Transverse dewatering structure with foundation pit supporting function

Abstract

The utility model provides a transverse dewatering structure capable of supporting a foundation pit, which is applied to a post-excavated foundation pit, and the post-excavated foundation pit is separated from a pre-excavated foundation pit through a common underground diaphragm wall. The transverse dewatering structure comprises at least one sleeve hole formed in the preset supporting elevation position of the later-excavated foundation pit and a transverse dewatering assembly arranged in the sleeve hole, one end of the sleeve hole communicates with the first-excavated foundation pit, the axis of the sleeve hole is a horizontal line, and the other end of the sleeve hole communicates with the first-excavated foundation pit. The transverse dewatering assembly is used for conducting pre-dewatering on the post-excavation foundation pit and serves as a transverse supporting component of the post-excavation foundation pit. The utility model has the advantages that the transverse dewatering structure is constructed in advance, so that the traditional dewatering well construction can be canceled, and the construction space is optimized; moreover, the transverse dewatering structure can support the foundation pit while achieving dewatering, so that the construction time of the reinforced concrete support is effectively shortened, and the overall construction period is shortened.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit construction, in particular to a horizontal dewatering structure capable of taking into account the supporting function of the foundation pit. Background Art

[0002] Due to the saturation of urban surface transportation, the development and construction of urban underground space has also begun. Deep foundation pit projects are the mainstay of underground space development, and their number is constantly increasing, developing in a direction of deepness, density, and complexity. Especially in riverside and coastal areas, the construction of subway stations, underground complexes, and underground garages is unprecedented in scale, and the simultaneous construction of multiple adjacent foundation pits is becoming increasingly common. The simultaneous construction of foundation pits with various functions is called a foundation pit cluster. To reduce the stress impact of large-scale unloading, ultra-large foundation pit projects are divided into several smaller foundation pits through zoning, and these small foundation pits are also called foundation pit clusters.

[0003] To ensure efficient construction of large and deep foundation pits and minimize their impact on the surrounding environment, optimizing construction procedures, space, and equipment has become increasingly important. During the actual construction of large and deep foundation pits, dozens of dewatering wells are often required to reduce water levels. The deployment of these wells further compresses the construction space within the pits, restricting the operation of large equipment and ultimately extending the construction period. Utility Model Content

[0004] The purpose of this utility model is to provide a horizontal dewatering structure that can take into account the supporting function of the foundation pit in accordance with the above-mentioned deficiencies of the existing technology. By pre-constructing the horizontal dewatering structure, the construction of traditional dewatering wells is eliminated, and the construction space is optimized. Moreover, the horizontal dewatering structure can take into account the supporting function of the foundation pit while achieving dewatering, thereby effectively shortening the construction time of reinforced concrete support.

[0005] The purpose of this utility model is achieved by the following technical solutions:

[0006] A lateral dewatering structure that can take into account the supporting function of a foundation pit. The lateral dewatering structure is applied to a post-dig foundation pit. The post-dig foundation pit is separated from a pre-dig foundation pit by a common ground connection wall. The lateral dewatering structure includes at least one casing hole opened at a preset support elevation position of the post-dig foundation pit and a lateral dewatering component arranged in the casing hole. One end of the casing hole is connected to the pre-dig foundation pit. The axis of the casing hole is a horizontal line. The lateral dewatering component is used for pre-dewatering the post-dig foundation pit and serving as a lateral supporting component of the post-dig foundation pit.

[0007] The horizontal precipitation component includes a filter tube, a water filter steel pipe sleeved outside the filter tube, and filter material filled between the filter tube and the water filter steel pipe. The filter tube and the water filter steel pipe are both provided with a plurality of water filter holes.

[0008] The lateral dewatering assembly further includes a first geotextile filter wrapped around the outer surface of the water filtration steel pipe and a second geotextile filter wrapped around the outer surface of the filter pipe.

[0009] The lateral dewatering assembly further includes a plurality of positioning purlins arranged between the filter tube and the water filter steel pipe, and the plurality of positioning purlins are arranged at intervals in the circumferential direction of the outer periphery of the filter tube.

[0010] A positioning hole is provided on the common ground connection wall at a position corresponding to the casing hole. The positioning hole passes through the common ground connection wall and is connected to the casing hole. The lateral dewatering assembly is inserted into the casing hole from the positioning hole.

[0011] A blocking block is provided at one end of the casing hole away from the first excavated foundation pit, and the blocking block is used to prevent groundwater from flowing back into the later excavated foundation pit.

[0012] One end of the lateral dewatering assembly is fixed to the common ground connecting wall, and the other end of the lateral dewatering assembly extends to any other preset side wall position of the post-excavated foundation pit except the common ground connecting wall.

[0013] There are multiple preset support elevation positions for the post-excavation foundation pit, each of which is provided with at least one casing hole, and each casing hole is provided with a lateral dewatering component.

[0014] The advantages of this utility model are: by pre-installing the horizontal dewatering structure, the traditional dewatering well construction can be eliminated, and the construction space can be optimized; and the horizontal dewatering structure can take into account the foundation pit support function while achieving dewatering, thereby effectively shortening the reinforced concrete support construction time and reducing the overall construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the horizontal precipitation structure in the utility model;

[0016] Figure 2 It is a cross-sectional schematic diagram of the later excavation foundation pit and the earlier excavation foundation pit in the present utility model;

[0017] Figure 3 It is a transverse cross-sectional schematic diagram of the transverse precipitation component in the present utility model. DETAILED DESCRIPTION

[0018] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

[0019] like Figure 1-3As shown in the figure, marks 1-11 respectively represent: horizontal precipitation component 1, positioning hole 2, common ground connecting wall 3, post-dig foundation pit 4, pre-dig foundation pit 5, drilling pipe 6, water level line 7, water filter steel pipe 8, filter material 9, filter pipe 10, positioning purlin 11.

[0020] Example: Figure 1-3 As shown, this embodiment relates to a lateral dewatering structure that can also serve as a foundation pit support, and is used for efficient construction of foundation pit groups and reducing disturbances to the surrounding environment caused by foundation pit construction. The lateral dewatering structure is specifically applied to a post-excavation foundation pit 4, which is separated from a pre-excavation foundation pit 5 by a common ground connection wall 3. That is, in this embodiment, the pre-excavation foundation pit 5 is excavated first, while the post-excavation foundation pit 4 is excavated later than the pre-excavation foundation pit 5. Specifically, the lateral dewatering structure is disposed within the post-excavation foundation pit 4, which has not yet been excavated, and is used to pre-dewater the post-excavation foundation pit 4. The lateral dewatering structure includes at least one casing hole defined at a preset support elevation of the post-excavation foundation pit 4, and a lateral dewatering assembly 1 disposed within the casing hole. One end of the casing hole is connected to the pre-excavation foundation pit 5, and the axis of the casing hole is horizontal, meaning that the lateral dewatering assembly 1 is horizontally disposed. The lateral dewatering assembly 1 is used to pre-dewater the post-excavation foundation pit 4 and to serve as a lateral support component for the post-excavation foundation pit 4.

[0021] In this embodiment, when the first excavation pit 5 is excavated to the preset support elevation position of the later excavation pit 4, a casing hole can be drilled into the later excavation pit 4 on the common ground connection wall 3, and then the lateral dewatering component 1 can be inserted into the casing hole, and the later excavation pit 4 can be dewatered by using the lateral dewatering component 1. After the dewatering is completed, the later excavation pit 4 is further excavated. When the excavation reaches the position of the lateral dewatering component 1, the formwork can be erected for pouring, and the lateral dewatering component 1 is used as the steel skeleton of the internal support of the later excavation pit 4, that is, the concrete and the lateral dewatering component 1 together constitute the concrete support of the later excavation pit 4. Among them, the preset support elevation position refers to the position of the internal support that needs to be constructed in the later excavation pit 4 after the subsequent excavation of the later excavation pit 4.

[0022] Therefore, in this embodiment, by pre-constructing the horizontal dewatering structure, the construction of traditional dewatering wells can be eliminated and the construction space can be optimized; at the same time, the horizontal dewatering structure can take into account the support function of the foundation pit, thereby effectively shortening the construction time of the reinforced concrete support and reducing the overall construction period.

[0023] In this embodiment, a drilling pipe 6 may be used to drill a hole backward into the foundation pit 4 to form a casing hole.

[0024] In some embodiments, the horizontal dewatering assembly 1 includes a filter tube 10, a water filter steel pipe 8 sleeved outside the filter tube 10, and filter material 9 filled between the filter tube 10 and the water filter steel pipe 8. The filter tube 10 and the wall of the water filter steel pipe 8 are both provided with a plurality of water filter holes. Thus, the water filter steel pipe 8 can be used for dewatering before the excavation of the post-excavation foundation pit 4. After the excavation of the post-excavation foundation pit 4, concrete can be poured into a formwork to form the internal support steel skeleton of the post-excavation foundation pit 4. The filter material 9 can filter groundwater. The groundwater flows through the filter material 9 through the water filter holes provided in the wall of the water filter steel pipe 8, then flows into the filter tube 10, and the filtered water is then pumped out from the filter tube 10.

[0025] In some embodiments, the lateral dewatering assembly 1 further includes a first geofilter wrapped around the outer surface of the water filter steel pipe 8 and a second geofilter wrapped around the outer surface of the filter pipe 10. By providing the first and second geofilters, groundwater can be further filtered and water collection capacity can be improved.

[0026] In other embodiments, the lateral dewatering assembly 1 further includes a plurality of positioning purlins 11 disposed between the filter tube 10 and the water filter steel pipe 8. The plurality of positioning purlins 11 are circumferentially spaced apart around the outer periphery of the filter tube 10. By circumferentially spaced apart between the filter tube 10 and the water filter steel pipe 8, the central axis of the filter tube 10 is ensured to coincide with the central axis of the water filter steel pipe 8, allowing the filter material 9 to be evenly filled around the outer periphery of the filter tube 10.

[0027] In this embodiment, optionally, a positioning hole 2 is opened on the common ground connecting wall 3 at a position corresponding to the casing hole. The positioning hole 2 passes through the common ground connecting wall 3 and is connected to the casing hole, and the lateral dewatering assembly 1 is inserted into the casing hole from the positioning hole 2. In other words, when the first excavation pit 5 is excavated to the preset support elevation of the later excavation pit 4, the positioning hole 2 can be first constructed on the common ground connecting wall 3, and then the casing hole can be formed by drilling and expanding the later excavation pit 4 in alignment with the positioning hole 2. Then, the lateral dewatering assembly 1 is inserted into the casing hole from the positioning hole 2, and the later excavation pit 4 is dewatered by the lateral dewatering assembly 1. By controlling the drilling angle, speed, etc., a casing hole that meets the designed length and diameter can be obtained.

[0028] In some embodiments, a blocking block is provided at the end of the casing hole away from the first excavated foundation pit 5 to prevent groundwater from flowing back into the second excavated foundation pit 4. For example, cement slurry can be used to block the area within about 1000 mm from the distal end of the lateral dewatering assembly 1 to form a blocking block to prevent water from flowing back into the second excavated foundation pit 4.

[0029] In this embodiment, one end of the lateral dewatering assembly 1 is fixed to the common ground-connecting wall 3, and the other end of the lateral dewatering assembly 1 extends to any other preset side wall position of the post-dig foundation pit 4, excluding the common ground-connecting wall 3. For example, the post-dig foundation pit 4 is designed to be rectangular, and the common ground-connecting wall 3 is located between the post-dig foundation pit 4 and the pre-dig foundation pit 5. One end of the lateral dewatering assembly 1 is set at the common ground-connecting wall 3, and the other end is set on any other rectangular side of the post-dig foundation pit 4, excluding the common ground-connecting wall 3. This facilitates the subsequent excavation of the post-dig foundation pit 4, so that the two ends of the lateral dewatering assembly 1 can effectively support the two side walls of the post-dig foundation pit 4 when pouring concrete support.

[0030] In some embodiments, the post-excavation pit 4 has multiple preset support elevations, each of which is provided with at least one casing hole, each of which is equipped with a horizontal dewatering assembly 1. In other words, if the post-excavation pit 4 is designed to require internal supports at multiple preset support elevations, at least one horizontal dewatering structure should be installed at each preset support elevation. This achieves multi-layer dewatering while also providing internal supports at multiple heights. In this case, a horizontal dewatering structure should be constructed each time the pre-excavation pit 5 reaches a preset support elevation for the post-excavation pit 4.

[0031] In summary, the beneficial effects of the present invention are: by pre-constructing a horizontal dewatering structure, the construction of traditional dewatering wells can be eliminated, thereby optimizing the construction space; and, the horizontal dewatering structure can take into account the foundation pit support function while achieving dewatering, thereby effectively shortening the construction time of reinforced concrete support and reducing the overall construction period.

[0032] Unless otherwise defined, the technical or scientific terms used herein shall have the usual meaning understood by persons of ordinary skill in the field to which the present invention belongs. The words "first", "second" and similar terms used in the specification and claims of the present utility model patent application do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "a" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "connected" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship also changes accordingly.

[0033] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles described in the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A lateral dewatering structure that can also support the foundation pit, characterized in that: The lateral dewatering structure is applied to a post-dig foundation pit, which is separated from a pre-dig foundation pit by a common ground connection wall. The lateral dewatering structure includes at least one casing hole opened at a preset support elevation position of the post-dig foundation pit and a lateral dewatering component arranged in the casing hole. One end of the casing hole is connected to the pre-dig foundation pit, and the axis of the casing hole is a horizontal line. The lateral dewatering component is used for pre-dewatering the post-dig foundation pit and serving as a lateral support component of the post-dig foundation pit.

2. The lateral precipitation structure according to claim 1, characterized in that: The horizontal precipitation component includes a filter tube, a water filter steel pipe sleeved outside the filter tube, and filter material filled between the filter tube and the water filter steel pipe. The filter tube and the water filter steel pipe are both provided with a plurality of water filter holes.

3. The lateral precipitation structure according to claim 2, characterized in that: The lateral dewatering assembly further includes a first geotextile filter wrapped around the outer surface of the water filtration steel pipe and a second geotextile filter wrapped around the outer surface of the filter pipe.

4. The lateral precipitation structure according to claim 2 or 3, characterized in that: The lateral dewatering assembly further includes a plurality of positioning purlins arranged between the filter tube and the water filter steel pipe, and the plurality of positioning purlins are arranged at intervals in the circumferential direction of the outer periphery of the filter tube.

5. The lateral precipitation structure according to claim 1, characterized in that: A positioning hole is provided on the common ground connection wall at a position corresponding to the casing hole. The positioning hole passes through the common ground connection wall and is connected to the casing hole. The lateral dewatering assembly is inserted into the casing hole from the positioning hole.

6. The lateral precipitation structure according to claim 1, characterized in that: A blocking block is provided at one end of the casing hole away from the first excavated foundation pit, and the blocking block is used to prevent groundwater from flowing back into the later excavated foundation pit.

7. The lateral precipitation structure according to claim 1, characterized in that: One end of the lateral dewatering assembly is fixed to the common ground connecting wall, and the other end of the lateral dewatering assembly extends to any other preset side wall position of the post-excavated foundation pit except the common ground connecting wall.

8. The lateral precipitation structure according to claim 1, characterized in that: There are multiple preset support elevation positions for the post-excavation foundation pit, each of which is provided with at least one casing hole, and each casing hole is provided with a lateral dewatering component.

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