Geocofferdam construction system for immersed tube sand pumping

Abstract

The utility model discloses an immersed tube sand pumping geocofferdam construction system, which belongs to the technical field of cofferdam construction and comprises a sand pumping pool, a sand pump, a sand conveying pipe and a cofferdam. A mixture of water and fine sand is placed in the sand pumping pool; the sand pump is communicated with the sand pumping pool; the sand conveying pipe is connected with the sand pump; the cofferdam comprises a main enclosure structure and a reinforcing structure. The main enclosure structure comprises stacked sand bags; the reinforcing structure is arranged on the side portion of the main enclosure structure in an attached mode and comprises stacked sand bags. And the sand bag is communicated with the sand conveying pipe for sand filling. The sand pumping pump is matched with the sand conveying pipe to carry out long-distance sand pumping, the sand pumping device can enter a mud flat area regardless of terrains and without equipment vehicles, normal construction can still be carried out even if the overwater tidal range is large and the operation time is short, and the construction efficiency is effectively improved; the main enclosure structure and the reinforcing structure are adopted as the cofferdam together, the strength of the cofferdam is guaranteed, and meanwhile the problems that an earth rock cofferdam and a steel sheet pile cofferdam are serious in pollution and high in noise, and a steel trestle platform needs to be erected are solved.

Description

Technical Field

[0001] The utility model belongs to the technical field of cofferdam construction, and particularly relates to a geotechnical cofferdam construction system for a submerged tube sand pump. Background Art

[0002] There are more and more water conservancy projects in contemporary society. The theoretical content of cofferdam technology is to play a temporary protection measure for the enclosing structure in the construction of water conservancy projects, which is beneficial to protecting the environment and enhancing construction safety.

[0003] At present, the main method of cofferdam construction is to transport materials by vehicles and perform corresponding operations on land. However, in the mudflat area or when there is a tide, vehicles and equipment cannot be used for transportation and construction. At the same time, if there are interferences such as waterways or bridges, ships and equipment cannot enter the construction site, which seriously restricts construction efficiency. Utility Model Content

[0004] The utility model aims to provide a geotechnical cofferdam construction system for immersed tube sand pumping, so as to solve the problem in the above-mentioned background technology that vehicles and equipment for cofferdam construction are difficult to construct efficiently in tidal flat areas or when there are tides, thereby reducing construction efficiency.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A geotechnical cofferdam construction system for immersed tube sand pumping comprises a sand pumping pool, a sand pump, a sand conveying pipe and a cofferdam; a mixture of water and fine sand is placed in the sand pumping pool; the sand pump and the sand pumping pool are connected; the sand conveying pipe is connected to the sand pump; the cofferdam comprises a main enclosure structure and a reinforcement structure; the main enclosure structure comprises stacked sand bags; the reinforcement structure is fitted on the side of the main enclosure structure and comprises stacked sand bags; the sand bags are connected to the sand conveying pipe for sand filling.

[0007] Furthermore, it also includes a sand storage area, which is arranged on both sides of the sand pumping pool, and the fine sand is transported to the sand pumping pool by a transport vehicle.

[0008] Furthermore, it also includes a water pump, which is connected to the sand pump pool.

[0009] Furthermore, it also includes a floating platform, which is arranged on the water surface.

[0010] Furthermore, coarse sand and geotextile are provided at the bottom of the main enclosure structure and the reinforcement structure; the coarse sand is laid at the bottom of the river bank; and the geotextile is laid on the coarse sand.

[0011] Furthermore, the cross-section of the main enclosure structure is an isosceles trapezoid and is formed by stacking multiple layers of sand bags.

[0012] Furthermore, the cross-section of the reinforcement structure is a parallelogram, and is formed by stacking multiple layers of sand bags, with loose sand arranged on the top, and the top surface of the loose sand is flush with the top surface of the main enclosure structure.

[0013] Furthermore, the sand conveying pipe is a special sand pumping hose, which comprises a thickened nylon cord layer and a wear-resistant rubber layer from the outside to the inside.

[0014] The utility model has the following beneficial effects:

[0015] 1. The utility model provides a geotechnical cofferdam construction system for submerged tube sand pumping. Through the cooperation of a sand pump and a sand delivery pipe, sand can be pumped over a long distance, regardless of the terrain. No equipment or vehicles are required to enter the tidal flat area. Even if the tidal range on the water is large and the operating time is short, normal construction can still be carried out, effectively improving construction efficiency.

[0016] 2. The utility model provides a geotechnical cofferdam construction system for submerged tube sand pumping. The sand conveying pipe is easy to assemble and connect, which can improve the efficiency of sand transportation and pouring, and the construction cost is low, which has good economic benefits.

[0017] 3. The utility model provides a geotechnical cofferdam construction system for immersed tube sand pumping, which adopts the main retaining structure and the reinforcement structure as the cofferdam to ensure the strength of the cofferdam. At the same time, it avoids the problems of serious pollution, high noise, and the need to build a steel trestle platform of earth-rock cofferdams and steel sheet pile cofferdams. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the layout of the cofferdam construction system involved in the utility model;

[0019] Figure 2 It is a schematic diagram of the layout of the sand storage area involved in the utility model;

[0020] Figure 3 It is a cross-sectional schematic diagram of the cofferdam involved in the utility model.

[0021] In the figure: 1-sand pumping pool, 2-sand storage area, 3-transport vehicle, 4-sand pump, 5-sand conveying pipe, 6-water pump, 7-floating platform, 8-cofferdam, 81-main retaining structure, 82-reinforcement structure. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] like Figure 1-3As shown, the utility model provides a geotechnical cofferdam construction system for immersed tube sand pumping, comprising a sand pumping pool 1, a sand storage area 2, a sand pumping pump 4, a sand conveying pipe 5, a water pump 6, a floating platform 7 and a cofferdam 8; the sand pumping pool 1 is used to place a mixture of water and fine sand; the sand storage area 2 is used to place fine sand, and the fine sand is transported to the sand pumping pool 1 by a transport vehicle 3; the sand pumping pump 4 is connected to the sand pumping pool 1; the sand conveying pipe 5 is connected to the sand pumping pump 4; the water pump 6 is connected to the sand pumping pool 1 to convey water to the sand pumping pool 1, and the water and fine sand are mixed into water sand in the sand pumping pool 1, which is convenient for the sand pumping pump 4 to carry out pumping and transportation; the floating platform 7 is arranged on the water surface to provide an operating space for the dragging and connection of the sand conveying pipe 5; the cofferdam 8 comprises a main enclosure structure 81 and a reinforcement structure 82, and the main enclosure structure 81 comprises stacked sand bags; the reinforcement structure 82 is fitted on the side of the main enclosure structure 81, and comprises stacked sand bags, and the sand bags are connected to the sand conveying pipe 5.

[0024] The transport vehicle 3 transports the fine sand from the sand storage area 2 to the sand pumping pool 1, and the water pump 6 pumps water into the sand pumping pool 1. The fine sand and water are mixed into water sand in the sand pumping pool 1. Under the action of the sand pump 4, the water sand enters the sand bag through the sand conveying pipe 5 to form a cofferdam 8.

[0025] The sand pump pool 1 is a steel box structure.

[0026] The sand storage area 2 is arranged on both sides of the sand pumping pool 1 to reduce the transportation distance.

[0027] The sand conveying pipe 5 is a special sand pumping hose, which includes a thickened nylon cord layer and a wear-resistant rubber layer from the outside to the inside. The connection position of the sand conveying pipe 5 is connected by a flange.

[0028] Coarse sand and geotextile are arranged at the bottom of the main enclosure structure 81 and the reinforcement structure 82; the coarse sand is laid at the bottom of the river bank; the geotextile is laid on the coarse sand. Preferably, the geotextile is a high-strength geotextile. The thickness of the coarse sand is greater than 30 cm.

[0029] The main enclosure structure 81 has an isosceles trapezoidal cross section and is formed by stacking multiple layers of sandbags. The reinforcement structure 82 has a parallelogram cross section and is formed by stacking multiple layers of sandbags, with loose sand arranged on the top thereof, and the top surface of the loose sand is flush with the top surface of the main enclosure structure 81 .

[0030] A method for constructing a geotechnical cofferdam 8 for a submerged tube sand pump comprises the following steps:

[0031] S1. Arrange the sand pumping pool 1, sand storage area 2, sand pump 4, water pump 6 and floating platform 7 according to the design drawings;

[0032] S2, connecting the sand conveying pipe 5; connect one end of the sand conveying pipe 5 to the sand pump 4, and then connect it on the caisson upward, generally 100-200m, and then seal its end, roll it and drop it on the water surface, and drag the end of the sand conveying pipe 5 to the designed position of the cofferdam 8 through the floating platform 7. If the length is not enough, continue to connect on the floating platform 7 until the end of the sand conveying pipe 5 reaches the designed position of the cofferdam 8;

[0033] S3, fix the end of the sand conveying pipe 5 through the floating platform 7, and then open the seal; transport water into the sand pumping pool 1 through the water pump 6, and then transport water into the sand conveying pipe 5 through the sand pump 4, use the water gravity to sink the sand conveying pipe 5, and flash the light mark at the position of the sand conveying pipe 5;

[0034] S4, positioning of cofferdam 8: measure and lay out the lines according to the construction scope map, measure and locate the points of cofferdam 8, and mark the edge lines; the route layout of cofferdam 8 and the sand filling of cofferdam 8 are carried out simultaneously, and deviations are corrected in time;

[0035] S5. Sandbag arrangement: At low tide, a layer of coarse sand is laid at the bottom of the river bank, and then a layer of geotextile is laid on the coarse sand. Then, according to the construction settlement, sandbags are gradually placed on the geotextile. At the same time, steel pipes are inserted into the riverbed along the four sides of the sandbags to position the sandbags and prevent them from drifting.

[0036] S6. Fine sand is transported from the sand storage area 2 to the sand pumping pool 1 by the transport vehicle 3, water is transported into the sand pumping pool 1 by the water pump 6, and then mixed into water sand. The sand pump 4 pumps the fine sand into the sand bag through the sand conveying pipe 5 and fills the sand bag to 80% of its volume. After filling each layer of sand bags, measurements and observations are carried out to see if there is any settlement. If the settlement is large, it is necessary to wait until the settlement is stable before the subsequent sand bag filling can be carried out. Filling and filling are carried out layer by layer until the design elevation is reached.

[0037] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A geotechnical cofferdam construction system for immersed tube sand pumping, characterized by: The invention comprises a sand pumping pool (1), a sand pump (4), a sand conveying pipe (5) and a cofferdam (8); a mixture of water and fine sand is placed in the sand pumping pool (1); the sand pump (4) and the sand pumping pool (1) are connected; the sand conveying pipe (5) is connected to the sand pump (4); the cofferdam (8) comprises a main enclosure structure (81) and a reinforcement structure (82); the main enclosure structure (81) comprises stacked sand bags; the reinforcement structure (82) is fitted on the side of the main enclosure structure (81) and comprises stacked sand bags; the sand bags are connected to the sand conveying pipe (5) for sand filling.

2. A geotechnical cofferdam construction system for immersed tube sand pumping according to claim 1, characterized in that: It also comprises a sand storage area (2), which is arranged on both sides of the sand pumping pool (1) and transports fine sand into the sand pumping pool (1) via a transport vehicle (3).

3. The geotechnical cofferdam construction system for immersed tube sand pumping according to claim 1 is characterized by: It also comprises a water pump (6), wherein the water pump (6) is connected to the sand pump pool (1).

4. The geotechnical cofferdam construction system for immersed tube sand pumping according to claim 1 is characterized by: It also comprises a floating platform (7), wherein the floating platform (7) is arranged on the water surface.

5. The geotechnical cofferdam construction system for immersed tube sand pumping according to claim 1, characterized in that: Coarse sand and geotextile are provided at the bottom of the main enclosure structure (81) and the reinforcement structure (82); the coarse sand is laid at the bottom of the river bank; and the geotextile is laid on the coarse sand.

6. The geotechnical cofferdam construction system for immersed tube sand pumping according to claim 1, characterized in that: The main enclosure structure (81) has an isosceles trapezoidal cross section and is formed by stacking multiple layers of sand bags.

7. The geotechnical cofferdam construction system for immersed tube sand pumping according to claim 1, characterized in that: The reinforcement structure (82) has a parallelogram cross-section and is formed by stacking multiple layers of sand bags, with loose sand arranged on the top, and the top surface of the loose sand is flush with the top surface of the main enclosure structure (81).

8. The geotechnical cofferdam construction system for immersed tube sand pumping according to claim 1, characterized in that: The sand conveying pipe (5) is a special sand pumping hose, which comprises a thickened nylon cord layer and a wear-resistant rubber layer from the outside to the inside.

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