Island building multi-stage excavation type water slide construction method and slide

Abstract

The application relates to the technical field of water slide construction, and provides an island-building multi-stage excavation type water slide construction method and a water slide, which comprises the following steps: island building in a water slide area; slide pile foundation and water stop dewatering reinforcement construction; first-stage dewatering excavation and slide construction; second-stage dewatering excavation and slide construction; third-stage dewatering excavation and slide construction; steel sheet pile pulling out and island dismantling. The whole plate structure is formed by constructing the water stop steel sheet pile on the periphery of the island building platform and grouting and constructing the water stop counterpressure layer at the lower part of the island building platform, the problems of high leakage risk and large permeability coefficient near the river are solved, the problems of dewatering difficulty in the excavation process and the risk of water gushing are avoided; through the multi-stage excavation method, a construction operation surface is quickly provided for the slide structure, the prefabricated construction of the slide structure is changed into cast-in-situ construction, the construction difficulty is reduced, the construction period is shortened, and the construction safety risk is effectively reduced.

Description

Technical Field

[0001] This invention belongs to the field of water slide technology, specifically relating to a construction method and slide for a multi-stage excavation type water slide built on an island. Background Technology

[0002] A slipway is a ramp in shipyards and repair shops that connects the slipway to the water area for launching and loading ships. The underwater section is called the underwater slipway. Currently, most slipway projects in water areas utilize underwater hoisting of precast lattice beams. This method requires divers to explore underwater and coordinate with large hoisting equipment for positioning the lattice beams. Construction quality is heavily influenced by human factors, installation accuracy is difficult to control, and the operation is time-consuming and risky. Although automated visual installation equipment for slipway lattice beams has been developed, achieving equipment integration, automated operation, and underwater visualization, it still faces high costs, long construction periods, and significant construction difficulties and risks. A small number of projects use direct cofferdams. Cofferdam construction has a long period, high closure requirements, and a long service life. Structural leakage often leads to significant safety risks in pile foundation construction and subsequent construction, resulting in high overall construction costs. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a method and method for constructing a multi-stage excavation-type water slide by building an island. By creating a dry working environment through island construction, the water slide is transformed into a dry environment for in-situ casting. By combining water-stopping reinforcement, staged excavation and in-situ casting, this method solves the problems of low accuracy and high cost of underwater hoisting of precast grid beams and high risk of leakage during cofferdam construction in traditional water slide construction methods.

[0004] To achieve the above objectives, the present invention provides the following technical solution: In a first aspect, the present invention proposes a construction method for a multi-stage excavation-type water slide for island construction, comprising the following steps: Step 1: Construct an island in the water slide area to form an island platform; construct a hardened road around the island platform, and reserve a first construction road at the junction of the water slide area and the land slide area. Step 2, Pile Foundation and Waterstop Reinforcement: Construct pile foundations from the riverside of the water slide area towards the land slide area; arrange waterstop steel sheet piles around the perimeter of the island platform; reinforce the waterstop counterpressure layer at the bottom of the island platform using high-pressure jet grouting to form an integral slab structure; construct dewatering wells inside the island platform; Step 3: Excavate the first stage of soil below the first construction road in the water slide area to excavate the construction working surface of the first section of the water slide structure and construct the first section of the slide structure. Step 4: Set up a second construction road below the first slide structure, and excavate the second stage of soil below the second construction road to excavate the construction working face of the second section of the water slide structure, and construct the second section of the slide structure. Step 5: Excavate the third stage of soil in the area of ​​the first construction road and the second construction road, and construct the third section of the slide structure; Step 6: Pull out the water-stopping steel sheet piles and clean the island construction platform.

[0005] Furthermore, in step 3, a temporary drainage ditch is constructed on the construction work surface of the first section of the slide structure and above the pre-constructed second construction road.

[0006] Furthermore, in step 5, the third-stage soil excavation adopts a backward excavation from the center to both sides, and the construction of the third-section slide structure is carried out simultaneously.

[0007] Furthermore, the water slide structure is constructed using a cast-in-place process.

[0008] Furthermore, the first and second slide sections are both three-slide structures, and the third slide section is either a three-slide structure or a two-slide structure.

[0009] Furthermore, during the excavation of the first and second stages of soil, the foundation pit support slope formed within the island construction platform is simultaneously supported by shotcrete and anchor.

[0010] Furthermore, a temporary drainage ditch is constructed at the bottom of the foundation pit support slope.

[0011] Furthermore, in step 1, the island-building platform is constructed by expanding and filling with clay.

[0012] Furthermore, geotextile fabric is laid on the water-facing slope of the island-building platform, and ton bags are stacked in layers; each layer of ton bags is connected and tied together with hemp rope to form a whole.

[0013] Secondly, the present invention proposes a slide, comprising a land slide and a water slide connected together, wherein the water slide is constructed using the method described above.

[0014] The beneficial effects of this invention are as follows: This invention uses clay with a low permeability coefficient to expand and fill the island platform, quickly forming a platform that facilitates pile foundation construction. By constructing water-stopping steel sheet piles around the island platform and grouting the lower part of the island platform to reinforce the water-stopping counterpressure layer, an integral slab structure is formed, solving the problems of high leakage risk and high permeability coefficient near the river, and avoiding the problems of difficult dewatering and water inrush risk during the excavation process. Through a multi-stage excavation method, a construction working surface is quickly provided for the slide structure, transforming the prefabrication construction of the slide structure into cast-in-place construction, reducing construction difficulty and shortening the construction period, and effectively reducing construction safety risks. Attached Figure Description

[0015] Figure 1 This is a flowchart of the construction method of the present invention.

[0016] Figure 2 This is a cross-sectional schematic diagram of the island-building platform in step 1 of the construction method of the present invention.

[0017] Figure 3 This is a schematic cross-sectional view of the pile foundation and water-stopping reinforcement after step 2 of the construction method of the present invention.

[0018] Figure 4 for Figure 3 A top-view structural diagram.

[0019] Figure 5 This is a cross-sectional view of the first section of the slide structure after construction in step 3 of the construction method of the present invention.

[0020] Figure 6 for Figure 5 A top-view structural diagram.

[0021] Figure 7 This is a cross-sectional view of the second section of the slide structure after construction in step 4 of the construction method of the present invention.

[0022] Figure 8 for Figure 7 A top-view structural diagram.

[0023] Figure 9 This is a cross-sectional view of the third section of the slide structure after construction in step 5 of the construction method of the present invention.

[0024] Figure 10 for Figure 9 A top-view structural diagram.

[0025] In the diagram: 1-Land slide area; 2-First construction road; 2.1-Second construction road; 3-Original ground line; 4-Excavation bottom line; 5-Island platform; 6-Hardened road; 7-Foundation pit support slope; 8-Pile foundation; 9-Dewatering well; 10-Water-stopping steel sheet pile; 11-Reinforced water-stopping counterpressure layer; 12-Water slide structure; 12.1-First slide structure; 12.2-Second slide structure; 12.3-Third slide structure; 13-Temporary drainage ditch. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0027] like Figure 1 The construction method for a multi-stage excavation-type water slide, as shown, includes the following steps: Step 1: Construct islands in the water slide area like Figure 2 As shown, an island platform 5 is constructed in the water slide area, forming the water slide construction area. A 20cm thick temporary hardened concrete road 6 is constructed around the island platform 5 as a machinery access road. A first construction road 2 is reserved at the boundary between the water slide area and the land slide area 1; in this embodiment, the reserved width of the first construction road 2 is 6m. The island platform 5 is constructed using clay with a low permeability coefficient, extending outwards. The filling area extends 20-30m outwards from the water slide area, and the island platform 5 forms a support cofferdam structure after multi-stage excavation. Geotextile is laid on the water-facing slope of the island platform 5, and ton bags are stacked in layers; each layer of ton bags is connected and tied together with hemp rope to form a whole. The height of the island platform 5 is 0.5m higher than the highest water level.

[0028] Step 2: Construction of Slide Track Pile Foundation 8 and Water-stopping and Dewatering Reinforcement like Figure 3 , Figure 4 As shown, the construction pile foundation 8 is advanced from the riverside of the water slide area to the land slide area 1; Water-stop sheet piles 10 are arranged along the perimeter of the island-building platform 5. The water-stop sheet piles 10 are inserted using the rotary drilling method. In this example, 800mm diameter boreholes are used as the pilot holes for the water-stop sheet piles 10, with a 250mm interlocking diameter between the boreholes. Guide frames are installed during the construction of the water-stop sheet piles 10 to ensure the interlocking effect between them and guarantee their water-stopping effect.

[0029] High-pressure jet grouting is used to reinforce the water-stopping counterpressure layer 11 at the bottom of the island platform 5. In this embodiment, jet grouting is carried out in the area 2-3m below the excavation bottom line 4 to form an integral slab structure.

[0030] After the reinforcement and water-stopping counterpressure layer 11 is completed, a dewatering well 9 is constructed inside the island platform 5; the depth of the dewatering well 9 is 50cm above the reinforcement and water-stopping counterpressure layer 11.

[0031] Step 3: First-stage dewatering excavation and slide construction like Figure 5 , Figure 6 As shown, the first stage of soil excavation is carried out below the first construction road 2 in the water slide area, excavating the working surface of the first section of the water slide structure 12, 12.1, and constructing the first section of the slide structure 12.1; on the working surface of the first section of the slide structure 12.1, and above the pre-constructed second construction road 2.1, a temporary drainage ditch 13 is constructed. Water is dewatered to 50cm below the excavation surface through the combination of the temporary drainage ditch 13 and dewatering wells 9, and excavation is carried out in layers; excavation reaches the bottom of the three slide structures below the first construction road 2; wherein the first section of the slide structure 12.1 is a three-slide structure. The temporary drainage ditch 13 is located at the bottom of the first section of the slide structure 12.1. The excavated foundation pit support slope 7 is simultaneously reinforced with shotcrete and anchor during excavation to ensure the stability of the foundation pit. After excavation reaches the bottom of the first section of the slide structure 12.1, the first section of the slide structure 12.1 will be constructed using the cast-in-place method, including pile head treatment, rebar tying, formwork erection and concrete construction. Existing technology can be used for the cast-in-place construction of the slide structure.

[0032] Step 4: Second-stage dewatering excavation and slide construction like Figure 7 , Figure 8 As shown, a second construction road 2.1 is set below the first slide structure. The second construction road 2.1 serves as the access channel for equipment and materials during the second-stage soil excavation and the construction of the second slide structure 12.2. The second-stage soil excavation is carried out below the second construction road 2.1, excavating the working surface of the second slide structure 12.2 of the water slide structure 12, and then constructing the second slide structure 12.2. A temporary drainage ditch 13 is also set at the bottom of the second slide structure 12.2. This temporary drainage ditch 13 is located at the bottom of the foundation pit support slope 7 after the second-stage soil excavation is completed. During the second-stage soil excavation, the water level is lowered to 50cm below the excavation bottom line 4 through the temporary drainage ditch 13 until the working surface of the second slide structure 12.2 is excavated. The second slide structure 12.2 is also a three-slide structure, belonging to the lowest three-slide structure of the water slide structure 12.

[0033] Step 5: Third-stage dewatering excavation and slide construction like Figure 9 , Figure 10As shown, the third stage of soil excavation is carried out in the area of ​​the first construction road 2 and the second construction road 2.1, and the third section of the slide structure 12.3 is constructed. The third stage of soil excavation adopts a retreating excavation from the center to both sides, and the construction of the third section of the slide structure 12.3 is carried out simultaneously. The third section of the slide structure 12.3 located in the area of ​​the first construction road 2 is a two-slide structure, connecting the first section of the slide structure 12.1 and the land slide structure; the third section of the slide structure 12.3 located in the area of ​​the second construction road 2.1 is a three-slide structure, connecting the first section of the slide structure 12.1 and the second section of the slide structure 12.2.

[0034] Step 6: Sheet pile extraction and island demolition The water-stopping steel sheet piles 10 were pulled out from the downstream and the island-building platform 5 was cleaned. The underwater parts of the island-building platform 5 that could not be cleaned were cleaned together with the subsequent dredging.

[0035] Based on the same inventive concept, this invention proposes a slide, comprising a land slide and a water slide connected together, wherein the water slide is constructed using the method described above. The water slide includes a third slide structure 12.3, a first slide structure 12.1, a third slide structure 12.3, and a second slide structure 12.2 connected sequentially from top to bottom.

[0036] This invention has the following innovative features: 1. Combination of island construction and multi-stage excavation: By expanding the island to form a support cofferdam, and excavating in stages to create dry construction conditions, the leakage problem of traditional cofferdams can be solved.

[0037] 2. Water-stopping reinforcement system: steel sheet piles + bottom jet grouting + dewatering wells 9, to construct a three-dimensional water-stopping structure to resist high water pressure and reduce the permeability coefficient.

[0038] 3. Interleaved construction process: The slide structure is constructed simultaneously with each stage of excavation, and the construction road is used to optimize material transportation and shorten the cycle.

[0039] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A construction method for a multi-stage excavation-type water slide for island construction, characterized in that, Includes the following steps: Step 1: Construct an island in the water slide area to form an island platform; construct a hardened road around the island platform, and reserve a first construction road at the junction of the water slide area and the land slide area. Step 2, Pile Foundation and Waterstop Reinforcement: Construct pile foundations from the riverside of the water slide area towards the land slide area; arrange waterstop steel sheet piles around the perimeter of the island platform; reinforce the waterstop counterpressure layer at the bottom of the island platform using high-pressure jet grouting to form an integral slab structure; construct dewatering wells inside the island platform; Step 3: Excavate the first stage of soil below the first construction road in the water slide area to excavate the construction working surface of the first section of the water slide structure, and construct the first section of the slide structure; the water slide structure is constructed using the cast-in-place process. Step 4: Set up a second construction road below the first section of the slide structure, and excavate the second stage of soil below the second construction road to excavate the construction working surface of the second section of the water slide structure, and construct the second section of the slide structure. Step 5: Excavate the third stage of soil in the area of ​​the first construction road and the second construction road, and construct the third section of the slide structure; Step 6: Pull out the water-stopping steel sheet piles and clean the island construction platform.

2. The construction method for a multi-stage excavation-type water slideway for island construction according to claim 1, characterized in that, In step 3, a temporary drainage ditch is constructed on the construction work surface of the first section of the slide structure and above the pre-constructed second construction road.

3. The construction method for a multi-stage excavation-type water slideway for island construction according to claim 1, characterized in that, In step 5, the third-stage soil excavation adopts a backward excavation from the center to both sides, and the construction of the third-section slide structure is carried out simultaneously.

4. The construction method for a multi-stage excavation-type water slide for island construction according to claim 1, characterized in that, The first and second slide sections are both three-slide structures, while the third slide section is either a three-slide structure or a two-slide structure.

5. The construction method for a multi-stage excavation-type water slideway for island construction according to claim 1, characterized in that, During the excavation of the first and second stages of soil, the foundation pit support slope formed within the island construction platform is simultaneously supported by shotcrete and anchor.

6. The construction method for a multi-stage excavation-type water slideway for island construction according to claim 5, characterized in that, A temporary drainage ditch was constructed at the bottom of the foundation pit support slope.

7. The construction method for a multi-stage excavation-type water slideway for island construction according to claim 1, characterized in that, In step 1, the island-building platform is constructed by expanding and filling with clay.

8. The construction method for a multi-stage excavation-type water slide for island construction according to claim 1, characterized in that, Geotextile fabric is laid on the water-facing slope of the island-building platform, and ton bags are stacked in layers; each layer of ton bags is connected and tied together with hemp rope to form a whole.

9. A type of slide, characterized in that, It includes connected land slides and water slides, wherein the water slides are constructed using the method described in claim 1.

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