Novel connecting device for bottom plate and support pile

Abstract

The utility model provides a novel connecting device for a bottom plate and a support pile, which relates to the technical field of deep foundation pit construction and comprises an arc-shaped anchor plate, one side surface of the arc-shaped anchor plate is connected with the support pile through shear-resistant profile steel, and the other side surface of the arc-shaped anchor plate is connected with the bottom plate through a shear-resistant bracket. The supporting pile and the bottom plate are rigidly connected through the connecting device, the foundation pit is small in deformation, safe and reliable, stress release deformation on the periphery of the foundation pit in the later period is small, and engineering promotion is facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of deep foundation pit construction, in particular to a novel connecting device for a bottom plate and a supporting pile. Background Art

[0002] With the development of science and technology and the acceleration of urbanization, underground space has been increasingly valued by people. With the continuous excavation of underground space, deep foundation pit projects are becoming more and more common in existing engineering fields. The commonly used construction method for deep foundation pit projects is the reverse construction of deep foundation pits. Pile-wall combined with a guard pile plus a water-stop curtain and an integrated structural plate in the pit are commonly used support systems. In the existing support system, as the depth of the foundation pit continues to deepen, the number of basement floors also increases. To ensure the integrity of the support system and the safety of the foundation pit, the foundation slab needs to be reliably connected to the pile-wall combined with a guard pile. Usually, after the support piles are excavated to the base, the force of the foundation pit excavation shrinkage deformation is transmitted to the foundation slab through the connection between the slab and the support piles, which offsets the horizontal pressure of the foundation slab, reduces the deformation of the foundation pit, and ensures the stability of the foundation pit. As the main load-bearing component, the connection quality between the foundation slab and the support piles has a great impact on the safety of the foundation pit support system.

[0003] Currently, there are two common methods for connecting foundations and pile walls with supporting piles: the first is to plant reinforcement at the corresponding supporting pile positions within the base plate height range. The shear force between the base plate and the supporting piles is offset by the rebar of the planted reinforcement. However, the depth of rebar planting on site is difficult to achieve, and cleaning may not be in place, making it difficult to ensure the quality of the planted reinforcement; the second is to reserve connectors within the base plate range of the supporting piles, which are later connected to the base plate reinforcement. However, the pre-embedded height is usually difficult to control and difficult to connect to the base plate reinforcement, or the protection is not in place and cannot be used in the concrete slurry later. Currently, these two methods are relatively cumbersome to operate, waste manpower, and are difficult to ensure quality. They also bring certain difficulties to the later base plate construction. How to solve this problem efficiently, quickly and reliably based on these two methods has become an urgent problem to be solved. Summary of the Invention

[0004] In view of the above-mentioned prior art, the present invention proposes a novel connection device between a base plate and a supporting pile.

[0005] The utility model provides a novel connection device between a base plate and a supporting pile, comprising an arc-shaped anchor plate, one side of which is connected to the supporting pile via a shear-resistant steel, and the other side of which is connected to the base plate via a shear-resistant corbel.

[0006] Preferably, the arc-shaped anchor plate is made of Q355B steel and has a thickness of 20 mm.

[0007] Preferably, the shear-resistant steel is a longitudinal I-steel, and the shear-resistant steel is arranged on the inner side of the supporting pile and is welded to the arc-shaped anchor plate.

[0008] Preferably, the shear corbel is made of a transverse I-steel, and both ends of the shear corbel are respectively welded to the arc-shaped anchor plate and the bottom plate.

[0009] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention proposes a new connection device between the base plate and the support piles, and the base plate and the support piles are connected by shear-resistant steel and arc-shaped anchor plates, which is easy to operate, and the steel components are high in strength and highly reliable. During the early stage of the support pile construction, the shear-resistant steel and the arc-shaped anchor plates are lowered into the pile holes together with the support pile reinforcement cage, and are formed together with the support piles, resulting in a better connection effect. In the later stage, the protective layer on the arc-shaped anchor plate is chiseled off, and the shear corbels are welded to the arc-shaped anchor plates, and the shear corbels and the surrounding purlins are connected and cast in one step. The quality of the welds can be inspected, the quality is relatively easy to control, and the operation is convenient. The support piles and the base plate are rigidly connected by the connection device, the deformation of the foundation pit is small, it is safe and reliable, and the stress release deformation around the foundation pit in the later stage is small, which is conducive to the advancement of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of the connection between the arc-shaped anchor plate and the shear-resistant steel in an embodiment of the present utility model.

[0011] Figure 2 This is a schematic diagram of the connection between the arc anchor plate and the shear corbel in an embodiment of the present utility model.

[0012] In the figure, 1. Shear corbel; 2. Arc anchor plate; 3. Support pile; 4. Shear steel. DETAILED DESCRIPTION

[0013] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific embodiments.

[0014] Example: Figure 1-Figure 2 As shown, a new type of connection device between the base plate and the support pile includes a curved anchor plate 2, one side of the curved anchor plate 2 is welded to the support pile 3 through a shear steel 4, and the other side of the curved anchor plate 2 is welded to the base plate through a shear corbel 1. The shear steel 4 adopts a longitudinal I-beam, and the shear corbel 1 adopts a transverse I-beam.

[0015] The construction method of the novel connection device between the base plate and the supporting piles comprises the following steps:

[0016] Step 1: Based on the load-bearing structure between the base plate and support piles 3 and the design intent of the support design institute, the design team conducts detailed design of the steel components as needed to meet the load requirements and ensure the safety of the foundation pit. Shear bracket 1, shear steel 4, and curved anchor plate 2 are all made of Q355B steel. The thickness of the curved anchor plate 2 is 20 mm. After the detailed design determines the dimensions, they will be confirmed by the original design company.

[0017] Step 2: The steel processing yard uses the appropriate raw materials as needed, and processing can only begin after they pass inspection and retesting. The curvature of the curved anchor plate 2 is determined according to the diameter of the support pile 3 to ensure that the curved anchor plate 2 can fit tightly with the reinforcement cage of the support pile 3. The shear steel 4 on the inside of the support pile 3 is welded to the curved anchor plate 2 through full penetration welding. After flaw detection, the shear corbel 1 is processed to the required dimensions.

[0018] Step 3: Determine the position and elevation of the new connection device based on the base plate height on the support drawing. The horizontal centerline of the new connection device should be aligned with the horizontal center of the base plate to ensure effective connection later. During the construction of support pile 3, determine the corresponding steel cage position based on the base plate elevation and mark it. During the construction of support pile 3, after the hole is completed and before the reinforcement is lowered, the curved anchor plate 2 is firmly welded to the steel cage of support pile 3 at the corresponding position and lowered together with the steel cage. Support pile 3 is then constructed normally.

[0019] Step 4: Excavation is carried out according to the project schedule. During baseplate construction, based on the baseplate center position and the corresponding position of the pre-embedded support piles 3 of the new connection device, an electric pick is used to remove the plain concrete on the curved anchor plate 2, completely exposing the curved anchor plate 2. The plate is then cleaned and the matching shear bracket 1 is welded firmly to form a single unit. After passing the flaw detection test, the next construction process is carried out. The baseplate is then constructed normally. After the concrete is poured, the baseplate and support piles 3 are integrated and effectively connected using the new connection device.

[0020] The above is only an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent scheme made using the contents of the present invention specification, directly or indirectly used in other related technical fields, is also within the patent protection scope of the present invention.

Claims

1. A new type of connection device between base plate and support pile, characterized in that: It comprises an arc-shaped anchor plate, one side of which is connected to the supporting pile through shear-resistant steel, and the other side of which is connected to the bottom plate through a shear-resistant corbel.

2. The novel connection device between the base plate and the supporting piles according to claim 1 is characterized in that: The arc-shaped anchor plate is made of Q355B steel and has a thickness of 20 mm.

3. The novel connection device between the base plate and the supporting piles according to claim 1 or 2, characterized in that: The shear-resistant steel is a longitudinal I-steel, which is arranged on the inner side of the supporting pile and is welded to the arc-shaped anchor plate.

4. The novel connection device between the base plate and the supporting piles according to claim 1 or 2, characterized in that: The shear corbel adopts a transverse I-steel, and the two ends of the shear corbel are respectively welded to the arc anchor plate and the bottom plate.

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