Eccentric stiffening cement mixing pile foundation pit supporting structure

Abstract

The utility model discloses an eccentric stiffening cement mixing pile foundation pit supporting structure, and belongs to the technical field of foundation pit supporting. The structure comprises a main body stirring pile, a reinforced stirring pile, rear insertion type steel and a crown beam, the main body stirring piles are mutually overlapped to form a foundation pit supporting main body structure and a waterproof curtain; the reinforced stirring piles are arranged on the back surface of the main body stirring pile at certain intervals, can be designed to be circular or square and are in lap joint with the main body stirring pile; the rear insertion type steel is inserted into the reinforced stirring pile and embedded into the engaged part of the reinforced stirring pile and the main body stirring pile; the top beams are arranged at the tops of the main stirring piles, the reinforced stirring piles and the rear inserting type steel. The eccentric stiffening mode of the section steel can more efficiently utilize the tensile property of the section steel, effectively solves the problem of insufficient lateral resistance of the mixing pile, and is low in cost and simple and convenient to construct.

Description

Technical Field

[0001] The utility model belongs to the technical field of foundation pit support, and in particular relates to an eccentric reinforced cement mixing pile foundation pit support structure. Background Art

[0002] Cement mixing piles have outstanding advantages such as low cost, short construction period, low construction noise and good water-proof performance, and are widely used in the field of foundation pit support.

[0003] Cement mixing piles use a series of physical and chemical reactions between cement and soft soil to consolidate the soil and form cement soil piles with integrity, water stability and certain strength. Therefore, their own strength is limited. In order to improve the lateral resistance of its support structure, steel sections (SMW method) or prefabricated prestressed pipe piles are inserted into cement mixing piles. Since the stiffening materials (including steel sections and prefabricated concrete) are inside the cement mixing piles, the stress-bearing properties of the stiffening materials are not fully utilized, resulting in limited improvement in the lateral resistance of the overall support structure. In the case of more stringent foundation pit design conditions, double-row mixing piles, or even a combination of single-row or double-row mixing piles and bored cast-in-place piles, are sometimes required, which significantly increases the project cost and affects the full realization of the technical and economic benefits of cement mixing piles.

[0004] Therefore, improving the reinforcement method of cement mixing piles, realizing a cement mixing pile support structure with low cost, simple construction and excellent performance, and expanding the application scenarios of this technology are of great significance to the development and improvement of foundation pit support technology. Utility Model Content

[0005] The utility model aims at solving the problems of low strength and weak lateral resistance of cement mixing piles and provides an eccentrically reinforced cement mixing pile foundation pit support structure, thereby realizing a cement mixing pile support structure with low cost, simple construction and excellent performance.

[0006] The utility model provides the following technical solutions:

[0007] An eccentric reinforced cement mixing pile foundation pit support structure comprises a main mixing pile, a reinforced mixing pile, a post-insertion steel section and a crown beam.

[0008] Preferably, the main mixing piles overlap each other to form a main structure of foundation pit support and a water-stop curtain.

[0009] Preferably, the reinforced mixing pile is arranged on the back of the main mixing pile and overlaps with the main mixing pile.

[0010] Preferably, the reinforced mixing pile can be designed to be round or square.

[0011] Preferably, the spacing between the reinforced mixing piles can be optimized according to design requirements.

[0012] Preferably, the rear-inserted steel section is inserted into the reinforced mixing pile and embedded in the engaging portion between the reinforced mixing pile and the main mixing pile.

[0013] Preferably, the crown beam is arranged on the top of the main mixing pile, the reinforced mixing pile and the rear-inserted steel section.

[0014] An eccentric reinforced cement mixing pile foundation pit support structure comprises the following steps: constructing main mixing piles; constructing reinforced mixing piles; post-inserting steel sections; and constructing crown beams.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] (1) The main mixing piles in the present invention adopt pile bodies with larger diameters, which interlock with each other to form a main supporting structure with certain strength and good overall performance.

[0017] (2) The reinforced mixing pile of the utility model adopts a smaller diameter pile body, which is located at the back of the main mixing pile, increasing the cross-sectional area of ​​the main support structure to a certain extent to improve the structural lateral resistance performance and also providing space for the rear-inserted steel.

[0018] (3) The rear-inserted steel of the utility model is arranged in the reinforced mixing pile. From the perspective of the cross-sectional position, it is located on the tensile side of the main support structure, which can fully utilize the tensile properties of the steel and more efficiently improve the lateral resistance of the overall support structure. At the same time, the rear-inserted steel is interlaced with the main mixing pile and the reinforced mixing pile, ensuring the integrity of the cross-sectional force of the three.

[0019] (4) The arrangement of the reinforced mixing piles and the rear-inserted steel sections of the utility model can be flexibly optimized according to design requirements to further save materials and reduce costs.

[0020] (5) The cap beam of the utility model further enhances the cooperative working ability of the main mixing piles, the reinforced mixing piles and the rear-inserted steel sections, thereby ensuring the integrity of the support structure.

[0021] (6) The utility model improves the traditional SMW construction method and forms an eccentric reinforced cement mixing pile support structure with excellent performance, low cost, fast construction, and obvious technical and economic advantages. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a plan schematic diagram of the utility model.

[0023] Figure 2 It is a cross-sectional schematic diagram of the utility model.

[0024] The markings in the figure are: 1. Main mixing pile; 2. Reinforced mixing pile; 3. Post-inserted steel; 4. Crown beam; 5. The interlocking part between the reinforced mixing pile and the main mixing pile. DETAILED DESCRIPTION

[0025] The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the protection scope of the utility model.

[0026] It should be noted that, in the description of the present invention, the directions or positional relationships indicated by terms such as "front", "rear", "left", "right", "up", "down", "inside" and "outside" are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0027] like Figure 1 and 2 As shown, an eccentric reinforced cement mixing pile foundation pit support structure includes a main mixing pile 1, a reinforced mixing pile 2, a post-insertion steel 3 and a crown beam 4.

[0028] The main mixing piles 1 are overlapped with each other to form a main structure of foundation pit support and a water-stopping curtain.

[0029] The reinforced mixing pile 2 is arranged on the back of the main mixing pile 1 and overlaps with the main mixing pile 1 .

[0030] The reinforced mixing pile 2 can be designed to be round or square.

[0031] The spacing between the reinforced mixing piles 2 can be optimized according to design requirements.

[0032] The rear-inserted steel 3 is inserted into the reinforced mixing pile 2 and embedded in the engaging portion 5 between the reinforced mixing pile and the main mixing pile.

[0033] The crown beam 4 is arranged on the top of the main mixing pile 1, the reinforced mixing pile 2 and the rear-inserted steel 3.

[0034] A pipe gallery foundation pit support structure under a soft soil base comprises the following steps: constructing a main body mixing pile 1; constructing a reinforced mixing pile 2; post-inserting a steel section 3; and constructing a crown beam 4.

[0035] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An eccentric reinforced cement mixing pile foundation pit support structure, characterized in that: It includes main mixing piles, reinforced mixing piles, rear-inserted steel and crown beams; the main mixing piles overlap each other to form the main structure of foundation pit support and water-stop curtain; the reinforced mixing piles are arranged on the back of the main mixing piles and overlap with the main mixing piles; the rear-inserted steel is inserted into the reinforced mixing piles and embedded in the bite part between the reinforced mixing piles and the main mixing piles; Wherein, the reinforced mixing pile is round or square.

2. The eccentric reinforced cement mixing pile foundation pit support structure according to claim 1 is characterized in that: The spacing between the reinforced mixing piles can be optimized according to design requirements.

3. The eccentric reinforced cement mixing pile foundation pit support structure according to claim 1 is characterized in that: The crown beam is arranged on the top of the main mixing pile, the reinforced mixing pile and the rear-inserted steel.

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