Steel casing for improving strength of pile foundation

Abstract

The utility model discloses a steel casing for improving pile foundation strength and relates to a concrete pile foundation. According to the steel casing capable of improving the strength of the pile foundation, the upper end of the steel casing is connected with a reinforced concrete bearing platform, and the steel casing is characterized in that stiffening rings, connecting steel bars and the reinforcing rings are welded to the steel casing, and the stiffening rings are welded to the inner wall of the steel casing from top to bottom at equal intervals; the connecting steel bars are vertically welded to the inner wall of an upper opening of the steel casing at equal intervals, and the reinforcing ring is horizontally welded to the outer wall of the upper opening of the steel casing. According to the steel casing capable of improving the strength of the pile foundation, the stiffening ring is welded in the steel casing to reinforce the connectivity with the pile foundation concrete, and the connecting reinforcing steel bar is welded on the upper portion of the steel casing to reinforce the connection with the bearing platform concrete, so that after the steel casing, the pile foundation and the bearing platform are tightly connected, the steel casing, the pile foundation and the bearing platform are stressed together to improve the strength of the pile foundation. The pile foundation size is effectively reduced, and the construction cost is reduced.

Description

Technical Field

[0001] The utility model relates to a concrete pile foundation, in particular to a steel casing which strengthens the connection with the cap concrete so that the steel casing, the pile foundation and the cap are closely connected and subjected to stress together, thereby improving the strength of the pile foundation. Background Art

[0002] Pile foundation steel casing is generally used in the case of poor geological conditions, where the hole wall collapses easily during the drilling process. The steel casing passes through the easily collapsed hole soil layer to ensure the stability of the hole wall. The cost of steel casing is high. There is no measure to strengthen the connection between the traditional steel casing and the pile foundation and the cap. It cannot be combined with the pile foundation and the cap to bear force. It can only be used as a measure to ensure the stability of the hole wall during the pile foundation drilling process, and the economic efficiency is poor. Summary of the invention

[0003] The utility model aims to solve the existing problems of pile foundation steel casings, and provides a steel casing that strengthens the connection with the cap concrete, so that the steel casing, the pile foundation and the cap are tightly connected and subjected to force together, thereby improving the strength of the pile foundation.

[0004] The utility model provides a steel casing for improving the strength of pile foundations, the upper end of the steel casing is connected to a reinforced concrete cap, and is characterized in that a stiffening ring, connecting steel bars and a stiffening ring are welded on the steel casing, a plurality of stiffening rings are welded to the inner wall of the steel casing at equal intervals from top to bottom, a plurality of connecting steel bars are vertically welded to the inner wall of the upper opening of the steel casing at equal intervals, and the stiffening ring is horizontally welded to the outer wall of the upper opening of the steel casing.

[0005] A cap cushion layer is provided at the bottom of the reinforced concrete cap. The cap cushion layer is in a circular ring shape and is horizontally sleeved on the upper outer edge of the steel casing, located below the reinforcement ring and not lower than the lowest end of the connecting steel bars; a reinforced concrete cap is cast on the cap cushion layer, and the connecting steel bars are wrapped in the reinforced concrete cap.

[0006] A pressure-bearing steel mesh is also arranged on the top of the steel casing, and the pressure-bearing steel mesh is located inside the reinforced concrete cap.

[0007] Concrete is poured into the steel casing to form pile foundation concrete.

[0008] The utility model provides a steel casing for improving the strength of pile foundation. A stiffening ring is welded in the steel casing to strengthen the connection with the pile foundation concrete. The connection with the cap concrete is strengthened by connecting steel bars welded on the upper part of the steel casing. After the steel casing, the pile foundation and the cap are tightly connected, the three are subjected to force together to improve the strength of the pile foundation, effectively reduce the size of the pile foundation and reduce the construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 It is a schematic diagram of the steel casing structure.

[0010] Figure 2 It is a cross-sectional view of the top of the steel casing.

[0011] Figure 3 It is a cross-sectional view of the steel casing stiffening ring.

[0012] Figure 4 This is a large-scale drawing of the top of the steel casing.

[0013] Figure 5 It is a schematic diagram of the connection between the steel casing and the reinforced concrete cap.

[0014] In the figure, there are steel casing 1, stiffening ring 2, connecting steel bars 3, reinforcing ring 4, pile foundation concrete 5, pedestal cushion 6, reinforced concrete pedestal 7, and pressure-bearing steel mesh 8. DETAILED DESCRIPTION

[0015] Embodiment 1: A steel casing for improving the strength of a pile foundation, wherein the upper end of the steel casing is connected to a reinforced concrete cap, and a stiffening ring, connecting steel bars and a stiffening ring are welded to the steel casing, and several stiffening rings are welded to the inner wall of the steel casing at equal intervals from top to bottom, and several connecting steel bars are vertically welded to the inner wall at the upper opening of the steel casing at equal intervals, and the stiffening ring is horizontally welded to the outer wall at the upper opening of the steel casing. A cap cushion is provided at the bottom of the reinforced concrete cap, and the cap cushion is in the shape of a circular ring, horizontally sleeved on the upper outer edge of the steel casing, located below the stiffening ring, and not lower than the lowest end of the connecting steel bar; a reinforced concrete cap is cast on the cap cushion, and the connecting steel bar is wrapped in the reinforced concrete cap. A pressure-bearing steel mesh is also provided on the top of the steel casing, and the pressure-bearing steel mesh is located inside the reinforced concrete cap. Concrete is poured in the steel casing to form pile foundation concrete.

[0016] Stiffening rings are welded in the steel casing to strengthen the connection with the pile foundation concrete. The connecting steel bars welded on the upper part of the steel casing are used to strengthen the connection with the cap concrete. After the steel casing, pile foundation and cap are tightly connected, the three are subjected to force together to improve the strength of the pile foundation.

Claims

1. A steel casing for improving the strength of pile foundation, wherein the upper end of the steel casing is connected to a reinforced concrete cap, characterized in that The steel casing is welded with stiffening rings, connecting steel bars and stiffening rings. Several stiffening rings are welded at equal intervals on the inner wall of the steel casing from top to bottom, several connecting steel bars are vertically welded at equal intervals on the inner wall of the upper opening of the steel casing, and the stiffening rings are horizontally welded on the outer wall of the upper opening of the steel casing.

2. The steel casing for improving pile foundation strength as claimed in claim 1, characterized in that A cap cushion layer is provided at the bottom of the reinforced concrete cap. The cap cushion layer is in a circular ring shape and is horizontally sleeved on the upper outer edge of the steel casing, located below the reinforcement ring and not lower than the lowest end of the connecting steel bars; a reinforced concrete cap is cast on the cap cushion layer, and the connecting steel bars are wrapped in the reinforced concrete cap.

3. The steel casing for improving pile foundation strength according to claim 1, characterized in that A pressure-bearing steel mesh is also arranged on the top of the steel casing, and the pressure-bearing steel mesh is located inside the reinforced concrete cap.

4. The steel casing for improving pile foundation strength according to claim 1, characterized in that Concrete is poured into the steel casing to form pile foundation concrete.

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