Method for protecting steel bars at top of fender post

Abstract

The invention relates to the field of building construction, in particular to a fender post top steel bar protection method which comprises the steps that a first pile casing is manufactured; manufacturing a second pile casing; manufacturing a detachable base; the first pile casing and the second pile casing are inserted into the detachable base and fixed, and the pile top steel bar protection device is manufactured; a reinforcement cage used for fender post construction is lowered to the designed elevation, all steel bars in the reinforcement cage penetrate through the through holes in the detachable base, and therefore the pile top steel bar protection device is arranged at the top of the reinforcement cage in a sleeving mode and fixed; and enclosure pile concrete pouring is conducted, the pile top steel bar protection device is pulled out before initial setting of the concrete above the designed elevation of the pile top, and after the concrete reaches the designed strength, the concrete in the area outside the steel bars is broken and removed. The method is simple and easy to implement, convenient to operate and low in cost, the mechanical property and weight deviation of the exposed reinforcing steel bars can be guaranteed to a great extent, the construction efficiency is greatly improved, the construction period is greatly shortened, and meanwhile labor can be saved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a method for protecting steel bars on top of a retaining pile. Background Art

[0002] In building construction, the construction of retaining piles is very common, and the quality of retaining piles often determines the safety and durability of a single building. When the retaining pile construction is completed and the pile head is broken, most of the workers use hand-held breakers or related machinery to break the pile head concrete to expose the pile top steel bars, and then straighten the pile top steel bars manually or mechanically; the traditional method of breaking the pile head causes great damage to the pile top steel bars, and the pile top steel bars need to be straightened again, which slows the work efficiency and affects the mechanical properties of the steel bars. Summary of the invention

[0003] In view of the above problems, an embodiment of the present invention provides a method for protecting reinforcement bars at the top of a retaining pile.

[0004] A method for protecting reinforcement bars at the top of a retaining pile provided by an embodiment of the present invention comprises: Determine the pile diameter and protective layer thickness of the retaining pile according to the construction design, and determine the outer diameter of the circle formed by the steel bars in the retaining pile according to the pile diameter and protective layer thickness as the first diameter; Determine the length of the pile top reinforcement exposed after breaking the pile head, select a first steel sheet according to the first diameter and the length of the pile top reinforcement, and enclose the first steel sheet into a first casing with the same diameter as the first diameter; According to the first diameter and the diameter of the steel bars in the retaining pile, the inner diameter of the circle enclosed by the steel bars in the retaining pile is determined as the second diameter, and according to the second diameter and the length of the steel bars at the top of the pile, a second steel sheet is selected, and the second steel sheet is enclosed to form a second casing with the same diameter as the second diameter; A detachable base is manufactured according to the first diameter, the second diameter, and the diameter and number of the steel bars in the retaining pile. The detachable base includes a bottom plate of a circular ring, a through hole is opened on the bottom plate corresponding to the steel bars in the retaining pile, and baffles are vertically arranged at the inner ring and the outer ring of the bottom plate; Insert the first casing and the second casing into the detachable base and fix them to form a pile top reinforcement protection device, wherein the first casing is tightly attached to the baffle plate at the outer ring of the detachable base, and the second casing is tightly attached to the baffle plate at the inner ring of the detachable base; Lower the steel cage used for the construction of the retaining pile to the designed elevation, insert each steel bar in the steel cage through the through hole in the detachable base, and then put the pile top steel bar protection device on the top of the steel cage and fix it; Pour the concrete of the retaining piles and pull out the steel bar protection device on the pile top before the concrete begins to set above the designed elevation of the pile top. After the concrete reaches the designed strength, break the concrete in the area outside the steel bars.

[0005] Compared with the prior art, the beneficial effects of the present invention are: simple and easy, convenient to operate, low cost, can guarantee the mechanical properties and weight deviation of the exposed steel bars to a great extent, greatly improve construction efficiency and shorten construction period, and save labor.

[0006] Optionally, the pile top reinforcement protection device further includes a detachable top surface, and the detachable top surface structure is the same as the detachable base structure except that the through-hole structure is eliminated.

[0007] Optionally, a carrying ring is provided on the detachable top surface.

[0008] Optionally, before the pile top steel bar protection device is sleeved on the top of the steel bar cage, a release agent is applied to the inner and outer sides of the pile top steel bar protection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] The drawings described herein are used to provide a further understanding of the present invention, constitute a part of the present application, and do not constitute a limitation of the present invention. In the drawings: Figure 1 A schematic diagram of a pile top reinforcement protection device provided by an embodiment of the present invention Figure 1 ; Figure 2 A schematic diagram of a pile top reinforcement protection device provided by an embodiment of the present invention Figure 2 ; Figure 3 A schematic cross-sectional structure diagram of a pile top reinforcement protection device provided in an embodiment of the present invention.

[0010] Among them, 1. first protective tube; 2. second protective tube; 3. detachable base; 4. through hole; 5. detachable top surface; 6. carrying ring. DETAILED DESCRIPTION

[0011] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments and the accompanying drawings. Here, the illustrative embodiments of the present invention and their descriptions are used to explain the present invention, but are not intended to limit the present invention.

[0012] See also Figure 1-Figure 3 , a method for protecting reinforcement bars at the top of a retaining pile provided by an embodiment of the present invention comprises: Step 1: Determine the pile diameter and protective layer thickness of the retaining pile according to the construction design, and determine the outer diameter of the circle formed by the steel bars in the retaining pile as the first diameter according to the pile diameter and protective layer thickness; the first diameter is the pile diameter minus 2 times the protective layer thickness; Step 2: determine the length of the pile top steel bar exposed after breaking the pile head, select a first steel sheet according to the first diameter and the length of the pile top steel bar, and enclose the first steel sheet into a first casing 1 with the same diameter as the first diameter; Step 3: Determine the inner diameter of the circle enclosed by the steel bars in the retaining pile as the second diameter according to the first diameter and the diameter of the steel bars in the retaining pile, select a second steel sheet according to the second diameter and the length of the steel bars at the top of the pile, and enclose the second steel sheet into a second casing 2 with the same second diameter; the second diameter is the first diameter minus 2 times the steel bar diameter; the height of the steel sheet is not less than the length of the steel bars at the top of the pile; Step 4: According to the first diameter, the second diameter, and the diameter and number of the steel bars in the retaining pile, a detachable base 3 is manufactured. The detachable base 3 comprises a bottom plate of a circular ring, a through hole 4 is opened on the bottom plate and is opposite to the steel bars in the retaining pile, and baffles are vertically arranged at the inner ring and the outer ring of the bottom plate; Step 5, insert the first casing 1 and the second casing 2 into the detachable base 3 and fix them. The fixing method can be bolted to make a pile top reinforcement protection device. During the manufacturing process, the first casing 1 is tightly attached to the baffle at the outer ring of the detachable base 3, and the second casing 2 is tightly attached to the baffle at the inner ring of the detachable base 3; Step 6: Lower the steel cage used for the construction of the retaining pile to the designed elevation, insert each steel bar in the steel cage through the through hole 4 in the detachable base 3, and then sleeve the pile top steel bar protection device on the top of the steel cage and fix it; Step 7: Pour the concrete for the retaining piles and pull out the steel bar protection device on the pile top before the concrete begins to set above the designed elevation of the pile top. After the concrete reaches the designed strength, break the concrete outside the steel bar area.

[0013] In practice, the pile top steel bar protection device also includes a detachable top surface 5, which is fixedly mounted on the first casing 1 and the second casing 2. The structure of the detachable top surface 5 is the same as that of the detachable base 3, except that the through hole 4 structure is eliminated.

[0014] In practice, a carrying ring 6 is provided on the detachable top surface 5 .

[0015] During implementation, before the pile top steel bar protection device is put on the top of the steel bar cage, a release agent is applied to the inner and outer sides of the pile top steel bar protection device to facilitate removal.

[0016] The solution provided by the embodiment of the present invention utilizes the pile top steel bar protection device to isolate the retaining pile steel bars from the concrete, thereby preventing the steel bars from being stressed when the pile head is broken at a later stage. There is no need to straighten the steel bars, which is simple and easy to implement, convenient to operate, and low in cost. It can guarantee the mechanical properties and weight deviation of the exposed steel bars to a great extent, greatly improve construction efficiency, shorten construction period, and save labor.

[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.

Claims

1. A method for protecting the top reinforcement of a retaining pile, characterized in that: include: Determine the pile diameter and protective layer thickness of the retaining pile according to the construction design, and determine the outer diameter of the circle formed by the steel bars in the retaining pile according to the pile diameter and protective layer thickness as the first diameter; Determine the length of the pile top reinforcement exposed after breaking the pile head, select a first steel sheet according to the first diameter and the length of the pile top reinforcement, and enclose the first steel sheet into a first casing with the same diameter as the first diameter; According to the first diameter and the diameter of the steel bars in the retaining pile, the inner diameter of the circle enclosed by the steel bars in the retaining pile is determined as the second diameter, and according to the second diameter and the length of the steel bars at the top of the pile, a second steel sheet is selected, and the second steel sheet is enclosed to form a second casing with the same diameter as the second diameter; A detachable base is manufactured according to the first diameter, the second diameter, and the diameter and number of the steel bars in the retaining pile. The detachable base includes a bottom plate of a circular ring, a through hole is opened on the bottom plate corresponding to the steel bars in the retaining pile, and baffles are vertically arranged at the inner ring and the outer ring of the bottom plate; Insert the first casing and the second casing into the detachable base and fix them to form a pile top reinforcement protection device, wherein the first casing is tightly attached to the baffle plate at the outer ring of the detachable base, and the second casing is tightly attached to the baffle plate at the inner ring of the detachable base; Lower the steel cage used for the construction of the retaining pile to the designed elevation, insert each steel bar in the steel cage through the through hole in the detachable base, and then put the pile top steel bar protection device on the top of the steel cage and fix it; Pour the concrete of the retaining piles and pull out the steel bar protection device on the pile top before the concrete begins to set above the designed elevation of the pile top. After the concrete reaches the designed strength, break the concrete in the area outside the steel bars.

2. The method for protecting the reinforcement bars at the top of the retaining pile according to claim 1, characterized in that: The pile top reinforcement protection device also includes a detachable top surface, and the detachable top surface structure is the same as the detachable base structure, and the only difference is that the through hole structure is eliminated.

3. The method for protecting the reinforcement bars at the top of the retaining pile according to claim 2, characterized in that: A carrying loop is provided on the detachable top surface.

4. The method for protecting the reinforcement bars at the top of the retaining pile according to claim 2, characterized in that: Before the pile top steel bar protection device is put on the top of the steel cage, a release agent is applied to the inner and outer sides of the pile top steel bar protection device.

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