Deep foundation pit supporting structure and construction method thereof

Abstract

The application relates to a deep foundation pit supporting structure and a construction method thereof. The supporting structure comprises a plurality of supporting piles, reinforcing beams, supporting plates, first connecting members and interval columns. The supporting piles are uniformly distributed along the circumferential side of the deep foundation pit. A guide groove is formed in the side wall of the supporting pile close to the deep foundation pit along the axial direction. The reinforcing beams are sequentially connected in a head-tail mode to form a spiral reinforcing framework. The adjacent reinforcing beams are connected and fixed through the first connecting members. The end of the first connecting member away from the reinforcing beam is slidably connected in the guide groove. The interval column is slidably connected in the guide groove. The axial direction of the interval column is the same as that of the supporting pile. The interval column is located between the upper and lower adjacent first connecting members. The upper and lower sides of the side wall of the reinforcing beam are provided with mounting grooves along the path direction. The supporting plate is arranged between the upper and lower adjacent reinforcing beams. The supporting plate extends into the mounting groove and can slide along the mounting groove. The mounting groove penetrates the first connecting member. The application has the effects of facilitating installation and construction and shortening the construction period.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of foundation pit support, in particular to a deep foundation pit support structure and a construction method thereof. BACKGROUND

[0002] The deep foundation pit refers to a pit with a depth exceeding 5 meters, or a pit with a depth not exceeding 5 meters but with special complicated geological conditions, surrounding environment and underground pipelines. The deep foundation pit support refers to the measures for supporting, reinforcing and protecting the side wall of the deep foundation pit and the surrounding environment to ensure the safety of underground structure construction and the surrounding environment. A large number of underground structure buildings such as underground parking lots, basements, underground subway stations and underground civil air defense projects are gradually emerging, and the deep foundation pit construction project is gradually entering the glory. We must develop and improve the deep foundation pit construction project, which has important significance for guaranteeing the engineering quality and safety and completing the construction task economically.

[0003] At present, the methods for supporting the circular deep foundation pit include the composite soil nailing wall, the cement mixing pile forming the gravity type retaining wall, the enclosure pile combined with the horizontal support, the column and the ring beam. The methods of adopting the composite soil nailing wall or the cement mixing pile forming the gravity type retaining wall have complex construction, slow construction progress, high cost, difficult deformation control, influence on the engineering quality and the safety of the foundation pit, and limited bearing capacity due to the difficult deformation control when the excavation depth of the foundation pit is large. Therefore, the construction of the circular deep foundation pit is complex and slow. SUMMARY

[0004] In order to facilitate the installation and construction and shorten the construction period, the application provides a deep foundation pit support structure and a construction method thereof.

[0005] In the first aspect, the application provides a deep foundation pit support structure, which adopts the following technical scheme:

[0006] The deep foundation pit support structure comprises a plurality of support piles, reinforcing beams, support plates, first connecting pieces and spacing columns. The plurality of support piles are uniformly distributed along the side of the deep foundation pit. A guide groove is formed in the side wall of the support pile close to the inside of the deep foundation pit along the axial direction. The plurality of reinforcing beams are sequentially and end-to-end connected to form a spiral reinforcing framework. The adjacent reinforcing beams are connected and fixed through the first connecting pieces. The end of the first connecting piece away from the reinforcing beam is slidingly connected in the guide groove. The spacing column is slidingly connected in the guide groove. The axial direction of the spacing column is the same as that of the support pile. The spacing column is located between the upper and lower adjacent first connecting pieces. The upper and lower sides of the side wall of the reinforcing beam are provided with mounting grooves along the path direction. The support plate is arranged between the upper and lower adjacent reinforcing beams and extends into the mounting groove to be slidable along the mounting groove. The mounting groove penetrates the first connecting piece.

[0007] By adopting the technical scheme, when the deep foundation pit is excavated and constructed, the first ends and the second ends of the reinforcing beams are connected to form a spiral reinforcing framework, the distance between the upper and lower adjacent reinforcing beams of the spiral reinforcing framework is always the same through the action of the interval columns, the reinforcing framework is connected to the support piles through the first connectors, when the support plates are installed, the support plates can be slid into the reinforcing framework through the installation slots at the upper end of the reinforcing framework, and the support plates can be slid along the installation slots to the lower end of the reinforcing framework, so that the installation of the support plates is more convenient, and workers do not need to enter the deep foundation pit for installation. When the deep foundation pit is continuously excavated, the reinforcing framework continuously slides down on the support piles, and only the reinforcing beams and the support plates need to be connected at the upper part, so that the installation of the support structure can be completed in the process of continuous excavation of the deep foundation pit, only workers need to install at the top of the deep foundation pit, the efficiency of the deep foundation pit support construction is greatly improved, the construction period is shortened, and the safety during installation is improved.

[0008] Optionally, the first connector comprises a sliding block, a connecting block and a fixing bolt, the connecting block is provided with installation holes on opposite sides of the connecting block, the installation holes are matched with the end portions of the reinforcing beams, the sliding block is arranged on one side of the connecting block adjacent to the installation holes, the sliding block is slidably connected to the guide slot, the fixing bolt passes through the connecting block to fix the connecting block and the end portions of the reinforcing beams, and the installation slot penetrates the side wall of the connecting block.

[0009] By adopting the technical scheme, when the deep foundation pit is reinforced and constructed, the sliding block of the first connector is slid into the guide slot, the end portions of the adjacent reinforcing beams are inserted into the installation holes, and the splicing is completed through the fixing bolt, so that the reinforcing beams are spliced to form a spiral reinforcing framework, and the reinforcing framework and the support piles are slidably connected through the sliding block. During installation and construction, the installation can be continuously performed while the deep foundation pit is excavated, and the installation efficiency is improved.

[0010] Optionally, one end of the support plate is provided with a splicing strip along the length direction, and the end of the support plate away from the splicing strip is provided with a splicing slot matched with the splicing strip along the length direction.

[0011] By adopting the technical scheme, the splicing strip and the splicing slot are arranged on the support plate, the adjacent support plates are matched with each other through the splicing strip and the splicing slot during installation of the support plate, the connection of the support plates is more compact, and the installation strength of the support plates is improved.

[0012] Optionally, the support structure further comprises a support ring, the support ring is arranged at the lower end of the reinforcing framework, and a sealing plate is arranged between the support ring and the adjacent reinforcing beam above.

[0013] By adopting the technical scheme, the support ring is mounted at the lower end of the reinforcing framework, the support ring is not completely attached to the bottom of the deep foundation pit during the support of the deep foundation pit, and the plugging plate is used for reinforcing and plugging, so that the deep foundation pit support is more complete, and the support structure forms a complete support effect on the entire sidewall of the deep foundation pit.

[0014] Optionally, a second connecting piece is arranged between the reinforcing framework and the support ring, the second connecting piece is sleeved on the support ring, the second connecting piece is provided with a connecting hole matched with the end of the reinforcing beam, and the reinforcing beam and the second connecting piece are fixed by bolts.

[0015] By adopting the technical scheme, the second connecting piece is arranged to facilitate the connection between the reinforcing beam and the support ring, so that the reinforcing framework and the support ring are connected as a whole, and the support and reinforcement effect is further improved.

[0016] Optionally, the support ring comprises a plurality of arc-shaped beams, the plurality of arc-shaped beams are sequentially connected end to end, and the adjacent arc-shaped beams are connected by the first connecting piece.

[0017] By adopting the technical scheme, the support ring is composed of a plurality of arc-shaped beams, so that the support ring can be assembled, the installation of the support ring is more convenient, the construction intensity of the workers is reduced, and the support ring is convenient to disassemble and transport.

[0018] Optionally, an end of the support plate inserted into the mounting groove is embedded with a plurality of rollers, and the axial direction of the rollers is arranged along the radial direction of the deep foundation pit.

[0019] By adopting the technical scheme, the rollers are arranged on the support plate, during the installation of the support plate, the support plate needs to slide along the mounting groove to the bottom of the reinforcing framework, and then the support plate moves more smoothly under the action of the rollers, so that the installation of the support plate is more convenient.

[0020] Optionally, the support plate is hollow, and a plurality of reinforcing ribs are arranged in the support plate.

[0021] By adopting the technical scheme, the support plate is hollow to reduce the weight of the support plate, so that the support plate is lightweight and the construction intensity is reduced, and the reinforcing ribs are arranged in the support plate to improve the strength of the support plate while keeping the support plate lightweight.

[0022] In a second aspect, the application provides a deep foundation pit support construction method, which adopts the following technical scheme:

[0023] A deep foundation pit support construction method comprises the following steps:

[0024] S1: excavate the first layer of deep foundation pit according to the construction drawing, and then drive the supporting pile into the deep foundation pit;

[0025] S2: install the first connecting piece in the guide groove, and install the spacing column in the guide groove, connect and fix the reinforcing beam through the first connecting piece to form a spiral reinforcing framework;

[0026] S3: slide the supporting plate into the installation slot between the upper and lower adjacent reinforcing beams at the uppermost end of the reinforcing framework, so that the supporting plate slides to the lower end of the reinforcing framework between the upper and lower adjacent reinforcing beams;

[0027] S4: excavate the second layer of deep foundation pit, and after the excavation is completed, slide the entire reinforcing framework along the supporting pile downward, and continuously install the supporting plate into the installation slot;

[0028] S5: repeat the above steps to complete the supporting construction of the entire deep foundation pit.

[0029] Through the above technical scheme, during the construction of the deep foundation pit support, the supporting structure is installed through layer-by-layer excavation in the deep foundation pit; that is, after excavating one layer of deep foundation pit, the supporting structure is continuously installed on the supporting pile, so that the deep foundation pit excavation is completed at the same time as the deep foundation pit support, which greatly shortens the construction period, and the deep foundation pit support is installed at the top of the deep foundation pit, without the need for workers to enter the deep foundation pit for installation, thereby improving the safety of the deep foundation pit support construction.

[0030] In summary, the present application has at least one of the following beneficial technical effects:

[0031] 1. By providing the supporting pile and the spiral reinforcing framework composed of a plurality of reinforcing beams, the supporting plate is continuously slid along the installation slot to the lower end of the reinforcing framework, without the need for workers to enter the deep foundation pit for installation, so that the installation of the supporting plate is more convenient, and when continuously excavating the deep foundation pit, only the reinforcing beams and the supporting plate need to be continuously connected at the upper part, thereby shortening the construction period and improving the safety during installation of the support;

[0032] 2. By providing the supporting ring, the supporting ring is not completely attached to the bottom of the deep foundation pit, and the sealing plate is used for reinforcement and sealing, so that the entire deep foundation pit support is more complete, and the supporting structure forms a complete supporting effect on the entire side wall of the deep foundation pit;

[0033] 3. The construction method installs the supporting structure through layer-by-layer excavation of the deep foundation pit, so that the deep foundation pit excavation is completed at the same time as the deep foundation pit support, which greatly shortens the construction period. BRIEF DESCRIPTION OF DRAWINGS

[0034] Figure 1 is a structural schematic diagram of a deep foundation pit support structure according to an embodiment of the present application.

[0035] Figure 2 This is a three-dimensional sectional view of a deep foundation pit support structure according to an embodiment of this application.

[0036] Figure 3 yes Figure 2 An enlarged schematic diagram of part A in the middle.

[0037] Figure 4 This is a schematic diagram of the support plate in an embodiment of this application.

[0038] Figure 5 This is a three-dimensional sectional view of a deep foundation pit support structure according to an embodiment of this application.

[0039] Reference numerals: 1. Support pile; 11. Guide groove; 2. Reinforcing beam; 21. Mounting groove; 3. Support plate; 31. Insert strip; 32. Insert groove; 33. Roller; 34. Reinforcing rib; 4. First connector; 41. Sliding block; 42. Connecting block; 421. Mounting hole; 43. Fixing bolt; 5. Spacer column; 6. Reinforcing frame; 7. Support ring; 71. Curved beam; 8. Sealing plate; 9. Second connector; 91. Connecting hole. Detailed Implementation

[0040] The following is in conjunction with the appendix Figures 1-5 This application will be described in further detail.

[0041] This application discloses a deep foundation pit support structure. (Refer to...) Figure 1 , Figure 2 and Figure 3 The deep foundation pit support structure includes several support piles 1, reinforcing beams 2, support plates 3, first connectors 4, and spacer columns 5. The support piles 1 are evenly distributed along the perimeter of the deep foundation pit. Each support pile 1 is a precast round pile. A guide groove 11 is axially formed on the side wall of the support pile 1 closest to the inside of the deep foundation pit. The guide groove 11 has a T-shaped structure. Several reinforcing beams 2 are sequentially connected end-to-end to form a spiral reinforcing frame 6. Adjacent reinforcing beams 2 are connected and fixed by first connectors 4, with the end of the first connector 4 away from the reinforcing beam 2 slidably connected within the guide groove 11. The reinforcing frame 6 is connected to the support piles 1 by multiple first connectors 4, and the first connectors... Component 4 allows the entire reinforced frame 6 to slide along the guide groove 11; the first connecting component 4 includes a slider 41, a connecting block 42, and a fixing bolt 43. The connecting block 42 has mounting holes 421 on its opposite sides that are adapted to the ends of the reinforced beam 2. The slider 41 is integrally connected to one side of the connecting block 42 adjacent to the mounting hole 421. The slider 41 is adapted to the guide groove 11 and is slidably connected in the guide groove 11. The fixing bolt 43 passes through the connecting block 42 to fix the connecting block 42 to the ends of the reinforced beam 2. The mounting groove 21 penetrates the side wall of the connecting block 42. During installation, the installation can be carried out continuously while the deep foundation pit is being excavated, thus improving the installation efficiency.

[0042] Referring to Figure 1 , Figure 2 With Figure 3 , the spacer column 5 is slidingly connected in the guide groove 11, the axial direction of the spacer column 5 is the same as the axial direction of the support pile 1, and the spacer column 5 is located between the upper and lower adjacent first connecting pieces 4. The spacer column 5 separates the upper and lower first connecting pieces 4, and the distance between the adjacent first connecting pieces 4 on the same support pile 1 is the same. The upper and lower sides of the side wall of the reinforcing beam 2 are provided with mounting grooves 21 along the path direction. The support plate 3 is installed between the upper and lower adjacent reinforcing beams 2, and the support plate 3 extends into the mounting groove 21 and can slide along the mounting groove 21. The mounting groove 21 penetrates the first connecting piece 4, so that the mounting grooves 21 on the adjacent reinforcing beams 2 are communicated, and the support plate 3 can slide along the mounting groove 21 into the mounting groove 21 on the adjacent connecting reinforcing beam 2, so that the support plate 3 can slide along the mounting groove 21 to the lower end of the reinforcing framework 6. It is not necessary for workers to enter the deep foundation pit for installation, so that the installation of the support plate 3 is more convenient.

[0043] Referring to Figure 4 , one end of the support plate 3 is integrally connected with a plug-in strip 31 along the side length direction, and the other end of the support plate away from the plug-in strip 31 is provided with a plug-in groove 32 matched with the plug-in strip 31 along the side length direction. When the support plate 3 is installed, the adjacent support plates 3 are matched with each other through the plug-in strip 31 and the plug-in groove 32, so that the connection of the support plate 3 is more compact, and the installation strength of the support plate 3 is improved. The end of the support plate 3 extending into the mounting groove 21 is embedded with a plurality of rollers 33, and the axial direction of the roller 33 is arranged along the radial direction of the deep foundation pit. Under the action of the roller 33, the support plate 3 moves more smoothly, and the installation of the support plate 3 is more convenient. The support plate 3 is hollow, and the support plate 3 is provided with a plurality of reinforcing ribs 34. The hollow structure reduces the weight of the support plate 3 and makes it lightweight. The reinforcing ribs 34 improve the strength of the support plate 3 while keeping it lightweight.

[0044] Referring to Figure 5The supporting structure further comprises a support ring 7, the lower end of the support ring 7 is provided with the reinforced framework 6, the upper and lower sides of the support ring 7 are both provided with a fixing groove in the circumferential direction, the support ring 7 is provided with a blocking plate 8 between the support ring 7 and the adjacent reinforced beam 2 above, and the blocking plate 8 is an arc-shaped plate. A second connecting piece 9 is arranged between the reinforced framework 6 and the support ring 7, the second connecting piece 9 is sleeved on the support ring 7, the second connecting piece 9 is provided with a connecting hole 91 matched with the end of the reinforced beam 2, and the reinforced beam 2 and the second connecting piece 9 are fixed through bolts. The second connecting piece 9 facilitates the connection between the reinforced beam 2 and the support ring 7, the reinforced framework 6 and the support ring 7 are connected as a whole, and the supporting and reinforcing effect is further improved. The support ring 7 comprises a plurality of arc-shaped beams 71, the arc-shaped beams 71 are sequentially connected end to end, the adjacent arc-shaped beams 71 are connected through the first connecting piece 4, the support ring 7 can be assembled, and the installation of the support ring 7 is more convenient.

[0045] The implementation principle of the deep foundation pit supporting structure in the embodiment of the application is as follows: when the deep foundation pit is excavated and supported, the support pile 1 is fixed, the support ring 7 and the reinforced beam 2 are assembled and fixed through the first connecting piece 4 and the second connecting piece 9, the spiral reinforced framework 6 is formed, the support plate 3 is installed in the mounting groove 21 of the uppermost reinforced beam 2, the support plate 3 is slid downward along the mounting groove 21, the lowermost end of the reinforced framework 6 is slid, and the support plate 3 and the blocking plate 8 are sequentially installed, so that the supporting effect of the deep foundation pit side wall is achieved; only the staff needs to install at the top of the deep foundation pit, the efficiency of the deep foundation pit supporting construction is greatly improved, the construction period is shortened, and the safety during installation is improved.

[0046] The embodiment of the application further discloses a deep foundation pit supporting construction method, referring to Figure 1 and Figure 2 The deep foundation pit supporting structure is used, and the method comprises the following steps.

[0047] S1: according to the construction drawing, a first layer of deep foundation pit is excavated, then the support pile 1 is driven into the deep foundation pit, and the plurality of support piles 1 are uniformly distributed along the circumferential direction of the deep foundation pit;

[0048] S2: the first connecting piece 4 is installed in the guide groove 11, the spacing column 5 is installed in the guide groove 11, the reinforced beam 2 is connected and fixed through the first connecting piece 4 to form the spiral reinforced framework 6, and the support ring 7 is installed and connected with the reinforced framework 6;

[0049] S3: the support plate 3 is slid into the mounting groove 21 between the upper and lower adjacent reinforced beams 2 of the uppermost end of the reinforced framework 6, the support plate 3 is slid to the lower end of the reinforced framework 6 between the upper and lower adjacent reinforced beams 2, and the blocking plate 8 is installed;

[0050] S4: then excavate the second layer of deep foundation pit, after the excavation is completed, the whole reinforcing framework 6 is slid along the support pile 1 downwards, and the reinforcing beam 2 is continuously installed on the upper end of the reinforcing framework 6, and the supporting plate 3 is continuously installed into the installation groove 21;

[0051] S5: repeat the above steps, install the support while excavating, and the support construction of the whole deep foundation pit is completed.

[0052] The above are preferred embodiments of the present application, and are not intended to limit the protection scope of the present application, so: any equivalent changes made according to the structure, shape, principle of the present application should be covered within the protection scope of the present application.

Claims

1. A deep foundation pit support structure, characterized in that: The structure includes several support piles (1), reinforcing beams (2), support plates (3), a first connector (4), and spacer columns (5). The support piles (1) are evenly distributed along the perimeter of the deep foundation pit. A guide groove (11) is axially formed on the side wall of each support pile (1) closest to the deep foundation pit. Several reinforcing beams (2) are sequentially connected end-to-end to form a spiral reinforcing skeleton (6). Adjacent reinforcing beams (2) are connected and fixed by the first connector (4), with the end of the first connector (4) away from the reinforcing beam (2) slidably connected within the guide groove (11). The spacer column (5) is slidably connected to the guide groove (11). The axial direction of the spacer column (5) is the same as that of the support pile (1). The spacer column (5) is located between the upper and lower adjacent first connectors (4). The upper and lower sides of the side wall of the reinforcing beam (2) are provided with mounting grooves (21) along the path direction. The support plate (3) is provided between the upper and lower adjacent reinforcing beams (2). The support plate (3) extends into the mounting groove (21) and can slide along the mounting groove (21). The mounting groove (21) is provided through the first connector (4). The first connector (4) includes a slider (41), a connecting block (42), and a fixing bolt (43). The connecting block (42) has mounting holes (421) on its opposite sides that are adapted to the end of the reinforcing beam (2). The slider (41) is located on the side of the connecting block (42) adjacent to the mounting hole (421). The slider (41) is slidably connected in the guide groove (11). The fixing bolt (43) passes through the connecting block (42) to fix the connecting block (42) to the end of the reinforcing beam (2). The mounting groove (21) passes through the side wall of the connecting block (42). The support structure also includes a support ring (7), which is located at the lower end of the reinforcing frame (6), and a sealing plate (8) is provided between the support ring (7) and the adjacent reinforcing beam (2) above. A second connector (9) is provided between the reinforcing frame (6) and the support ring (7). The second connector (9) is sleeved on the support ring (7). The second connector (9) is provided with a connecting hole (91) that matches the end of the reinforcing beam (2). The reinforcing beam (2) and the second connector (9) are fixed together by bolts. The support ring (7) includes multiple arc-shaped beams (71), which are connected end to end in sequence, and adjacent arc-shaped beams (71) are connected by the first connector (4).

2. The deep foundation pit support structure according to claim 1, characterized in that: One end of the support plate (3) is provided with a plug strip (31) along the side length direction, and the other end of the support plate (3) away from the plug strip (31) is provided with a plug groove (32) that is compatible with the plug strip (31) along the side length direction.

3. The deep foundation pit support structure according to claim 1, characterized in that: The end of the support plate (3) that extends into the mounting groove (21) is fitted with several rollers (33), and the axial direction of the rollers (33) is arranged along the radial direction of the deep foundation pit.

4. The deep foundation pit support structure according to claim 1, characterized in that: The support plate (3) is hollow and has a number of reinforcing ribs (34) inside.

5. A method for constructing deep foundation pit support, characterized in that: The deep foundation pit support structure as described in any one of claims 1-4 includes the following steps: S1: Excavate the first deep foundation pit according to the construction drawings, and then drive the support piles (1) into the deep foundation pit; S2: Install the first connector (4) in the guide groove (11) and install the spacer (5) in the guide groove (11). Connect and fix the reinforcing beam (2) through the first connector (4) to form a spiral reinforcing skeleton (6). S3: Slide the support plate (3) into the mounting groove (21) between the uppermost and lower adjacent reinforcing beams (2) of the reinforcing frame (6), so that the support plate (3) slides to the lower end of the reinforcing frame (6) between the uppermost and lower adjacent reinforcing beams (2); S4: Excavate the second deep foundation pit. After the excavation is completed, slide the entire reinforced frame (6) down along the support pile (1), and continue to install the reinforced beam (2) at the upper end of the reinforced frame (6), and continue to install the support plate (3) into the installation groove (21). S5: Repeat the above steps to complete the support construction of the entire deep foundation pit.

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