CN115478549B - Construction method of strong water-permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam - Google Patents
Construction method of strong water-permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam Download PDFInfo
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- CN115478549B CN115478549B CN202211017574.0A CN202211017574A CN115478549B CN 115478549 B CN115478549 B CN 115478549B CN 202211017574 A CN202211017574 A CN 202211017574A CN 115478549 B CN115478549 B CN 115478549B
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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
- 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
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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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
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
- E02D5/24—Prefabricated piles
- E02D5/28—Prefabricated piles made of steel or other metals
- E02D5/285—Prefabricated piles made of steel or other metals tubular, e.g. prefabricated from sheet pile elements
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a construction method of a strong water-permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam, which comprises the following steps: firstly, arranging a water injection grouting integrated pipeline and a lock catch on a steel pipe pile, and arranging a round integrated steel pipe on the steel sheet pile; step two, measuring and positioning; positioning the inserting and driving position of the first steel pipe pile, lowering the steel pipe pile, hammering and sinking, and jetting water along the water jetting and grouting integrated pipeline by a high-pressure water pump in the sinking process until the steel pipe pile is sunk to the designed elevation; sinking construction is carried out on the first steel sheet pile; fifth, repeating the third step and the fourth step, sequentially sinking the steel pipe pile and the steel sheet pile at intervals, and removing the high-pressure water injection system after the steel pipe pile and the steel sheet pile are completed; step six, connecting to a water injection grouting integrated pipeline through a grouting machine, and grouting all the steel pipe piles; and seventhly, excavating a cofferdam foundation pit and installing a surrounding purlin support after grouting is completed. The cofferdam construction method can improve the cofferdam pile sinking efficiency and the water stopping performance of the locking position of the cofferdam.
Description
Technical Field
The invention relates to the field of civil engineering bridge foundation construction. More particularly, the invention relates to a construction method of a strong water-permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam.
Background
In recent years, china enters a high-quality development period, a bridge construction technology is innovated continuously, and particularly, a complex cofferdam design is adopted for adapting to special stratum structures of a plurality of rivers, lakes and weak soil layers, so that the technical requirements on the cofferdam are higher and higher. The existing foundation cofferdam has various structures, such as earth-rock cofferdam, steel pipe (plate) pile cofferdam, steel sleeve box cofferdam, concrete pile, waterproof curtain and concrete meshed pile support. However, when the cofferdam is in deep water, large water head difference and strong permeable stratum, the cofferdam structure has certain limitations: the earth-rock cofferdam is suitable for an operation environment with shallower water depth and smaller flow velocity; the locking steel pipe (plate) piles are suitable for cofferdams with water head difference less than 10 m; the steel sleeve box is suitable for cofferdams with water head difference more than 10m, but needs large-scale hoisting equipment and has high cost; the concrete pile row and the waterproof curtain have poor water stopping effect in the strong permeable stratum, the construction period of the concrete meshed pile row support is long, the progress requirement is high, the concrete pile support can cause later dismantling difficulty, materials are wasted, and certain pollution exists to a river channel.
In the existing foundation cofferdam structure, the steel sheet pile and steel pipe pile combined cofferdam structure is also quite common, the overall rigidity is quite good, meanwhile, the foundation cofferdam structure also has the advantages of being high in construction speed, reliable in quality, capable of being repeatedly used, good in economical efficiency and the like, but in pile sinking construction, pile sinking difficulty is caused if dense soil is encountered, meanwhile, in a strong permeable stratum, a lock catch position can not effectively stop water if the lock catch position can cause a certain risk for subsequent construction. The existing cofferdam construction is aimed at a construction structure and a construction method which are efficient in pile sinking, effective in water stopping and the like and have no system, or is complex in working procedure, high in implementation difficulty and low in operation efficiency.
Disclosure of Invention
The invention aims to provide a construction method of a strong water-permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam, which improves cofferdam pile sinking efficiency and improves water stopping performance of lock catches of the cofferdam.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided a construction method of a steel pipe pile and steel sheet pile combined cofferdam for a strong water permeable strata lock catch, comprising the steps of:
firstly, arranging water injection grouting integrated pipelines on steel pipe piles, arranging lock catches on two opposite sides of the steel pipe piles, and arranging round integrated steel pipes on the steel sheet piles;
measuring and positioning according to the cofferdam design, and placing a guide frame;
connecting a high-pressure water pump of a high-pressure water injection system to the water injection grouting integrated pipeline through a hose, positioning the insertion and driving position of the first steel pipe pile, hoisting the first steel pipe pile to the position above a preset pile position, lowering the steel pipe pile, hammering and sinking, and injecting water along the water injection grouting integrated pipeline through the high-pressure water pump in the sinking process to realize auxiliary pile sinking until the sinking reaches a designed elevation;
after the construction of the first steel pipe pile is completed, sinking the first steel pipe pile along the side face of the first steel pipe pile, carrying out sinking construction in the same step three, and connecting the first steel pipe pile and the first steel pipe pile into a whole through a lock catch;
fifth, repeating the third step and the fourth step, and sequentially sinking the steel pipe piles and the steel sheet piles at intervals until all the steel pipe piles and the steel sheet piles are constructed, and removing the high-pressure water injection system;
step six, after the combined cofferdam is folded, connecting the combined cofferdam to a water injection grouting integrated pipeline through a grouting machine of a grouting system, and grouting all steel pipe piles;
and seventhly, excavating a cofferdam foundation pit and installing a surrounding purlin support after grouting is completed.
Preferably, the water jet grouting integrated pipeline comprises a pipeline and an annular steel pipe, the pipeline is vertically arranged on the outer side wall of the steel pipe pile, the annular steel pipe is arranged at the bottom of the inner side wall of the steel pipe pile, a plurality of vertical holes are formed in the bottom of the annular steel pipe, the bottom of the pipeline is communicated with the annular steel pipe through an L-shaped communicated steel pipe, and the high-pressure water pump and the grouting machine are connected to the top of the pipeline.
Preferably, the pipeline is provided with a pair of pipelines and is oppositely arranged on the outer side wall of the steel pipe pile, the pair of pipelines are respectively arranged beside the pair of catches on the steel pipe pile, the pipeline comprises an open circular steel pipe and an arc steel plate, an opening is formed on the side surface of the open circular steel pipe and faces towards the catches, the arc steel plate is just matched with the opening to seal the open circular steel pipe, and the length of the arc steel plate is smaller than that of the open circular steel pipe, wherein the sixth step specifically comprises:
6.1, extracting an arc-shaped steel plate in the high-pressure opening circular steel pipe, connecting the high-pressure water pump with the opening circular steel pipe again, injecting water through the high-pressure water pump, flushing the soil body around the lock catch by using the high-pressure water, and removing the high-pressure water pump after the soil body around the lock catch and the water in the opening circular steel pipe are mixed into slurry;
6.2, discharging the slurry through a hole cleaning device of the grouting system;
6.3, connecting the grouting machine with the open circular steel tube, starting the grouting machine to perform grouting, filling the open circular steel tube with the grouting material, filling the periphery of the lock catch and the bottom of the steel tube pile with the grouting material, and waiting for solidification;
and 6.4, repeatedly grouting to finish the construction of the open circular steel pipe at the position where each steel pipe pile is locked and connected with the steel sheet pile.
Preferably, the high-pressure water injection system further comprises a displacement sensor and a controller, and the displacement sensor and the controller are used for controlling water injection pressure, specifically:
the displacement sensor and the controller are arranged between the high-pressure water pump and the water injection grouting integrated pipeline, the displacement sensor is used for detecting pile sinking displacement, the controller is used for connecting the displacement sensor and acquiring data of the displacement sensor, and the controller is also used for controlling water injection pressure of the high-pressure water pump;
when the controller monitors that pile sinking displacement acquired by the displacement sensor is smaller than a set value, the controller sends a signal to enhance high-pressure water injection pressure of the high-pressure water pump, and the high-pressure water injection pressure is impacted to soil at the edge foot of the steel pipe pile through a vertical hole of an annular pipeline at the bottom of the steel pipe pile, so that the soil at the bottom of the steel pipe pile is in a temporary loosening state under the impact of high-pressure water flow, and the penetration resistance is reduced, so that efficient pile sinking is realized; when the controller monitors that pile sinking displacement acquired by the displacement sensor is larger than or equal to a set value, the controller sends out a signal to reduce the high-pressure water injection pressure of the high-pressure water pump.
Preferably, the opening round steel pipe is inwards concave Cheng Kacao towards two sides at the opening, and two sides of the arc-shaped steel plate are just matched in the clamping groove.
Preferably, a rubber pad is arranged on the contact surface between the opening circular steel tube and the arc-shaped steel plate.
Preferably, the upper part of the arc-shaped steel plate is provided with a lifting hole.
Preferably, the upper cambered surface and the lower cambered surface of the annular steel pipe are respectively provided with a circle of wedge-shaped steel plates.
Preferably, the bottom of the L-shaped communicating steel pipe located outside the steel pipe pile is provided with a tapered steel plate.
The invention at least comprises the following beneficial effects:
1. the cofferdam structure of the utility model greatly improves pile sinking efficiency of steel pipe pile and steel sheet pile, simultaneously guarantees cofferdam water stopping performance through grouting, avoids the problem that mud sand around the underwater excavation cofferdam and the pile casing is difficult to clean in place, ensures the flatness of back cover concrete, and reduces the investment consumption of the back cover concrete.
2. The high-pressure water injection system and the grouting system in the application share one pipeline, the structure is simple, the operability is high, the investment of materials is also saved, the cost investment is reduced, meanwhile, the high-pressure water injection can cause the soil body at the bottom of the steel sheet pile to be in a loose state, and certain anchoring can be performed on the bottom through grouting, so that the cofferdam structure is more reliable and stable.
3. The cofferdam construction of the strong permeable stratum is simple, economical and wide in applicability, has considerable reference value in the field of similar engineering construction, and provides important technical assurance for bridge engineering foundation construction.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a plan view of a combined cofferdam structure of a steel pipe pile and a steel sheet pile of the present invention;
FIG. 2 is a plan view of the combined cofferdam after the water jet grouting integrated pipeline is installed;
FIG. 3 is a detailed elevation view of a steel pipe pile after installation of the water jet grouting integrated pipeline of the invention;
FIG. 4 is a plan view of an open circular steel tube according to the present invention;
FIG. 5 is an elevation view of an open circular steel tube according to the present invention;
FIG. 6 is a schematic diagram of the operation of the high pressure water jet system of the present invention;
fig. 7 is a schematic diagram of the operation of the grouting system of the present invention.
Reference numerals illustrate:
1-lock catches, 2-opening round steel pipes, 3-arc steel plates, 4-annular steel pipes, 5-vertical holes, 6-conical steel plates, 7-L-shaped communicated steel pipes, 8-lifting holes, 9-round integrated steel pipes, 10-wedge-shaped steel plates, 11-steel pipe piles, 12-steel plate piles, 13-high-pressure water injection systems and 14-grouting systems.
Detailed Description
The present invention is described in further detail below with reference to the drawings to enable those skilled in the art to practice the invention by referring to the description.
It should be noted that the experimental methods described in the following embodiments, unless otherwise specified, are all conventional methods, and the reagents and materials, unless otherwise specified, are all commercially available; in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus are not to be construed as limiting the present invention.
Example 1
Referring to fig. 1 to 7, the invention provides a construction method of a strong water permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam, which comprises the following steps:
firstly, after the materials of a steel pipe pile 11 and a steel sheet pile 12 enter a field, processing a water injection grouting integrated pipeline, welding the water injection grouting integrated pipeline on the steel pipe pile 11 after the processing is finished, arranging the water injection grouting integrated pipeline on the steel pipe pile 11, arranging lock catches 1 on two opposite sides of the steel pipe pile 11, and arranging a round integrated steel pipe 9 on the steel sheet pile 12; as shown in fig. 1, a plurality of steel pipe piles 11 and steel sheet piles 12 are combined to form a cofferdam structure, two adjacent steel pipe piles 11 are connected with the steel sheet piles 12 through C9 type lock catches 1, water injection and grouting integrated pipelines are arranged on the steel pipe piles 11, water injection and grouting integrated construction is realized, and round integrated steel pipes 9 are arranged on the steel sheet piles 12 and are used for realizing water injection construction;
the water injection grouting integrated pipeline comprises a pipeline and an annular steel pipe 4, the pipeline is vertically arranged on the outer side wall of the steel pipe pile 11, the annular steel pipe 4 is arranged at the bottom of the inner side wall of the steel pipe pile 11, a plurality of vertical holes 5 are formed in the bottom of the annular steel pipe 4, and the bottom of the pipeline is communicated with the annular steel pipe 4 through an L-shaped communicated steel pipe 7; in order to ensure the influence of soil resistance in the sinking and pulling-out process of the annular steel pipe 4, the upper cambered surface and the lower cambered surface of the annular steel pipe 4 are respectively provided with a circle of wedge-shaped steel plates 10; in order to ensure that the open circular steel pipe 2 can smoothly sink when the high-pressure water jet system 13 works, the bottom of the L-shaped communicated steel pipe 7, which is positioned outside the steel pipe pile 11, is provided with a conical steel plate 6 which is welded;
measuring and positioning according to the cofferdam design on site, and placing a guide frame;
connecting a high-pressure water pump of the high-pressure water injection system 13 to a water injection grouting integrated pipeline through a hose, namely connecting the high-pressure water pump with a top wire port of the pipeline, hoisting a vibrating hammer by a crawler crane, positioning the inserting and driving position of the first steel pipe pile 11, hoisting the first steel pipe pile 11 to the position above a preset pile position by a steel wire rope, lowering the steel pipe pile 11, hammering and vibrating to sink, and injecting water along the water injection grouting integrated pipeline by the high-pressure water pump in the sinking process to realize auxiliary pile sinking until the pile sinking reaches a design elevation; the high-pressure water or slurry sequentially passes through the pipeline, the L-shaped communicated steel pipe 7 and the annular steel pipe 4, and high-pressure water injection and grouting integrated construction of the steel pipe pile 11 is carried out through the vertical hole 5 at the bottom of the annular steel pipe 4; the high-pressure water jetting system 13 further comprises a water tank, a displacement sensor and a controller, the grouting system 14 further comprises a hole cleaning device which is a conventional device and is not described in detail herein;
after the construction of the first steel pipe pile 11 is completed, sinking the first steel plate pile 12 along the side surface of the first steel pipe pile 11, wherein the sinking construction is the same as the third step, and the steel pipe pile 11 and the steel plate pile 12 are connected into a whole through the lock catch 1; the grouting system 14 is not arranged in the pile sinking process of the steel sheet pile 12, and the water injection grouting integrated pipeline in the high-pressure water injection system 13 in the steel pipe pile 11 is replaced by a round integrated steel pipe 9, the round integrated steel pipe 9 is arranged in the middle of the steel sheet pile 12 through welding, and pile sinking of the steel pipe pile 11 and the steel sheet pile 12 is realized through high-pressure water injection;
fifth, repeating the third step and the fourth step, and sequentially sinking the steel pipe piles 11 and the steel sheet piles 12 at intervals until all the steel pipe piles 11 and the steel sheet piles 12 are constructed, and removing the high-pressure water injection system 13;
step six, after the combined cofferdam is folded, connecting the combined cofferdam to a water injection and grouting integrated pipeline through a grouting machine of a grouting system 14, grouting all the steel pipe piles 11, and realizing the bottom sealing and anchoring of the bottoms of the steel pipe piles 11 through grouting;
and seventhly, excavating a cofferdam foundation pit and installing a surrounding purlin support after grouting is completed.
Example 2
On the basis of embodiment 1, in the high-pressure water injection construction of the third and fourth steps, as shown in fig. 6, the high-pressure water injection system 13 further includes a displacement sensor and a controller for controlling water injection pressure, specifically:
the displacement sensor and the controller are arranged between the high-pressure water pump and the water injection grouting integrated pipeline, the displacement sensor is used for detecting pile sinking displacement, namely, the pile sinking displacement is converted into the footage speed through calculation of the controller, the controller is used for connecting the displacement sensor and acquiring data of the displacement sensor, and the controller is also used for controlling the water injection pressure of the high-pressure water pump; the controller parameters can be adjusted through pile sinking summary data of the first steel pipe pile 11 during site construction, and the release pressure of high-pressure water injection is determined;
when the controller detects that pile sinking displacement acquired by the displacement sensor is smaller than a set value, namely, the controller detects that the pile sinking footage of the vibrating hammer is slow, the controller sends a signal to enhance the high-pressure water injection pressure of the high-pressure water pump, and the vertical hole 5 of the annular pipeline at the bottom of the steel pipe pile 11 impacts the soil body at the edge foot of the steel pipe pile 11, so that the soil body at the bottom of the steel pipe pile 11 becomes a temporary loosening state under the impact of high-pressure water flow, and the penetration resistance is reduced, thereby realizing high-efficiency pile sinking; when the controller detects that the pile sinking displacement obtained by the displacement sensor is larger than or equal to a set value, namely that the pile sinking footage of the vibrating hammer is normal, the controller sends out a signal to reduce the high-pressure water injection pressure of the high-pressure water pump.
Example 3
Based on the embodiment 1, the specific structure of the pipeline in the water jet grouting integrated pipeline in the third step is as follows: the pipeline is provided with a pair of pipelines which are oppositely arranged on the outer side walls of the steel pipe pile 11, the pair of pipelines are respectively arranged beside the pair of catches 1 on the steel pipe pile 11, the pipeline comprises an open circular steel pipe 2 and an arc steel plate 3, an opening is formed on the side surface of the open circular steel pipe 2 and faces towards the catches 1, the arc steel plate 3 is just matched with the opening to seal the open circular steel pipe 2, and the length of the arc steel plate 3 is smaller than that of the open circular steel pipe 2; in order to realize the water stop at the lock catch 1, the pipeline is provided with a pair of pipelines and is formed by a two-part structure, and the arc-shaped steel plate 3 can be inserted into the opening of the opening circular steel tube 2, so that the two pipelines can be freely installed and detached. The circular steel tube 2 with the opening is concave Cheng Kacao towards two sides at the opening, and two sides of the arc-shaped steel plate 3 are just matched in the clamping grooves, so that the arc-shaped steel plate 3 can be freely installed and detached in the clamping grooves at two sides and has a limiting effect. The upper part of the arc-shaped steel plate 3 is provided with a lifting hole 8 for connecting lifting devices such as a crawler crane.
As shown in fig. 7, on the basis of embodiment 1, the step six specifically includes:
and 6.1, after the combined cofferdam is folded, performing water stopping treatment on the joint of the lock catch 1, modifying the grouting system 14 by using the high-pressure water injection system 13, removing the high-pressure water pump, the water tank, the displacement controller, the sensor and the like, and extracting the arc-shaped steel plate 3 in the high-pressure opening circular steel tube 2 by using the crawler crane, wherein the lifting point is a lifting hole 8 at the upper part of the arc-shaped steel plate 3. Because sand is contained around the lock catch 1 and in the lock catch 1, the water stopping effect is affected by direct grouting, so that the high-pressure water pump is connected with the open circular steel pipe 2 again, the open side just corresponds to the position of the lock catch 1 and the surrounding soil body, the surrounding soil body of the lock catch 1 is flushed by high-pressure water, at the moment, the surrounding soil body is mixed with water in the open circular steel pipe to form slurry, and the high-pressure water pump is released;
6.2, discharging the slurry through a hole cleaning device of the grouting system 14;
6.3, connecting a grouting machine with the open circular steel tube 2, starting the grouting machine to perform grouting, filling the open circular steel tube 2 with slurry, filling the periphery of the lock catch 1 and the bottom of the steel tube pile 11 with slurry at the moment, and waiting for solidification;
and 6.4, repeating grouting to finish the construction of the open circular steel pipe 2 at the connecting position of each steel pipe pile 11 and the steel sheet pile 12 lock catch 1.
Although embodiments of the present invention have been disclosed above, it is not limited to the details and embodiments shown and described, it is well suited to various fields of use for which the invention would be readily apparent to those skilled in the art, and accordingly, the invention is not limited to the specific details and illustrations shown and described herein, without departing from the general concepts defined in the claims and their equivalents.
Claims (7)
1. The construction method of the strong water-permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam is characterized by comprising the following steps of:
firstly, arranging water injection grouting integrated pipelines on steel pipe piles, arranging lock catches on two opposite sides of the steel pipe piles, and arranging round integrated steel pipes on the steel sheet piles;
measuring and positioning according to the cofferdam design, and placing a guide frame;
connecting a high-pressure water pump of a high-pressure water injection system to the water injection grouting integrated pipeline through a hose, positioning the insertion and driving position of the first steel pipe pile, hoisting the first steel pipe pile to the position above a preset pile position, lowering the steel pipe pile, hammering and sinking, and injecting water along the water injection grouting integrated pipeline through the high-pressure water pump in the sinking process to realize auxiliary pile sinking until the sinking reaches a designed elevation;
after the construction of the first steel pipe pile is completed, sinking the first steel pipe pile along the side face of the first steel pipe pile, carrying out sinking construction in the same step three, and connecting the first steel pipe pile and the first steel pipe pile into a whole through a lock catch;
fifth, repeating the third step and the fourth step, and sequentially sinking the steel pipe piles and the steel sheet piles at intervals until all the steel pipe piles and the steel sheet piles are constructed, and removing the high-pressure water injection system;
step six, after the combined cofferdam is folded, connecting the combined cofferdam to a water injection grouting integrated pipeline through a grouting machine of a grouting system, and grouting all steel pipe piles;
step seven, after grouting is completed, the excavation of a cofferdam foundation pit and the supporting installation of an enclosing purlin can be carried out;
the water injection grouting integrated pipeline comprises a pipeline and an annular steel pipe, the pipeline is vertically arranged on the outer side wall of the steel pipe pile, the annular steel pipe is arranged at the bottom of the inner side wall of the steel pipe pile, a plurality of vertical holes are formed in the bottom of the annular steel pipe, the bottom of the pipeline is communicated with the annular steel pipe through an L-shaped communicated steel pipe, and the high-pressure water pump and the grouting machine are connected to the top of the pipeline;
the pipeline set up a pair of and set up relatively in the lateral wall of steel-pipe pile, a pair of pipeline set up respectively in a pair of hasp side on the steel-pipe pile, the pipeline includes opening circular steel pipe and arc steel sheet, the side of opening circular steel pipe is formed with the opening, and it is towards the hasp sets up, the arc steel sheet just cooperates in the opening place with opening circular steel pipe seals, the length of arc steel sheet is less than the length of opening circular steel pipe, wherein step six specifically includes:
6.1, extracting an arc-shaped steel plate in the high-pressure opening circular steel pipe, connecting the high-pressure water pump with the opening circular steel pipe again, injecting water through the high-pressure water pump, flushing the soil body around the lock catch by using the high-pressure water, and removing the high-pressure water pump after the soil body around the lock catch and the water in the opening circular steel pipe are mixed into slurry;
6.2, discharging the slurry through a hole cleaning device of the grouting system;
6.3, connecting the grouting machine with the open circular steel tube, starting the grouting machine to perform grouting, filling the open circular steel tube with the grouting material, filling the periphery of the lock catch and the bottom of the steel tube pile with the grouting material, and waiting for solidification;
and 6.4, repeatedly grouting to finish the construction of the open circular steel pipe at the position where each steel pipe pile is locked and connected with the steel sheet pile.
2. The construction method of the strong water permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam as set forth in claim 1, wherein the high pressure water jet system further comprises a displacement sensor and a controller for controlling water jet pressure, specifically:
the displacement sensor and the controller are arranged between the high-pressure water pump and the water injection grouting integrated pipeline, the displacement sensor is used for detecting pile sinking displacement, the controller is used for connecting the displacement sensor and acquiring data of the displacement sensor, and the controller is also used for controlling water injection pressure of the high-pressure water pump;
when the controller monitors that pile sinking displacement acquired by the displacement sensor is smaller than a set value, the controller sends a signal to enhance high-pressure water injection pressure of the high-pressure water pump, and the high-pressure water injection pressure is impacted to soil at the edge foot of the steel pipe pile through a vertical hole of an annular pipeline at the bottom of the steel pipe pile, so that the soil at the bottom of the steel pipe pile is in a temporary loosening state under the impact of high-pressure water flow, and the penetration resistance is reduced, so that efficient pile sinking is realized; when the controller monitors that pile sinking displacement acquired by the displacement sensor is larger than or equal to a set value, the controller sends out a signal to reduce the high-pressure water injection pressure of the high-pressure water pump.
3. The construction method of the combined cofferdam of the steel pipe pile and the steel sheet pile with the strong water permeable stratum lock catch according to claim 1, wherein the opening circular steel pipe is concave Cheng Kacao towards two sides at the opening, and two sides of the arc steel plate are just matched in the clamping groove.
4. The construction method of the strong water permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam as set forth in claim 1, wherein a rubber pad is arranged at the contact surface between the open circular steel pipe and the arc-shaped steel plate.
5. The construction method of the strong water permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam as set forth in claim 1, wherein the upper part of the arc-shaped steel plate is provided with a hoisting hole.
6. The construction method of the combined cofferdam of the steel pipe pile and the steel sheet pile with the strong water permeable stratum lock catch according to claim 1, wherein the upper cambered surface and the lower cambered surface of the annular steel pipe are respectively provided with a circle of wedge-shaped steel plates.
7. The construction method of the strong water permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam as set forth in claim 1, wherein the bottom of the L-shaped communicated steel pipe, which is positioned outside the steel pipe pile, is provided with a conical steel plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211017574.0A CN115478549B (en) | 2022-08-23 | 2022-08-23 | Construction method of strong water-permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211017574.0A CN115478549B (en) | 2022-08-23 | 2022-08-23 | Construction method of strong water-permeable stratum lock catch steel pipe pile and steel sheet pile combined cofferdam |
Publications (2)
| Publication Number | Publication Date |
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| CN115478549A CN115478549A (en) | 2022-12-16 |
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| JP2562124B2 (en) * | 1991-12-04 | 1996-12-11 | 新日本製鐵株式会社 | Steel pipe sheet pile, sealing material used for this steel pipe sheet pile, and well pipe construction method using the steel pipe sheet pile |
| JPH06228946A (en) * | 1993-02-05 | 1994-08-16 | Kawatetsu Metal Fuaburika Kk | Steel sheet-pile, and water stop method by steel sheet-pile wall constructed therewith |
| JP3030488B2 (en) * | 1994-07-29 | 2000-04-10 | 利根地下技術株式会社 | Steel pipe sheet pile method with pipe type junction |
| GB2322658A (en) * | 1997-02-27 | 1998-09-02 | Dew Group Limited | Sheet pile seal |
| JP2000192446A (en) * | 1998-12-24 | 2000-07-11 | Nippon Steel Corp | Steel sheet pile and method for constructing steel-sheet pile wall |
| JP2001073357A (en) * | 1999-09-07 | 2001-03-21 | Tobishima Corp | Coffering structure and constructing method therefor |
| JP3668410B2 (en) * | 2000-04-11 | 2005-07-06 | 株式会社テクノパウダルトン | Water stop method |
| KR100381454B1 (en) * | 2000-05-06 | 2003-04-26 | (주)이화기술단 | The sheet pile with water proof grouting groove and injection method of water proof grouting |
| JP4113150B2 (en) * | 2004-03-30 | 2008-07-09 | 鹿島建設株式会社 | Water stop method for steel pipe sheet pile joints |
| CN201224882Y (en) * | 2008-03-25 | 2009-04-22 | 何富荣 | Hydraulic inserting plate injection pipe and over-water pipe |
| KR101069815B1 (en) * | 2008-12-31 | 2011-10-04 | 대림산업 주식회사 | Post grouting system of Cast-in-place concrete piles and the post grouting method for increasing end bearing capacity at pile base |
| JP5167302B2 (en) * | 2010-04-01 | 2013-03-21 | 新日鐵住金株式会社 | Steel pile placing method including deaeration process |
| CN102535439A (en) * | 2011-11-24 | 2012-07-04 | 东南大学 | Steel sheet pile joint structure |
| CN108612111B (en) * | 2018-05-22 | 2021-04-06 | 张利均 | Steel pipe pile, foundation pit support structure and construction method of foundation pit support structure |
| CN208309566U (en) * | 2018-06-04 | 2019-01-01 | 上海林同炎李国豪土建工程咨询有限公司 | A kind of water-stopping steel sheet pile |
| CN109751065B (en) * | 2019-01-18 | 2019-10-29 | 东北大学 | A kind of splicing steel pipe and the pin-connected panel pipe curtain structure support system construction method using splicing steel pipe |
| CN214423343U (en) * | 2021-02-20 | 2021-10-19 | 中铁广州工程局集团深圳工程有限公司 | Lock catch steel pipe pile |
| CN217204099U (en) * | 2022-02-25 | 2022-08-16 | 上海新地海洋工程技术有限公司 | Steel-pipe pile lateral wall slip casting device |
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