a vibrating hammer can be used for vibrating the locking opening of the sheet pile to reduce the adhesion of soil, then the sheet pile is pulled out while vibrating, the sheet pile which is difficult to pull out can be vibrated down by 100-mm plus material by a diesel hammer, then the sheet pile and the vibrating hammer are alternately vibrated and pulled out, sometimes, in order to timely backfill the soil hole after the pile is pulled out, the pulling is suspended when the sheet pile is pulled out to be slightly higher than a base bottom plate, the vibrating hammer is used for vibrating for a few minutes, and the soil hole is filled to the greatest extent;
thirdly, the crane is gradually loaded along with the starting of the vibration hammer, and the lifting force is generally slightly smaller than the compression limit of the shock absorber spring;
fourthly, the power supply used by the vibration hammer is 1.2 to 2.0 times of the rated power of the vibration hammer;
fifthly, adopting an intermittent vibration method to pull and pull the steel sheet pile with larger resistance, wherein each vibration is 15min, and the vibration hammer is continuously not more than 1.5 h.
Has the advantages that: the plane arrangement shape of the foundation pit retaining wall steel sheet pile is as straight and regular as possible, and irregular corners are avoided, so that the standard steel sheet pile is utilized and supported. The peripheral dimensions conform to the sheet pile modulus as much as possible. During the whole construction period, in the construction operations of digging, hoisting, binding steel bars, pouring concrete and the like, collision support is strictly forbidden, random support dismantling is forbidden, random cutting and electric welding on the support are forbidden, and weights are not required to be placed on the support.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below so that those skilled in the art can better understand the advantages and features of the present invention, and thus the scope of the present invention will be more clearly defined. The embodiments described herein are only a few embodiments of the present invention, rather than all embodiments, and all other embodiments that can be derived by one of ordinary skill in the art without inventive faculty based on the embodiments described herein are intended to fall within the scope of the present invention.
Examples
1. Construction process flow
A construction method of a Larsen steel sheet pile comprises the following steps: determining a base line → positioning a pile → driving a steel plate pile → taking measures before earth excavation → finishing civil engineering → pulling out the steel plate pile.
2. The main construction technical points
Inspection, hoisting and stacking of steel sheet piles
(1) Inspection of steel sheet piles
For the steel sheet pile, generally there are material inspection and visual inspection to rectify the steel sheet pile that does not meet the demands, in order to reduce the difficulty in the pile driving process.
Checking the appearance: including surface imperfections, length, width, thickness, height, end squareness, flatness, and keyhole shape.
During the examination, attention is paid to:
a) cutting off the welding parts influencing the driving of the steel sheet pile;
b) reinforcing the cut hole and the fracture surface defect;
c) if the steel sheet pile is rusted seriously, the actual section thickness of the steel sheet pile is measured. In principle, all steel sheet piles are subjected to an appearance inspection.
Material quality inspection: and comprehensively testing the chemical components and the mechanical properties of the steel sheet pile parent metal. The method comprises the following items of chemical composition analysis of steel, tensile and bending tests of a member, a lock notch strength test, an elongation test and the like. At least one tensile and bending test is carried out on each specification of steel sheet piles. Two test piece tests should be carried out for every 20-50t steel sheet pile.
(2) Steel sheet pile handling
Two-point hanging is suitable for loading and unloading the steel sheet piles. During hoisting, the number of the steel sheet piles hoisted each time is not required to be excessive, and the locking notch is protected from being damaged. The hoisting modes comprise bundled hoisting and single hoisting. The bundled lifting is usually tied up by steel cables, and the single lifting is usually carried by a special lifting appliance.
(3) Piling steel sheet piles: the place for piling the steel sheet piles is selected on a flat and firm place which does not have large sinking deformation due to the weight, and the steel sheet piles are convenient to transport to a piling construction site. When stacking, attention should be paid to:
firstly, the stacking sequence, position, direction, plane arrangement and the like are convenient for later construction;
piling the steel sheet piles according to the types, the specifications and the lengths, and arranging a label explanation at the piling position;
and thirdly, the steel sheet piles are stacked in layers, the stacking quantity of each layer is generally not more than 5, sleepers are arranged among layers, the spacing between the sleepers is generally 3-4 meters, the upper and lower layers of the sleepers are arranged on the same vertical line, and the total height of the stacked piles is not more than 2 meters.
3. Mounting of guides
In the construction of steel sheet piles, in order to ensure the correct axial position of a pile sinking and the verticality of the pile, control the driving precision of the pile, prevent the buckling deformation of the sheet pile and improve the penetration capability of the pile, a firm guide frame with certain rigidity is generally required to be arranged, and the guide frame is also called as a construction purlin.
The guide frame adopts the two-sided form of individual layer, comprises the nose girder and encloses purlin stake etc. usually, encloses the interval of purlin stake and generally is 2.5 ~ 3.5 meters, and the interval between the two-sided wall of enclosing is should not too big, generally slightly than sheet pile wall thickness 8 ~ 15 mm.
When installing the guide frame, the following points should be noted:
(1) the position of the guide beam is controlled and adjusted by a theodolite and a level gauge.
(2) The height of the guide beam is proper, which is beneficial to controlling the construction height of the steel sheet pile and improving the construction efficiency.
(3) The guide beam can not sink and deform along with the driving of the steel sheet pile.
(4) The guide beam should be positioned as vertically as possible and not collide with the steel sheet pile.
4. Steel sheet pile driving
The Larsen steel sheet pile construction is one of the most critical processes of engineering construction due to construction water stopping and safety, and the following construction related requirements need to be paid attention in the construction:
(1) and adopting Larsen steel sheet piles required by design in a full-line mode. The Larsen steel sheet pile is driven by a crawler excavator (with a vibration hammer), the conditions of underground pipelines and structures must be known before driving, and the accurate central line of the support pile is carefully released.
(2) Before piling, the steel sheet piles are checked one by one, the steel sheet piles which are rusted and seriously deformed at the connecting locking notch are removed, and unqualified steel sheet piles can be used after being trimmed.
(3) Before piling, grease is coated in the locking notch of the steel sheet pile so as to facilitate driving and pulling out.
(4) And measuring and monitoring the inclination of each pile at any time in the inserting and striking process to be not more than 2%, and pulling and striking when the inclination is too large and cannot be adjusted by a pulling and aligning method.
(5) The steel sheet pile is driven by a screen type driving method. The screen type driving method is not easy to cause buckling, torsion, inclination and wall surface concave-convex of the sheet pile, has high driving precision and is easy to realize closed folding. During construction, 10-20 steel sheet piles are inserted into the guide frame in rows to form a screen shape, and then the steel sheet piles are driven. Usually, a group of steel sheet piles at two ends of the screen wall are driven to a designed elevation or a certain depth, the verticality is strictly controlled, the steel sheet piles are fixed on the purlin by electric welding, and then the steel sheet piles are driven into the purlin at 1/3 or 1/2 sheet pile heights in sequence in the middle.
The construction sequence of the screen type driving method comprises a forward sequence, a reverse sequence, a reciprocating sequence, a middle-dividing sequence, a neutralizing sequence and a compounding sequence. The construction sequence has direct influence on the verticality, displacement, expansion in the axial direction, the concave-convex of the sheet pile wall and the piling efficiency. Therefore, the driving sequence is one of the key points of the sheet pile construction process. The selection principle is as follows: when the sheet piles arranged at the two ends of the screen wall are inclined reversely, the sheet piles are driven in a forward sequence; otherwise, beating in reverse sequence; when the sheet piles at the two ends of the screen wall are kept vertical, the sheet piles can be driven in a reciprocating sequence; when the length of the sheet pile wall is long, the sheet pile wall can be constructed in a composite sequence.
In a word, the driving sequence is changed according to specific conditions in construction, one or more driving sequences are adopted, the sheet piles are driven to the designed elevation step by step, and the depth of one driving is generally 0.5-3.0 m.
The tolerance standards for driving the steel sheet piles are shown in the following table:
TABLE 1 Standard table of tolerance of piling of steel sheet pile
| Item | Allowable tolerance |
| Deviation of sheet pile axis | ±10cm |
| Elevation of pile top | ±10cm |
| Verticality of sheet pile | 1％ |
(6) Tightly buckling and ensuring that the soil penetration is not less than 2 m after excavation, and ensuring that the steel sheet pile is smoothly folded; in particular, corner steel sheet piles are used at four corners of the working well, and if the corner steel sheet piles are not used, auxiliary measures such as old tires or broken cloth for sealing seams are used for sealing.
(7) After the pile is driven, the water-blocking performance of the pile body is checked in time, the water leakage position is welded and repaired, and a specially-assigned person is dispatched every day to check the pile body.
5. Removing steel sheet piles
After the main body construction is finished and the foundation pit is backfilled, the steel sheet pile needs to be pulled out so as to be used repeatedly. Before removing the steel sheet pile, the pile-removing method sequence, pile-removing time and soil hole treatment should be carefully studied. Otherwise, due to the influence of vibration of pile pulling and excessive soil carried by the pile pulling, ground settlement and displacement can be caused, and damage can be brought to the constructed structure. It is very important to try to reduce the soil carried by pile pulling, and irrigation and sand irrigation measures are mainly adopted at present.
(1) Pile pulling method
This engineering pile pulling adopts the vibration hammer pile pulling: the forced vibration generated by the vibration hammer disturbs the soil quality, destroys the cohesive force of the soil around the steel sheet pile to overcome the pile pulling resistance, and pulls out the pile by the action of additional lifting force.
(2) Attention should be paid to pile pulling
Pile pulling starting points and sequence: for the closed steel sheet pile wall, the pile pulling starting point is more than 5 piles away from the corner piles. The pile pulling starting point can be determined according to the condition of pile sinking, and a jump pulling method can be used if necessary. The pile pulling sequence is preferably reversed from that for piling.
Rapping and vibrating: when the pile is pulled out, the sheet pile locking opening can be vibrated by a vibration hammer to reduce the adhesion of soil, and then the pile is pulled out while vibrating. For the sheet pile which is difficult to pull out, the diesel hammer can be used for vibrating the pile for 100-300 mm, and then the pile and the vibration hammer are alternately vibrated and pulled out. Sometimes, in order to backfill the soil hole after pile pulling in time, when the sheet pile is pulled to be slightly higher than the foundation bottom plate, the pulling is suspended, and a vibration hammer is used for vibrating for a few minutes to fill a part of the soil hole as much as possible.
Thirdly, the crane is gradually loaded along with the starting of the vibration hammer, and the lifting force is generally slightly smaller than the compression limit of the shock absorber spring.
Fourthly, the power supply used by the vibration hammer is 1.2 to 2.0 times of the rated power of the vibration hammer.
Fifthly, adopting an intermittent vibration method to pull and pull the steel sheet pile with larger resistance, wherein each vibration is 15min, and the vibration hammer is continuously not more than 1.5 h.
The plane arrangement shape of the foundation pit retaining wall steel sheet pile is as straight and regular as possible, and irregular corners are avoided, so that the standard steel sheet pile is utilized and supported. The peripheral dimensions conform to the sheet pile modulus as much as possible. During the whole construction period, in the construction operations of digging, hoisting, binding steel bars, pouring concrete and the like, collision support is strictly forbidden, random support dismantling is forbidden, random cutting and electric welding on the support are forbidden, and weights are not required to be placed on the support.
Claims (2)
1. A construction method of Larsen steel sheet piles is characterized by comprising the following steps: the method comprises the following steps: determining a base line → positioning a pile → driving a steel plate pile → taking measures before earth excavation → finishing civil engineering → pulling out the steel plate pile; wherein:
and (3) driving the steel sheet piles:
(1) adopting Larsen steel sheet piles required by the design of the whole line, adopting a crawler-type excavator to carry out driving on the Larsen steel sheet piles, knowing the conditions of underground pipelines and structures before driving, and carefully releasing the accurate central line of the support pile;
(2) before piling, the steel sheet piles are checked one by one, and the steel sheet piles which are rusted and seriously deformed at the connecting locking notch are removed, so that unqualified steel sheet piles can be used after being trimmed;
(3) before piling, coating grease in the locking notch of the steel sheet pile to facilitate driving and pulling out;
(4) measuring and monitoring the inclination of each pile at any time in the inserting and driving process to be not more than 2%, and pulling and re-driving when the inclination is too large and cannot be adjusted by a pulling and aligning method;
(5) constructing the steel sheet piles by adopting a screen type driving method; the screen type driving method is not easy to cause buckling, torsion, inclination and wall surface concave-convex of the sheet pile, has high driving precision and is easy to realize closed folding; during construction, 10-20 steel sheet piles are inserted into the guide frame in rows to form a screen shape, and then construction is carried out; usually, a group of steel sheet piles at two ends of the screen wall are driven to a designed elevation or a certain depth, the verticality is strictly controlled, the steel sheet piles are fixed on a purlin by electric welding, and then the steel sheet piles are driven into the purlin at 1/3 or 1/2 plate piles in sequence in the middle;
the construction and driving sequence of the screen type driving method is one of the keys of the sheet pile construction process, and the selection principle is as follows: when the sheet piles arranged at the two ends of the screen wall are inclined reversely, the sheet piles are driven in a forward sequence; otherwise, beating in reverse sequence; when the sheet piles at the two ends of the screen wall are kept vertical, the sheet piles can be driven in a reciprocating sequence; when the length of the sheet pile wall is long, the sheet pile wall can be constructed in a composite sequence;
in a word, the driving sequence is changed according to specific conditions in the construction, one or more driving sequences are adopted, the sheet piles are driven to the designed elevation step by step, and the depth of one-time driving is 0.5-3.0 m;
(6) tightly buckling and ensuring that the soil penetration is not less than 2 m after excavation, and ensuring that the steel sheet pile is smoothly folded; particularly, four corners of the working well are sealed by using corner steel sheet piles, and auxiliary measures such as old tires or broken cloth for plugging seams and the like are used if the corner steel sheet piles are not used;
(7) after the pile is driven, the water-blocking performance of the pile body is checked in time, the water leakage position is welded and repaired, and a specially-assigned person is dispatched every day to check the pile body.
2. The construction method of the larsen steel sheet pile according to claim 1, wherein: the steel sheet pile is pulled out: pile pulling by adopting a vibration hammer: the forced vibration generated by the vibration hammer is utilized to disturb soil quality, cohesive force of soil around the steel sheet pile is damaged to overcome pile pulling resistance, and the pile is pulled out under the action of additional lifting force;
pile pulling starting points and sequence: for the closed steel sheet pile wall, the pile pulling starting point is more than 5 piles away from the corner piles. The pile pulling starting point can be determined according to the condition during pile sinking, and a jump-pulling method can be used if necessary, wherein the pile pulling sequence is opposite to that during pile driving;
rapping and vibrating: when the pile is pulled out, a vibrating hammer can be used for vibrating the locking opening of the sheet pile to reduce the adhesion of soil, then the sheet pile is pulled out while vibrating, the sheet pile which is difficult to pull out can be vibrated down by 100-mm plus material by a diesel hammer, then the sheet pile and the vibrating hammer are alternately vibrated and pulled out, sometimes, in order to timely backfill the soil hole after the pile is pulled out, the pulling is suspended when the sheet pile is pulled out to be slightly higher than a base bottom plate, the vibrating hammer is used for vibrating for a few minutes, and the soil hole is filled to the greatest extent;
thirdly, the crane is gradually loaded along with the starting of the vibration hammer, and the lifting force is generally slightly smaller than the compression limit of the shock absorber spring;
fourthly, the power supply used by the vibration hammer is 1.2 to 2.0 times of the rated power of the vibration hammer;
fifthly, adopting an intermittent vibration method to pull and pull the steel sheet pile with larger resistance, wherein each vibration is 15min, and the vibration hammer is continuously not more than 1.5 h.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111626222.0A CN114108601A (en) | 2021-12-28 | 2021-12-28 | Construction method of Larsen steel sheet pile |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111626222.0A CN114108601A (en) | 2021-12-28 | 2021-12-28 | Construction method of Larsen steel sheet pile |
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| CN114108601A true CN114108601A (en) | 2022-03-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030180A (en) * | 2022-06-24 | 2022-09-09 | 中建二局第一建筑工程有限公司 | Complex foundation pit supporting construction process |
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| CN113737796A (en) * | 2021-09-07 | 2021-12-03 | 江苏兴宇建设集团有限公司 | Construction method for high-pressure water flushing assisted pile driving and pile pulling synchronous grouting of steel plate pile |
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2021
- 2021-12-28 CN CN202111626222.0A patent/CN114108601A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113737796A (en) * | 2021-09-07 | 2021-12-03 | 江苏兴宇建设集团有限公司 | Construction method for high-pressure water flushing assisted pile driving and pile pulling synchronous grouting of steel plate pile |
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| Title |
|---|
| 付洪岭: "拉森钢板桩支护在市政管线深槽施工中的应用", 《市政技术》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115030180A (en) * | 2022-06-24 | 2022-09-09 | 中建二局第一建筑工程有限公司 | Complex foundation pit supporting construction process |
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