Construction method for steel sheet pile cofferdam in sludge water

Abstract

The invention discloses a construction method of a steel sheet pile cofferdam in muddy water. The construction method comprises the following steps: S1, construction preparation; s2, part of the steel sheet pile single bodies and a guide frame are arranged; s3, the other steel sheet pile single bodies are installed, and therefore the steel sheet pile cofferdam is formed; s4, a plastic film is arranged on the outer side of the steel sheet pile cofferdam; s5, sealing filler is scattered between the steel sheet pile cofferdam and the plastic film, and water in the steel sheet pile cofferdam is discharged; s6, sludge in the steel sheet pile cofferdam is cleaned to the construction elevation; s7, laying bamboo rafts; s8, binding steel bars are arranged, the binding steel bars are connected with the pile foundation steel casing, and then bottom sealing concrete is poured; s9, the bottom sealing concrete is cured, and the bottom sealing concrete is solidified to reach the expected strength; and S10, carrying out bearing platform construction. The plastic film is arranged on the outer side of the steel sheet pile cofferdam, and the sealing filler is arranged between the steel sheet pile cofferdam and the plastic film, so that the double-sealing effect is achieved, and the sealing effect can be effectively improved.

Description

Technical Field

[0001] The invention relates to the technical field of steel sheet pile cofferdams, and in particular to a construction method of a steel sheet pile cofferdam in muddy water. Background Art

[0002] In the long history of bridge construction, the biggest challenge is to build bridge foundations in water. When bridges were first built, the most common foundation types were open excavation and expanded foundations and wooden pile foundations. For bridges over water or bridges on land with abundant surface water, what needs to be dealt with is to overcome the water and soil pressure difference in the construction area and form a waterless construction environment. In the process of responding to this challenge, people gradually developed earth and stone cofferdams, straw bag cofferdams, wooden cofferdams, etc.

[0003] With the development of materials and the advancement of technology, new cofferdam forms such as steel sheet pile cofferdam and locking steel pipe pile cofferdam have been gradually developed. For the existing steel sheet pile cofferdam, both sides of the steel sheet pile are equipped with hook-shaped locks for interlocking adjacent steel sheet piles, so as to form a watertight structure. This structure is widely used in bridge foundation cofferdams, retaining walls, docks, embankment revetments and other projects. It is reusable, green and environmentally friendly, easy to construct and low in cost.

[0004] However, due to the repeated use of existing steel sheet piles, the bites between the steel sheet piles are prone to deformation. When the old steel sheet piles are used for underwater structure construction, the bites between the steel sheet piles are not tight and the water cannot be isolated, resulting in the inability to construct.

[0005] Therefore, there is an urgent need in the art for a method for constructing a steel sheet pile cofferdam in muddy water to solve the above-mentioned problems. Summary of the invention

[0006] The object of the present invention is to provide a method for constructing a steel sheet pile cofferdam in muddy water to solve the problems existing in the above-mentioned prior art. A double sealing effect is achieved by arranging a plastic film on the outside of the steel sheet pile cofferdam and arranging a sealing filler between the steel sheet pile cofferdam and the plastic film, thereby effectively improving the sealing effect of the steel sheet pile cofferdam.

[0007] To achieve the above object, the present invention provides the following solutions:

[0008] The invention discloses a method for constructing a steel sheet pile cofferdam in muddy water, comprising the following steps:

[0009] S1. Construction preparation;

[0010] S2. Install some steel sheet pile units and guide frames;

[0011] S3, installing the remaining steel sheet pile monomers to form a steel sheet pile cofferdam;

[0012] S4, setting a plastic film on the outside of the steel sheet pile cofferdam;

[0013] S5, spreading sealing filler between the steel sheet pile cofferdam and the plastic film, and draining the water in the steel sheet pile cofferdam;

[0014] S6. Clean the silt in the steel sheet pile cofferdam to the construction elevation;

[0015] S7, laying bamboo rafts;

[0016] S8, setting bundled steel bars, connecting the bundled steel bars to the pile foundation steel casing, and then pouring bottom seal concrete;

[0017] S9. Cure the bottom concrete and wait for it to solidify to the expected strength;

[0018] S10. Carry out foundation construction.

[0019] Preferably, the guide frame in step S2 is a enclosure.

[0020] Preferably, the steel sheet pile monomer in step S2 is provided with a corbel, and the enclosure is installed on the corbel.

[0021] Preferably, a middle support is provided in the middle of the enclosure.

[0022] Preferably, in step S4, the plastic film is first installed on the steel rod, and then the plastic film is unfolded in water and wrapped around the outside of the steel sheet pile cofferdam.

[0023] Preferably, the sealing filler in step S5 includes wood chips and / or gravel.

[0024] Preferably, the bundled steel bars in step S8 are fixed to the pile foundation steel casing by welding.

[0025] Preferably, the estimated strength of the bottom sealing concrete in step S9 is 70% of its designed strength.

[0026] Compared with the prior art, the present invention has achieved the following technical effects:

[0027] The present invention realizes double sealing by arranging a plastic film on the outer side of the steel sheet pile cofferdam and arranging a sealing filler between the steel sheet pile cofferdam and the plastic film, thereby effectively improving the sealing effect of the steel sheet pile cofferdam.

[0028] In addition, the present invention is also provided with a bamboo raft, and the provision of the bamboo raft can not only increase the standing space for personnel at the bottom, but also improve the bearing capacity of the bottom sealing concrete, and can also reduce the thickness of the bottom sealing concrete. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 Flow chart of a method for constructing a steel sheet pile cofferdam in muddy water according to an embodiment of the present invention;

[0031] Figure 2 A top view of the construction method of a steel sheet pile cofferdam in muddy water according to an embodiment of the present invention;

[0032] Figure 3 It is a structural entity of a steel sheet pile cofferdam in a method for constructing a steel sheet pile cofferdam in muddy water according to an embodiment of the present invention;

[0033] Figure 4 It is a structural schematic diagram of a steel sheet pile unit in a method for constructing a steel sheet pile cofferdam in muddy water according to an embodiment of the present invention;

[0034] In the figure: 1- steel sheet pile cofferdam; 2- bundled steel bars; 3- enclosure; 4- middle support; 5- pile foundation steel casing; 6- steel sheet pile unit. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] The object of the present invention is to provide a method for constructing a steel sheet pile cofferdam in muddy water to solve the problems existing in the above-mentioned prior art. A double sealing effect is achieved by arranging a plastic film on the outside of the steel sheet pile cofferdam and arranging a sealing filler between the steel sheet pile cofferdam and the plastic film, thereby effectively improving the sealing effect of the steel sheet pile cofferdam.

[0037] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0038] like Figure 1-Figure 4 As shown, this embodiment provides a method for constructing a steel sheet pile cofferdam in muddy water, comprising the following steps:

[0039] S1. Construction preparation: prepare relevant construction materials.

[0040] S2, setting up some steel sheet pile monomers 6 and guide frames, such as first setting up several steel sheet pile monomers 6 near the beginning, end and middle of the steel sheet pile cofferdam 1, and then installing the guide frame.

[0041] S3. Using the guiding function of the guide frame, the remaining steel sheet pile units 6 are installed to form a steel sheet pile cofferdam 1.

[0042] S4. A plastic film is arranged on the outer side of the steel sheet pile cofferdam 1.

[0043] S5. Spread the sealing filler between the steel sheet pile cofferdam 1 and the plastic film, and drain the water in the steel sheet pile cofferdam 1. Specifically, the water inside the steel sheet pile cofferdam 1 can be drained by using a pumping pipe and a pumping pump. One end of the pumping pipe is inserted into the water inside the steel sheet pile cofferdam 1, and then the pumping pump is started. Pumping water creates a water level difference inside and outside the steel sheet pile cofferdam 1, which produces a siphon effect, sucking the sealing filler into the bite between the steel sheet pile monomers 6 to form a bite seal. At the same time, the plastic film is also adsorbed on the outside of the steel sheet pile cofferdam 1, thereby forming a double waterproof layer, so that the steel sheet pile cofferdam 1 is sealed and watertight.

[0044] S6. Clean the silt in the steel sheet pile cofferdam 1 to the construction elevation.

[0045] S7. Bamboo rafts are laid at the bottom of the steel sheet pile cofferdam 1. The bamboo rafts can not only increase the standing space for personnel at the bottom, but also increase the bearing capacity of the bottom sealing concrete and reduce the thickness of the bottom sealing concrete.

[0046] S8, setting the bundled steel bars 2, connecting the bundled steel bars 2 with the pile foundation steel casing 5, and then pouring the bottom sealing concrete.

[0047] S9. Cure the bottom concrete and wait for it to solidify to the expected strength. It should be noted that the expected strength here does not mean 100% complete solidification.

[0048] S10. Carry out subsequent foundation construction.

[0049] In this embodiment, the guide frame in step S2 is the enclosure 3, such as Figure 2 As shown, the enclosure 3 is a rectangular steel bar structure, and its four sides are all H-shaped steel beam structures.

[0050] In this embodiment, a corbel is provided on the steel sheet pile unit 6 in step S2, and the enclosure 3 is installed on the corbel.

[0051] In this embodiment, a middle support 4 is welded in the middle of the enclosure 3 to further enhance its supporting strength.

[0052] In this embodiment, in step S4, the plastic film is first installed on the steel rod, and then the plastic film is unfolded in the water and wrapped around the outer side of the steel sheet pile cofferdam 1. The reason for setting the steel rod is that the plastic film itself is light in weight, and it may be inconvenient to fix it if it is directly placed in the water, and the setting of the steel rod also makes it easier to unfold the plastic film.

[0053] In this embodiment, the sealing filler in step S5 includes wood chips and / or gravel. Such sealing filler is cheap and easily available, thereby reducing construction costs.

[0054] In this embodiment, the bundled steel bars 2 and the pile foundation steel casing 5 in step S8 are fixed by welding.

[0055] In this embodiment, the estimated strength of the bottom sealing concrete in step S9 is 70% of its design strength. Of course, those skilled in the art can also adjust the estimated strength of the bottom sealing concrete according to actual conditions, and is not limited to this.

[0056] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only used to help understand the method and core ideas of the present invention. At the same time, for those skilled in the art, according to the ideas of the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting the present invention.

Claims

1. A method for constructing a steel sheet pile cofferdam in muddy water, characterized in that: The following steps are involved: S1. Construction preparation; S2. Install some steel sheet pile units and guide frames; S3, installing the remaining steel sheet pile monomers to form a steel sheet pile cofferdam; S4, setting a plastic film on the outside of the steel sheet pile cofferdam; S5, spreading sealing filler between the steel sheet pile cofferdam and the plastic film, and draining the water in the steel sheet pile cofferdam; S6. Clean the silt in the steel sheet pile cofferdam to the construction elevation; S7, laying bamboo rafts; S8, setting bundled steel bars, connecting the bundled steel bars to the pile foundation steel casing, and then pouring bottom seal concrete; S9. Cure the bottom concrete and wait for it to solidify to the expected strength; S10. Carry out foundation construction.

2. The method for constructing a steel sheet pile cofferdam in muddy water according to claim 1, characterized in that: The guide frame in step S2 is a enclosure.

3. The method for constructing a steel sheet pile cofferdam in muddy water according to claim 2, characterized in that: In step S2, the steel sheet pile unit is provided with a corbel, and the enclosure is installed on the corbel.

4. The method for constructing a steel sheet pile cofferdam in muddy water according to claim 2, characterized in that: A middle support is provided in the middle of the enclosure.

5. The method for constructing a steel sheet pile cofferdam in muddy water according to claim 1, characterized in that: In step S4, the plastic film is first installed on the steel rod, and then the plastic film is unfolded in water and wrapped around the outer side of the steel sheet pile cofferdam.

6. The method for constructing a steel sheet pile cofferdam in muddy water according to claim 1, characterized in that: The sealing filler in step S5 includes wood chips and / or gravel.

7. The method for constructing a steel sheet pile cofferdam in muddy water according to claim 1, characterized in that: In step S8, the bundled steel bars are fixed to the pile foundation steel casing by welding.

8. The method for constructing a steel sheet pile cofferdam in muddy water according to claim 1, characterized in that: The estimated strength of the bottom sealing concrete in step S9 is 70% of its designed strength.

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