Light well point dewatering device

Abstract

The utility model discloses a light well-point dewatering device which comprises a foundation pit support structure, a light well-point dewatering device body and a light well-point dewatering device body, and the foundation pit support structure body is a Larsen steel sheet pile; the water filtering steel plates are welded in grooves of the Larsen steel plate piles on the inner side of the foundation pit support structure according to a preset spacing distance, the upper end faces of the water filtering steel plates are not lower than the ground elevation, and the lower end faces of the water filtering steel plates are not higher than the lower end faces of the Larsen steel plate piles; a plurality of downcast pipes are arranged, and each downcast pipe is vertically inserted into a groove of the Larsen steel sheet pile connected with the water filtering steel plate; and the outer water filter screen is positioned in the water filter steel plate and the groove of the Larsen steel sheet pile connected with the water filter steel plate and wraps the lower end of the downcast pipe. The device is simple in construction, high in efficiency, high in safety and free of influence on supporting and erecting of a foundation pit and does not occupy a working face in the foundation pit, and dug soil does not touch the downcast pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of construction engineering, and particularly relates to a light well point dewatering device. Background Technique

[0002] For dewatering within a cofferdam or a foundation pit retaining structure, generally, dewatering pipes are buried in the construction area around the cofferdam or foundation pit. Usually, methods such as the water jetting method are used to install equipment to form holes with a diameter of 100 - 150 mm. A seamless steel pipe with a diameter of 75 - 100 mm and a filter mesh with a length of 50 - 1000 mm at the head is buried vertically into the construction area as the dewatering pipe. Then, the gap between the formed hole and the dewatering pipe is filled with sand and gravel, and 500 mm is left at the upper part to be sealed tightly with clay or concrete to prevent air leakage. Each dewatering pipe is connected to a horizontal pipe with a flexible hose, and a high-pressure water pump is used to pump water to lower the water level inside the cofferdam or foundation pit. The disadvantages of this dewatering device are as follows:

[0003] 1. Dewatering within the foundation pit retaining structure affects earth excavation. During the excavation process, the dewatering pipes will be damaged, occupying the working surface and affecting the erection of the foundation pit support.

[0004] 2. It is not applicable to locations with narrow construction space and deep excavation depth. Content of the Utility Model

[0005] The purpose of the utility model is to provide a light well point dewatering device to solve the problems that the traditional light well point dewatering device requires hole formation, burial, filling, and sealing, resulting in complex construction technology, low construction efficiency, affecting earth excavation, being prone to damage the dewatering pipes during the excavation process, and affecting the erection of the foundation pit support.

[0006] To solve the above technical problems, the technical solution provided by the utility model is: a light well point dewatering device, including:

[0007] A foundation pit retaining structure, and the foundation pit retaining structure is a Larssen steel sheet pile;

[0008] A filter water steel plate, welded in the groove of the Larssen steel sheet pile on the inner side of the foundation pit retaining structure at a predetermined interval distance. The upper end surface of the filter water steel plate is not lower than the ground elevation, and the lower end surface of the filter water steel plate is not higher than the lower end surface elevation of the Larssen steel sheet pile;

[0009] Dewatering pipes, which are multiple. Each dewatering pipe is vertically inserted into the groove of the filter water steel plate and the Larssen steel sheet pile connected thereto;

[0010] An outer filter mesh, located in the groove of the filter water steel plate and the Larssen steel sheet pile connected thereto, wrapping the lower end of the dewatering pipe.

[0011] Furthermore, the light well point dewatering device provided by the utility model further includes:

[0012] The beveled closure plate is inclined and arranged between the water-filtering steel plate and the Larssen steel sheet pile. / / At this time, there is a height difference between the lower end faces of the grooves of the water-filtering steel plate and the Larssen steel sheet pile.

[0013] Furthermore, the light well point dewatering device provided by the present utility model further includes:

[0014] A cofferdam retaining structure to replace the foundation pit retaining structure.

[0015] Furthermore, for the light well point dewatering device provided by the present utility model, the downcomer is a seamless steel pipe, and the lower end of the seamless steel pipe is provided with water-filtering holes and an inner water-filtering net.

[0016] Furthermore, for the light well point dewatering device provided by the present utility model, the water-filtering steel plate includes a plurality of water-permeable holes.

[0017] Furthermore, for the light well point dewatering device provided by the present utility model, the water-permeable holes are arranged at intervals along the height direction of the water-filtering steel plate.

[0018] Furthermore, for the light well point dewatering device provided by the present utility model, the water-permeable holes are arranged continuously along the height direction of the water-filtering steel plate.

[0019] Furthermore, for the light well point dewatering device provided by the present utility model, the predetermined interval distance between the water-filtering steel plate and the downcomer on the Larssen steel sheet pile is 10 - 15 m.

[0020] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0021] For the light well point dewatering device provided by the present utility model, the Larssen steel sheet pile is used as the foundation pit retaining structure. By welding the water-filtering steel plate in the groove of the Larssen steel sheet pile on the inner side of the foundation pit retaining structure, and vertically inserting each downcomer into the groove of the water-filtering steel plate connected to the Larssen steel sheet pile, when the Larssen steel sheet pile is constructed as the foundation pit retaining structure, the downcomer, the water-filtering steel plate and the outer water-filtering net are constructed synchronously with the Larssen steel sheet pile. Compared with the construction process of the traditional light well point dewatering device, it has the advantages of simple construction and high construction efficiency; the foundation pit is dewatered by the downcomers distributed at a predetermined interval distance, and the water-filtering steel plate protects the downcomers. Thus, when excavating the foundation pit soil, the excavating equipment will not touch the downcomers, avoiding the possibility of damaging the downcomers, thereby improving the safety of construction and dewatering; by welding the water-filtering steel plate in the groove of the Larssen steel sheet pile, it will not contact the downcomer when the foundation pit support is set up. The foundation pit support can be set on the water-filtering steel plate or the convex plate of the Larssen steel sheet pile on the inner side of the foundation pit retaining structure, so that the downcomer does not affect the setting of the foundation pit support and does not occupy the working surface inside the foundation pit retaining structure. Description of the Drawings

[0022] Figure 1 It is a schematic plan view of a light well point dewatering device;

[0023] Figure 2 It is a schematic elevation view of the arrangement of the downcomer and the filter steel plate of the light well point dewatering device in a groove of the sheet pile wall on the inner side of the foundation pit retaining structure;

[0024] As shown in the figure:

[0025] 100, light well point dewatering device; 110, sheet pile wall; 111, sheet pile; 120, filter steel plate; 121, water permeable holes; 130, downcomer; 131, inner filter screen; 140, outer filter screen; 150, beveled closure plate. Specific embodiments

[0026] The present invention will be described in detail below with reference to the accompanying drawings: According to the following description, the advantages and features of the present invention will be clearer. It should be noted that the drawings are all in a very simplified form and use non-precise scales, only for the purpose of conveniently and clearly assisting in explaining the purpose of the embodiments of the present invention.

[0027] Embodiment 1

[0028] Please refer to Figures 1 to 2 , Embodiment 1 of the present invention provides a light well point dewatering device 100, including a foundation pit retaining structure, a filter steel plate 120, a downcomer 130, and an outer filter screen 140, wherein:

[0029] The foundation pit retaining structure is a sheet pile wall 110. The sheet pile wall 110 is composed of sheet piles 111 spliced together in a positive and negative manner.

[0030] The filter steel plate 120 is welded in a groove of the sheet pile wall 110 on the inner side of the foundation pit retaining structure at a predetermined interval distance. In order to block the sediment in the soil layer and allow water to permeate, a number of water permeable holes 121 are provided on the filter steel plate 120. The upper end surface of the filter steel plate 120 may not be lower than the ground elevation, and the lower end surface of the filter steel plate 120 may not be higher than the elevation of the lower end surface of the sheet pile wall 110

[0031] The downcomer 130 is multiple, and each downcomer 130 is vertically inserted and arranged in a groove of the filter steel plate 120 and the sheet pile wall 110 connected thereto. In order to effectively dewater the foundation pit, one downcomer 130 can be arranged every 10 - 15 m, and the corresponding predetermined interval distance of the filter steel plate 120 is also 10 - 15 m. The downcomer 130 can be a seamless steel pipe, and the lower end of the seamless steel pipe has filter holes (not shown) and an inner filter screen 131. The sediment in the soil layer in the foundation pit is filtered through the filter holes and the inner filter screen 131, and the water permeates through the filter holes and the inner filter screen 131 and enters the downcomer 130.

[0032] The external water filtration net 140 is located in the groove of the sheet pile 110 connected to the water filtration steel plate 120 and wraps the lower end of the downcomer 130.

[0033] The light well point dewatering device 100 provided in the first embodiment of the present invention uses the sheet pile 110 as the foundation pit retaining structure. By welding the water filtration steel plate 120 in the groove of the sheet pile 110 on the inner side of the foundation pit retaining structure and vertically inserting each downcomer 130 into the groove of the water filtration steel plate 120 connected to the sheet pile 110, when the sheet pile 110 is constructed as the foundation pit retaining structure, the downcomer 130, the water filtration steel plate 120 and the external water filtration net 140 are constructed synchronously with the sheet pile 110. Compared with the construction process of the traditional light well point dewatering device 100, it has the advantages of simple construction and high construction efficiency.

[0034] The light well point dewatering device 100 provided in the first embodiment of the present invention dewaters the foundation pit through the downcomers 130 distributed at a predetermined interval distance and the protection of the water filtration steel plate 120 for the downcomers 130. Thus, when excavating the soil in the foundation pit, the excavating equipment will not touch the downcomers 130, avoiding the possibility of damaging the downcomers 130, and thus improving the safety of construction and dewatering.

[0035] The light well point dewatering device 100 provided in the first embodiment of the present invention does not contact the downcomers 130 when the foundation pit support is set up through the water filtration steel plate 120 welded in the groove of the sheet pile 110. The foundation pit support can be set on the water filtration steel plate 120 or the convex plate of the sheet pile 110 on the inner side of the foundation pit retaining structure, so that the downcomers 130 do not affect the setting of the foundation pit support and do not occupy the working surface inside the foundation pit retaining structure.

[0036] Please refer to Figure 2 , in order to facilitate the synchronous construction of the downcomers 130, the water filtration steel plate 120 and the external water filtration net 140 with the sheet pile 110, the light well point dewatering device 100 provided in the first embodiment of the present invention may further include:

[0037] The inclined mouth sealing plate 150 is inclined and arranged between the water filtration steel plate 120 and the sheet pile 110. At this time, there is a height difference between the lower end surface of the groove of the water filtration steel plate 120 and the sheet pile 110, that is, the lower end of the water filtration steel plate 120 is slightly lower than the elevation of the lower end of the sheet pile 110. The inclination angle of the inclined mouth sealing plate 150 can be an acute angle such as 30 degrees or 45 degrees, so that the sheet pile 110 and the water filtration steel plate 120 are opposite to the tip through the inclined mouth sealing plate 150, which is convenient for deep insertion into the soil body.

[0038] Please refer to Figure 2, in order to facilitate water penetration and block the sediment in the soil within the foundation pit, the light well point dewatering device 100 provided in the first embodiment of the present utility model has the water permeable holes 121 arranged at intervals or continuously along the height direction of the filter steel plate 120. The water permeable holes 121 can be distributed in a row-column matrix or in a row-column matrix teaching distribution.

[0039] Embodiment Two

[0040] The light well point dewatering device 100 provided in the second embodiment of the present utility model is improved on the basis of the first embodiment. The difference is that it further includes:

[0041] A cofferdam retaining structure to replace the foundation pit retaining structure. At this time, the Larssen steel sheet pile 110 serves as the cofferdam retaining structure. After use, it can be demolished and reused multiple times, which has the effect of energy conservation and environmental protection.

[0042] When the light well point dewatering device 100 provided in the above embodiments of the present utility model is in use, it is connected to a high-pressure water pump through pipelines. By pumping water with the high-pressure water pump, the dewatering range of the downcomer 130 can be concentrated inside the Larssen steel sheet pile 110, which can improve the dewatering effect. It can solve the foundation pit dewatering problems such as cofferdams and narrow sites that require foundation pit support and dewatering.

[0043] The present utility model is not limited to the above specific embodiments. Obviously, the described embodiments are part of the embodiments of the present utility model, rather than all the embodiments. Based on the described embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present utility model. Those skilled in the art can make other levels of modifications and changes to the present utility model. Thus, if these modifications and changes of the present utility model are within the scope of the claims of the present utility model, the present utility model also intends to include these modifications and changes.

Claims

1. A light well point dewatering device, characterized in that, Comprising: A foundation pit retaining structure, which is a Larssen steel sheet pile; A water filtering steel plate, welded in the groove of the Larssen steel sheet pile on the inner side of the foundation pit retaining structure at a predetermined interval distance, the upper end surface of the water filtering steel plate is not lower than the ground elevation, and the lower end surface of the water filtering steel plate is not higher than the lower end surface elevation of the Larssen steel sheet pile; Dewatering pipes, which are multiple, and each dewatering pipe is vertically inserted into the groove of the water filtering steel plate connected thereto and the Larssen steel sheet pile; An outer water filtering net, located in the groove of the water filtering steel plate connected thereto and the Larssen steel sheet pile and wrapping the lower end of the dewatering pipe.

2. The light well point dewatering device according to claim 1, wherein Further comprising: An inclined end plate, inclined and arranged between the water filtering steel plate and the Larssen steel sheet pile.

3. The light well point dewatering device according to claim 1, characterized in that, Further comprising: A cofferdam retaining structure, replacing the foundation pit retaining structure.

4. The light well point dewatering device according to claim 1, wherein, The dewatering pipe is a seamless steel pipe, and the lower end of the seamless steel pipe has water filtering holes and an inner water filtering net.

5. The light well point dewatering device according to claim 1, characterized in that, The water filtering steel plate includes a plurality of water permeable holes.

6. The light well point dewatering device according to claim 5, characterized in that, The water permeable holes are arranged at intervals along the height direction of the water filtering steel plate.

7. The light well point dewatering device according to claim 5, characterized in that, The water permeable holes are continuously arranged along the height direction of the water filtering steel plate.

8. The light well point dewatering device according to claim 1, wherein, The predetermined interval distance of the water filtering steel plate and the dewatering pipe on the Larssen steel sheet pile is 10 - 15m.

Images