Multi-layer inclined strut self-stabilizing type foundation pit supporting device

Abstract

The utility model discloses a multi-layer inclined strut self-stabilizing type foundation pit supporting device. A pit top inclined strut structure and an in-pit inclined strut structure are arranged in the foundation pit supporting device. The pit top inclined strut structure comprises a pit top enclosing purlin (331) and a plurality of pit top inclined strut piles (321); the pit top enclosing purlin is arranged on the support pile enclosure and is positioned at the top of the foundation pit (2); for each pit top inclined supporting pile, one end of the pit top inclined supporting pile is directly and fixedly connected with the pit top surrounding purlin, and the other end of the pit top inclined supporting pile is obliquely inserted into a soil layer at the bottom of the foundation pit; the in-pit diagonal bracing structure comprises an in-pit enclosing purlin (332) and a plurality of in-pit diagonal bracing piles (322); the in-pit enclosing purlin is arranged on the enclosure of the support piles and is positioned in the foundation pit; and for each in-pit inclined supporting pile, one end of the in-pit inclined supporting pile is directly and fixedly connected with the in-pit surrounding purlin, and the other end of the in-pit inclined supporting pile is obliquely inserted into a soil layer at the bottom of the foundation pit. The foundation pit supporting device can powerfully support the foundation pit.

Description

Technical Field

[0001] The utility model relates to a foundation pit support technology, in particular to a multi-layer inclined strut self-stabilizing foundation pit support device. Background Technique

[0002] With the continuous advancement of urban development, more and more new construction projects emerge, and deep and large foundation pit projects develop rapidly. However, with the continuous deepening of the urban construction process, the environment around new foundation pit projects is becoming more and more complex, and the environmental protection requirements are getting higher and higher, which puts forward higher requirements for the design and construction of foundation pit enclosures.

[0003] The traditional foundation pit support structure in the form of horizontal internal support is not the preferred solution due to many restrictive factors such as long construction period, high construction space requirements, complex construction processes, and high project cost.

[0004] The self-stabilizing foundation pit support structure technology patent technology has the advantages of simple construction processes, low requirements for the construction site environment, cross-operation basically not occupying the effective project duration, open excavation, etc., and is increasingly applied in foundation pit enclosures.

[0005] The existing self-stabilizing foundation pit support structure technology is mainly single-layer inclined strut support, which has the following deficiencies:

[0006] 1) With the continuous development of underground space, the depth of the foundation pit is continuously deepened, and the single-layer inclined strut system cannot meet the requirements of deeper foundation pit excavation;

[0007] 2) When the foundation pit is dug to a relatively deep depth, the existing self-stabilizing foundation pit support needs to adopt the enclosure form of double-row piles, which requires a large space and cannot make full use of the underground space;

[0008] 3) During the foundation pit excavation process, the deformation in the middle of the support pile is relatively large, and the deformation control ability of the single-layer inclined strut self-stabilizing foundation pit support structure is weak;

[0009] 4) The bending resistance of the single-layer front strut inclined pile is weak. When the foundation pit is dug to a relatively deep depth, a large bending moment will be generated in the middle of the front strut inclined pile, and the front strut inclined pile will be deformed too much and there is a risk of instability. Summary of the Invention

[0010] The purpose of the utility model is to provide a multi-layer inclined strut self-stabilizing foundation pit support device, which can form a strong support for the foundation pit.

[0011] In order to achieve the above technical purpose, the utility model adopts the following technical solutions:

[0012] A multi-layer inclined strut self-stabilizing foundation pit support device, which includes a plurality of support piles. The plurality of support piles are arranged around the foundation pit to form a support pile enclosure. A pit top inclined strut structure and a pit inner inclined strut structure are provided in the foundation pit support device. The pit top inclined strut structure includes a pit top collar and a plurality of pit top inclined strut piles. The pit top collar is arranged on the support pile enclosure and is located at the top of the foundation pit. One end of the pit top inclined strut pile is directly fixedly connected to the pit top collar, and the other end of the pit top inclined strut pile is obliquely inserted into the soil layer at the bottom of the foundation pit. The pit inner inclined strut structure includes a pit inner collar and a plurality of pit inner inclined strut piles. The pit inner collar is arranged on the support pile enclosure and is located inside the foundation pit. One end of the pit inner inclined strut pile is directly fixedly connected to the pit inner collar, and the other end of the pit inner inclined strut pile is obliquely inserted into the soil layer at the bottom of the foundation pit.

[0013] Further, the number of the pit inner inclined strut structures provided is 1 to 3 layers.

[0014] Further, reinforcement structures are provided at the bottom ends of the pit top inclined strut piles and the pit inner inclined strut piles.

[0015] Further, the reinforcement structures provided at the bottom ends of the pit top inclined strut piles and the pit inner inclined strut piles are grouting units.

[0016] Further, the cross-section of the pit inner collar is trapezoidal.

[0017] Further, the support piles in the support pile enclosure are in the form of single-row piles, double-row piles or multi-row piles.

[0018] The beneficial effects of the foundation pit support device of the present utility model compared with the prior art are as follows:

[0019] 1) In the foundation pit support device of the present utility model, two inclined strut structures are provided, namely a pit top inclined strut structure and a pit inner inclined strut structure. These two inclined strut structures can form good support for the foundation pit. In this way, only single-row support piles can achieve good support effects, without the need for double-row support piles, thereby significantly saving the occupied space of the foundation pit support structure.

[0020] 2) By providing one layer or several layers of pit inner inclined strut structures, the stress state of the support piles can be significantly improved, enabling the foundation pit support device to be applied to foundation pit projects with deeper excavation depths. Description of the Drawings

[0021] Figure 1 It is a structural schematic diagram of a multi-layer inclined strut self-stabilizing foundation pit support device based on Embodiment 1 of the present utility model;

[0022] Figure 2 It is a structural schematic diagram of a multi-layer inclined strut self-stabilizing foundation pit support device based on Embodiment 2 of the present utility model. Detailed implementation manners

[0023] The following uses specific embodiments to further illustrate the present utility model:

[0024] Embodiment 1:

[0025] Refer to Figure 1 , Embodiment 1 provides a foundation pit support device. The foundation pit support device includes a plurality of support piles 311, and these support piles 311 are arranged around the foundation pit position. These support piles 311 are arranged around the perimeter of the foundation pit, and each support pile 311 is inserted into the ground 1 according to construction requirements. All the support piles 311 form a "support pile enclosure" around the foundation pit position.

[0026] It should be noted that the "support pile enclosure" refers to the combination of all support piles around the perimeter of the foundation pit.

[0027] In the foundation pit support device of Embodiment 1, a bracing structure is provided for the support pile enclosure. Specifically, the basic concept of the bracing structure is as follows:

[0028] The bracing structure includes a waling beam and a large number of bracing piles.

[0029] The waling beam is arranged on the support pile enclosure.

[0030] For each bracing pile, one end of the bracing pile is used as the top bracing end and is directly fixedly connected to the waling beam, and the other end of the bracing pile is used as the bottom end and obliquely faces downward towards the inside of the foundation pit, and is inserted into the soil layer at the bottom of the foundation pit. In this way, the bracing structure can support the side wall of the foundation pit based on the bottom of the foundation pit to prevent the side wall of the foundation pit from collapsing.

[0031] Refer to Figure 1 , specifically in Embodiment 1,

[0032] Two layers of bracing structures are provided in the foundation pit support device, and the two layers of bracing structures are respectively a top bracing structure and an in-pit bracing structure.

[0033] Regarding the top bracing structure, the top bracing structure includes a top waling beam 331 and a large number of top bracing piles 321.

[0034] The top waling beam 331 is arranged on the support pile enclosure and is located at the top of the foundation pit 2;

[0035] For each top bracing pile 321, one end of the top bracing pile 321 is used as the top bracing end and is directly fixedly connected to the top waling beam 331, and the other end of the top bracing pile 321 is used as the bottom end and obliquely faces downward towards the inside of the foundation pit 2, and is inserted into the soil layer at the bottom of the foundation pit 2, thereby forming a support for the top of the foundation pit 2.

[0036] For the in-pit diagonal bracing structure, the in-pit diagonal bracing structure includes an in-pit circumferential purlin 332 and a plurality of in-pit diagonal bracing piles 322.

[0037] The in-pit circumferential purlin 332 is arranged on the enclosure of the retaining piles and is located inside the foundation pit 2;

[0038] For each in-pit diagonal bracing pile 322, one end of the in-pit diagonal bracing pile 322 serves as the top bracing end and is directly fixedly connected to the in-pit circumferential purlin 332. The other end of the in-pit diagonal bracing pile 322 serves as the bottom end and obliquely faces downward towards the inner side of the foundation pit 2, and is inserted into the soil layer at the bottom of the foundation pit 2, thereby forming a support for the side wall surface of the foundation pit 2.

[0039] It should be noted that for the "connection between the top-pit diagonal bracing pile 321 and the top-pit circumferential purlin 331" and the "connection between the in-pit diagonal bracing pile 322 and the in-pit circumferential purlin 332", the connection positions both correspond to the positions where the retaining piles 311 are located, and both the top-pit diagonal bracing pile 321 and the in-pit diagonal bracing pile 322 directly brace against the circumferential purlin of the retaining piles. Such a setting is beneficial to achieving a stable support structure.

[0040] It should be noted that the cross-section of the in-pit circumferential purlin 332 is designed as a trapezoid. In this way, the stress state of the in-pit circumferential purlin 332 can be improved.

[0041] It should be noted that in this embodiment, as an example, only one layer of in-pit diagonal bracing structure is provided. In other embodiments, if the depth of the foundation pit is relatively deep, several layers of in-pit diagonal bracing structures can be set according to actual needs, usually 1 to 3 layers.

[0042] The foundation pit bracing device of Embodiment 1 has the following advantages:

[0043] 1) In the foundation pit bracing device of Embodiment 1, two layers of diagonal bracing structures are provided, namely the top-pit diagonal bracing structure and the in-pit diagonal bracing structure. These two layers of diagonal bracing structures can form good support for the foundation pit. In this way, only a single row of retaining piles can achieve good bracing effects, without the need for double-row retaining piles, thereby significantly saving the occupied space of the foundation pit bracing structure. Moreover, whether it is the top-pit diagonal bracing structure or the in-pit diagonal bracing structure, the diagonal bracing piles therein directly brace against the side wall of the foundation pit, thereby being able to achieve a strong support effect and enhancing the overall structural stiffness;

[0044] 2) By setting one layer or several layers of in-pit diagonal bracing structures, the stress state of the retaining piles 311 can be significantly improved, enabling the foundation pit bracing device of Embodiment 1 to be applied to foundation pit projects with deeper excavation depths.

[0045] Embodiment 2:

[0046] Embodiment 2 provides a foundation pit support device, which is improved and deformed on the basis of the foundation pit support device of Embodiment 1.

[0047] See Figure 2 , compared with the foundation pit support device of Embodiment 1, the foundation pit support device of Embodiment 2 has been improved and deformed in two main aspects.

[0048] The first aspect of improvement and deformation:

[0049] On the basis of the original support pile 311, another row of support piles 311 is added on the periphery, and a connecting beam 34 is also arranged between the two rows of support piles 311. The connecting beam 34 connects the two rows of support piles 311 together, thus forming a double-row pile framework. That is to say, in Embodiment 2, the support piles in the enclosure of the support piles adopt the form of double-row piles. In this way, the structure of the entire foundation pit support device is made more firm and suitable for some large foundation pits.

[0050] It should be noted that in other embodiments, the form of multi-row piles can also be adopted.

[0051] The second aspect of improvement and deformation:

[0052] Grouting units 35 are arranged at the bottom ends of the top inclined support piles 321 and the inner inclined support piles 322 in the pit. In this way, through processes such as bottom grouting and under-reaming, the bearing capacity of the top inclined support piles 321 and the inner inclined support piles 322 in the pit can be further increased.

[0053] It should be noted that in other embodiments, other forms of strengthening measures can also be arranged at the bottom ends of the inclined support piles to achieve the bearing capacity of the inclined support piles.

[0054] The above are only the preferred embodiments of the present invention and are not used to limit the protection scope of the present invention. Therefore, any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A multi - layer inclined - brace self - stabilizing foundation pit support device. The foundation pit support device includes a plurality of support piles (311), and the plurality of support piles (311) are arranged around the foundation pit (2) to form a support - pile enclosure; It is characterized in that: The foundation pit support device is provided with a top - of - pit inclined - brace structure and an in - pit inclined - brace structure; The top - of - pit inclined - brace structure includes a top - of - pit purlin (331) and a plurality of top - of - pit inclined - brace piles (321); The top - of - pit purlin (331) is arranged on the support - pile enclosure and is located at the top of the foundation pit (2); One end of the top - of - pit inclined - brace pile (321) is directly fixedly connected to the top - of - pit purlin (331), and the other end of the top - of - pit inclined - brace pile (321) is obliquely inserted into the soil layer at the bottom of the foundation pit (2); The in - pit inclined - brace structure includes an in - pit purlin (332) and a plurality of in - pit inclined - brace piles (322); The in - pit purlin (332) is arranged on the support - pile enclosure and is located inside the foundation pit (2); One end of the in - pit inclined - brace pile (322) is directly fixedly connected to the in - pit purlin (332), and the other end of the in - pit inclined - brace pile (322) is obliquely inserted into the soil layer at the bottom of the foundation pit (2).

2. The multi-layer diagonal bracing self-stabilizing foundation pit support device according to claim 1, characterized in that: The number of the in - pit inclined - brace structures arranged is 1 to 3 layers.

3. The multi-layer inclined strut self-stabilizing foundation pit support device according to claim 1, characterized in that: Reinforcing structures are arranged at the bottom ends of the top - of - pit inclined - brace piles (321) and the in - pit inclined - brace piles (322).

4. The multi-layer inclined strut self-stabilizing foundation pit support device according to claim 3, wherein: The reinforcing structures arranged at the bottom ends of the top - of - pit inclined - brace piles (321) and the in - pit inclined - brace piles (322) are grouting units (35).

5. The multi-layer inclined strut self-stabilizing foundation pit support device according to claim 1, characterized in that: The cross - section of the in - pit purlin (332) is trapezoidal.

6. The multi-layer inclined strut self-stabilizing foundation pit support device according to claim 1, characterized in that: The support piles in the support - pile enclosure are in the form of single - row piles, double - row piles or multi - row piles.

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