Water stop material of deepwater single-wall steel sheet pile cofferdam lock catch

Abstract

The invention relates to a water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock catch, which is formed by fully stirring and mixing epoxy resin and saw dust and is used for the abutted seam of the deepwater single-wall steel sheet pile cofferdam lock catch. The epoxy resin is low-molecular liquid bisphenol A epoxy resin; the mass ratio of the epoxy resin to the sawdust is 8: 2. According to the present invention, the lock catch can be subjected to large-area sealing by using the fluidity and the water stability of the epoxy resin, the saw dust is driven to flow, and the saw dust can completely expand to block the incompletely sealed position after entering the water by using the water absorption expansion property of the saw dust, such that the mixture is simple and rapid to prepare, and especially the saw dust material almost does not require the cost; the sealing material is suitable for large-scale application in the deepwater single-wall steel sheet pile cofferdam lock catch sealing process in the building industry and belongs to a special sealing material.

Description

Technical Field

[0001] The invention relates to a water-stopping material for a deep-water single-wall steel sheet pile cofferdam lock buckle. Background Art

[0002] At present, most of the small and medium-sized bridges constructed in deep water areas of cities and towns use single-wall steel sheet pile cofferdams. This approach can save a lot of financial and time costs compared with other steel sheet pile cofferdams while meeting the construction of the bridge substructure. However, during the construction of single-wall steel sheet pile cofferdams in deep water areas, it is often found that the lock at the bottom is prone to leakage. The existing repair method is for frogmen to go into the water to repair, which increases the construction cost.

[0003] At present, rubber and resin materials are mostly used for cofferdam lock seals. Rubber materials have high durability but poor fluidity. Their sealing properties are often not as good as resin materials. They are not suitable for single-wall steel sheet pile cofferdam lock seals in deep water areas. Resin materials have good fluidity and sealing properties, but their excessive fluidity and high viscosity will affect their sealing properties and cause trouble for later cleaning.

[0004] The water-stopping materials of the lock buckle of the single-wall steel sheet pile cofferdam need to be specially designed and configured, mainly to ensure the waterproof effect and improve the water-stopping performance during the construction process. During the construction process, the steel sheet piles are connected by the lock mouth to form a closed structure, but there are often tiny gaps at the lock mouth, which may cause water penetration and affect the quality and safety of the project. Therefore, in order to prevent leakage, water-stopping materials such as butter, asphalt or other sealing materials are usually embedded in the lock mouth to enhance the sealing of the lock mouth. The selection and configuration of water-stopping materials also take into account the convenience of construction and the need for later maintenance. Specially designed and configured water-stopping materials are to ensure that the single-wall steel sheet pile cofferdam can be effectively waterproofed in a complex construction environment while meeting the quality and safety requirements of the project. Summary of the invention

[0005] In view of the easy leakage problem of the existing single-wall steel sheet pile cofferdam locking water-stopping materials in the prior art, the purpose of the present invention is to provide a deep-water single-wall steel sheet pile cofferdam locking water-stopping material that can achieve better water-stopping effect while taking into account the convenience of construction and the subsequent maintenance requirements.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock buckle, characterized in that: the water-stopping material is made by fully stirring and mixing epoxy resin and sawdust, and is used for the joints of the deepwater single-wall steel sheet pile cofferdam lock buckle; the epoxy resin is a low-molecular liquid bisphenol A epoxy resin; the mass ratio of the epoxy resin to the sawdust is 8:2.

[0007] As a preference, the sawdust is new sawdust.

[0008] As a preference, the size of the sawdust particles is 0.1-0.5 mm.

[0009] As a preferred embodiment, the sealing width at the locking joint of the single-wall steel sheet pile cofferdam is 0.4-0.6cm; the thickness is 1.0-1.2cm. The sealing width is the width extended after the material is applied to the gap. Preferably, the sealing width is 0.58cm; the thickness is 1.1cm.

[0010] As a preferred method, the steel sheet pile cofferdam lock buckle is pre-treated before the cofferdam construction to enhance the self-waterproofing ability of the lock buckle position and improve the purity of the water-stop material after application. The pre-treatment mainly uses a broom and a hair dryer to clean the surface and gaps of the steel sheet pile lock buckle.

[0011] As a preferred embodiment, the fluidity of epoxy resin is used to drive sawdust to move around various parts of the lock joint, and the water absorption and expansion characteristics of sawdust are used to improve the caulking and water-stopping ability of the water-stopping material.

[0012] The principle of the present invention is as follows: before the construction of the lock connection of the single-wall steel sheet pile cofferdam, the steel sheet pile lock is pre-treated to enhance the self-waterproofing ability of the lock position and improve the purity of the water-stopping material after coating; a water-stopping material mixed with epoxy resin and sawdust is used, especially the best ratio of epoxy resin and sawdust is prepared, the water absorption and expansion characteristics of sawdust are fully utilized to enhance the caulking and water-stopping ability of the water-stopping material, and then an appropriate amount of sawdust solids is used to make the fluidity and viscosity of the epoxy resin reach an optimal value; after the leakage point is found in the later stage, the water-stopping is enhanced by re-coating the water-stopping mixture.

[0013] The present invention has the following advantages: 1. Configure a new deep-water single-wall steel sheet pile cofferdam lock buckle special water-stopping material, use the fluidity of epoxy resin to drive sawdust to move in various parts of the lock buckle joints, and then use the characteristics of sawdust absorbing water and expanding to improve the caulking water-stopping ability of the water-stopping material.

[0014] 2. Prepare the best ratio of epoxy resin and sawdust. Under the optimal state, the average leakage of the anti-seepage performance at the joint is reduced from 1.887L / m·d of the traditional process to 0.264L / m·d, so that the deep-water single-wall steel sheet pile cofferdam has a better water-stopping effect; the adhesion of the water-stopping material can be guaranteed, and the fluidity of the water-stopping material is reduced from 98.5cm3 / min of the traditional process to 28.3cm3 / min, which meets the bonding strength requirements and avoids the bonding and sealing being loose due to excessive fluidity of the sealing material during later use.

[0015] 3. The material preparation method is simple and easy to understand. Weigh the epoxy resin and sawdust and stir them thoroughly.

[0016] 4. Through pre-construction pretreatment and the preparation of the best ratio of epoxy resin and new sawdust mixture, the construction quality can be improved under specific construction conditions and the construction task can be completed. On the basis of traditional technology, the water-stopping property of the deep-water single-wall steel sheet pile cofferdam joints (leakage volume reduced by 1.623L / m·d) and the adhesion of the water-stopping material (fluidity reduced by 70.2cm3 / min) are improved to ensure the water-stopping performance of the deep-water single-wall steel sheet pile cofferdam joints.

[0017] 5. Low molecular liquid bisphenol A epoxy resin has low viscosity and good fluidity. A large amount of filler (sawdust) can be added without using a diluent, maintaining high sealing performance at low cost.

[0018] 6. Sawdust material is easily available and costs almost nothing.

[0019] 7. When recycling steel sheet piles, pyrolysis treatment can generally be used. The adhesive at the locking position can be naturally detached after being heated, and the remaining slag can be completely removed after the steel sheet piles are cooled down and cleaned, which will not affect the reuse of the steel sheet piles. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below in conjunction with specific implementation methods.

[0021] A water-stopping material for the lock buckle of a deep-water single-walled steel sheet pile cofferdam is used to study how to more effectively seal and water-stop the lock buckle position of the single-walled steel sheet pile cofferdam when the river water is deep. The water-stopping material is made by fully stirring and mixing a specific type of epoxy resin and new sawdust in a suitable ratio. It is used for water-stopping of the lock buckle of a deep-water single-walled steel sheet pile cofferdam. The fluidity and water stability of the epoxy resin can be used to seal the lock buckle over a large area, and drive the sawdust to flow. Then, the sawdust absorbs water and expands. After entering the water, it can fully expand and seal the incompletely sealed position. This mixture is simple and quick to prepare, especially the sawdust material has almost no cost, which is suitable for large-scale application in the sealing process of the lock buckle of a deep-water single-walled steel sheet pile cofferdam in the construction industry.

[0022] Embodiment 1 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock buckle is obtained by fully stirring and mixing low-molecular liquid bisphenol A epoxy resin and new sawdust in a mass ratio of 8:2, thereby obtaining the water-stopping material. The low-molecular liquid bisphenol A epoxy resin is E-44, with an epoxy equivalent of 0.21-0.24 mol / 100g, purchased from Guangzhou Municipal Engineering Materials Supply Co., Ltd.; the sawdust is prepared from new wood on site, and the size of the sawdust particles is 0.1-0.5 mm.

[0023] Test conditions: temperature is 29℃, humidity is 69%, mixing time of the mixture is 10min, stirring speed is 30rpm, and curing time after application is 30min.

[0024] Test method: Prepare a steel sheet pile splicing water tank on site, assemble the single-wall steel sheet pile cofferdam when it is half filled with water. After assembly, there is water on one side and no water on the other side. Apply water-stopping material inside the lock buckle to check if there is any leakage, and re-coat and seal the leaking part in time. Calculate the leakage by measuring the daily water level change, and calculate the fluidity by measuring the flow length of the paint at the lock buckle position.

[0025] Comparative Example 1 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing low-molecular liquid bisphenol A epoxy resin and new sawdust in a mass ratio of 9:1. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0026] The unmentioned parts of this comparative example are the same as those of Example 1.

[0027] Comparative Example 2 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing low-molecular liquid bisphenol A epoxy resin and new sawdust in a mass ratio of 7:3. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0028] The unmentioned parts of this comparative example are the same as those of Example 1.

[0029] Comparative Example 3 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing low-molecular liquid bisphenol A epoxy resin and new sawdust in a mass ratio of 6:4. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0030] The unmentioned parts of this comparative example are the same as those of Example 1.

[0031] Comparative Example 4 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock buckle is prepared by fully stirring and mixing epoxidized olefin compound type epoxy resin and new sawdust in a mass ratio of 9:1. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0032] The unmentioned parts of this comparative example are the same as those of Example 1.

[0033] Comparative Example 5 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock buckle is prepared by fully stirring and mixing epoxidized olefin compound type epoxy resin and new sawdust in a mass ratio of 8:2. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0034] The unmentioned parts of this comparative example are the same as those of Example 1.

[0035] Comparative Example 6 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock buckle is prepared by fully stirring and mixing epoxidized olefin compound type epoxy resin and new sawdust in a mass ratio of 7:3. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0036] The unmentioned parts of this comparative example are the same as those of Example 1.

[0037] Comparative Example 7 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock buckle is prepared by fully stirring and mixing epoxidized olefin compound type epoxy resin and new sawdust in a mass ratio of 6:4. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0038] The unmentioned parts of this comparative example are the same as those of Example 1.

[0039] Comparative Example 8 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing polyphenol type glycidyl ether epoxy resin and new sawdust in a mass ratio of 9:1. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0040] The unmentioned parts of this comparative example are the same as those of Example 1.

[0041] Comparative Example 9 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing polyphenol type glycidyl ether epoxy resin and new sawdust in a mass ratio of 8:2. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0042] The unmentioned parts of this comparative example are the same as those of Example 1.

[0043] Comparative Example 10 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing polyphenol type glycidyl ether epoxy resin and new sawdust in a mass ratio of 7:3. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0044] The unmentioned parts of this comparative example are the same as those of Example 1.

[0045] Comparative Example 11 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing polyphenol type glycidyl ether epoxy resin and new sawdust in a mass ratio of 6:4. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0046] The unmentioned parts of this comparative example are the same as those of Example 1.

[0047] Comparative Example 12 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing polyphenol type glycidyl ether epoxy resin and new sawdust in a mass ratio of 9:1. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0048] The unmentioned parts of this comparative example are the same as those of Example 1.

[0049] Comparative Example 13 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing polyphenol type glycidyl ether epoxy resin and new sawdust in a mass ratio of 8:2. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0050] The unmentioned parts of this comparative example are the same as those of Example 1.

[0051] Comparative Example 14 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing polyphenol type glycidyl ether epoxy resin and new sawdust in a mass ratio of 7:3. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0052] The unmentioned parts of this comparative example are the same as those of Example 1.

[0053] Comparative Example 15 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing polyphenol type glycidyl ether epoxy resin and new sawdust in a mass ratio of 6:4. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0054] The unmentioned parts of this comparative example are the same as those of Example 1.

[0055] Comparative Example 16 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing heterocyclic and mixed epoxy resins with new sawdust in a mass ratio of 9:1. The sawdust particles have a size of 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0056] The unmentioned parts of this comparative example are the same as those of Example 1.

[0057] Comparative Example 17 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing heterocyclic and mixed epoxy resins with new sawdust in a mass ratio of 8:2. The sawdust particles have a size of 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0058] The unmentioned parts of this comparative example are the same as those of Example 1.

[0059] Comparative Example 18 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing heterocyclic and mixed epoxy resins with new sawdust in a mass ratio of 7:3. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0060] The unmentioned parts of this comparative example are the same as those of Example 1.

[0061] Comparative Example 19 A water-stopping material for a deepwater single-wall steel sheet pile cofferdam lock is prepared by fully stirring and mixing heterocyclic and mixed epoxy resins with new sawdust in a mass ratio of 6:4. The size of the sawdust particles is 0.1-0.5 mm. Thus, the water-stopping material is obtained.

[0062] The unmentioned parts of this comparative example are the same as those of Example 1.

[0063] Comparative Example 20 An existing steel sheet pile cofferdam lock glycidyl ester epoxy resin water-stop material was selected, with a grade of 21544-03-6 and an epoxy value of 0.57-0.67eq / 100g, purchased from Guangzhou Municipal Engineering Materials Supply Co., Ltd.

[0064] The deepwater single-wall steel sheet pile cofferdam assembly and sealing method are the same as those in Example 1, and the test instrument and detection steps are also the same as those in Example 1.

[0065] Comparative Example 21 An existing steel sheet pile cofferdam lock rubber water-stop material, model HTQ660, density 1.62g / cm³, purchased from Guangzhou Municipal Engineering Materials Supply Co., Ltd. The test instrument and testing steps are also the same as in Example 1.

[0066] For Example 1 and Comparative Examples 1 to 21, the same assembly conditions, the same test instruments, and the same test steps were used to test the leakage, fluidity, and anti-seepage effect. The test results are shown in the following table: According to the above results, we can know that: The new sawdust in the water-stopping material of the present invention is a material recycling because of the large amount of stock on the construction site, and the cost can be ignored. In each embodiment, there are mainly cost differences between different types of epoxy resins and rubber materials, but the difference is not large. However, under the premise that the cost difference is not large, the steel sheet pile cofferdam lock buckle water-stopping material of the present invention has the advantages of good flow performance, good water-stopping effect, good anti-seepage performance, easy removal after construction is completed, and low cost. Therefore, using this mixed water-stopping material for single-wall steel sheet pile cofferdam lock buckle water-stopping construction can obtain better economic benefits.

[0067] In large-scale bridge engineering projects, especially in the construction of deep-water single-wall steel sheet pile cofferdams, it is difficult to ensure the waterproofness of the cofferdam using traditional steel sheet pile cofferdam water-stopping materials. However, the sealant mixture made by fully stirring and mixing low-molecular liquid bisphenol A epoxy resin and new sawdust in a mass ratio of 8:1 has a leakage rate of only 0.264 (L / m·d), which can ensure the quality and effect of water-stopping at the joints after construction.

[0068] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the above embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be equivalent replacement methods and are included in the protection scope of the present invention.

Claims

1. A water-stopping material for locking buckles of deep-water single-wall steel sheet pile cofferdams, characterized in that: The water-stop material is made by fully mixing epoxy resin and sawdust, and is used in the lock joints of deep-water single-wall steel sheet pile cofferdams; the epoxy resin is a low-molecular liquid bisphenol A type epoxy resin; the mass ratio of epoxy resin to sawdust is 8:

2.

2. A water-stopping material for locking a deepwater single-wall steel sheet pile cofferdam according to claim 1, characterized in that: The sawdust is new sawdust.

3. A water-stopping material for locking a deepwater single-wall steel sheet pile cofferdam according to claim 2, characterized in that: The particle size of sawdust is 0.1-0.5 mm.

4. A water-stopping material for locking a deepwater single-wall steel sheet pile cofferdam according to claim 1, characterized in that: The sealing width at the locking joints of the single-wall steel sheet pile cofferdam is 0.4-0.6cm; the thickness is 1.0-1.2cm.

5. A water-stopping material for locking a deepwater single-wall steel sheet pile cofferdam according to claim 1, characterized in that: Before the cofferdam construction, the lock buckles of the steel sheet pile cofferdam are pre-treated to enhance the self-waterproofing ability of the lock buckle position and improve the purity of the water-stop material after application.

6. A water-stopping material for locking a deepwater single-wall steel sheet pile cofferdam according to claim 1, characterized in that: The fluidity of epoxy resin is used to drive the sawdust to move around various parts of the lock joints, and then the water absorption and expansion characteristics of sawdust are used to improve the caulking and water-stopping ability of the water-stopping material.

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