Temporary supporting device for deep foundation pit

Abstract

The utility model belongs to the technical field of building construction, and particularly relates to a temporary supporting device of a deep foundation pit, which comprises a sand pile wall and a steel sheet pile wall, the steel sheet pile wall is arranged in the sand pile wall, the sand pile wall is composed of a plurality of first sand piles arranged at intervals, a steel sheet pile is arranged in each first sand pile, and the plurality of steel sheet piles are sequentially connected to form the steel sheet pile wall. The steel sheet pile wall is arranged in the sand pile wall, so that the pile sinking resistance of the steel sheet pile is reduced, and the steel sheet pile is protected by the sand pile wall during excavation.

Description

Technical Field

[0001] The utility model belongs to the technical field of building construction, and in particular relates to a temporary supporting device for a deep foundation pit. Background Art

[0002] During the construction of deep foundation pits inside the foundation pits, since some buildings have been completed and the foundation pits have supporting structures, the construction site of the deep foundation pits is narrow. If the excavation is carried out directly, it will affect the buildings that have been completed. Therefore, it is necessary to support the surrounding areas inside the deep foundation pits before excavating them. The existing technology uses supporting structures such as ground-connected walls and pile rows for support, which has high construction costs and long construction periods. If steel sheet piles are used directly for support, since the geological strata in the middle of the excavation depth of the deep foundation pits are relatively hard and the lower part is a sand layer, direct construction of steel sheet piles may damage the steel plate structure during the excavation of the deep foundation pits.

[0003] Therefore, the utility model provides a temporary supporting device for a deep foundation pit. Utility Model Content

[0004] The problem to be solved by the utility model is: how to protect the steel plate structure during the construction of steel sheet piles.

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

[0006] A temporary support device for a deep foundation pit comprises a sand pile wall and a steel sheet pile wall. The steel sheet pile wall is arranged in the sand pile wall. The sand pile wall is composed of a plurality of sand piles arranged at intervals. A steel sheet pile is arranged in each sand pile. A plurality of steel sheet piles are sequentially connected to form the steel sheet pile wall.

[0007] Furthermore, the steel sheet piles include U-shaped steel sheet piles, both ends of the U-shaped steel sheet piles are provided with lock buckles, and a plurality of U-shaped steel sheet piles are connected in sequence by the lock buckles.

[0008] Furthermore, a grouting layer is provided on the outer side of the steel sheet pile wall.

[0009] Furthermore, the sand piles include a first sand pile; a U-shaped steel sheet pile is arranged in the middle of the first sand pile, the length of the U-shaped steel sheet pile is equal to 400 mm, and the length of the U-shaped steel sheet pile is equal to the center distance between adjacent first sand piles; the width of the U-shaped steel sheet pile is 100 mm, and the thickness of the U-shaped steel sheet pile is 10.5 mm; the diameter of the first sand pile is 300 mm.

[0010] Furthermore, the sand piles include a first sand pile; a U-shaped steel sheet pile is arranged in the middle of the first sand pile, the length of the U-shaped steel sheet pile is 500 mm, and the length of the U-shaped steel sheet pile is equal to the center distance between adjacent first sand piles; the width of the U-shaped steel sheet pile is 200 mm, and the thickness of the U-shaped steel sheet pile is 24.3 mm; the diameter of the first sand pile is 400 mm.

[0011] Furthermore, the depth of the steel sheet pile is 12m-15m, the bottom of the first sand pile is located below the bottom of the steel sheet pile, and the distance between the bottom of the first sand pile and the bottom of the steel sheet pile is 0.5m-1.0m.

[0012] Furthermore, the temporary support device for the deep foundation pit also includes an I-shaped steel sheet pile and a second sand pile. The steel sheet pile wall has at least one corner. The I-shaped steel sheet pile is located at the corner of the steel sheet pile wall, and the I-shaped steel sheet pile is arranged in the middle of the second sand pile. The diameter of the second sand pile is 150mm-180mm; the I-shaped steel sheet pile is composed of an I-shaped body and locks at both ends. The locks at both ends of the I-shaped steel sheet pile are respectively connected to the locks of the U-shaped steel sheet piles on both sides.

[0013] Furthermore, the angle between the U-shaped steel sheet pile and the I-shaped steel sheet pile on the inner side of the wall at the corner of the steel sheet pile wall is 45°, the I-shaped steel sheet pile is the first I-shaped steel sheet pile, and the angle between the I-shaped body of the first I-shaped steel sheet pile and the lock is 45°.

[0014] Furthermore, the angle between the U-shaped steel sheet pile and the I-shaped steel sheet pile on the inner side of the wall at the corner of the steel sheet pile wall is 90°, the I-shaped steel sheet pile is the second I-shaped steel sheet pile, and the angle between the I-shaped body of the second I-shaped steel sheet pile and the lock is 90°.

[0015] Furthermore, the angle between the U-shaped steel sheet pile and the I-shaped steel sheet pile on the inner side of the wall at the corner of the steel sheet pile wall is 135°, the I-shaped steel sheet pile is the third I-shaped steel sheet pile, and the angle between the I-shaped body of the first I-shaped steel sheet pile and the lock is 135°.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The utility model reduces the resistance of steel sheet pile sinking by setting the steel sheet pile wall in the sand pile wall, and protects the steel sheet piles during the excavation of the deep foundation pit by the sand pile wall, thereby avoiding damage to the steel plate structure.

[0018] 2. The utility model arranges a grouting layer at the back of the steel sheet pile wall, thereby strengthening the rigidity of the steel sheet pile and reducing deformation and seepage. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A top view of a temporary support device for a deep foundation pit according to Embodiment 1 of the utility model;

[0020] Figure 2 A three-dimensional diagram of a temporary support device for a deep foundation pit according to Embodiment 1 of the utility model;

[0021] Figure 3This is a plan view of a temporary support device for a deep foundation pit according to Example 3 of the utility model, in which the turning angle of the steel sheet pile wall is 45°;

[0022] Figure 4 This is a three-dimensional diagram of a temporary support device for a deep foundation pit according to Embodiment 3 of the utility model, wherein the turning angle of the steel sheet pile wall is 90°;

[0023] Figure 5 This is a top view of a temporary support device for a deep foundation pit according to Example 3 of the utility model, wherein the turning angle of the steel sheet pile wall is 90°;

[0024] Figure 6 This is a three-dimensional diagram of a temporary support device for a deep foundation pit according to Example 3 of the utility model, in which the turning angle of the steel sheet pile wall is 135°;

[0025] Figure 7 This is a top view of a temporary support device for a deep foundation pit according to Example 3 of the utility model, and the rotation angle of the steel sheet pile wall is 135°.

[0026] Reference numerals:

[0027] 1-first sand pile; 2-U-shaped steel sheet pile; 3-locking buckle; 4-second sand pile; 5-first straight steel sheet pile; 6-second straight steel sheet pile; 7-third straight steel sheet pile. DETAILED DESCRIPTION

[0028] The technical solution of the utility model will be clearly described below in conjunction with the accompanying drawings. Obviously, the described embodiments are not all embodiments of the utility model. All other embodiments obtained by ordinary technicians in this field without making creative work are within the protection scope of the utility model.

[0029] It should be noted that the terms "center", "up", "down", "horizontal", "left", "right", "front", "back", "lateral", "longitudinal", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the utility model and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] Example 1

[0031] The existing foundation pit support is 30m wide and 700m long. The deepest depth of the foundation pit excavation is 12m. The depth from the completed building to the required pouring of the completed building is 6m. The deep foundation pit near the building has the original support structure around it. After excavation to 6m, it belongs to the geologically hard sand and gravel layer. If the steel sheet piles are directly driven, it is easy to cause damage. If other supports (ground-connected walls, pile rows, etc.) are used, the construction cost is high and the construction period is long.

[0032] To this end, the utility model proposes a new technical solution: using steel sheet piles, while using drilling holes, backfilling sand and gravel, in order to ensure that it will not produce compaction due to geology, four holes are drilled and four are backfilled before constructing steel sheet piles, using the compaction effect of the front section of the soil layer to tighten the steel plate to ensure the water-stopping property of the steel sheet piles, because some steel sheet piles are close to the river channel, grouting is required on the back. The following is a detailed introduction.

[0033] Combination Figure 1 , Figure 2 As shown, this embodiment provides a temporary supporting device for a deep foundation pit, including a sand pile wall and a steel sheet pile wall, wherein the steel sheet pile wall is arranged in the sand pile wall.

[0034] The sand pile wall is composed of a plurality of first sand piles 1 arranged at equal intervals and arranged in a row.

[0035] The filler of the first sand pile 1 is a loose sand layer, and the specific material is sand and gravel.

[0036] The steel sheet pile wall is composed of a plurality of steel sheet piles connected in a row, and a steel sheet pile is arranged in the middle of each first sand pile 1 .

[0037] The steel sheet piles include U-shaped steel sheet piles 2, which are known materials in the prior art.

[0038] Locking buckles 3 are provided at both ends of the U-shaped steel sheet piles 2, and a plurality of U-shaped steel sheet piles 2 are connected in sequence into a row through the locking buckles 3.

[0039] In this embodiment, the length a of the U-shaped steel sheet pile 2 is equal to 400 mm, and the center distance between adjacent first sand piles 1 is 400 mm, that is, the center distance between adjacent first sand piles 1 is equal to the length of the U-shaped steel sheet pile 2 .

[0040] The width b of the U-shaped steel sheet pile 2 is 100 mm, that is, the distance between the opening and the bottom of the U-shaped steel sheet pile.

[0041] The thickness of the U-shaped steel sheet pile 2 is 10.5 mm.

[0042] The depth c of the U-shaped steel sheet pile 2 ranges from 12m to 15m.

[0043] The diameter of the first sand pile 1 is 300 mm.

[0044] The depth d of the first sand pile 1 is 0.5m-1.0m deeper than the depth c of the steel sheet pile 2, that is, the depth d of the first sand pile 1 ranges from 12.5m to 16m. The depth d of the first sand pile 1 is deeper than the depth c of the U-shaped steel sheet pile 2, mainly considering the later drainage and the need to reserve grouting for the foundation in the later stage.

[0045] In this embodiment, where the steel sheet piles are close to the river channel, a grouting layer needs to be set on the back of the steel sheet piles; the steel sheet piles are relative to the excavation position of the deep foundation pit, where the suspended part of the steel sheet piles is the inner side, and the part where the steel sheet piles are connected to the soil is the back. By grouting the back of the steel sheet piles, the stiffness of the back of the steel sheet piles to the steel sheet piles is enhanced to reduce seepage.

[0046] The steel sheet pile wall of this embodiment is suitable for scenes where the thickness of the geological sand layer is less than 5m. Since the thickness of the soil layer is small and the resistance is also small, selecting the steel sheet pile wall can reduce the resistance effect.

[0047] The specific construction process is:

[0048] 1. Use a pile boring machine to drill several holes with a diameter of 300 mm. The drilling depth is 0.5 m to 1.0 m greater than the steel sheet pile depth, and the center spacing of the holes is 400 mm.

[0049] 2. Backfill the loose sand layer to form a first sand pile 1 to form a sand pile wall;

[0050] 2. Drive the steel sheet piles into the sand pile wall to form a steel sheet pile wall;

[0051] 3. Finally, excavate the soil to the foundation surface.

[0052] In order to ensure that the first sand pile 1 will not be compacted due to geological conditions, during construction, four holes are drilled and four holes are backfilled before constructing steel sheet piles. The compaction effect of the previous soil layer is used to tighten the steel sheet piles to ensure their water-stopping properties.

[0053] The utility model reduces the sinking resistance of the steel sheet pile by backfilling the loose sand layer through drilling holes, protects the steel sheet pile during excavation through the loose sand layer, provides a buffer area for the steel sheet pile, and avoids damage to the steel sheet pile by the excavator during excavation of the deep foundation pit.

[0054] Example 2

[0055] This embodiment provides a temporary support device for a deep foundation pit, which is different from the first embodiment in that:

[0056] In this embodiment, the length a of the U-shaped steel sheet pile 2 is 500 mm, and the center distance between adjacent first sand piles 1 is 500 mm.

[0057] The width b of the U-shaped steel sheet pile 2 is 200 mm.

[0058] The thickness of the U-shaped steel sheet pile 2 is 24.3 mm.

[0059] The diameter of the first sand pile 1 is 400 mm.

[0060] Compared with the temporary support device of Example 1, the steel plate of this embodiment has greater rigidity and the diameter of the first sand pile 1 is large, which can release the increased stress on the internal soil layer caused by external support construction, and is suitable for scenes with a geological layer thickness greater than 5m.

[0061] Example 3

[0062] This embodiment provides a temporary support device for a deep foundation pit, which is different from Embodiment 1 or Embodiment 2 in that:

[0063] The steel sheet pile wall has several corners, that is, in this embodiment, there is a situation where adjacent steel sheet piles 2 are not in a straight line.

[0064] The temporary supporting device for the deep foundation pit of this embodiment further includes a straight steel sheet pile and a second sand pile 4 arranged at the corner.

[0065] The straight steel sheet pile is arranged in the middle of the second sand pile 4, and the diameter of the second sand pile 4 is 150 mm-180 mm.

[0066] The I-shaped steel sheet pile consists of an I-shaped body and locks at both ends. The locks at both ends of the I-shaped steel sheet pile are respectively connected to the locks of the U-shaped steel sheet piles on both sides.

[0067] like Figure 3 As shown, when the corner of the steel sheet pile wall is 45°, that is, the angle between the U-shaped steel sheet pile 2 on the inner side of the wall at the corner of the steel sheet pile wall and the I-shaped steel sheet pile is 45°, at this time, the I-shaped steel sheet pile at the corner is the first I-shaped steel sheet pile 5, and the angle between the I-shaped body of the first I-shaped steel sheet pile 5 and the lock is 45°.

[0068] Combination Figure 4 , 5 As shown, when the corner of the steel sheet pile wall is 90°, that is, the angle between the U-shaped steel sheet pile 2 on the inner side of the wall at the corner of the steel sheet pile wall and the I-shaped steel sheet pile is 90°, at this time, the I-shaped steel sheet pile at the corner is the second I-shaped steel sheet pile 6, and the angle between the I-shaped body of the second I-shaped steel sheet pile 6 and the lock is 90°.

[0069] Combination Figure 6 , 7 As shown, when the corner of the steel sheet pile wall is 135°, that is, the angle between the U-shaped steel sheet pile 2 on the inner side of the wall at the corner of the steel sheet pile wall and the I-shaped steel sheet pile is 135°, at this time, the I-shaped steel sheet pile at the corner is the third I-shaped steel sheet pile 7, and the angle between the I-shaped body of the third I-shaped steel sheet pile 7 and the lock is 135°.

[0070] The above technical features constitute the best implementation example of the present utility model, which has strong adaptability and best implementation effect. Non-essential technical features can be added or reduced according to actual needs to meet the needs of different situations.

[0071] Finally, it should be noted that the above content is only used to illustrate the technical solution of the utility model, rather than to limit the protection scope of the utility model. Simple modifications or equivalent substitutions of the technical solution of the utility model by ordinary technicians in this field do not deviate from the essence and scope of the technical solution of the utility model.

Claims

1. A temporary support device for a deep foundation pit, characterized in that: It includes a sand pile wall and a steel sheet pile wall. The steel sheet pile wall is arranged in the sand pile wall. The sand pile wall is composed of a plurality of sand piles arranged at intervals. A steel sheet pile is arranged in each sand pile. A plurality of steel sheet piles are connected in sequence to form a steel sheet pile wall.

2. The temporary support device for deep foundation pit according to claim 1, characterized in that: The steel sheet piles include U-shaped steel sheet piles, both ends of which are provided with lock buckles, and a plurality of U-shaped steel sheet piles are connected in sequence by the lock buckles.

3. The temporary support device for deep foundation pit according to claim 1, characterized in that: A grouting layer is provided on the outer side of the steel sheet pile wall.

4. The temporary support device for deep foundation pit according to claim 2, characterized in that: The sand piles include a first sand pile; a U-shaped steel sheet pile is arranged in the middle of the first sand pile, the length of the U-shaped steel sheet pile is equal to 400 mm, and the length of the U-shaped steel sheet pile is equal to the center distance between adjacent first sand piles; the width of the U-shaped steel sheet pile is 100 mm, and the thickness of the U-shaped steel sheet pile is 10.5 mm; the diameter of the first sand pile is 300 mm.

5. The temporary support device for deep foundation pit according to claim 2, characterized in that: The sand piles include a first sand pile; a U-shaped steel sheet pile is arranged in the middle of the first sand pile, the length of the U-shaped steel sheet pile is 500 mm, and the length of the U-shaped steel sheet pile is equal to the center distance between adjacent first sand piles; the width of the U-shaped steel sheet pile is 200 mm, and the thickness of the U-shaped steel sheet pile is 24.3 mm; the diameter of the first sand pile is 400 mm.

6. The temporary support device for a deep foundation pit according to any one of claims 1 to 5, characterized in that: The depth of the steel sheet pile is 12m-15m, the bottom of the sand pile is located below the bottom of the steel sheet pile, and the distance between the bottom of the sand pile and the bottom of the steel sheet pile is 0.5m-1.0m.

7. The temporary support device for a deep foundation pit according to any one of claims 2 to 5, characterized in that: The temporary support device for the deep foundation pit also includes an I-shaped steel sheet pile and a second sand pile. The steel sheet pile wall has at least one corner. The I-shaped steel sheet pile is located at the corner of the steel sheet pile wall, and the I-shaped steel sheet pile is arranged in the middle of the second sand pile. The diameter of the second sand pile is 150mm-180mm. The I-shaped steel sheet pile consists of an I-shaped body and locks at both ends. The locks at both ends of the I-shaped steel sheet pile are respectively connected to the locks of the U-shaped steel sheet piles on both sides.

8. The temporary support device for deep foundation pit according to claim 7, characterized in that: The angle between the U-shaped steel sheet pile and the I-shaped steel sheet pile on the inner side of the wall at the corner of the steel sheet pile wall is 45°, the I-shaped steel sheet pile is the first I-shaped steel sheet pile, and the angle between the I-shaped body of the first I-shaped steel sheet pile and the lock is 45°.

9. The temporary support device for deep foundation pit according to claim 7, characterized in that: The angle between the U-shaped steel sheet pile and the I-shaped steel sheet pile on the inner side of the wall at the corner of the steel sheet pile wall is 90°, the I-shaped steel sheet pile is the second I-shaped steel sheet pile, and the angle between the I-shaped body of the second I-shaped steel sheet pile and the lock is 90°.

10. The temporary support device for deep foundation pit according to claim 7, characterized in that: The angle between the U-shaped steel sheet pile and the I-shaped steel sheet pile on the inner side of the wall at the corner of the steel sheet pile wall is 135°, the I-shaped steel sheet pile is the third I-shaped steel sheet pile, and the angle between the I-shaped body of the first I-shaped steel sheet pile and the lock is 135°.

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