Self-waterproof steel sheet pile support structure based on water-swelling material and construction method thereof

Abstract

The present invention relates to the field of foundation construction technology, and in particular to a self-waterproof steel sheet pile support structure based on water-swelling material and a construction method thereof, wherein the steel sheet pile support structure comprises a main body plate, the main body plate comprises a bottom plate and side plates vertically fixed to both sides of the bottom plate, wherein two A-port card plates are fixed to the inner wall of one side plate, the two A-port card plates are parallel to each other and extend in the same direction as the side plate, and two B-port card plates are fixed to the inner wall of the other side plate, the two B-port card plates are parallel to each other and extend in the same direction as the side plate, the spacing between the two B-port card plates is greater than the spacing between the two A-port card plates, and water-swelling waterproof strips are fixed between the two A-port card plates and between the two B-port card plates. The steel sheet pile can effectively meet the two requirements of support and waterproofing of the foundation pit using a relatively small space, and is simple to construct. The sealing structure formed after the water-swelling waterproof strip expands can maintain a water-isolating effect for a long time, adapt to a variety of groundwater environments, and can solve the two problems of support and waterproofing at one time.

Description

Technical Field

[0001] The present invention relates to the field of foundation construction technology, and in particular to a self-waterproof steel sheet pile supporting structure based on water-absorbing and expanding materials and a construction method thereof. Background Art

[0002] With the continuous advancement of global urbanization, the rapid growth of urban population and the limited land resources have led to the high density of urban space. Especially in large cities, land has gradually become a scarce resource, which has prompted architectural design and construction to develop in the direction of high density and high level. In this process, the volume of buildings is getting larger and larger, and the building groups are becoming more and more compact, which has brought great challenges to the construction technology and construction environment.

[0003] At present, with the acceleration of urbanization, the available space of construction sites is becoming increasingly narrow. The application of traditional construction methods and equipment in these limited spaces faces many problems. The activity space of construction workers is limited, and the layout and operation of mechanical equipment are difficult, which not only affects the construction efficiency, but also may increase the construction risk. At the same time, the urbanization level in the eastern coastal areas is relatively high, and the groundwater level is relatively high, which puts forward more stringent standards for waterproofing in foundation pit construction. The foundation pits of many small and medium-sized projects cannot be smoothly carried out due to inadequate waterproofing measures or insufficient space for waterproofing facilities.

[0004] At present, the main waterproofing methods used at home and abroad to ensure that the structure is not damaged by moisture and avoid leakage problems include: laying waterproof membranes (such as SBS, APP, PVC, etc.), applying one or more layers of waterproof coatings (such as polyurethane waterproof coatings, epoxy resin waterproof coatings, etc.), waterproof concrete method, expansive cement waterproofing method, grouting waterproofing method, geotextile waterproofing method, etc.

[0005] However, if these methods are to achieve the purpose of preventing water seepage during the construction phase, most of them require a base surface for implementation, and ordinary steel sheet piles cannot meet this requirement. They can only rely on the stability of steel sheet piles to first build a base surface inside and then carry out waterproofing construction, which takes up a lot of construction site and internal space. Summary of the invention

[0006] In order to solve the above problems existing in the prior art, the present invention provides a self-waterproof steel sheet pile supporting structure based on water-absorbing and swelling materials and a construction method thereof.

[0007] In a first aspect, the present invention provides a self-waterproof steel sheet pile support structure based on water-swelling material, which adopts the following technical solution: A self-waterproof steel sheet pile supporting structure based on water-swelling material comprises a main body plate, the main body plate comprises a bottom plate and side plates vertically fixed to both sides of the bottom plate, wherein two A-port clamps are fixed to the inner wall of one side plate, the two A-port clamps are parallel to each other and extend in the same direction as the side plate, and two B-port clamps are fixed to the inner wall of the other side plate, the two B-port clamps are parallel to each other and extend in the same direction as the side plate, the spacing between the two B-port clamps is greater than the spacing between the two A-port clamps, and water-swelling waterproof strips are fixed between the two A-port clamps and between the two B-port clamps.

[0008] By adopting the above technical scheme, the self-waterproof steel sheet pile support structure based on water-swelling materials occupies a small space, and can effectively meet the two requirements of support and waterproofing of the foundation pit using a smaller space, and is simple to construct. The design of the card plate allows the AB two ends to be easily matched, without the need for complicated tools or difficult operations, and the construction is convenient; the sealing structure formed after the water-swelling waterproof strip expands can maintain the water-isolating effect for a long time and adapt to a variety of groundwater environments; it can effectively reduce the impact of groundwater on construction, especially in high water level areas where the construction space is very limited and it is impossible to dig precipitation wells in the surrounding area, and can solve the two problems of support and waterproofing at one time.

[0009] Optionally, an A-port guard plate is fixedly connected between the ends of the two A-port card plates, and a B-port guard plate is fixedly connected between the ends of the two B-port card plates, and the A-port guard plate and the B-port guard plate have the same size.

[0010] By adopting the above technical solution, the guard plate is used to prevent the water-swelling waterproof strip from being damaged during the process of inserting the steel sheet pile into the ground.

[0011] Optionally, the bottom plate is in a "X" shape, and a groove for accommodation is formed between the bottom plate and the side plate.

[0012] Optionally, the water-swellable waterproof strip is a polyurethane waterproof strip.

[0013] In a second aspect, the present invention provides a construction method of a self-waterproof steel sheet pile supporting structure based on a water-swellable material, comprising the following steps: S1. Pile position setting, specifically including: setting out the position and construction line of the steel sheet pile according to the construction drawings to ensure the accuracy of the pile position; S2. Preparation of pile driver, including: selection of pile driving equipment suitable for the on-site construction environment; S3. Check the steel sheet piles, including: check whether the appearance of the steel sheet piles is intact, whether there is a large deformation, whether it is deformed due to moisture, and replace new water-absorbing and swelling waterproof strips in time; S4, splicing lock mouth, specifically including: A mouth and B mouth are arranged opposite to each other and directly spliced; S5. Pile driving operation, specifically including: using a pile driver to drive the steel sheet pile into the soil; S6, water injection expansion, specifically including: performing water injection treatment at the water injection port; S7. Stability and waterproof inspection, including: Check whether the water-swelling waterproof strip is completely sealed to ensure that there is no water seepage or soil leakage.

[0014] Optionally, during the S5 piling process, it is necessary to first drive a small amount vertically, and then gradually drive the steel sheet piles to the designed depth, and use static pressure to drive the steel sheet piles in. During the piling process, the steel sheet piles are gradually connected one by one to ensure that the splicing between each steel sheet pile is correct and tight to ensure waterproofness.

[0015] In summary, the present invention includes at least one of the following beneficial technical effects: The self-waterproof steel sheet pile support structure based on water-swelling materials occupies a small space, and can effectively meet the two requirements of foundation pit support and waterproofing in a small space. It is also simple to construct. The design of the card plate allows the AB two ends to fit together easily, without the need for complex tools or difficult operations, and the construction is convenient. The sealing structure formed by the expansion of the water-absorbing and swelling waterproof strip can maintain the waterproof effect for a long time and adapt to various groundwater environments; It can effectively reduce the impact of groundwater on construction, especially in high water level areas where construction space is very limited and it is impossible to dig precipitation wells in the surrounding area. It can solve the two problems of support and waterproofing at one time. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a monomer schematic diagram of a self-waterproof steel sheet pile supporting structure based on water-swellable material according to an embodiment of the present invention.

[0017] Figure 2 It is a combined schematic diagram of a self-waterproof steel sheet pile supporting structure based on water-swellable material according to an embodiment of the present invention.

[0018] Figure 3 It is a flow chart of a construction method of a self-waterproof steel sheet pile supporting structure based on water-swelling material according to an embodiment of the present invention.

[0019] Explanation of the reference numerals: 1. Main body panel; 10. Bottom panel; 11. Side panel; 2. A-port bracket; 3. B-port bracket; 4. Water-swelling waterproof strip; 5. A-port guard plate; 6. B-port guard plate; 7. Water inlet. DETAILED DESCRIPTION

[0020] The following is combined with Figure 1 -Attached Figure 3 The present invention is described in further detail.

[0021] The embodiment of the present invention discloses a self-waterproof steel sheet pile support structure based on water-swelling material. Figure 1 and Figure 2The self-waterproof steel sheet pile supporting structure based on water-swelling material includes a main body plate 1, which includes a bottom plate 10 in a "J" shape and side plates 11 vertically fixed to both sides of the bottom plate 10, and a groove for accommodating is formed between the side plates 11 and the middle of the bottom plate 10.

[0022] Reference Figure 1 and Figure 2 , two A-port card plates 2 are vertically fixedly connected to the side wall of one side plate 11 close to the bottom plate 10, the length direction of the A-port card plates 2 is the same as the length direction of the side plate 11, and a gap of 30 mm is formed between the two A-port card plates 2. Two B-port card plates 3 are vertically fixedly connected to the side wall of the other side plate 11 close to the bottom plate 10, the length direction of the B-port card plates 3 is the same as the length direction of the side plate 11, and a gap of 40 mm is formed between the two B-port card plates 3. The thickness of the A-port card plates 2 and the B-port card plates 3 are both 4 mm.

[0023] Reference Figure 1 and Figure 2 A water-swelling waterproof strip 4 is provided between the two A-port pallets 2 and between the two B-port pallets 3. The water-swelling waterproof strip 4 is bonded and fixed to the inner wall of the side plate 11. The water-swelling waterproof strip 4 in this embodiment is a polyurethane waterproof strip. Two A-port guard plates 5 are provided between the two A-port pallets 2. The A-port guard plates 5 are located at the ends of the water-swelling waterproof strip 4 and between the two A-port pallets 2. The width of the A-port guard plates 5 is smaller than the width of the A-port pallets 2. The A-port guard plates 5 are vertically fixed to the inner wall of the side plate 11.

[0024] Reference Figure 1 and Figure 2 , two B-port guard plates 6 are arranged between the two B-port card plates 3, the B-port guard plates 6 are located at the ends of the water-swelling waterproof strips 4 and between the two B-port card plates 3, the B-port guard plates 6 are the same size as the A-port guard plates 5, a gap is arranged between the B-port guard plates 6 and the B-port card plates 3, and the B-port guard plates 6 are vertically fixed to the inner wall of the side plate 11. The A-port guard plates 5 and the B-port guard plates 6 are used to prevent the water-swelling waterproof strips 4 from being damaged during the insertion of the steel sheet piles into the ground. The two steel sheet piles are reversely buckled, and the two A-port card plates 2 of one steel sheet pile are inserted between the two B-port card plates 3 of the other steel sheet pile, so that a water injection port 7 is formed between the corresponding A-port guard plates 5 and the B-port guard plates 6.

[0025] Reference Figure 1-Figure 3 The construction method of the self-waterproof steel sheet pile supporting structure based on water-swellable material according to the embodiment of the present invention comprises the following steps: S1. Pile position layout, specifically including: laying out the position and construction line of steel sheet piles according to the construction drawings to ensure the accuracy of pile position.

[0026] S2. Preparation of pile driver, including: selection of suitable pile driving equipment, commonly used equipment include crawler pile drivers, hydraulic pile drivers, etc.

[0027] S3. Check the steel sheet piles, including: check whether the appearance of the steel sheet piles is intact and whether there is any significant deformation, and pay special attention to whether the water-absorbing and swelling waterproof strip 4 has expanded due to moisture and other factors. If it exceeds the A-port guard plate 5 or the B-port guard plate 6, replace the new water-absorbing and swelling waterproof strip 4 in time.

[0028] S4, splicing locks, specifically including: the steel sheet piles of the present invention are different from conventional steel sheet piles in that they are connected by hook-shaped locks, but are directly spliced. When splicing, it is necessary to ensure that the lock positions are correct, and the directions of ports A and B are correct, to ensure the correct closure of the subsequent water-absorbing and swelling waterproof strip 4 and the strength of the connection structure.

[0029] S5. Piling operation, specifically including: using a pile driver to drive steel sheet piles into the soil. During the piling process, it is usually necessary to first drive a small number of piles vertically, and then gradually drive the steel sheet piles to the designed depth. The steel sheet piles are driven in by static pressure. During the piling process, the steel sheet piles are gradually connected one by one to ensure that the joints between each steel sheet pile are correct and tight to ensure waterproofness.

[0030] S6, water injection and expansion, specifically including: injecting water into the water injection ports 7 at all steel sheet pile connections, the water injection height should overflow the water injection ports 7 to enhance the overall sealing, and waiting for 12 hours to observe whether the water absorption and expansion waterproof strips 4 on both sides of AB are closed.

[0031] S7. Stability and waterproof inspection, specifically including: checking whether the water-swelling waterproof strip 4 is completely sealed to ensure that there is no water seepage or soil leakage.

[0032] Through simple plugging, port A and port B form a water injection port 7 with a semi-enclosed space of about 20 mm. At this time, the construction personnel inject water into the water injection port 7, and the water can flow in through the port and gradually overflow, or let the groundwater naturally infiltrate the water-absorbing and swelling waterproof strip 4. The water absorption and swelling speed of the water-absorbing and swelling waterproof strip 4 can be controlled according to the design requirements. In this process, the water-absorbing and swelling waterproof strip 4 made of polyurethane material will absorb water and swell, and the degree of expansion can reach 3 times its original volume.

[0033] As the water-swelling waterproof strip 4 expands, the space of the water injection port 7 will be completely filled, and the water-swelling waterproof strip 4 will produce a sealing effect with the surrounding environment, achieving a good waterproofing effect. After the construction of the steel sheet piles is completed, the construction party can adopt measures such as vacuum pumping to carry out precipitation measures inside the foundation pit, thereby effectively lowering the groundwater level and ensuring a dry and stable construction environment.

[0034] The self-waterproof steel sheet pile support structure based on the water-swelling material of the present invention occupies a small space, and can effectively meet the two requirements of foundation pit support and waterproofing using a relatively small space. It is also simple to construct, and the design of the card plate allows the two mouths AB to fit easily, without the need for complex tools or difficult operations, and the construction is convenient. The sealing structure formed after the water-swelling waterproof strip 4 expands can maintain a water-proof effect for a long time and adapt to a variety of groundwater environments. It can effectively reduce the impact of groundwater on construction, especially in high-water areas where the construction space is very limited and it is impossible to dig precipitation wells in the surrounding area, and can solve the two problems of support and waterproofing at one time.

[0035] The above are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A self-waterproof steel sheet pile support structure based on water-swelling material, characterized in that: The invention comprises a main body plate (1), the main body plate (1) comprising a bottom plate (10) and side plates (11) vertically fixed to both sides of the bottom plate (10), two A-port card plates (2) are fixedly connected to the inner wall of one of the side plates (11), the two A-port card plates (2) are parallel to each other and extend in the same direction as the side plate (11), two B-port card plates (3) are fixedly connected to the inner wall of the other side plate (11), the two B-port card plates (3) are parallel to each other and extend in the same direction as the side plate (11), the spacing between the two B-port card plates (3) is greater than the spacing between the two A-port card plates (2), and water-absorbing and swelling waterproof strips (4) are fixedly connected between the two A-port card plates (2) and between the two B-port card plates (3).

2. The self-waterproof steel sheet pile supporting structure based on water-swellable material according to claim 1 is characterized in that: An A-port guard plate (5) is fixedly connected between the ends of the two A-port clamping plates (2), and a B-port guard plate (6) is fixedly connected between the ends of the two B-port clamping plates (3). The A-port guard plate (5) and the B-port guard plate (6) have the same size.

3. The self-waterproof steel sheet pile supporting structure based on water-swellable material according to claim 1 is characterized in that: The bottom plate (10) is in a "J" shape, and a groove for accommodation is formed between the bottom plate (10) and the side plate (11).

4. The self-waterproof steel sheet pile supporting structure based on water-swellable material according to claim 1 is characterized in that: The water-absorbing and swelling waterproof strip (4) is a polyurethane waterproof strip.

5. A construction method for a self-waterproof steel sheet pile supporting structure based on a water-swellable material as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: S1. Pile position setting, specifically including: setting out the position and construction line of the steel sheet pile according to the construction drawings to ensure the accuracy of the pile position; S2. Preparation of pile driver, including: selection of pile driving equipment suitable for the on-site construction environment; S3. Check the steel sheet piles, including: check whether the steel sheet piles are intact in appearance, whether they have undergone significant deformation, and whether they have deformed due to moisture, and replace the water-absorbing and swelling waterproof strips with new ones in a timely manner (4); S4, splicing lock mouth, specifically including: A mouth and B mouth are arranged opposite to each other and directly spliced; S5. Piling operation, specifically including: using a pile driver to drive steel sheet piles into the soil; S6, water injection expansion, specifically comprising: performing water injection treatment at the water injection port (7); S7. Stability and waterproofness inspection, specifically including: checking whether the water-swelling waterproof strip (4) is completely sealed to ensure that there is no water seepage or soil leakage.

6. The construction method of the self-waterproof steel sheet pile supporting structure based on water-swellable material according to claim 5 is characterized in that: During the S5 piling process, a small amount of steel sheet piles need to be driven vertically first, and then the steel sheet piles are gradually driven to the designed depth. The steel sheet piles are driven in by static pressure. During the piling process, the steel sheet piles are gradually connected one by one to ensure that the joints between each steel sheet pile are correct and tight to ensure waterproofness.

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