A cantilever combined foundation pit support mechanism and combined construction method

Abstract

The present invention discloses a cantilever combined foundation pit support mechanism and a combined construction method, wherein the mechanism includes a plurality of groups of vertical support piles and oblique support piles for use in combination, wherein a pile side wall slot is staggered on two opposite side walls of the vertical support pile, the two staggered pile side wall slots are connected, and the oblique support piles are matched and inserted obliquely into the two pile side wall slots; two beam crowns are arranged in parallel at the tops of the plurality of groups of vertical support piles and oblique support piles, and a plurality of connecting beams are arranged in parallel between the two beam crowns to fix the vertical support piles and the oblique support piles. An integral force system is formed by the combination of the vertical support piles and the oblique support piles, and no additional support is required; the oblique support piles are all buried inside the soil, so earth excavation is more convenient, and the vertical support piles can be excavated by cantilever.

Description

Technical Field

[0001] The invention belongs to the field of building construction, and in particular relates to a cantilever combined foundation pit supporting mechanism and a combined construction method. Background Art

[0002] In conventional SMW (Soil Mixing Wall) pile construction, there is no additional connection between the H-beam and the crown beam. When the crown beam is subjected to a large vertical supporting force, the H-beam and the crown beam may become detached.

[0003] When constructing the foundation pit support system, conventional support piles need to be set up with horizontal supports or inclined supports. On the one hand, this will increase the cost. On the other hand, the existence of the support will hinder the subsequent earth excavation and underground structure construction, slowing down the construction progress. Summary of the invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a cantilever combined foundation pit support mechanism and a combined construction method, that is, to propose a combined structure that is assembled into a whole through the combination of support piles, thereby achieving the effect of cantilever excavation of the foundation pit, thereby solving the above-mentioned problem.

[0005] The purpose of the present invention is achieved by the following technical solutions:

[0006] A cantilever combined foundation pit support mechanism, the mechanism includes multiple groups of vertical support piles and oblique support piles for use together, wherein a pile side wall slot is staggered on two opposite side walls of the vertical support pile, the two staggered pile side wall slots are connected, and the oblique support piles are matched and inserted obliquely into the two pile side wall slots; two beam crowns are arranged in parallel at the top ends of the multiple groups of vertical support piles and oblique support piles, and multiple connecting beams are arranged in parallel between the two beam crowns to fix the vertical support piles and the oblique support piles.

[0007] Preferably, a bottom steel plate for sealing is provided at the bottom of the vertical supporting piles.

[0008] Preferably, a breakable baffle is provided on the groove of the pile side wall.

[0009] Preferably, the vertical support piles are hollow square steel.

[0010] Preferably, the oblique supporting piles are square steel or round steel.

[0011] A combined construction method according to the aforementioned support mechanism, the method comprising the following steps: S1, driving vertical support piles, according to the location of the foundation pit, driving an appropriate number of vertical support piles; S2, driving oblique support piles, according to the vertical support piles that have been driven, driving the oblique support piles obliquely at a matching angle and distance, and ensuring that the oblique support piles obliquely penetrate the vertical support piles after passing through the grooves on the pile side walls; S3, fixing the support piles, filling micro-expansive concrete from the top of the vertical support piles inwards, so that the vertical support piles and the oblique support piles are fixed as one; S4, after the construction of a row of support piles is completed, pouring reinforced concrete crown beams on the top of the vertical support piles and the oblique support piles, and then connecting the two crown beams together through a connecting beam to complete the construction of the support mechanism.

[0012] Compared with the prior art, the beneficial effects of the present invention are as follows: the present solution can facilitate the construction of the support system and earth excavation: 1. By combining the vertical support piles and the oblique support piles, an overall force system is formed without the need for additional support; 2. Since the oblique support piles are all buried inside the soil, earth excavation is more convenient, and the vertical support piles can be excavated by cantilever. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 and Figure 2 It is a schematic diagram of vertical support piles;

[0014] Figure 3 It is a schematic diagram of the combination of vertical support piles and oblique support piles;

[0015] Figure 4 It is the overall assembly diagram of the support body mechanism;

[0016] Figure 5 It is a cross-sectional schematic diagram of the application scenario of the support mechanism.

[0017] In the figure: 1. Vertical supporting piles; 2. Slots on the side walls of piles; 3. Baffles; 4. Bottom steel plates; 5. Oblique supporting piles; 6. Crown beams; 7. Connecting beams. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] A cantilever combined foundation pit support mechanism, see Figure 1-Figure 5The mechanism includes multiple groups of vertical supporting piles 1 and oblique supporting piles 5 for use in conjunction with each other, wherein a pile side wall slot 2 is staggeredly opened on two opposite side walls of the vertical supporting pile 1, the two staggered pile side wall slots 2 are connected, and the oblique supporting pile 5 is matched and penetrates and obliquely inserted into the two pile side wall slots 2; two beam crowns 6 are arranged in parallel at the top ends of the multiple groups of vertical supporting piles 1 and oblique supporting piles 5, and multiple connecting beams 7 are arranged in parallel between the two beam crowns 6 to fix the vertical supporting piles 1 and the oblique supporting piles 5.

[0020] A bottom steel plate 4 for sealing is arranged at the bottom of the vertical supporting pile 1 .

[0021] A breakable baffle 3 is provided on the groove 2 of the pile side wall.

[0022] The vertical supporting piles 1 are hollow square steel.

[0023] The oblique supporting piles 5 are square steel or round steel.

[0024] Specifically, grooves are formed on the side walls at both ends of the vertical supporting pile 1 to form relatively staggered and through-set pile side wall grooves 2, which can be used for the insertion of the oblique supporting pile 5. During construction, the vertical supporting pile 1 is first driven in. In order to prevent the soil from entering during this process, baffles 3 are set at both ends of the side wall for sealing. The baffle 3 can be made of cardboard or plastic board, which is pasted on the side wall of the vertical supporting pile 1, and the bottom is sealed with a bottom steel plate 4. After the vertical supporting pile 1 is driven into the soil, the oblique supporting pile 5 is driven in from one side at a certain angle. The oblique supporting pile 5 penetrates the baffle 3 and then penetrates the vertical supporting pile 1, and then the vertical supporting pile 1 is filled with micro-expansive concrete, so that the vertical supporting pile 1 and the oblique supporting pile 5 form a whole. After the construction of a row of supporting piles is completed, a reinforced concrete crown beam 6 is cast on the top of the supporting pile, and then the front and rear crown beams 6 are connected together by a connecting beam 7. In this way, the construction of the combined support structure is completed and cantilever excavation can be carried out for the foundation pit project.

[0025] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A cantilever combined foundation pit support mechanism, characterized in that: The mechanism comprises a plurality of groups of vertical support piles (1) and oblique support piles (5) for use in combination, wherein a pile side wall slot (2) is staggeredly provided on two opposite side walls of the vertical support pile (1), the two staggered pile side wall slots (2) are connected, and the oblique support pile (5) is matched to penetrate and obliquely insert into the two pile side wall slots (2); two crown beams (6) are arranged in parallel at the top ends of the plurality of groups of vertical support piles (1) and oblique support piles (5), and a plurality of connecting beams (7) are arranged in parallel between the two crown beams (6) to fix the vertical support piles (1) and the oblique support piles (5).

2. The cantilever combined foundation pit supporting mechanism according to claim 1 is characterized in that: A bottom steel plate (4) for sealing is arranged at the bottom of the vertical support pile (1).

3. The cantilever combined foundation pit supporting mechanism according to claim 1 is characterized in that: A breakable baffle (3) is provided on the pile side wall slot (2).

4. The cantilever combined foundation pit supporting mechanism according to claim 1 is characterized in that: The vertical support piles (1) are hollow square steel.

5. The cantilever combined foundation pit supporting mechanism according to claim 1 is characterized in that: The oblique supporting piles (5) are square steel or round steel.

6. A combined construction method of a cantilever combined foundation pit support mechanism according to any one of claims 1 to 5, characterized in that the method include: S1, driving vertical support piles (1), according to the location of the foundation pit, driving an appropriate number of vertical support piles (1); S2, driving the oblique support pile (5), according to the vertical support pile (1) that has been driven, driving the oblique support pile (5) obliquely at a matching angle and distance, and ensuring that the oblique support pile (5) passes through the pile side wall slot (2) and then obliquely penetrates the vertical support pile (1); S3, fixing the support piles, filling the vertical support piles (1) with micro-expansive concrete from the top to the inside, so that the vertical support piles (1) and the oblique support piles (5) are fixed together; S4, after the construction of a row of support piles is completed, a reinforced concrete cap beam (6) is poured on the top of the vertical support pile (1) and the oblique support pile (5), and then the two cap beams (6) are connected together through a connecting beam (7), thereby completing the construction of the support mechanism.

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