A support structure for foundation pit excavation and use method thereof

Abstract

The present invention discloses a support structure for foundation pit excavation and a method of use, and belongs to the field of building construction technology. The support structure includes a column, a base plate and a waterproof component. The column is vertically inserted in the base plate, and a gap space is formed between the column and the base plate. A first annular steel plate is inserted in the base plate, and the inner edge of the first annular steel plate is located in the gap space. The waterproof component includes a steel pipe, a water stop plate and a second annular steel plate. The steel pipe is coaxially fixedly sleeved on the column, and the water stop plate is sleeved on the column. The water stop plate is located below the base plate, and the water stop plate is perpendicular to the column. The outer edge of the water stop plate protrudes out of the gap space, and the second annular steel plate is inserted in parallel in the water stop plate. The inner edge of the second annular steel plate and the outer peripheral wall of the steel pipe are vertically welded. The support structure for foundation pit excavation provided by the present invention can not only avoid the problem of water seepage of the base plate during the pouring process, but also solve the problem of water seepage at the connection of the base plate after the construction is completed.

Description

Technical Field

[0001] The present invention belongs to the technical field of building construction, and more specifically, relates to a supporting structure for foundation pit excavation and a use method thereof. Background Art

[0002] The foundation pit is a soil pit excavated according to the size requirements at the foundation design location. During the excavation process, it is necessary to arrange the support structure in the foundation pit in advance to support the soil and ensure the normal progress of subsequent construction. Therefore, the support structure can only be removed after the main body (including the bottom plate) in the foundation pit is completed.

[0003] In the related art, in order to improve the bearing capacity of the supporting structure, the supporting structure is gradually replaced by steel pipe columns with columns, and the columns are cast by reinforced concrete, which can greatly improve its bearing capacity.

[0004] However, the connection points between the columns and the foundation pit or between the columns and the base plate cast in the foundation pit at a later stage can be regarded as the contact between the new and old concrete (there is a difference in construction time), which makes it easy for water to seep into the base plate during the casting process (water seepage on the outer wall of the column) and at the base plate connection after the casting is completed, increasing the risk of engineering accidents. Summary of the invention

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a support structure for foundation pit excavation and a method of use, the purpose of which is to avoid the problem of water seepage in the bottom plate during and after the pouring process.

[0006] In a first aspect, the present invention provides a support structure for foundation pit excavation, the support structure comprising a column, a bottom plate and a waterproof assembly;

[0007] The column is vertically inserted in the bottom plate, a gap space is formed between the outer peripheral wall of the column and the inner peripheral wall of the bottom plate, the column and the bottom plate are both reinforced concrete structures, a first annular steel plate is inserted in the bottom plate, the first annular steel plate is perpendicular to the column, and the inner edge of the first annular steel plate is located in the gap space;

[0008] The waterproof assembly includes a steel pipe, a waterstop plate arranged at the bottom of the foundation pit, and a second annular steel plate. The steel pipe is coaxially fixed on the column, and the waterstop plate is sleeved on the column. The waterstop plate is located below the bottom plate and is perpendicular to the column. The outer edge of the waterstop plate protrudes out of the gap space, and the second annular steel plate is inserted in parallel in the waterstop plate. The inner edge of the second annular steel plate and the outer peripheral wall of the steel pipe are vertically welded.

[0009] Optionally, a plurality of anchor bolts are inserted into the steel pipe, and the plurality of anchor bolts are circumferentially spaced apart along the outer peripheral wall of the column to connect the column.

[0010] Optionally, the waterproof component further includes a first protective layer, which is laid below the water stop plate and sleeved on the outer peripheral wall of the column.

[0011] Optionally, the waterproof component further includes a waterproof layer, the inner edge of the waterproof layer is sandwiched between the water stop plate and the first protective layer, and the waterproof layer is sleeved on the outer peripheral wall of the column.

[0012] Optionally, the outer peripheral wall of the column is sleeved with an annular copper bar, and the waterproof layer is sandwiched between the annular copper bar and the outer peripheral wall of the column.

[0013] Optionally, an outer peripheral wall of the column is provided with an expansion rubber strip, and the expansion rubber strip is sandwiched between the waterproof layer and the second annular steel plate.

[0014] In a second aspect, the present invention provides a method for using a support structure for foundation pit excavation, the method being based on the support structure of the first aspect, and comprising:

[0015] Inserting the upright column vertically into the foundation pit;

[0016] Arranging the water stop plate on the outer peripheral wall of the column, and welding the steel pipe and the second annular steel plate on the water stop plate;

[0017] pouring the bottom plate on the water stop plate;

[0018] Disassembling the column above the water stop plate;

[0019] Concrete is poured in the gap space and the disassembly space to connect the concrete and the bottom plate through the first annular steel plate. The disassembly space is the space of the columns enclosed by the gap space in the horizontal direction.

[0020] Optionally, after removing the column above the water stop plate, the method of use further includes:

[0021] An interface agent is applied to the bottom surfaces of the gap space and the disassembly space.

[0022] The technical solution provided by the embodiment of the present invention has the following beneficial effects:

[0023] An embodiment of the present invention provides a support structure for foundation pit excavation. During the process of foundation pit excavation, vertical support can be provided to horizontal support members in the foundation pit through columns.

[0024] In the use process of the support structure, first, the column is vertically inserted into the foundation pit. Then, a water stop plate is arranged on the outer peripheral wall of the column, and a steel pipe and a second annular steel plate on the water stop plate are welded, so that water seepage of the outer peripheral wall of the column is avoided by connecting the steel pipe and the second annular steel plate in advance, and the infiltration of groundwater during the pouring of the bottom plate can be effectively prevented, so that the bottom plate can be poured smoothly.

[0025] Furthermore, the bottom plate is poured on the water stop plate. On this basis, the columns above the water stop plate are first dismantled. Finally, concrete is poured in the gap space and above the columns, so that the first annular steel plate can be used to stop the water between the bottom plate and the newly poured concrete, so as to avoid the problem of water seepage caused by groundwater infiltrating into the connection between the bottom plate and the concrete through the outer edge of the water stop plate, thereby avoiding the risk of engineering accidents at the connection of the bottom plate after the construction is completed.

[0026] That is to say, the supporting structure for foundation pit excavation provided by the present invention can not only avoid the problem of water seepage in the bottom plate during the pouring process, but also solve the problem of water seepage at the connection of the bottom plate after the construction is completed, thereby greatly reducing the risk of engineering accidents caused by water seepage in the foundation pit during and after the construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is a first structural schematic diagram of a support structure for foundation pit excavation provided by an embodiment of the present invention;

[0028] Figure 2 The embodiment of the present invention provides Figure 1 A partial enlarged view of the middle A area;

[0029] Figure 3 is a second structural schematic diagram of a support structure for foundation pit excavation provided by an embodiment of the present invention;

[0030] Figure 4 is a cross-sectional view of a second annular steel plate provided in an embodiment of the present invention;

[0031] Figure 5 It is a flow chart of a method for using a support structure for foundation pit excavation provided by an embodiment of the present invention.

[0032] The symbols in the figure mean the following:

[0033] 1. Column; 11. Annular copper strip; 12. Expansion rubber strip; 2. Bottom plate; 21. First annular steel plate; 3. Waterproof assembly; 31. Steel pipe; 311. Anchor bolt; 32. Waterstop plate; 33. Second annular steel plate; 34. First protective layer; 35. Waterproof layer; 36. Second protective layer; 4. Gap space; 5. Disassembly space; 6. Concrete; 100. Foundation pit. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0035] Figure 1 is a first structural schematic diagram of a support structure for foundation pit excavation provided by an embodiment of the present invention, such as Figure 1 As shown, the supporting structure includes a column 1, a base plate 2 and a waterproof component 3.

[0036] The column 1 is vertically inserted in the base plate 2, and a gap space 4 is formed between the outer peripheral wall of the column 1 and the inner peripheral wall of the base plate 2. The column 1 and the base plate 2 are both reinforced concrete structures. A first annular steel plate 21 is inserted in the base plate 2. The first annular steel plate 21 is perpendicular to the column 1, and the inner edge of the first annular steel plate 21 is located in the gap space 4.

[0037] Figure 2 The embodiment of the present invention provides Figure 1 A partial enlarged view of area A, such as Figure 2 As shown, the waterproof component 3 includes a steel pipe 31, a waterstop plate 32 arranged at the bottom of the foundation pit 100, and a second annular steel plate 33. The steel pipe 31 is coaxially fixed on the column 1, and the waterstop plate 32 is sleeved on the column 1. The waterstop plate 32 is located below the bottom plate 2, and the waterstop plate 32 is perpendicular to the column 1. The outer edge of the waterstop plate 32 protrudes out of the gap space 4, and the second annular steel plate 33 is inserted in parallel in the waterstop plate 32. The inner edge of the second annular steel plate 33 and the outer peripheral wall of the steel pipe 31 are vertically welded.

[0038] The embodiment of the present invention provides a support structure for foundation pit excavation. During the excavation of the foundation pit 100 , the columns 1 can provide vertical support for the horizontal support members in the foundation pit 100 .

[0039] Regarding the use process of the support structure, first, the column 1 is vertically inserted into the foundation pit 100. Then, a water stop plate 32 is arranged on the outer peripheral wall of the column 1, and the steel pipe 31 and the second annular steel plate 33 on the water stop plate 32 are welded, so that the outer peripheral wall of the column 1 is prevented from water seepage through the advance connection of the steel pipe 31 and the second annular steel plate 33, and the infiltration of groundwater during the casting of the bottom plate 2 can be effectively prevented, so that the bottom plate 2 can be cast smoothly.

[0040] Further, the bottom plate 2 is cast on the water stop plate 32. On this basis, the column 1 above the water stop plate 32 is first dismantled. Finally, concrete 6 is poured in the gap space 4 and above the column 1 (see Figure 3 ), so that the first annular steel plate 21 can be used to achieve water stopping between the base plate 2 and the newly poured concrete 6, preventing groundwater from seeping into the connection between the base plate 2 and the concrete 6 through the outer edge of the water stop plate 32 and causing water seepage problems, thereby avoiding the risk of engineering accidents at the connection of the base plate 2 after the construction is completed.

[0041] That is to say, the supporting structure for foundation pit excavation provided by the present invention can not only avoid the water seepage problem of the base plate 2 during the pouring process, but also solve the water seepage problem at the connection of the base plate 2 after the construction is completed, thereby greatly reducing the risk of engineering accidents caused by water seepage in the foundation pit 100 during and after the construction.

[0042] It is easy to understand that the first annular steel plate 21 and the second annular steel plate 33 can effectively prevent water seepage at the contact surface between the new and old concretes through their own steel structures. In addition, the first annular steel plate 21 can not only prevent water seepage between the bottom plate 2 and the concrete 6, but also further prevent water seepage between the water stop plate 32 and the column 1. Therefore, the first annular steel plate 21 has a secondary water stop effect on water seepage between the water stop plate 32 and the column 1.

[0043] Figure 4 is a cross-sectional view of a second annular steel plate provided in an embodiment of the present invention, such as Figure 4 As shown, a plurality of anchor bolts 311 are inserted into the steel pipe 31 , and the plurality of anchor bolts 311 are arranged at intervals along the circumferential direction of the outer wall of the column 1 to connect the column 1 .

[0044] In the above embodiment, the steel pipe 31 and the column 1 can be firmly connected by the anchor bolt 311 .

[0045] It should be noted that the steel pipe 31 can be pre-buried in advance, that is, the steel bars and the steel pipe 31 in the column 1 can be connected by the anchor bolts 311 when the column 1 is cast.

[0046] See again Figure 2 The waterproof component 3 also includes a first protective layer 34 , which is laid below the water stop plate 32 and is sleeved on the outer peripheral wall of the column 1 .

[0047] In the above embodiment, the first protective layer 34 protects the water stop plate 32 , thereby extending the service life of the water stop plate 32 .

[0048] Exemplarily, the first protective layer 34 may be plain concrete.

[0049] Optionally, the waterproof component 3 further includes a waterproof layer 35 , which is sandwiched between the water stop plate 32 and the first protective layer 34 , and is sleeved on the outer peripheral wall of the column 1 .

[0050] In the above embodiment, the waterproof layer 35 has a waterproof effect on the outer peripheral wall of the column 1, which can enhance water stopping.

[0051] Exemplarily, the inner edge of the waterproof layer 35 extends upward along the axial direction of the column 1 to enhance the waterproof effect.

[0052] Exemplarily, the waterproof layer 35 may be a waterproof roll.

[0053] Exemplarily, there is a second protective layer 36 between the waterproof layer 35 and the water stop plate 32, which plays a double protection role.

[0054] In this embodiment, the second protective layer 36 may be fine stone concrete.

[0055] In this embodiment, the outer peripheral wall of the column 1 is sleeved with an annular copper strip 11 , and the inner edge of the waterproof layer 35 is sandwiched between the annular copper strip 11 and the outer peripheral wall of the column 1 .

[0056] In the above embodiment, the annular copper strip 11 plays a role in fixing the waterproof layer 35 .

[0057] Exemplarily, the outer peripheral wall of the column 1 is provided with an expansion strip 12, which is sandwiched between the waterproof layer 35 and the second annular steel plate 33. The water absorption of the expansion strip 12 can prevent water seepage at the connection between the waterproof layer 35 and the second annular steel plate 33.

[0058] Figure 5 is a flow chart of a method for using a support structure for foundation pit excavation provided by an embodiment of the present invention, such as Figure 5 As shown, the method of use is based on the above-mentioned support structure, and the method of use includes:

[0059] S501 , vertically insert the column 1 into the foundation pit 100 .

[0060] S502 , arranging a water stop plate 32 on the outer peripheral wall of the column 1 , and welding the steel pipe 31 and the second annular steel plate 33 on the water stop plate 32 .

[0061] It should be noted that the water stop plate 32 can also be formed by pouring reinforced concrete. Therefore, the steel pipe 31 and the second annular steel plate 33 can be welded first, and then the water stop plate 32 can be poured on the second annular steel plate 33.

[0062] S503 , pouring the base plate 2 on the water stop plate 32 .

[0063] In the above embodiment, by welding the steel pipe 31 and the water stop plate 32 , it is possible to effectively prevent water from seeping upward from the outer peripheral wall of the column 1 , thereby avoiding affecting the pouring of the base plate 2 .

[0064] S504 , dismantle the column 1 above the water stop plate 32 .

[0065] S505 , applying an interface agent on the bottom surfaces of the gap space 4 and the disassembly space 5 .

[0066] In the above embodiment, the interface agent plays a waterproof role.

[0067] S506 , pouring concrete 6 in the gap space 4 and the disassembly space 5 , so as to connect the concrete 6 and the bottom plate 2 through the first annular steel plate 21 .

[0068] Step S506 , the disassembly space 5 is the space of the column 1 enclosed by the gap space 4 in the horizontal direction.

[0069] In the above embodiment, the first annular steel plate 21 can be used to achieve water stopping between the base plate 2 and the subsequently newly poured concrete 6, thereby preventing groundwater from seeping into the connection between the base plate 2 and the concrete 6 through the outer edge of the water stop plate 32 and causing water seepage problems, thereby avoiding the risk of engineering accidents at the connection of the base plate 2 after the construction is completed.

[0070] It should be noted that the top surface of the concrete 6 and the top surface of the bottom plate 2 are at the same height.

[0071] That is to say, the method for using the supporting structure for foundation pit excavation provided by the present invention can not only avoid the problem of water seepage in the bottom plate 2 during the pouring process, but also solve the problem of water seepage at the connection of the bottom plate 2 after the construction is completed, thereby greatly reducing the risk of engineering accidents caused by water seepage in the foundation pit 100 during and after the construction.

[0072] It will be easily understood by those skilled in the art that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A support structure for foundation pit excavation, characterized in that: The supporting structure comprises a column (1), a base plate (2) and a waterproof component (3); The column (1) is vertically inserted into the base plate (2); a gap space (4) is formed between the outer peripheral wall of the column (1) and the inner peripheral wall of the base plate (2); the column (1) and the base plate (2) are both reinforced concrete structures; a first annular steel plate (21) is inserted into the base plate (2); the first annular steel plate (21) is perpendicular to the column (1); and the inner edge of the first annular steel plate (21) is located in the gap space (4); The waterproof component (3) comprises a steel pipe (31), a water stop plate (32) arranged at the bottom of the foundation pit (100), and a second annular steel plate (33); the steel pipe (31) is coaxially fixed on the column (1); the water stop plate (32) is sleeved on the column (1); the water stop plate (32) is located below the bottom plate (2), and the water stop plate (32) is perpendicular to the column (1); the outer edge of the water stop plate (32) protrudes from the gap space (4); the second annular steel plate (33) is inserted in parallel into the water stop plate (32); the inner edge of the second annular steel plate (33) and the outer peripheral wall of the steel pipe (31) are vertically welded; and the steel pipe (31) is pre-buried on the column (1) in advance.

2. A supporting structure for foundation pit excavation according to claim 1, characterized in that: A plurality of anchor bolts (311) are inserted into the steel pipe (31), and the plurality of anchor bolts (311) are arranged at intervals in the circumferential direction along the outer peripheral wall of the column (1) to connect the column (1).

3. A supporting structure for foundation pit excavation according to claim 1, characterized in that: The waterproof component (3) further comprises a first protective layer (34), wherein the first protective layer (34) is laid below the water stop plate (32), and the first protective layer (34) is sleeved on the outer peripheral wall of the column (1).

4. A supporting structure for foundation pit excavation according to claim 3, characterized in that: The waterproof component (3) further comprises a waterproof layer (35), wherein the waterproof layer (35) is sandwiched between the water stop plate (32) and the first protective layer (34), and the waterproof layer (35) is sleeved on the outer peripheral wall of the column (1).

5. A supporting structure for foundation pit excavation according to claim 4, characterized in that: The outer peripheral wall of the column (1) is sleeved with an annular copper strip (11), and the inner edge of the waterproof layer (35) is sandwiched between the annular copper strip (11) and the outer peripheral wall of the column (1).

6. A supporting structure for foundation pit excavation according to claim 4, characterized in that: An expansion rubber strip (12) is sleeved on the outer peripheral wall of the column (1), and the expansion rubber strip (12) is sandwiched between the waterproof layer (35) and the second annular steel plate (33).

7. A method for using a support structure for foundation pit excavation, characterized in that: The method of use is based on the support structure of claim 1, and the method of use comprises: Inserting the upright column (1) vertically into the foundation pit (100); Arranging the water stop plate (32) on the outer peripheral wall of the column (1), and welding the steel pipe (31) and the second annular steel plate (33) on the water stop plate (32); Casting the bottom plate (2) on the water stop plate (32); Disassembling the column (1) above the water stop plate (32); Concrete (6) is poured in the gap space (4) and the disassembly space (5) to connect the concrete (6) and the base plate (2) via the first annular steel plate (21); the disassembly space (5) is the space of the column (1) enclosed by the gap space (4) in the horizontal direction.

8. The method for using a supporting structure for foundation pit excavation according to claim 7, characterized in that: After removing the column (1) above the water stop plate (32), the method of use further comprises: An interface agent is applied to the bottom surfaces of the gap space (4) and the disassembly space (5).

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