A method for processing a cast-in-place pile head and a quick-detachable cast-in-place pile head

Abstract

A method for processing a pile head of a cast-in-place pile and a quick-disassembly pile head cast-in-place pile, which relates to the field of water conservancy engineering, and the construction steps include: ① setting a cast-in-place pile steel bar skeleton in a cast-in-place hole; ② setting a steel bar sleeve on the vertical steel bars of the pile body, and horizontally setting a frame steel bar on the stirrup at the top of the pile body; ③ installing an empty slot template on the frame steel bar; ④ pouring concrete into the cast-in-place hole to form a pile; ⑤ setting a jack in the empty slot template, and jacking it up to form a flat seam between the pile head and the pile body; ⑥ fixing the pile head concrete through the empty slot and the flat seam in the empty slot template, and vertically separating the pile head concrete from the pile body. It is not only easy to operate and has high construction efficiency, but also can protect the safety of the steel bars and ensure the quality of the pile body.

Description

Technical Field

[0001] The invention relates to the field of water conservancy projects, and in particular to a method for processing a cast-in-place pile head and a quick-detachable cast-in-place pile head. Background Art

[0002] During the construction of pile foundation concrete, due to the sinking of the coarse aggregate concrete at the top of the bored pile, floating slurry is easy to appear. This often leads to poor strength of the pile head concrete, and the pile top elevation is not easy to control during the pouring of the bored pile. In order to ensure the strength of the pile body concrete and the pile top elevation, the existing technology usually makes the pile height higher than the design elevation when pouring the pile, and then manually chisels off the excess part to the design elevation. There is no simple and easy special processing device in the pile head chiseling construction.

[0003] The existing technology usually uses pneumatic picks for manual chiseling, grinding machines for ring cutting, or large pile head breaking equipment for breaking. After the protective layer of concrete is broken with a pneumatic pick or grinding machine, the main reinforcement must be peeled off from the side of the concrete before the pile head can be removed. The surface of the steel bar often has a threaded texture to facilitate bonding with concrete. These two methods not only have low construction efficiency, but also the pile head is often too tightly bonded to the concrete during removal, which impacts the bent steel bars and easily causes the steel bars to break under stress. Even if the steel bar does not break, it will reduce its strength due to fatigue yielding after being straightened.

[0004] In particular, when the pile head is hoisted after drilling or grooving, it is also easy to cause uneven force on the pile head and the steel bar due to the displacement of the drilling position, the pile head and the pile body or the steel bar being too tightly connected, etc., causing damage to the pile body and bending of the steel bar. At the same time, the use of large pile head breaking equipment is not only expensive, but also more harmful to the steel bar due to the strong breaking force. Summary of the invention

[0005] In order to solve the problems of low efficiency, high cost and great damage to steel bars in the above-mentioned prior art pile head treatment, the present invention provides a cast-in-place pile head treatment method and a quick-disassembly pile head cast-in-place pile, which are not only easy to operate and have high construction efficiency, but also can protect the safety of the steel bars and ensure the quality of the pile body.

[0006] The purpose of the present invention can be achieved by the following technical scheme: A method for treating a cast-in-place pile head, the construction steps comprising:

[0007] ① A matching cast-in-place pile reinforcement skeleton is arranged in the cast-in-place hole, wherein the pile body of the reinforcement skeleton includes vertical reinforcements and stirrups, and the pile head of the reinforcement skeleton includes vertical reinforcements;

[0008] ② Arrange a steel sleeve on the vertical steel bars of the pile body, and arrange a frame steel bar transversely on the stirrups at the top of the pile body, so that the frame steel bar is located between the pile head and the pile body;

[0009] ③ Installing a hollow slot template on the erected steel bar, so that the hollow slot template is arranged at the bottom of the pile head above the pile body of the cast-in-place pile, or between the pile head and the pile body of the cast-in-place pile, and the hollow slot template is centrally symmetrical with respect to the axis of the pile body;

[0010] ④ Pour concrete into the pouring hole to form a pile;

[0011] ⑤ A jack is arranged in the empty slot template, the jacking position of the jack is centrally symmetrical with respect to the axis of the pile body, and the jacking is lifted until a flat seam is formed between the pile head and the pile body;

[0012] ⑥ Fix the pile head concrete through the empty grooves and flat seams in the empty groove template to vertically separate the pile head concrete from the pile body.

[0013] Preferably, the hollow slot templates are provided with at least two groups intersecting at the axis of the pile body. The hollow slot templates are evenly distributed on the upper surface of the pile body so that the reserved through holes are evenly distributed, and lifting from the through holes helps to evenly stress the bottom surface of the pile head.

[0014] Preferably, the slot template includes an upper slot plate and a lower slot plate, and the upper slot plate and the lower slot plate are buckled relative to each other to form a through hole. More preferably, the through hole crosses the cast-in-place pile after the pile is formed. The split slot template can be preferentially separated up and down during the jacking process, promoting the further formation of the flat seam, avoiding excessive local stress between the pile head and the pile body, and the appearance of irregular cracks.

[0015] Preferably, at least two groups of jacks are provided in each group of the empty slot templates, and are symmetrically arranged at both ends of the through holes in the group of empty slot templates.

[0016] Preferably, the jack is a separate hydraulic jack. More preferably, the jack is a thin jack or an ultra-thin jack.

[0017] The present invention also provides a cast-in-place pile with a quick-detachable pile head which is constructed by adopting the above processing method.

[0018] According to the present invention, the hollow slot template is fixed by the erected steel bars in the stirrups, and the cast-in-place pile is physically pre-divided into two parts, the pile body and the pile head, and the pile head concrete is prevented from sticking by the steel bar casing. After the pile is cast, a reserved through hole is formed in the hollow slot template to avoid irregular damage to the cast-in-place pile body or lateral bending of the steel bars during later drilling. Under the lifting action of the jack, the concrete connecting the pile head and the pile body is evenly stressed and stretched to form a uniform flat seam, avoiding lateral crushing of the pile head or lateral stress on the steel bars caused by uneven lifting load, and further facilitating subsequent vertical lifting.

[0019] The comprehensive effects brought by the present invention include:

[0020] 1. The success rate of breaking the pile head in stages at one time is high. At present, the application effect of thin / ultra-thin jacks is good, and the lifting capacity meets the requirements. Through the cast-in-place pile of the present invention, a flat seam between the pile head and the pile body can be manufactured at one time.

[0021] 2. High construction efficiency. Compared with conventional processing methods such as manual pneumatic pick drilling and grinding wheel ring cutting, the present invention has fast construction speed, high efficiency and more labor-saving.

[0022] 3. The materials and equipment are simple and easy to obtain, low in cost and reusable. Compared with large pile head processing equipment, the main material of the present invention is the reserved slot template, which can be selected from conventional channel steel, I-beam or wooden board; the main tool is a thin / ultra-thin jack, which can be reused. The materials and tools are simple and low in cost.

[0023] 4. Avoid damage to the steel bars and pile concrete. Effectively protect the main reinforcement and avoid bending damage to the main reinforcement in conventional practices. Ensure that the pile concrete reaches the designed plane height and will not be accidentally damaged by the pile head treatment process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model is a schematic diagram of the internal structure of the quick-disassembly pile head cast-in-place pile used in the cast-in-place pile head processing method according to the embodiment of the present invention.

[0025] Figure 2 It is a left-side structural schematic diagram of a quick-detachable pile head cast-in-place pile used in a cast-in-place pile head processing method according to an embodiment of the present invention.

[0026] Figure 3 The diagram is a schematic top view of the structure of a quick-detachable pile head cast-in-place pile used in the cast-in-place pile head processing method according to an embodiment of the present invention.

[0027] In the drawings, the same components are denoted by the same reference numerals; the drawings are not drawn according to the actual scale. DETAILED DESCRIPTION

[0028] The present invention is further described below with reference to the accompanying drawings and embodiments.

[0029] Example 1

[0030] A method for treating the head of a cast-in-place pile, such as Figure 1-3 As shown, the construction steps include:

[0031] ① A bored pile reinforcement skeleton 2 is arranged in the cast hole 1 to match the bored pile 1, wherein the pile body of the reinforcement skeleton 2 includes vertical reinforcements 21 and stirrups 22, and the pile head of the reinforcement skeleton 2 includes vertical reinforcements 21;

[0032] ② A steel sleeve 3 is arranged on the vertical steel bars 21 of the pile body, and a frame steel bar 4 is transversely arranged on the stirrups 22 at the top of the pile body, so that the frame steel bar 4 is located between the pile head 5 and the pile body 6;

[0033] ③ Installing a slot template 7 on the erected steel bar 4, so that the slot template 7 is arranged at the bottom of the pile head 5 above the pile body 6 of the cast-in-place pile, and the slot template 7 is centrally symmetrical with respect to the axis of the pile body 6;

[0034] ④ Pour concrete into the pouring hole 1 to form a pile;

[0035] ⑤ A jack 8 is arranged in the empty slot template 7, the jacking position of the jack 8 is centrally symmetrical with respect to the axis of the pile body 6, and is jacked until a flat seam is formed between the pile head 5 and the pile body 6;

[0036] ⑥ The pile head 5 concrete is fixed by the hollow groove and flat seam in the hollow groove template 7, and the pile head 5 concrete is vertically separated from the pile body 6.

[0037] The slot templates 7 are provided with two groups intersecting at the axis of the pile body 6. The slot templates 7 are evenly distributed on the upper surface of the pile body 6 so that the reserved through holes are evenly distributed, and lifting from the through holes helps the bottom surface of the pile head 5 to be evenly stressed.

[0038] The slot template 7 includes an upper slot plate 71 and a lower slot plate 72, and the upper slot plate 71 and the lower slot plate 72 are buckled relative to each other to form a through hole. The through hole crosses the cast-in-place pile after the cast-in-place pile is formed. The split slot template 7 can be preferentially separated from top to bottom during the jacking process, promoting the further formation of the flat seam, avoiding excessive local stress between the pile head 5 and the pile body 6, and the occurrence of irregular cracks.

[0039] Two groups of jacks 8 are arranged in each group of the empty slot templates 7 , and are symmetrically arranged at the two ends of the through holes in the group of the empty slot templates 7 .

[0040] The jack 8 is a separate hydraulic jack. The jack 8 is specifically a thin jack.

[0041] In this embodiment, the cast-in-place pile with a quick-detachable pile head is constructed using the above-mentioned treatment method.

[0042] According to this embodiment, the hollow slot template 7 is fixed by the erection steel bars 4 in the stirrups, and the cast-in-place pile is physically pre-divided into two parts, the pile body 6 and the pile head 5, and the pile head 5 concrete adhesion is prevented by the steel sleeve 3. After the pile is cast, a reserved through hole is formed in the hollow slot template 7 to avoid irregular damage to the cast-in-place pile body 6 or lateral bending of the steel bars caused by drilling in the later stage. Under the lifting action of the jack 8, the concrete connecting the pile head 5 and the pile body 6 is evenly stressed and stretched to form a uniform flat seam, avoiding lateral crushing of the pile head 5 or lateral stress on the steel bars caused by uneven lifting load, and further facilitating subsequent vertical lifting.

[0043] The present invention has been described above with reference to the preferred embodiments, but the protection scope of the present invention is not limited thereto, and all technical solutions falling within the scope of the claims are within the protection scope of the present invention. Various improvements may be made to the present invention and parts thereof may be replaced with equivalents without departing from the scope of the present invention. In particular, the various technical features mentioned in the various embodiments may be combined in any manner as long as there is no structural conflict.

Claims

1. A method for treating the head of a cast-in-place pile. It is characterized in that The construction steps include: ① A matching cast-in-place pile reinforcement skeleton is arranged in the cast-in-place hole, wherein the pile body of the reinforcement skeleton includes vertical reinforcements and stirrups, and the pile head of the reinforcement skeleton includes vertical reinforcements; ② Arrange a steel sleeve on the vertical steel bars of the pile body, and arrange a frame steel bar transversely on the stirrups at the top of the pile body, so that the frame steel bar is located between the pile head and the pile body; ③ Installing a slot template on the erected steel bar, so that the slot template is arranged at the bottom of the pile head above the cast-in-place pile body, or between the pile head and the pile body of the cast-in-place pile, and the slot template is centrally symmetrical with respect to the axis of the pile body; the slot template includes an upper slot plate and a lower slot plate, and the upper slot plate and the lower slot plate are buckled relative to each other to form a through hole; the through hole crosses the cast-in-place pile after the pile is formed; ④ Pour concrete into the pouring hole to form a pile; ⑤ A jack is arranged in the empty slot template, the jacking position of the jack is centrally symmetrical with respect to the axis of the pile body, and the jacking is performed until a flat seam is formed between the pile head and the pile body; the split empty slot template can be preferentially separated up and down during the jacking process, so as to promote the further formation of the flat seam; ⑥ The pile head concrete is fixed by the hollow grooves and flat seams in the hollow groove template. The concrete is evenly stressed and stretched to break, forming a uniform flat seam, which vertically separates the pile head concrete from the pile body.

2. The processing method according to claim 1, It is characterized in that The empty slot templates are provided with at least two groups intersecting at the axis of the pile body.

3. The processing method according to claim 1, It is characterized in that At least two groups of jacks are arranged in each group of the empty slot templates, and are symmetrically arranged at the two ends of the through holes in the group of the empty slot templates.

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