A foundation pit pile support device and method

Abstract

The present application discloses a foundation pit pile support device and method, and relates to the technical field of foundation pit construction. The foundation pit pile support device comprises a plurality of pile rows arranged at intervals, wherein the pile rows comprise support sections and embedded sections arranged from top to bottom, a horizontal rotating shaft is connected between two adjacent support sections, and a rotating rod is rotatably connected to the horizontal rotating shaft; the two ends of the rotating rod can be rotated to the two sides of the pile row respectively, and the rotating rod is located above one side of the pile row and is connected to a support member for contacting the pile row; a blocking member located above the horizontal rotating shaft is connected between two adjacent support sections, and a drainage port is formed between two adjacent support sections and below the horizontal rotating shaft. The present application can form an unloading platform during support, disperse and transfer part of the lateral soil pressure, reduce the lateral force on the entire support device, effectively weaken the influence of the lateral soil pressure on the entire support device, and thus enhance the support performance of the entire support device.

Description

Technical Field

[0001] The present application relates to the technical field of foundation pit construction, and in particular to a foundation pit pile support device and method. Background Art

[0002] The foundation pit support device is an indispensable and important part of the construction project, especially in the construction process of high-rise buildings and underground projects. Its main function is to effectively support and protect the side walls of the foundation pit and the surrounding environment during the foundation pit excavation process to prevent the occurrence of safety accidents such as foundation pit collapse and collapse, ensure the safety of construction workers, and ensure the smooth progress of the project construction.

[0003] At present, common foundation pit support devices mainly include support retaining structure, anchor retaining structure, cantilever retaining structure, soil nail wall support and gravity retaining wall support, etc. In actual application, these foundation pit support devices use their own methods to resist the lateral force generated by the soil and ensure the stability of the side wall of the foundation pit, thereby providing a safe working space for construction activities in the foundation pit and ensuring the safety of construction personnel and equipment.

[0004] However, the existing foundation pit support devices have the following deficiencies: 1. The support capacity of the existing foundation pit support devices mainly depends on the strength of the device itself, and the potential for interaction between the device and the soil is not fully explored, resulting in poor support effects. 2. The foundation pit support device and the drainage system in the foundation pit project are usually constructed independently. When encountering heavy rain or a failure in the drainage system, the foundation pit is very likely to become unstable and other dangerous conditions; for example, when excavating deep foundation pits in soft soil areas, if drainage is not timely, it is easy to cause soil slippage and foundation pit instability. Summary of the invention

[0005] The purpose of the present application is to provide a foundation pit pile support device and method to solve the problem of poor support effect of existing foundation pit support devices.

[0006] The technical solution adopted by this application to solve its technical problem is:

[0007] In a first aspect, a foundation pit pile support device is provided, comprising a plurality of pile rows arranged at intervals, wherein the pile rows comprise support sections and pre-embedded sections arranged from top to bottom, a horizontal rotating shaft is connected between two adjacent support sections, and a rotating rod is rotatably connected to the horizontal rotating shaft;

[0008] The two ends of the rotating rod can be rotated to the two sides of the pile row respectively, and the rotating rod is located above one side of the pile row and is connected with a support member for contacting with the pile row;

[0009] A blocking piece located above the horizontal rotating shaft is connected between two adjacent supporting sections, and a drainage outlet is formed between the two adjacent supporting sections and below the horizontal rotating shaft.

[0010] Furthermore, when the rotating rod is rotated to a horizontal state, the supporting member abuts against the pile row.

[0011] Furthermore, the support member includes two support rods, one end of the two support rods is connected to the rotating rod, and the other ends of the two support rods are respectively used to abut against two adjacent pile rows.

[0012] Furthermore, when the support rod abuts against the pile row, the support rod is inclined toward the pile row from bottom to top.

[0013] Furthermore, the rotating rod is provided with two fixing holes, and one end of the two supporting rods is respectively fixed in the two fixing holes.

[0014] Furthermore, a steel mesh covering the drain outlet is connected between two adjacent support sections.

[0015] Furthermore, the blocking member and the supporting member are located on the same side of the horizontal rotation axis.

[0016] In a second aspect, a foundation pit pile support method is provided, using the foundation pit pile support device provided in the first aspect, the method comprising:

[0017] S1. Assemble the pile row, horizontal rotating shaft, rotating rod and plugging member in the foundation pit pile support device; wherein the rotating rod is arranged vertically; sink the assembled structure into a preset position in the stratum;

[0018] S2. Excavate the foundation pit until the bottom of the foundation pit is flush with the lower end of the rotating rod; control the rotating rod to rotate to a horizontal state, fix the support member above the rotating rod, and make the support member abut against the pile row.

[0019] Furthermore, in step S2, after the rotating rod is rotated to a horizontal state, gravel is filled in the stratum and around the rotating rod.

[0020] Furthermore, in step S2, after the support member is installed, a steel mesh located below the horizontal rotation axis is installed between two adjacent support sections.

[0021] Beneficial effects of this application:

[0022] 1. The foundation pit pile support device provided in the embodiment of the present application is provided with a horizontal rotating shaft between the supporting sections of adjacent pile rows, and a rotating rod is rotatably connected on the horizontal rotating shaft. The two ends of the rotating rod can be respectively rotated to the two sides of the pile row, and a support member for contacting with the pile row is connected to the upper part of one side of the pile row. When the embedded section of the pile row is sunk into the soil layer and the supporting section is used to support the side wall of the foundation pit, one end of the rotating rod can be rotated to probe into the soil layer of the side wall of the foundation pit, and the support member fixed on the other end of the rotating rod can be contacted with the pile row, thereby forming an unloading platform, which can partially The lateral earth pressure is dispersed and transferred, reducing the lateral force on the entire support device, and effectively weakening the influence of the lateral earth pressure on the entire support device; at the same time, the gravity of the soil above the rotating rod will produce a downward torque on the rotating rod, which is converted into an upward torque on the support member through the lever principle of the rotating rod, and then the support member is used to generate a thrust on the pile row, so that the pile row produces a reverse thrust on the soil layer on the side wall of the foundation pit, thereby enhancing the support performance of the entire support device, and solving the problem of poor support effect caused by weak interaction between the existing foundation pit support device and the soil.

[0023] 2. The foundation pit pile support device provided in the embodiment of the present application realizes effective integration of the foundation pit support structure and the drainage system by forming a drain outlet between two adjacent support sections and below the horizontal rotation axis. Water in the soil layer on the side wall of the foundation pit can be discharged through the drain outlet, thereby avoiding soil slippage and foundation pit instability due to untimely drainage, thereby improving the overall stability of the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a structural schematic diagram of a foundation pit pile support device provided in an embodiment of the present application;

[0026] Figure 2 yes Figure 1 Sectional view along line BB;

[0027] Figure 3 It is a structural schematic diagram of assembling a pile row, a horizontal rotating shaft, a rotating rod and a plugging piece and sinking them into a preset position in the stratum;

[0028] Figure 4 yes Figure 3 Sectional view along line CC;

[0029] Figure 5It is a schematic diagram of the structure after the support and the steel mesh are assembled;

[0030] Figure 6 yes Figure 5 Cross-sectional view along line DD.

[0031] Reference numerals:

[0032] 10-pile row;

[0033] 101-support section;

[0034] 102-embedded section;

[0035] 11- horizontal rotation axis;

[0036] 12- Rotating rod;

[0037] 121-fixing hole;

[0038] 13- support member;

[0039] 131- support rod;

[0040] 14- blocking piece;

[0041] 15- Drainage outlet;

[0042] 16- Steel mesh;

[0043] 17- Gravel. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0045] In the description of this application, the terms "upper", "lower", "left", "right", "front", "back", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on this application. Unless otherwise specified, the above-mentioned directional descriptions can be flexibly set in the process of actual application under the condition that the relative positional relationship shown in the accompanying drawings is satisfied.

[0046] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0047] See also Figure 1 , Figure 2 The embodiment of the present application provides a foundation pit pile support device, including a plurality of pile rows 10 arranged at intervals, the pile row 10 including support segments 101 and embedded segments 102 arranged from top to bottom, a horizontal rotation shaft 11 is connected between two adjacent support segments 101, and a rotating rod 12 is rotatably connected to the horizontal rotation shaft 11; the two ends of the rotating rod 12 can be rotated to the two sides of the pile row 10 respectively, and the rotating rod 12 is located above one side of the pile row 10 and is connected to a support member 13 for abutting against the pile row 10; a blocking member 14 located above the horizontal rotation shaft 11 is connected between two adjacent support segments 101, and a drainage outlet 15 is formed between two adjacent support segments 101 and below the horizontal rotation shaft 11.

[0048] See also Figure 1 The pile row 10 is a continuous support wall formed by a plurality of pipe piles arranged side by side and connected together, which is used to support the side wall of the foundation pit and prevent soil collapse. The pipe piles may include reinforced concrete cast-in-place piles, artificially dug piles, precast concrete sheet piles and steel sheet piles. Exemplarily, each pile row 10 may include three interconnected pipe piles. Of course, each pile row 10 may also include four or more interconnected pipe piles, which is not specifically limited here.

[0049] See also Figure 1 , Figure 2 The pile row 10 is arranged vertically, including a supporting section 101 and a pre-embedded section 102 arranged in sequence from top to bottom. Figure 1 , Figure 2 In the figure, the part above the AA' line is the support section 101, and the part below the AA' line is the embedded section 102. The support section 101 is used to be exposed in the foundation pit and close to the side wall of the foundation pit to support the side wall of the foundation pit; the embedded section 102 is used to be inserted downward into the soil layer below the base of the foundation pit to fix the pile row 10. By arranging a plurality of pile rows 10 along the circumference of the foundation pit, the side wall of the foundation pit is supported. To simplify the view, Figure 1 Only two pile rows 10 are shown.

[0050] See also Figure 1, any two adjacent pile rows 10 are spaced apart and form an installation gap between them. The horizontal rotation shaft 11 is horizontally arranged in the installation gap, and the two ends of the horizontal rotation shaft 11 are respectively fixedly connected to the two adjacent support segments 101. The rotating rod 12 is perpendicular to the horizontal rotation shaft 11 and is rotationally connected to the horizontal rotation shaft 11, so that the rotating rod 12 can rotate around the horizontal rotation shaft 11. Among them, the two ends of the rotating rod 12 are located on both sides of the horizontal rotation shaft 11, and the distances from the two ends of the rotating rod 12 to the horizontal rotation shaft 11 are consistent.

[0051] See also Figure 2 The left side of the pile row 10 is the inner cavity of the foundation pit, referred to as the foundation pit side; the right side of the pile row 10 is the side wall soil layer of the foundation pit, referred to as the soil layer side; when the rotating rod 12 rotates around the horizontal rotation axis 11, the two ends of the rotating rod 12 can rotate to the foundation pit side and the soil layer side respectively. The support member 13 is arranged on the foundation pit side and is located above the rotating rod 12; the support member 13 is fixedly connected to the rotating rod 12 and is used to abut against the surface of the pile row 10 located on the foundation pit side. Exemplarily, when the rotating rod 12 rotates to a horizontal state, the support member 13 abuts against the pile row 10.

[0052] See also Figure 1 , Figure 2 , the blocking member 14 is connected between two adjacent support segments 101, and extends downward from the upper end of the support segment 101 to the position of the horizontal rotation axis 11, playing the role of blocking the upper soil of the foundation pit. Among them, the blocking member 14 can be a pipe pile structure. The blocking member 14 can also be a blocking plate made of steel plate. Exemplarily, the blocking member 14 and the support member 13 are located on the same side of the horizontal rotation axis 11. For example, the blocking member 14 and the support member 13 are both arranged on the foundation pit side of the horizontal rotation axis 11. When the rotating rod 12 is rotated to a vertical state, the rotating rod 12 can be completely accommodated in the gap between two adjacent support segments 101. When the rotating rod 12 is in a vertical state, the lower end of the rotating rod 12 can be flush with the AA' line.

[0053] See also Figure 1 , Figure 2 The installation gap between two adjacent support sections 101 and below the horizontal rotation axis 11 forms a drainage port 15, and the water in the soil layer of the side wall of the foundation pit can be drained by the drainage port 15 without the need to set up an additional drainage system.

[0054] The foundation pit pile support device provided by the embodiment of the present application is provided with a horizontal rotation shaft 11 between the support sections 101 of adjacent pile rows, and a rotating rod 12 is rotatably connected on the horizontal rotation shaft 11, and the two ends of the rotating rod 12 can be respectively rotated to the two sides of the pile row 10, and a support member 13 for contacting with the pile row 10 is connected to the upper part of one side of the pile row 10; when the embedded section 102 of the pile row 10 is sunk into the soil layer and the support section 101 is used to support the side wall of the foundation pit, one end of the rotating rod 12 can be rotated to probe into the soil layer of the side wall of the foundation pit, and the support member 13 fixed on the other end of the rotating rod 12 can contact with the pile row 10, thereby An unloading platform is formed to disperse and transfer part of the lateral earth pressure, reduce the lateral force on the support device as a whole, and effectively weaken the influence of the lateral earth pressure on the entire support device; at the same time, the gravity of the soil above the rotating rod 12 will produce a downward torque on the rotating rod 12, and the torque is converted into an upward torque on the support member 13 through the lever principle of the rotating rod 12, and then the support member 13 is used to generate a thrust on the pile row 10, so that the pile row 10 generates a reverse thrust on the soil layer of the side wall of the foundation pit, thereby enhancing the support performance of the entire support device, and solving the problem of poor support effect caused by weak interaction between the existing foundation pit support device and the soil.

[0055] The foundation pit pile support device provided in the embodiment of the present application realizes effective integration of the foundation pit support structure and the drainage system by forming a drain outlet 15 between two adjacent support sections 101 and below the horizontal rotation axis 11. Water in the soil layer of the side wall of the foundation pit can be discharged through the drain outlet 15, thereby avoiding soil slippage and foundation pit instability caused by untimely drainage, thereby improving the overall stability of the foundation pit.

[0056] The support member 13 may be a support block, a support plate, or other structure connected to the rotating rod 12. Figure 1 , Figure 2 The support member 13 includes two support rods 131, one end of each of the two support rods 131 is connected to the rotating rod 12, and the other ends of each of the two support rods 131 are respectively used to abut against two adjacent pile rows 10. Accordingly, the two support rods 131 abut against the two pile rows 10 respectively, and can provide support force for the two pile rows 10 at the same time, effectively resisting the lateral pressure of the soil.

[0057] For example, see Figure 2 When the support rod 131 contacts the pile row 10, the support rod 131 is inclined from bottom to top toward the pile row 10. Accordingly, the inclined support rod 131 can better utilize the lateral pressure of the soil, provide more stable support, and at the same time increase the anti-overturning capacity of the entire support device and improve the reliability of the support.

[0058] The support rod 131 and the rotating rod 12 can be connected by welding or bolts. Figure 2 The rotating rod 12 is provided with two fixing holes 121 , and one end of the two supporting rods 131 is fixed in the two fixing holes 121 respectively.

[0059] Accordingly, the design of the fixing hole 121 makes the installation and adjustment of the support rod 131 more convenient, and the construction personnel can quickly insert the support rod 131 into the fixing hole 121 to achieve the connection between the support rod 131 and the rotating rod 12.

[0060] In some embodiments, see Figure 1 A steel mesh 16 covering the drain outlet 15 is connected between two adjacent support sections 101. Accordingly, the steel mesh 16 covers the drain outlet 15, which can effectively prevent the gravel from being discharged from the drain outlet, and also provides additional support force, enhancing the bearing capacity of the support device, so that it can withstand greater soil pressure.

[0061] See also Figure 3 , Figure 4 , Figure 5 , Figure 6 The embodiment of the present application provides a foundation pit pile support method, using a foundation pit pile support device, the method comprising:

[0062] S1, assemble the pile row 10, the horizontal shaft 11, the rotating rod 12 and the blocking member 14 in the foundation pit pile support device; wherein the rotating rod 12 is arranged vertically; sink the assembled structure into a preset position in the stratum, such as Figure 3 , Figure 4 shown.

[0063] S2, excavate the foundation pit until the bottom of the foundation pit is flush with the lower end of the rotating rod 12; control the rotating rod 12 to rotate to a horizontal state, fix the support member 13 above the rotating rod 12, and make the support member 13 abut against the pile row 10, such as Figure 5 , Figure 6 shown.

[0064] For details, see Figure 4 When the foundation pit is excavated, an auxiliary driving device is set in the foundation pit, and the auxiliary driving device is used to drive the rotating rod 12 to rotate clockwise, so that the upper end of the rotating rod 12 rotates and probes into the soil layer of the side wall of the foundation pit. When the rotating rod 12 rotates to a horizontal state, it stops rotating and releases the constraint of the auxiliary driving device on it; at this time, Figure 6 As shown, the support member 13 abuts against the pile row 10 .

[0065] In step S2, after the rotating rod 12 rotates to a horizontal state, gravel 17 is filled in the stratum and around the rotating rod 12; after the support member 13 is installed, a steel mesh 16 located below the horizontal rotating shaft 11 is installed between two adjacent support sections 101.

[0066] Accordingly, by filling the crushed stone 17 around the rotating rod 12, additional support and fixing can be provided for the rotating rod 12, making the connection between the rotating rod 12 and the stratum tighter; the crushed stone 17 also has better bearing capacity, can effectively disperse and transmit the stratum pressure, improve the bearing capacity of the entire support device, and enable it to withstand greater soil pressure. The porous structure of the crushed stone 17 is conducive to water penetration and drainage, can improve the drainage performance of the stratum, and prevent the erosion and damage of the support device by the accumulated water. The steel mesh 16 can block the crushed stone 17 and provide additional support force to prevent the crushed stone 17 from being discharged from the drain port, ensuring that the crushed stone 17 forms an indeterminate support layer around the rotating rod 12, thereby enhancing the stability of the support device.

[0067] The support structure constructed by the foundation pit pile support method provided in the embodiment of the present application can form a load-unloading platform in the soil layer of the side wall of the foundation pit, disperse and transfer part of the lateral earth pressure, reduce the lateral force on the support device as a whole, and effectively weaken the influence of the lateral earth pressure on the entire support device; at the same time, the gravity of the soil above the rotating rod 12 will produce a downward torque on the rotating rod 12, and the torque is converted into an upward torque on the support member 13 through the lever principle of the rotating rod 12, and then the support member 13 is used to generate a thrust on the pile row 10, so that the pile row 10 generates a reverse thrust on the soil layer of the side wall of the foundation pit, thereby enhancing the support performance of the entire support device, and solving the problem of poor support effect caused by the weak interaction between the existing foundation pit support device and the soil. By forming a drain outlet 15 between two adjacent support sections 101 and below the horizontal rotation axis 11, the foundation pit support structure and the drainage system are effectively integrated without the need to set up an additional drainage system. Water in the soil layer on the side wall of the foundation pit can be discharged through the drain outlet 15, thereby avoiding soil slippage and foundation pit instability due to untimely drainage, thereby improving the overall stability of the foundation pit.

[0068] The above are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be covered within the protection scope of the present application.

Claims

1. A foundation pit pile support device, characterized in that: The invention comprises a plurality of pile rows (10) arranged at intervals, wherein the pile row (10) comprises a supporting section (101) and a pre-buried section (102) arranged from top to bottom, a horizontal rotating shaft (11) is connected between two adjacent supporting sections (101), and a rotating rod (12) is rotatably connected to the horizontal rotating shaft (11); The two ends of the rotating rod (12) can be rotated to the two sides of the pile row (10) respectively, and the rotating rod (12) is located above one side of the pile row (10) and is connected with a support member (13) for contacting the pile row (10); A blocking member (14) located above the horizontal rotation shaft (11) is connected between two adjacent support segments (101), and a drainage outlet (15) is formed between the two adjacent support segments (101) and below the horizontal rotation shaft (11).

2. The foundation pit pile support device according to claim 1, characterized in that: When the rotating rod (12) rotates to a horizontal state, the supporting member (13) abuts against the pile row (10).

3. The foundation pit pile support device according to claim 1 or 2, characterized in that: The support member (13) comprises two support rods (131), one end of the two support rods (131) is connected to the rotating rod (12), and the other end of the two support rods (131) is used to abut against two adjacent pile rows (10) respectively.

4. The foundation pit pile support device according to claim 3, characterized in that: When the support rod (131) is in contact with the pile row (10), the support rod (131) is inclined from bottom to top toward the pile row (10).

5. The foundation pit pile support device according to claim 3, characterized in that: The rotating rod (12) is provided with two fixing holes (121), and one end of the two supporting rods (131) is fixed in the two fixing holes (121) respectively.

6. The foundation pit pile support device according to claim 1, characterized in that: A steel mesh (16) covering the drainage opening (15) is connected between two adjacent support sections (101).

7. The foundation pit pile support device according to claim 1, characterized in that: The blocking member (14) and the supporting member (13) are located on the same side of the horizontal rotation axis (11).

8. A foundation pit pile support method, characterized in that: Using the foundation pit pile support device according to any one of claims 1 to 7, the method comprises: S1, assembling a pile row (10), a horizontal rotation shaft (11), a rotating rod (12) and a blocking member (14) in a foundation pit pile support device; wherein the rotating rod (12) is arranged vertically; and sinking the assembled structure into a preset position in the stratum; S2, excavating a foundation pit until the bottom of the foundation pit is flush with the lower end of the rotating rod (12); controlling the rotating rod (12) to rotate to a horizontal state, fixing a support member (13) above the rotating rod (12), and making the support member (13) abut against the pile row (10).

9. The foundation pit pile support method according to claim 8, characterized in that: In step S2, after the rotating rod (12) is rotated to a horizontal state, gravel (17) is filled into the ground layer and around the rotating rod (12).

10. The foundation pit pile support method according to claim 8, characterized in that: In step S2, after the support member (13) is installed, a steel mesh (16) located below the horizontal rotation shaft (11) is installed between two adjacent support sections (101).

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