Foundation pit double-row pile supporting structure

Abstract

The utility model discloses a double-row pile supporting structure for a foundation pit. The basement is arranged in the foundation pit; the first supporting pile and the second supporting pile are arranged on the slope side by side; the first supporting top beam is arranged at the top of the first supporting pile; the second supporting top beam is arranged at the top of the second supporting pile; the connecting beam is connected between the first support top beam and the second support top beam; and the replacement support is connected between the second support pile and the basement. Due to the arrangement of the first supporting piles and the second supporting piles, double reinforcement of the side slope is facilitated, and the stability of soil around a foundation pit is guaranteed; the device is arranged at the transition part of the side slope, so that the construction quality and the cost optimization are ensured to a greater extent; through the arrangement of the first supporting top beam, the second supporting top beam and the connecting beam, the two rows of supporting piles are more integrated; and through the arrangement of the crown beam longitudinal bars, the crown beam stirrups and the crown beam waist bars, the strength of the top crown beam is enhanced, and the supporting strength of the supporting piles is further guaranteed.

Description

Technical Field

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

[0002] For the excavation of foundation pits, the stability of the surrounding soil is a prerequisite for construction. In order to meet the stability requirements of the soil around the foundation pit, it is reinforced by slope support, which is usually carried out by soil nailing walls, sprayed anchor support, and setting support piles. However, when the slope is set at multiple levels and the support piles are double-rowed, how to ensure the support effect and the connection of the top of the pile requires targeted settings. Utility Model Content

[0003] The utility model provides a foundation pit double-row pile support structure, which is used to solve technical problems such as the arrangement of the double-row support piles, the top connection and the connection with the surrounding structure.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A double-row pile support structure for a foundation pit, comprising a slope arranged on a foundation pit, a basement arranged inside the foundation pit, a first support pile and a second support pile arranged side by side on the slope, a first support crown beam arranged on the top of the first support pile, a second support crown beam arranged on the top of the second support pile, a connecting beam connected between the first support crown beam and the second support crown beam, and a replacement support connected between the second support pile and the basement;

[0006] The bottom ends of the first and second supporting piles penetrate into the slope soil, and the bottom end elevations are located below the bottom plate elevation of the basement.

[0007] Furthermore, the slope is a secondary slope or a multi-level slope, which is primary, secondary, or multi-level from top to bottom; the primary slope rate of the slope is 1:1, and the secondary and multi-level slope rates are greater than the primary slope rate.

[0008] Furthermore, the first supporting piles and the second supporting piles are arranged at the transition between the primary slope and the secondary slope.

[0009] Furthermore, the first supporting pile and the second supporting pile are both cast-in-place piles, in which longitudinal reinforcement arranged in a circular ring shape is provided, and spiral reinforcement and stirrups are provided in the vertical direction of the longitudinal reinforcement; wherein the longitudinal reinforcement extends out of the top of the cast-in-place pile and is integrally connected with the corresponding crown beam.

[0010] Furthermore, the first supporting crown beam, the second supporting crown beam and the connecting beam are arranged in a U-shape, and connecting beams are arranged at intervals along the length of the first supporting crown beam and the second supporting crown beam.

[0011] Furthermore, the first supporting crown beam and the second supporting crown beam both include cast crown beam concrete, crown beam longitudinal reinforcement arranged inside the crown beam concrete, crown beam stirrups connected to the crown beam longitudinal reinforcement at intervals, and crown beam waist reinforcement connected to adjacent crown beam stirrups.

[0012] Furthermore, the crown beam longitudinal reinforcement is arranged in layers and is arranged in at least three layers of upper, middle and lower layers, and the crown beam stirrups are connected to the outer side of the crown beam longitudinal reinforcement in a mesh shape.

[0013] Furthermore, a drainage hole is provided on the first-level slope, a guardrail is provided on the edge of the top of the slope, and a drainage ditch is provided on the ground inside the guardrail.

[0014] The beneficial effects of the utility model are embodied in:

[0015] 1) The utility model is conducive to double reinforcement of the slope through the arrangement of the first supporting pile and the second supporting pile, thereby ensuring the stability of the soil around the foundation pit; and it is arranged at the transition between the first and second slopes, which ensures the optimization of construction quality and cost to a greater extent;

[0016] 2) The utility model is conducive to ensuring the fixation of the top of the supporting pile body by setting the first supporting crown beam, the second supporting crown beam and the connecting beam, so that the two rows of supporting piles are more integrated;

[0017] 3) The utility model is conducive to strengthening the strength of the top crown beam and further ensuring the supporting strength of the support piles through the arrangement of crown beam longitudinal reinforcement, crown beam stirrups and crown beam waist reinforcement.

[0018] Other features and advantages of the utility model will be described in the subsequent description, and in part will become apparent from the description, or be understood by implementing the utility model; the main purpose and other advantages of the utility model can be realized and obtained through the solutions particularly pointed out in the description. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a schematic diagram of the double-row pile support structure of the foundation pit;

[0020] Figure 2 It is a schematic diagram of the cap beam structure on the first supporting pile or the second supporting pile.

[0021] Figure numbers: 1-foundation pit, 2-slope, 3-ground, 4-basement, 5-bottom plate, 6-replacement support, 7-first supporting piles, 8-second supporting piles, 9-first supporting crown beam, 10-second supporting crown beam, 11-connecting beam, 12-sluice hole, 13-guardrail, 14-drainage ditch, 15-crown beam concrete, 16-crown beam longitudinal reinforcement, 17-crown beam stirrups, 18-crown beam waist reinforcement. DETAILED DESCRIPTION

[0022] Taking an Internet industrial park as an example, its foundation pit 1 is relatively close to the construction land red line. The closest distance from the north side of the excavation surface of foundation pit 1 to the land red line is about 4.70 m, about 5.40 m from the east side to the land red line, about 16.50 m from the south side to the land red line, and about 5.30 m from the west side to the land red line. The excavation slope of slope 2 is relatively large, and its local part is reinforced by a double-row pile support structure.

[0023] As Figure 1 and Figure 2 shown, the double-row pile support structure of the foundation pit includes slope 2 set in foundation pit 1, basement 4 set inside foundation pit 1, first support pile 7 and second support pile 8 arranged side by side on slope 2, first support capping beam 9 set at the top of first support pile 7, second support capping beam 10 set at the top of second support pile 8, connecting beam 11 connected between first support capping beam 9 and second support capping beam 10, and strut 6 connected between second support pile 8 and basement 4. The bottom ends of first support pile 7 and second support pile 8 penetrate into the soil body of slope 2, and the bottom elevation is below the bottom slab 5 elevation of basement 4.

[0024] In this embodiment, slope 2 is a second-level slope 2 or a multi-level slope 2, from top to bottom being the first level, the second level to multiple levels; the slope ratio of the first level of slope 2 is 1:1, and the slope ratios of the second level and multiple levels are greater than that of the first level. First support pile 7 and second support pile 8 are set at the transition between the first-level slope 2 and the second-level slope 2. In this embodiment, drain holes 12 are also set on the first-level slope 2, guardrails 13 are set on the edge of slope 2, and drainage ditches 14 are set on the ground 3 inside the guardrails 13.

[0025] In this embodiment, both first support pile 7 and second support pile 8 are cast-in-place piles. Circularly arranged longitudinal bars are set inside the cast-in-place piles, and spiral bars and stirrups are set vertically on the longitudinal bars; among them, the longitudinal bars extend out of the top of the cast-in-place piles and are integrally connected with the corresponding capping beams. First support capping beam 9, second support capping beam 10 and connecting beam 11 are arranged in a square shape, and connecting beam 11 is set at intervals along the long direction of first support capping beam 9 and second support capping beam 10.

[0026] In this embodiment, both first support capping beam 9 and second support capping beam 10 include cast capping beam concrete 15, capping beam longitudinal bars 16 set inside capping beam concrete 15, capping beam stirrups 17 connected to capping beam longitudinal bars 16 at intervals, and capping beam waist bars 18 connected to adjacent capping beam stirrups 17. Capping beam longitudinal bars 16 are set in layers and at least set in three layers of upper, middle and lower layers, and capping beam stirrups 17 are connected to the outside of capping beam longitudinal bars 16 in a square shape.

[0027] The above description is only a preferred specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that a technician familiar with the technical field thinks of within the technical scope disclosed in the present invention should be included in the protection scope of the present invention.

Claims

1. A double-row pile support structure for a foundation pit, characterized in that: It comprises a side slope (2) arranged on a foundation pit (1), a basement (4) arranged inside the foundation pit (1), a first support pile (7) and a second support pile (8) arranged side by side on the side slope (2), a first support crown beam (9) arranged on the top of the first support pile (7), a second support crown beam (10) arranged on the top of the second support pile (8), a connecting beam (11) connected between the first support crown beam (9) and the second support crown beam (10), and a replacement support (6) connected between the second support pile (8) and the basement (4); The bottom ends of the first support pile (7) and the second support pile (8) are deeply embedded in the soil of the slope (2), and the elevation of the bottom ends is below the elevation of the bottom plate (5) of the basement (4).

2. A double-row pile support structure for a foundation pit as claimed in claim 1, characterized in that: The side slope (2) is a secondary side slope (2) or a multi-level side slope (2), which is primary, secondary, or multi-level from top to bottom; the primary slope of the side slope (2) is 1:1, and the secondary and multi-level slopes are greater than the primary slope.

3. A double-row pile support structure for foundation pit according to claim 2, characterized in that: The first support pile (7) and the second support pile (8) are arranged at the transition point between the primary side slope (2) and the secondary side slope (2).

4. A double-row pile support structure for foundation pit according to claim 1, characterized in that: The first support pile (7) and the second support pile (8) are both cast-in-place piles, wherein longitudinal reinforcement arranged in a circular ring shape is arranged inside the cast-in-place pile, and spiral reinforcement and stirrups are arranged in the vertical direction of the longitudinal reinforcement; wherein the longitudinal reinforcement extends out of the top of the cast-in-place pile and is integrally connected with the corresponding crown beam.

5. A double-row pile support structure for foundation pit according to claim 4, characterized in that: The first supporting crown beam (9), the second supporting crown beam (10) and the connecting beam (11) are arranged in a U-shape, and the connecting beams (11) are arranged at intervals along the length of the first supporting crown beam (9) and the second supporting crown beam (10).

6. A double-row pile support structure for foundation pit according to claim 5, characterized in that: The first supporting crown beam (9) and the second supporting crown beam (10) both comprise cast crown beam concrete (15), crown beam longitudinal reinforcement (16) arranged inside the crown beam concrete (15), crown beam stirrups (17) connected to the crown beam longitudinal reinforcement (16) at intervals, and crown beam waist reinforcement (18) connected to adjacent crown beam stirrups (17).

7. A double-row pile support structure for foundation pit according to claim 6, characterized in that: The crown beam longitudinal reinforcement (16) is arranged in layers and is arranged in at least three layers: upper, middle and lower. The crown beam stirrups (17) are connected to the outer sides of the crown beam longitudinal reinforcement (16) in a mesh shape.

8. A double-row pile support structure for foundation pit according to claim 2, characterized in that: A drainage hole (12) is also provided on the first-level side slope (2), a guardrail (13) is provided on the top side of the side slope (2), and a drainage ditch (14) is provided on the ground (3) inside the guardrail (13).

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