Island building multi-step excavation type water area slide way construction method and slide way

Abstract

The invention relates to the technical field of water area slide ways, and provides an island building multi-step excavation type water area slide way construction method and a slide way. Carrying out slide pile foundation and water stop dewatering reinforcement construction; first-order precipitation excavation and slide way construction; second-order precipitation excavation and slide way construction are carried out; third-order precipitation excavation and slide way construction are carried out; pulling out the steel sheet piles and removing the constructed island. The waterstop steel sheet piles are constructed on the periphery of the island building platform, the waterstop back pressure reinforcing layer is constructed on the lower portion of the island building platform in a grouting mode, an integral plate body structure is formed, the problems of high leakage risk near the river and large permeability coefficient are solved, and the problem of difficult precipitation in the excavation process and the risk of water burst are avoided; through a multi-step excavation method, a construction working face is rapidly provided for the slideway structure, prefabricated construction of the slideway structure is converted into cast-in-place construction, the construction difficulty is reduced, the construction period is shortened, and the construction safety risk is effectively reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of water slides, and in particular relates to a construction method for an island-building multi-step excavation type water slide and a slide. Background Art

[0002] A slipway is a ramp connecting the slipway and the waterway in shipyards and shipbuilding yards, allowing ships to embark and disembark. The portion that extends underwater is the underwater slipway. Currently, the vast majority of slipway projects in water areas utilize underwater hoisting of prefabricated slatted beams. This method requires divers to explore underwater and adjust the position of the slatted beams with the aid of large-scale hoisting equipment. Construction quality is significantly affected by human factors, installation accuracy is difficult to control, and the operation time and risk are long. Although automated and visual installation equipment for slatted beams has been developed, achieving equipment integration, automated operation, and underwater visualization, it still poses high investment costs, a long construction period, and significant construction difficulty and risk. A small number of projects utilize direct cofferdams, which have a long construction period and demanding closure requirements. The cofferdams also have a long service life, and structural leakage often leads to significant safety risks during pile foundation construction and subsequent construction, resulting in high overall construction costs. Summary of the Invention

[0003] In response to the shortcomings of the existing technology, the present invention provides an island-building multi-stage excavation water slide construction method and slide. By building an island to form a dry working environment, the water slide is converted to a dry environment cast-in-place. Combined with water-stop reinforcement, staged excavation and cast-in-place construction, the problems of low precision and high cost of underwater lifting of prefabricated cross-beams in traditional water slide construction methods and high risk of leakage in cofferdam construction are solved.

[0004] To achieve the above object, the present invention provides the following technical solutions: In a first aspect, the present invention provides a method for constructing a multi-stage excavation water slide, comprising the following steps: Step 1: construct an island in the water slide area to form an island platform; construct a hardened road outside 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 water-stop reinforcement: Advance the construction of pile foundation from the riverside of the water slide area to the land slide area; arrange water-stop steel sheet piles along the periphery of the island platform; use high-pressure rotary grouting to reinforce the water-stop back pressure layer at the bottom of the island platform to form an integral plate structure; construct a drainage well inside the island platform; Step 3: excavate the first stage of soil below the first construction road in the water slide area to form a construction working surface for the first section of the water slide structure, and construct the first section of the slide structure; Step 4: setting up a second construction road below the first slide structure, excavating a second step of soil below the second construction road to form a construction working surface for the second section of the water slide structure, and constructing the second section of the slide structure; Step 5: excavating the third stage of soil in the area of ​​the first construction road and the second construction road, and constructing the third section of the slideway structure; Step 6: Pull out the water-stop steel sheet piles and clean the island-building platform.

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

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

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

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

[0009] Furthermore, during the excavation of the first stage soil mass and the second stage soil mass, the foundation pit support slope formed in the island building platform is supported by spray anchors synchronously with the excavation.

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

[0011] Furthermore, in step 1, the island building platform is filled with clay.

[0012] Furthermore, the waterside slope of the island-building platform is paved with geotextiles, and ton bags are stacked in layers; each layer of ton bags is tied in series with hemp ropes to form a whole.

[0013] In a second aspect, the present invention provides a slide comprising a land slide and a water slide connected to each other, wherein the water slide is constructed using the above-mentioned method.

[0014] The beneficial effects of the present invention are as follows: the present invention adopts clay with a small permeability coefficient to expand and fill the island-building platform, quickly forming a platform that is convenient for pile foundation construction, and by constructing water-stop steel sheet piles on the periphery of the island-building platform and grouting the lower part of the island-building platform to reinforce the water-stop back pressure layer, an integral plate structure is formed, which solves the problems of high leakage risk near the river and large permeability coefficient, and avoids the problem of difficult precipitation and the risk of water gushing during the excavation process; through the multi-stage excavation method, a construction working surface is quickly provided for the slide structure, and the prefabricated construction of the slide structure is converted into cast-in-place construction, which reduces the construction difficulty and shortens the construction period, and effectively reduces the construction safety risk. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 Flowchart of the construction method of the present invention.

[0016] Figure 2 It 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 It is a cross-sectional schematic diagram after the pile foundation and water-stop reinforcement construction in step 2 of the construction method of the present invention.

[0018] Figure 4 for Figure 3 Schematic diagram of the top view structure.

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

[0020] Figure 6 for Figure 5 Schematic diagram of the top view structure.

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

[0022] Figure 8 for Figure 7 Schematic diagram of the top view structure.

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

[0024] Figure 10 for Figure 9 Schematic diagram of the top view structure.

[0025] In the figure: 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-waterstop steel sheet pile; 11-reinforced waterstop counterpressure layer; 12-water slide structure, 12.1-first section slide structure, 12.2-second section slide structure, 12.3-third section slide structure; 13-temporary drainage ditch. DETAILED DESCRIPTION

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

[0027] like Figure 1 The construction method of the island-building multi-stage excavation water slide shown includes the following steps: Step 1: Build an island in the water slide area like Figure 2 As shown, island construction is carried out in the water slide area to form an island platform 5. The water slide area is the water slide construction area. A 20cm-thick temporary hardened concrete road 6 is constructed around the island platform 5 as a mechanical access road. A first construction road 2 is reserved at the junction of 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 filled with clay with a low permeability coefficient. The filling area extends 20-30m outward from the water slide area, and the island platform 5 forms a supporting cofferdam structure after multiple stages of excavation. Geotextile is laid on the waterside slope of the island platform 5, and ton bags are stacked in layers. Each layer of ton bags is 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: Slideway pile foundation 8 and water-stopping and dewatering reinforcement construction like Figure 3 、 Figure 4 As shown, the pile foundation 8 is constructed from the riverside of the water slide area to the land slide area 1; Waterstop steel sheet piles 10 are installed along the perimeter of the island platform 5. These are inserted using the rotary drilling method. In this example, 800-diameter drill holes are used as guide holes for the waterstop steel sheet piles 10, with a 250mm gap between the drill holes. Guide frames are installed during installation to ensure proper alignment and water-stopping effectiveness.

[0029] High-pressure rotary grouting is used to reinforce the water-stopping counter-pressure layer 11 at the bottom of the island-building platform 5. In this embodiment, rotary grouting is performed in the area 2 to 3 meters below the excavation bottom line 4 to form an integral plate structure.

[0030] After the construction of the reinforced water-stopping counter-pressure layer 11 is completed, a drainage well 9 is constructed inside the island-building platform 5 ; the depth of the drainage well 9 is 50 cm above the reinforced water-stopping counter-pressure layer 11 .

[0031] Step 3: First-stage dewatering excavation and slideway 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, and the construction working surface of the first section slide structure 12.1 of the water slide structure 12 is excavated, and the first section slide structure 12.1 is constructed; a temporary drainage ditch 13 is constructed on the construction working surface of the first section slide structure 12.1 and above the pre-constructed second construction road 2.1. The water is lowered to 50 cm below the excavation surface through the temporary drainage ditch 13 and the dewatering well 9, and the excavation is carried out in layers; the excavation is carried out to the bottom of the three slide structures on the lower side of the first construction road 2; wherein, the first section slide structure 12.1 is a three-section slide structure. The temporary drainage ditch 13 is located at the bottom of the first section slide structure 12.1. The foundation pit support slope 7 formed by the excavation is sprayed and anchored synchronously with the excavation to ensure the stability of the foundation pit. After excavation reaches the bottom of the first slideway structure 12.1, the first slideway structure 12.1 is constructed by cast-in-place method, including pile head treatment, steel bar binding, formwork support and concrete construction. The cast-in-place construction of the slideway structure can adopt existing technology.

[0032] Step 4: Secondary dewatering excavation and slideway construction like Figure 7 、 Figure 8 As shown, a second construction road 2.1 is provided below the first slide structure, and the second construction road 2.1 serves as an access channel for equipment and materials for the second-stage soil excavation and the construction of the second-section slide structure 12.2. The second-stage soil excavation is carried out below the second construction road 2.1, and the construction working surface of the second-section slide structure 12.2 of the water area slide structure 12 is excavated, and the second-section slide structure 12.2 is constructed; a temporary drainage ditch 13 is also provided at the bottom of the second-section slide structure 12.2. The 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 process, the water is lowered to 50 cm below the excavation bottom line 4 through the temporary drainage ditch 13 until the construction working surface of the second-section slide structure 12.2 is excavated. The second-section slide structure 12.2 is also a three-frame slide structure, which belongs to the three-frame slide structure at the bottom of the water area slide structure 12.

[0033] Step 5: Third-stage dewatering excavation and slideway construction like Figure 9 、 Figure 10As shown, the third stage of soil excavation is being carried out in the area between the first construction road 2 and the second construction road 2.1, and the third section of the slideway structure 12.3 is being constructed. This third stage of soil excavation is carried out in a backward motion from the center to the sides, and construction of the third section of the slideway structure 12.3 is being carried out simultaneously. The third section of the slideway structure 12.3 located in the area of ​​the first construction road 2 is a two-segment structure, connecting the first section of the slideway structure 12.1 and the land-based slideway structure. The third section of the slideway structure 12.3 located in the area of ​​the second construction road 2.1 is a three-segment structure, connecting the first section of the slideway structure 12.1 and the second section of the slideway structure 12.2.

[0034] Step 6: Steel sheet pile removal and island demolition The water-stop steel sheet piles 10 are pulled out backward from the downstream, and the island platform 5 is cleaned; the underwater part of the island platform 5 that could not be cleaned is cleaned together with the subsequent dredging.

[0035] Based on the same inventive concept, the present invention provides a slide comprising a connected land slide and a water slide, the water slide being constructed using the aforementioned method. The water slide comprises, from top to bottom, 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, which are sequentially connected.

[0036] The present invention has the following innovative features: 1. Combining island construction with multi-stage excavation: By expanding the island to form a supporting cofferdam, staged excavation creates dry construction conditions and solves the leakage problem of traditional cofferdams.

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

[0038] 3. Interspersed construction technology: The slideway structure is constructed simultaneously during each step 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 based on the principles of the present invention are within the scope of protection of the present invention. It should be noted that for those skilled in the art, various improvements and modifications that do not depart from the principles 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 water slide, characterized in that: The following steps are involved: Step 1: construct an island in the water slide area to form an island platform; construct a hardened road outside 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 water-stop reinforcement: Advance the construction of pile foundation from the riverside of the water slide area to the land slide area; arrange water-stop steel sheet piles along the periphery of the island platform; use high-pressure rotary grouting to reinforce the water-stop back pressure layer at the bottom of the island platform to form an integral plate structure; construct a drainage well inside the island platform; Step 3: excavate the first stage of soil below the first construction road in the water slide area to form a construction working surface for the first section of the water slide structure, and construct the first section of the slide structure; Step 4: setting up a second construction road below the first slide structure, excavating a second step of soil below the second construction road to form a construction working surface for the second section of the water slide structure, and constructing the second section of the slide structure; Step 5: excavating the third stage of soil in the area of ​​the first construction road and the second construction road, and constructing the third section of the slideway structure; Step 6: Pull out the water-stop steel sheet piles and clean the island-building platform.

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

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

4. The method for constructing a multi-stage island-building water slide according to claim 1, characterized in that: The water slide structure is constructed using a cast-in-place process.

5. The method for constructing a multi-stage island-building water slide according to claim 1, characterized in that: The first section slide structure and the second section slide structure are both three-slide structures, and the third section slide structure is a three-slide structure or a two-slide structure.

6. The method for constructing a multi-stage island-building water slide according to claim 1, characterized in that: During the excavation of the first-stage soil mass and the second-stage soil mass, the foundation pit support slope formed in the island-building platform is supported by spray anchors synchronously with the excavation.

7. The method for constructing a multi-stage island-building water slide according to claim 6, characterized in that: A temporary drainage ditch is constructed at the bottom of the foundation pit supporting slope.

8. The method for constructing a multi-stage island-building water slide according to claim 1, characterized in that: In step 1, the island building platform is filled with clay.

9. The method for constructing a multi-stage island-building water slide according to claim 1, characterized in that: The waterside slope of the island-building platform is paved with geotextiles, and ton bags are stacked in layers; each layer of ton bags is tied in series with hemp ropes to form a whole.

10. A slide, characterized in that: The invention comprises a land slide and a water slide connected to each other, wherein the water slide is constructed by the method according to claim 1.

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