Novel connecting device for enclosing purlin and support pile

Abstract

The utility model provides a novel connecting device for an enclosing purlin and a support pile, which relates to the technical field of deep foundation pit construction and comprises an arc-shaped anchor plate, one side face of the arc-shaped anchor plate is connected with the support pile through double-limb shear-resistant profile steel, and the other side face of the arc-shaped anchor plate is connected with the enclosing purlin through a shear-resistant bracket. The supporting piles and the enclosing purlins are rigidly connected through the connecting devices, the foundation pit is small in deformation, safe and reliable, the influence on later-stage support disassembling is small, and engineering propulsion 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 surrounding purlin and a supporting pile. Background Art

[0002] With the development of science and technology and the acceleration of urbanization, underground space has been paid more and more attention by people. As underground space is continuously excavated, 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 to build deep foundation pits in sequence. Support piles plus water-stop curtains and reinforced concrete supports 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 support beam layers also increases. In order to ensure the integrity of the support system and the safety of the foundation pit, the support beams need to be reliably connected to the support piles. Usually, the support piles transfer the force of the foundation pit excavation shrinkage deformation to the support beams through the purlins, which offsets the horizontal axial force of the support beams, reduces the deformation of the foundation pit, and ensures the stability of the foundation pit. As the main load-bearing component, the purlin has a relatively large cross-section and has a certain weight. The quality of the connection between the purlin and the support piles has a great impact on the safety of the foundation pit support system.

[0003] Currently, there are two common ways to connect purlins and support piles: the first is to plant reinforcement at the corresponding support pile position within the purlin height range, and the shear force between the purlin and the support pile is offset by the reinforcement of the planted reinforcement. However, the depth of the planted reinforcement on site is difficult to achieve, and the cleaning may not be in place, making it difficult to ensure the quality of the planted reinforcement; the second is to use hanging bars to reliably connect the support piles and purlins, chisel out the protective layer of the support pile reinforcement at the purlin area, and weld hanging bars to the protective layer of the support pile reinforcement above the purlin, and use the hanging bars to offset the shear force between the purlin and the support pile. 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 removal of the support beams. 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 purlin and a supporting pile.

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

[0006] Preferably, the arc-shaped anchor plate is made of Q355B steel.

[0007] Preferably, the double-limb shear-resistant steel is made of two longitudinal I-beams, and the double-limb 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 corbels are made of transverse I-steel, and both ends of the shear corbels are respectively welded to the arc-shaped anchor plate and the surrounding purlin.

[0009] Preferably, the surrounding purlin is provided with duck tendons.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention proposes a new connection device for purlins and supporting piles, and the purlins and supporting piles are connected by double-legged shear steel and arc-shaped anchor plates, which are easy to operate, have high steel component strength, and are highly reliable. During the early stage of supporting pile construction, the double-legged shear steel and arc-shaped anchor plates are lowered into the pile holes together with the steel cage of the supporting piles, and are formed together with the supporting 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. The shear corbels and purlins are connected and cast in one step, and the quality of the welds can be inspected, the quality is relatively easy to control, and the operation is convenient. The supporting piles and purlins are rigidly connected by the connection device, the deformation of the foundation pit is small, it is safe and reliable, and has little impact on the later dismantling of the support, which is conducive to the advancement of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 This is a schematic diagram of the connection between the arc-shaped anchor plate and the double-limb shear steel in an embodiment of the present utility model.

[0012] 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.

[0013] Figure 3 It is a schematic diagram of the construction of duck tendons in an embodiment of the present utility model.

[0014] In the figure, 1. Support piles; 2. Double-leg shear steel; 3. Arc anchor plate; 4. Shear corbel; 5. Duck tendon. DETAILED DESCRIPTION

[0015] 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.

[0016] Example: Figure 1-Figure 3 As shown, a new connection device for a perimeter purlin and a supporting pile comprises an arc-shaped anchor plate 3, one side of the arc-shaped anchor plate 3 is connected to the supporting pile 1 via a double-leg shear steel 2, and the other side of the arc-shaped anchor plate 3 is connected to the perimeter purlin via a shear corbel 4. The double-leg shear steel 2 adopts two longitudinal I-beams, and the shear corbel 4 adopts a transverse I-beam.

[0017] The construction method of the novel connection device of the purlin and the supporting pile comprises the following steps:

[0018] Step 1: Based on the load-bearing structure between the purlin and support piles 1 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 brackets 4, double-leg shear steel 2, and curved anchor plates 3 are all made of Q355B steel. After the detailed design determines the dimensions, they are confirmed by the original design company.

[0019] 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 3 is determined according to the diameter of the support pile 1 to ensure that the curved anchor plate 3 can fit tightly with the reinforcement cage of the support pile 1. The double-leg shear steel 2 on the inner side of the support pile 1 is fully welded to the curved anchor plate 3, and flaw detection is carried out. The shear corbel 4 is processed into place according to the size.

[0020] Step 3: Determine the position and elevation of the new connection device based on the purlin height on the support drawing. The horizontal centerline of the new connection device should be aligned with the horizontal center of the purlin to ensure effective connection later. During the construction of support pile 1, determine the corresponding steel cage position based on the purlin elevation and mark it. During the construction of support pile 1, after the hole is completed and before the reinforcement is lowered, the curved anchor plate 3 is firmly welded to the steel cage of support pile 1 at the corresponding position. It is then lowered along with the steel cage, and support pile 1 is then constructed normally.

[0021] Step 4: Excavation is carried out according to the project schedule. During the construction of the purlin, based on the purlin center position and the corresponding position of the pre-embedded support pile 1 of the new connection device, an electric pick is used to remove the plain concrete on the curved anchor plate 3, completely exposing the curved anchor plate 3. The plate is then cleaned and the matching shear bracket 4 is welded firmly to form a whole. After passing the flaw detection test, the next construction process is carried out. Duck tendons 5 are added during the purlin construction reinforcement binding. The purlin is then constructed normally. After the concrete is poured, the purlin and support pile 1 are integrated through the new connection device to form an effective connection.

[0022] 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 novel connection device between a purlin and a supporting pile, characterized in that: It comprises an arc-shaped anchor plate, one side of which is connected to the supporting pile through a double-limb shear-resistant steel, and the other side of which is connected to the surrounding purlin through a shear-resistant corbel.

2. The novel connection device between the purlin and the supporting pile according to claim 1 is characterized in that: The arc-shaped anchor plate is made of Q355B steel.

3. The novel connection device between the purlin and the supporting pile according to claim 1 or 2, characterized in that: The double-limb shear-resistant steel adopts two longitudinal I-steels, and the double-limb shear-resistant steel 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 purlin and the supporting pile 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 surrounding purlin.

5. The novel connection device between the purlin and the supporting pile according to claim 1 or 2, characterized in that: The surrounding purlin is provided with duck tendons.

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