CN110565666A - Construction method of flat combined sheet pile ground connecting wall type water retaining cofferdam - Google Patents
Construction method of flat combined sheet pile ground connecting wall type water retaining cofferdam Download PDFInfo
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- CN110565666A CN110565666A CN201910907189.5A CN201910907189A CN110565666A CN 110565666 A CN110565666 A CN 110565666A CN 201910907189 A CN201910907189 A CN 201910907189A CN 110565666 A CN110565666 A CN 110565666A
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- 238000010276 construction Methods 0.000 title claims abstract description 62
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 31
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 93
- 239000010959 steel Substances 0.000 claims abstract description 93
- 239000002131 composite material Substances 0.000 claims abstract description 45
- 239000004033 plastic Substances 0.000 claims abstract description 43
- 230000002787 reinforcement Effects 0.000 claims abstract description 30
- 239000002002 slurry Substances 0.000 claims abstract description 28
- 239000004567 concrete Substances 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000012360 testing method Methods 0.000 claims abstract description 5
- 239000011150 reinforced concrete Substances 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 4
- 238000005520 cutting process Methods 0.000 claims description 3
- 230000001502 supplementing effect Effects 0.000 claims description 3
- 239000002689 soil Substances 0.000 description 6
- 230000007547 defect Effects 0.000 description 3
- 239000000178 monomer Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 230000003487 anti-permeability effect Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000002990 reinforced plastic Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 235000020681 well water Nutrition 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
Classifications
-
- 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
- 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
-
- 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
- E02D5/20—Bulkheads or similar walls made of prefabricated parts and concrete, including reinforced concrete, in situ
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0023—Cast, i.e. in situ or in a mold or other formwork
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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)
Abstract
A construction method of a flat combined sheet pile and diaphragm wall type water retaining cofferdam combines the construction of a flat plastic steel combined sheet pile and a diaphragm wall, excavates a guide channel, and builds a guide wall (1) along the guide channel; determining the proportion of the slurry (5) through tests, excavating a construction groove at the bottom of the cofferdam position, continuously replenishing the slurry in the process, and excavating to the designed depth; a reinforcement cage (3) is arranged along the construction groove; a vertical guide frame is arranged along the outer side of the steel reinforcement cage (3), the straight plastic steel combined plate pile (2) is vertically abutted against the water facing side of the steel reinforcement cage (3) and is inserted into the slurry (5) section by section; inserting guide pipes (6) are vertically distributed on two sides of the straight plastic steel composite sheet pile (2), and the slurry (5) floats on the upper side of the concrete (4). The straight plastic steel composite sheet pile is combined with the construction of the diaphragm wall, so that the anti-seepage performance is high, the stability is strong, the construction is convenient, reinforcement measures such as high-pressure jet grouting piles are not needed in the later period, the construction time and the cost are saved, the method is particularly suitable for water retaining cofferdam engineering with high anti-seepage performance requirements, and the application prospect is wide.
Description
Technical Field
the invention belongs to a cofferdam construction technology for E02D19/04 hydraulic engineering in IPC classification, relates to a water conservancy project water retaining cofferdam structure, and particularly relates to a straight combined sheet pile ground connecting wall type water retaining cofferdam.
background
The steel sheet pile cofferdam is the most common one. The steel sheet pile is a section steel with locking notch, and its section has straight plate shape, groove shape and Z shape, and has various sizes and interlocking forms. The common forms include Larson type, Lakevanna type, etc. Its advantage does: the strength is high, and the soil can be easily driven into a hard soil layer; the coating can be constructed in deep water and has good waterproof performance; the cofferdams with various shapes can be formed according to the needs, and can be repeatedly used, so that the application is wide. The method is commonly used for cofferdams of sinking well tops, cofferdams of pipe column foundations, pile foundations, open cut foundations and the like in bridge construction. The cofferdams are mainly formed by adopting single-wall closed cofferdams, and longitudinal and transverse supports are arranged in the single-wall closed cofferdams, and inclined supports are added to form a surrounding cage if necessary. In hydraulic construction, the construction area is large, and the construction body cofferdam is usually made of a plurality of interconnected monomers, each monomer is composed of a plurality of steel sheet piles, and the middle of the monomer is filled with soil. The cofferdam has a large range of enclosure, and cannot support the dam wall by using a support, so that each single body can independently resist overturning and sliding and prevent tension cracks at the interlocking part, and the common forms comprise a round shape, a partition wall shape and the like.
in a building foundation pit, a soil and water retaining structure directly bears the action of horizontal load, and common structural forms comprise a high-pressure jet grouting pile, a steel plate pile, a high-strength plastic-steel combined plate pile, a cast-in-place underground continuous wall, a cast-in-place cast-in-situ bored pile, a reinforced concrete gravity retaining wall, a prestressed U-shaped concrete plate pile and the like. The high-strength plastic-steel composite sheet pile has wide application, and can be used for wharfs, retaining walls, flood banks and the like in the aspect of permanent buildings; in the aspect of temporary buildings, the method can be used for building cofferdams, foundation pit enclosures and the like. As one type of the supporting and retaining structure, the high-strength plastic steel composite sheet pile has the advantages of high strength, light weight and the like.
Chinese patent application 201811531297.9 that well water huaihe river planning design research limited company proposed relates to hydraulic and hydroelectric engineering construction cofferdam technical field, specifically provides a steel sheet pile cofferdam suitable for narrow river course complicated geological conditions, including the two rows of cantilever type steel sheet piles of driving into the soil layer, two rows of cantilever type steel sheet piles are retaining side steel sheet pile, foundation ditch side steel sheet pile respectively, be equipped with a plurality of bored concrete piles between retaining side steel sheet pile, the foundation ditch side steel sheet pile, a plurality of bored concrete piles are linked into one row, and the line with retaining side steel sheet pile, foundation ditch side steel sheet pile are parallel, retaining side steel sheet pile inside wall is equipped with the prevention of seepage geomembrane, backfill between retaining side steel sheet pile, the foundation ditch side steel sheet pile, this steel sheet pile cofferdam overall rigidity, stability and waterproof nature are good, can satisfy the operation requirement under the narrow river course complicated geological conditions.
However, the existing high-strength plastic steel composite plate pile cofferdam which has been disclosed still has the defects in the aspects of overall stability and construction convenience:
1) Although the high-strength plastic steel composite sheet pile has good impermeability, when the high-strength plastic steel composite sheet pile is used for a retaining structure, the water pressure at the rear side of the pile is difficult to reduce, and the whole manufacturing cost of the retaining structure is high due to the fact that the pile body needs to bear large horizontal force.
2) under the working condition that the foundation is harder, the piling construction is difficult to be smoothly implemented.
at present, as an improved technology, the construction process of the steel sheet pile cofferdam diaphragm wall is mature day by day, the rigidity of the wall body is high, and the groove is filled with slurry before concrete is poured, so that the difficulty of inserting the high-strength plastic steel composite sheet pile is greatly reduced. However, after the diaphragm wall concrete reaches a certain strength, in order to prevent quality problems such as water leakage at the joint due to incomplete construction at the joint of the diaphragm wall, reinforcement treatment has to be performed at the joint of the diaphragm wall, which significantly increases the construction time and cost.
Disclosure of Invention
The invention aims to provide a straight combined sheet pile ground connecting wall type water retaining cofferdam, which overcomes the defects and solves the problems in the prior art.
In order to realize the technical purpose, the invention adopts the following technical scheme: construct high strength straight combination sheet pile ground and link wall formula manger plate cofferdam, with straight plastic steel combination sheet pile and ground even wall construction combination, include: the steel bar reinforced concrete composite pile comprises a guide wall, a straight plastic steel composite sheet pile, a steel bar cage and concrete; the construction method comprises the following steps:
The method comprises the following steps: excavating a guide channel, and building a guide wall along the guide channel;
Step two: determining the slurry proportion through tests, excavating a construction groove at the bottom of the cofferdam position, continuously supplementing slurry in the process, and stopping excavating after excavating to the designed depth;
Step three: installing a reinforcement cage along the construction groove;
Step four: arranging a vertical guide frame along the outer side of the steel reinforcement cage, vertically abutting the straight plastic steel composite sheet pile against the water facing side of the steel reinforcement cage, inserting the straight plastic steel composite sheet pile into the slurry section by section, and connecting the straight plastic steel composite sheet pile to the steel reinforcement cage 3 through an anchor rod 7;
Step five: inserting guide pipes are vertically distributed on two sides of the straight plastic steel composite sheet pile, concrete is injected into the construction groove along the guide pipes until the height is designed, and slurry floats on the upper side of the concrete.
Particularly, adjacent straight plastic steel composite sheet piles are connected with T-shaped connectors in a cutting mode through grooves, and sealing connection of joint positions is guaranteed.
Particularly, the guide wall adopts a 'L-type' cast-in-place reinforced concrete structure, and the top elevation is 20-30cm higher than the water level.
Particularly, the steel reinforcement cage and the straight plastic steel composite sheet pile are fixedly connected through an anchor rod; wherein, the stock is I-shaped steel bar structure, ensures closely laminating between reinforcement cage and the straight plastic steel composite sheet pile.
Particularly, the upper end of the guide pipe is provided with a funnel, concrete is injected into the construction tank from top to bottom through the guide pipe, and the concrete sinks into the bottom of the tank by utilizing the self weight to replace the original slurry in the tank.
The invention has the advantages and effects that: the construction is convenient, the stability is strong, the anti-seepage performance is high, reinforcement measures such as high-pressure jet grouting piles are not needed in the later period, the construction time and the cost are saved, the method is particularly suitable for water retaining cofferdam engineering with high anti-seepage performance requirements, and the application prospect is wide.
Drawings
fig. 1 is a top view of the flat combined sheet pile ground-connecting-wall type water retaining cofferdam in the embodiment of the invention.
fig. 2 is a schematic vertical sectional view of the flat combined sheet pile ground-connecting-wall type water retaining cofferdam in the embodiment of the present invention.
fig. 3 is a schematic perspective view of a straight plastic-steel composite sheet pile in an embodiment of the invention.
the reference numerals include:
The concrete pile comprises 1-guide wall, 2-straight plastic steel composite sheet pile, 3-reinforcement cage, 4-concrete, 5-slurry, 6-guide pipe, 7-anchor rod, 21-groove and 22-T-shaped connector.
Detailed Description
the principle of the invention lies in that a construction process is innovated, a high-strength straight composite sheet pile and ground connecting wall type water retaining cofferdam is constructed, and the straight plastic steel composite sheet pile and the ground connecting wall are constructed and combined, so that the advantages and the disadvantages can be made up, the high anti-permeability performance is obtained, and the respective defects are overcome.
In the invention, as shown in the attached figure 1, the flat combined sheet pile ground connecting wall type water retaining cofferdam comprises: the steel bar reinforced plastic composite pile comprises a guide wall 1, a straight plastic steel composite sheet pile 2, a steel bar cage 3 and concrete 4.
In the invention, as shown in the attached figure 2, the construction method of the straight combined sheet pile ground connecting wall type water retaining cofferdam comprises the following steps:
The method comprises the following steps: excavating a guide channel, and building a guide wall 1 along the guide channel;
Step two: determining the proportion of the slurry 5 through tests, excavating a construction groove at the bottom of the cofferdam position, continuously supplementing slurry in the process, and stopping excavating after excavating to the designed depth;
Step three: arranging a reinforcement cage 3 along the construction groove;
step four: arranging a vertical guide frame along the outer side of the steel reinforcement cage 3, vertically abutting the straight plastic steel composite sheet pile 2 against the water facing side of the steel reinforcement cage 3, inserting the straight plastic steel composite sheet pile 2 into the slurry 5 section by section, and connecting the straight plastic steel composite sheet pile 2 to the steel reinforcement cage 3 through an anchor rod 7;
Step five: inserting guide pipes 6 are vertically distributed on two sides of the straight plastic steel composite sheet pile 2, concrete 4 is injected into the construction groove along the guide pipes 6 until the designed height is reached, and slurry 5 floats on the upper side of the concrete 4.
the following is further illustrated by examples and figures.
Example (b): as shown in fig. 1, 2 and 3, adjacent straight plastic steel composite sheet piles 2 are connected in a cutting mode through grooves 21 and T-shaped connectors 22, and sealing connection of joint parts is guaranteed.
in the foregoing, lead wall 1 and adopt "| -L" type cast-in-place reinforced concrete structure, the top elevation is higher than the water level 20-30 cm.
in the above, the reinforcement cage 3 and the straight plastic steel composite sheet pile 2 are fixedly connected through the anchor rod 7; wherein, stock 7 is I-shaped steel bar structure, ensures closely laminating between steel reinforcement cage 3 and straight plastic steel composite sheet pile 2.
In the above, the funnel is arranged at the upper end of the guide pipe 6, the concrete 4 is poured into the construction tank from top to bottom through the guide pipe 6, and the concrete 4 sinks into the bottom of the tank by self weight to replace the original slurry 3 in the tank.
In the embodiment of the invention, the straight plastic steel composite sheet pile 2 is made of high-strength plastic steel and is in a straight plate shape, the vertical edges at two ends are respectively provided with the groove 21 and the T-shaped connector 22, more than two straight plastic steel composite sheet piles 2 are connected in a matching way through the groove 21 and the T-shaped connector 22, and the sealing connection of joint parts can be effectively ensured through mechanical occlusion. The slurry 3 is continuously filled in the construction groove digging process, and the effect of stabilizing and supporting the groove wall can be achieved. The insertion accuracy of the straight plastic steel composite sheet pile 2 is improved by utilizing the construction guide frame, and the straight plastic steel composite sheet pile 2 is ensured to be vertically inserted into the slurry 5. The straight plastic steel composite sheet pile 2 is arranged on the water facing side, is tightly attached to the reinforcement cage 3, is integrally cast with the diaphragm wall, and finally serves as a part of a reinforcement protection layer, so that the seepage-proofing performance of the diaphragm wall is greatly improved.
in the embodiment of the invention, the concrete construction steps are as follows:
firstly, a specific construction area is planned before construction, a field is leveled, a guide channel is excavated after the construction is carried out, and then the construction of the guide wall 1 is carried out. After the construction of the guide wall 1 is finished, the proportion of the slurry 5 is determined through tests, the construction of the construction groove is started, and the slurry is continuously supplemented in the groove digging process. And after digging to the designed depth, cleaning the residue soil and the deposited slurry at the bottom. After the cleaning work is finished, the joint pipes and the reinforcement cage 3 are arranged. After the hoisting operation is completed, a construction guide frame is laid, the straight plastic steel composite plate piles 2 are tightly attached to the water-facing side of the steel reinforcement cage 3, the mud 5 is inserted section by section, and the adjacent straight plastic steel composite plate piles 2 are connected with the T-shaped connector 22 in a matched mode through the grooves 21 and are connected to the steel reinforcement cage 3 through the anchor rods 7. And after the concrete 4 is poured to the designed height, completing the construction of the groove section, and repeating the steps until the construction of all the groove sections is completed.
In the embodiment of the invention, the leveling requirement of the site, the pouring and maintenance requirement of the guide wall 1, the technical requirement of the proportion of the slurry 5, the concrete process requirements of the hoisting of the reinforcement cage 3, the grooving construction and the flat plastic steel composite sheet pile 2 construction, the pouring requirement of the concrete 4 in the groove and the like are carried out according to the general technical standard in the construction process.
Claims (5)
1. A construction method of a straight composite sheet pile and ground connecting wall type water retaining cofferdam is characterized in that the high-strength straight composite sheet pile and ground connecting wall type water retaining cofferdam is constructed, and a straight plastic steel composite sheet pile is combined with the construction of the ground connecting wall, and the construction method comprises the following steps: the steel bar reinforced concrete composite pile comprises a guide wall (1), a straight plastic steel composite sheet pile (2), a steel bar cage (3) and concrete (4); the construction method comprises the following steps:
The method comprises the following steps: excavating a guide channel, and building a guide wall (1) along the guide channel;
Step two: determining the proportion of the slurry (5) through tests, excavating a construction groove at the bottom of the cofferdam position, continuously supplementing the slurry in the process, and stopping excavating after the slurry is excavated to the designed depth;
Step three: a reinforcement cage (3) is arranged along the construction groove;
Step four: arranging a vertical guide frame along the outer side of the steel reinforcement cage (3), vertically abutting the straight plastic-steel combined sheet pile (2) against the water facing side of the steel reinforcement cage (3), inserting the straight plastic-steel combined sheet pile into the slurry (5) section by section, and connecting the straight plastic-steel combined sheet pile (2) to the steel reinforcement cage (3) through an anchor rod (7);
Step five: inserting guide pipes (6) are vertically distributed on two sides of the straight plastic steel composite plate pile (2), concrete (4) is injected into the construction groove along the guide pipes (6) until the designed height is reached, and slurry (5) floats on the upper side of the concrete (4).
2. The construction method of the flat combined sheet pile ground-wall type water retaining cofferdam of claim 1, characterized in that adjacent flat plastic steel combined sheet piles (2) are connected in a cutting way through the groove (21) and the T-shaped connector (22) to ensure the sealing connection of the joint parts.
3. The construction method of the flat combined sheet pile ground wall-connecting type water retaining cofferdam of claim 1, wherein the guide wall (1) adopts a reversed L-type cast-in-place reinforced concrete structure, and the top elevation is 20-30cm higher than the water level.
4. The construction method of the flat combined sheet pile ground-wall-connecting type water-retaining cofferdam of claim 1, characterized in that the reinforcement cage (3) and the flat plastic steel combined sheet pile (2) are fixedly connected through an anchor rod (7); wherein, the anchor rod (7) is of an I-shaped steel bar structure, so that the steel reinforcement cage (3) is tightly attached to the straight plastic steel composite sheet pile (2).
5. the construction method of the flat combined sheet pile ground-connecting wall type water retaining cofferdam of claim 1, characterized in that the upper end of the conduit (6) is provided with a funnel, the conduit (6) injects concrete (4) into the construction groove from top to bottom, the concrete (4) sinks into the bottom of the groove by self-weight, and the original slurry (3) in the groove is replaced.
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| CN201910907189.5A CN110565666A (en) | 2019-09-24 | 2019-09-24 | Construction method of flat combined sheet pile ground connecting wall type water retaining cofferdam |
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| CN201910907189.5A CN110565666A (en) | 2019-09-24 | 2019-09-24 | Construction method of flat combined sheet pile ground connecting wall type water retaining cofferdam |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111364447A (en) * | 2020-03-27 | 2020-07-03 | 哈尔滨工业大学 | Permanent multifunctional underground continuous wall and construction method thereof |
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