Double-row pile supporting structure

Abstract

The utility model relates to the field of foundation pit supporting, and aims to provide a double-row pile supporting structure which comprises a side slope, a plurality of front-row piles and a plurality of rear-row piles are embedded in the side slope, the front-row piles are distributed at intervals left and right along the edge of the side slope, and the rear-row piles are embedded behind the front-row piles in a one-to-one correspondence mode. A top beam A extending leftwards and rightwards is erected on the tops of the front-row piles, a top beam B extending leftwards and rightwards is erected on the tops of the rear-row piles, and connecting beams for connecting the top beam A and the top beam B are further arranged between the front-row piles and the corresponding rear-row piles. A plurality of anchor rods are arranged on the front-row piles and the corresponding rear-row piles in a penetrating mode, and the rear ends of the anchor rods extend backwards and are anchored in the side slope. The pile is high in structural integrity, clear in force transmission path and good in lateral soil pressure resistance, and the displacement of the top of the pile body can be actively adjusted.

Description

Technical Field

[0001] The utility model relates to the field of foundation pit support, in particular to a double-row pile support structure. Background Art

[0002] Foundation pit support forms include slope excavation, soil nail wall, diaphragm wall and row pile support, etc. Among them, row pile support has become a relatively common support method in foundation pit support due to its simple construction technology, flexible plane layout and low cost. Traditional row pile support is a support system composed of vertically driven piles tightly connected with a capping beam. However, in complex construction environments, traditional row pile support has some defects, such as:

[0003] 1. The row pile support only relies on the capping beam set at the top for connection, and the stress cannot be reliably transmitted between the piles, so the overall stability of the structure is relatively weak and it cannot provide a reliable support effect;

[0004] 2. Traditional row piles are usually affected by soil pressure during construction, resulting in significant displacement at the pile top. This displacement not only affects the stability of the support structure, but also increases the internal force of the pile body, thereby reducing the bearing capacity of the pile;

[0005] 3. Traditional row piles are often vertically arranged. However, in the case of deep foundation pits or high slopes, the vertical piles are not sufficient to resist large lateral soil pressure, resulting in excessive deformation of the piles and instability of the slope. Content of the Utility Model

[0006] The purpose of the utility model is to provide a double-row pile support structure with strong structural integrity, clear force transmission path and good performance in resisting lateral soil pressure.

[0007] The purpose of the utility model is realized through the following technical solutions:

[0008] A double-row pile support structure includes a slope, in which a number of front-row piles and a number of rear-row piles are buried. The front-row piles are arranged at intervals from left to right along the edge of the slope, and the rear-row piles are correspondingly buried one by one behind each front-row pile;

[0009] A capping beam A extending left and right is erected on the tops of the front-row piles, a capping beam B extending left and right is erected on the tops of the rear-row piles, and a connecting beam connecting the capping beam A and the capping beam B is also provided between each front-row pile and its corresponding rear-row pile;

[0010] A number of anchor rods are penetrated through the corresponding front-row piles and rear-row piles, and the rear ends of the anchor rods extend backward and are anchored inside the slope.

[0011] Compared with the prior art, the advantages of the utility model are as follows:

[0012] 1. By setting the capping beam A, capping beam B and connecting beam, the load can be evenly transferred between the pile bodies, avoiding excessive concentrated load on a single pile, thus reducing the local stress concentration phenomenon and improving the overall bearing capacity of the retaining structure;

[0013] 2. By arranging anchor rods through the front row of piles and the rear row of piles, the integrity of the front row of piles and the rear row of piles is improved, and the rear end of the anchor rod is anchored in the soil body inside the slope, enabling the anchor rod to bond and friction with the slope soil body, thereby enhancing the anti-overturning ability of the retaining structure;

[0014] 3. Since the front row of piles and the rear row of piles are obliquely buried, the obliquely arranged pile bodies can offset a part of the bending moment generated by the lateral soil pressure under their own gravity, making the stress and deformation performance of the pile bodies far superior to that of traditional vertical pile bodies;

[0015] 4. By setting the jacks between the front row of piles and the capping beam A, it is possible to actively adjust the pile top displacement during the construction process, thereby reducing the influence of structural displacement on the surrounding environment. In addition, the downward load applied by the jacks reduces the bending moment on the front row of piles, thereby improving the bearing capacity of the pile bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a sectional view of an embodiment of a double-row pile retaining structure of the present utility model;

[0017] Figure 2 is a front view of an embodiment of a double-row pile retaining structure of the present utility model;

[0018] Figure 3 is a structural schematic diagram of an embodiment of a double-row pile retaining structure of the present utility model;

[0019] Figure 4 is a top view schematic diagram of an embodiment of a double-row pile retaining structure of the present utility model.

[0020] Reference numerals: 1 slope, 2 front row of piles, 3 rear row of piles, 4 capping beam A, 5 capping beam B, 6 connecting beam, 7 anchor rod, 8 jack, 9 enlarged bottom pile end. DETAILED DESCRIPTION OF THE INVENTION

[0021] The following will describe the content of the present utility model in detail with reference to the accompanying drawings and embodiments:

[0022] As Figures 1-4 shown, it is a schematic diagram of an embodiment of a double-row pile retaining structure provided by the present utility model.

[0023] A double-row pile retaining structure includes a slope 1, in which a plurality of front row of piles 2 and a plurality of rear row of piles 3 are buried. The plurality of front row of piles 2 are arranged at intervals left and right along the edge of the slope 1, and the plurality of rear row of piles 3 are correspondingly buried behind each front row of piles 2;

[0024] A water cutoff curtain is also provided behind the rear row of piles 3 (the water cutoff curtain is a continuous water isolation body commonly used in foundation engineering to isolate, block or reduce the entry of groundwater into the foundation pit, so it will not be elaborated here).

[0025] The tops of several front row of piles 2 are provided with a capping beam A4 extending left and right, the tops of several rear row of piles 3 are provided with a capping beam B5 extending left and right, and a connecting beam 6 connecting the capping beam A4 and the capping beam B5 is also provided between each front row of piles 2 and its corresponding rear row of piles 3;

[0026] Several anchor rods 7 are penetrated through the corresponding front row of piles 2 and rear row of piles 3, and the rear ends of the anchor rods 7 extend backward and are anchored inside the slope 1.

[0027] The front row of piles 2 and the corresponding rear row of piles 3 are provided with anchor holes for the anchor rods 7 to pass through, and the front ends of the anchor rods 7 are fixed on the front sides of the front row of piles 2 by external anchor fittings.

[0028] The front row of piles 2 are obliquely buried parallel to the slope surface of the slope 1, and the rear row of piles 3 are parallel to the front row of piles 2.

[0029] Several of the anchor rods 7 are arranged at intervals up and down along the extending direction of the front row of piles 2, and the anchor rods 7 are perpendicular to both the front row of piles 2 and the rear row of piles 3.

[0030] Furthermore, the interval between each anchor rod 7 is 2m.

[0031] A jack 8 for adjusting the pile top displacement is provided between each front row of piles 2 and the capping beam A4, and the jack 8 also applies a downward load, so that the bending moment received by the front row of piles 2 is reduced, thereby improving the structural bearing capacity.

[0032] The bottom ends of the front row of piles 2 and the rear row of piles 3 are both enlarged pile ends 9 with a smaller upper part and a larger lower part, and the enlarged pile ends 9 are used to improve the anti-pulling performance of the pile body.

[0033] The working principle of the present utility model is generally as follows:

[0034] The front row of piles 2 and the rear row of piles 3 are connected by the capping beam A 4, the capping beam B 5, the connecting beam 6 and the anchor rod 7 to form a rigid frame that works together to resist the lateral pressure of the soil outside the foundation pit. The anchor rod 7 not only connects the front row of piles 2 and the rear row of piles 3, but also its rear end is anchored into the soil inside the slope 1. Through the bonding friction between the anchor rod 7 and the soil of the slope 1, the retaining structure enhances its anti-overturning ability. At the same time, the use of an enlarged pile tip 9 not only reduces the pile tip pressure, but also improves the anti-pulling ability of the retaining structure. By setting the jack 8, it is possible to actively adjust the pile top displacement during the construction process to maintain the relative stability of the outer plane of the foundation pit. In addition, the front row of piles 2 and the rear row of piles 3 are obliquely buried, and the self-weight of the pile body can offset part of the bending moment generated by the lateral soil pressure, thereby enhancing the bearing capacity of the retaining structure.

[0035] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

Claims

1. A double-row pile support structure, comprising a slope (1), characterized in that: A plurality of front-row piles (2) and a plurality of rear-row piles (3) are buried in the side slope (1), the plurality of front-row piles (2) are arranged at intervals along the left and right sides of the side slope (1), and the plurality of rear-row piles (3) are buried one by one behind each of the front-row piles (2); A crown beam A (4) extending leftward and rightward is erected on the top of a plurality of front-row piles (2), a crown beam B (5) extending leftward and rightward is erected on the top of a plurality of rear-row piles (3), and a connecting beam (6) connecting the crown beam A (4) and the crown beam B (5) is also arranged between each front-row pile (2) and its corresponding rear-row pile (3); A plurality of anchor rods (7) are provided on the front row piles (2) and the corresponding rear row piles (3), and the rear ends of the anchor rods (7) extend backwards and are anchored inside the slope (1).

2. The double-row pile support structure according to claim 1 is characterized in that: The front row of piles (2) are buried obliquely parallel to the slope surface of the slope (1), and the rear row of piles (3) are parallel to the front row of piles (2).

3. The double-row pile support structure according to claim 2 is characterized in that: A plurality of anchor rods (7) are arranged at intervals in the upper and lower directions along the extension direction of the front row of piles (2), and the anchor rods (7) are perpendicular to the front row of piles (2) and the rear row of piles (3).

4. The double-row pile support structure according to claim 1 is characterized in that: A jack (8) for adjusting the displacement of the pile top is provided between each front row pile (2) and the crown beam A (4).

5. The double-row pile support structure according to any one of claims 1 to 4, characterized in that: The bottom ends of the front row piles (2) and the rear row piles (3) are both expanded bottom pile ends (9) that are smaller at the top and larger at the bottom.

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