A construction method for prefabricated pile anti-deflection reinforced cushion in soft soil areas

Abstract

The present invention discloses a construction method for a precast pile anti-deviation reinforced cushion layer in a soft soil area, comprising a precast pile anti-deviation reinforced cushion layer in a soft soil area, wherein the reinforced cushion layer comprises a reinforced concrete cushion layer and a precast pile; an angle steel fixing piece is provided on the reinforced concrete cushion layer, and an angle steel fixing bolt is provided on the angle steel fixing piece; a pile top steel cover plate is provided on the precast pile, and the precast pile and the pile top steel cover plate are connected by high-strength bolts; the reinforced concrete cushion layer and the precast pile are connected together by the angle steel fixing piece, the pile top steel cover plate, the angle steel fixing bolt and the high-strength bolt to form a whole. The method effectively prevents the pile body from tilting and damaging due to uneven soil pressure, which affects the safety and progress of the project. The column top reinforced steel cover plate and the angle steel fixing piece are both connected by bolts. The pile top steel cover plate and the angle steel fixing piece can be removed by simply removing the bolts, making subsequent removal convenient and quick. The angle steel connector, the pile top cover plate and the bolts can be reused, reducing costs.

Description

Technical Field

[0001] The invention relates to the technical field of precast pile anti-deviation, in particular to a construction method of a precast pile anti-deviation reinforced cushion layer in soft soil areas. Background Art

[0002] The main types of precast piles are solid square piles, hollow square piles, and pipe piles. Precast piles are prefabricated in factories and can be transported to the site for construction, which can greatly shorten the construction period. Because precast piles are made in factories, their quality is guaranteed, the pile body is strong, the bearing capacity is strong, and they are more economical. However, during construction in soft soil areas, piles are generally driven first, and then the basement is excavated. Since soft soil areas are mostly silty soil in a plastic state, improper excavation sequence or construction disturbance can easily cause bending damage to the pile body. In view of this, the present application utilizes a prefabricated reinforced cushion layer to be connected and fixed to the top of the precast pile in advance to prevent the concrete pipe pile from having top deviation, tilting, or broken piles.

[0003] Therefore, the applicant, based on many years of rich experience in design, development and actual production in the relevant industry, has conducted research and improvements on the existing structures and deficiencies, and provided a construction method for precast pile anti-displacement reinforced cushion layers in soft soil areas, in order to achieve a more practical purpose. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In view of the shortcomings of the existing technology, the present invention provides a construction method for a precast pile anti-deflection reinforced cushion layer in soft soil areas, which solves the problems of top deviation, tilting or broken piles of concrete pipe piles.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention is implemented through the following technical solutions: a construction method for a precast pile anti-deflection reinforced cushion layer in a soft soil area, comprising a precast pile anti-deflection reinforced cushion layer in a soft soil area, wherein the reinforced cushion layer comprises a reinforced concrete cushion layer and a precast pile; an angle steel fixing piece is provided on the reinforced concrete cushion layer, and an angle steel fixing bolt is provided on the angle steel fixing piece; a pile top steel cover plate is provided on the precast pile, and the precast pile and the pile top steel cover plate are connected by high-strength bolts;

[0008] The reinforced concrete cushion layer and the precast pile are connected together by angle steel fixing pieces, pile top steel cover plates, angle steel fixing bolts and high-strength bolts to form a whole;

[0009] The specific operations are as follows:

[0010] S1: The reinforced concrete cushion is a rectangular precast concrete cushion with a single-layer bidirectional steel mesh. The central opening of the reinforced concrete cushion is slightly larger than the sum of the diameter (or side length) of the precast pile and the height of the angle steel fixing member. Two angle steel fixing bolts are reserved on each side of the reinforced concrete cushion at orthogonal positions. The angle steel fixing bolts are embedded in the reinforced concrete cushion through embedded plates.

[0011] S2: The angle steel fixing piece is welded into an L shape by equal-leg angle steel. When the angle steel fixing piece is connected to the reinforced concrete cushion layer, the position of the angle steel fixing piece is adjusted through the oblong hole on the angle steel fixing piece to ensure that the four angle steel fixing pieces hold the precast pile tightly and do not shake.

[0012] S3: Four bolt holes are reserved at the top of the precast pile. A circular steel cover is used for the pile top. Four holes are reserved at the positions corresponding to the bolt holes on the pile top. The circular steel cover is connected and fixed to the top of the precast pile by four high-strength bolts. The size of the steel cover should ensure that it can completely press the vertical angle steel section of the angle steel fixing. The high-strength bolts connected to the steel cover are tightened so that the steel cover exerts a preload on the angle steel fixing. The preload is transmitted to the reinforced concrete cushion through the angle steel fixing, so that the reinforced concrete cushion is in close contact with the soil. The soil provides support to the reinforced concrete cushion to prevent the precast pile from tilting.

[0013] S4: After the precast pile anti-deflection reinforcement device is in place, the gaps between the reinforced cushion layers of each precast pile are connected into a whole with a cast-in-place concrete cushion layer. After the cushion layer is connected as a whole and the strength reaches the design requirements, the high-strength bolts, pile top steel cover plates, angle steel fixing bolts and angle steel fixings connected to the top of the precast pile are successively removed and recycled. After removal, the hole in the middle of the precast reinforced cushion layer is immediately poured with cast-in-place concrete to connect the cushion layer and the pile into a whole.

[0014] Preferably, the reinforced concrete cushion layer is a prefabricated reinforced concrete component with a single-layer bidirectional steel mesh inside. Its shape is rectangular, and the size of the rectangle is the pile spacing minus the width of the post-casting area, which is 300mm wide. A hole is reserved in the middle of the reinforced concrete cushion layer. The size of the reserved hole is the sum of the diameter (or side length) of the prefabricated pile and the height of the angle steel fixing piece. The adjustable gap is 50mm.

[0015] Preferably, the angle steel fixing piece is made into an L-shaped component by welding equal-leg angle steels, the flat side of the L-shaped angle steel fixing piece is fixed to the reinforced concrete cushion layer by bolts, and an oblong hole is provided on the angle steel limb of the flat side of the L-shaped fixing piece.

[0016] Preferably, the pile top steel cover plate adopts a circular steel cover plate, and four bolt holes are reserved in the circular steel cover plate at orthogonal positions. The diameter of the circular pile top steel cover plate is the sum of the prefabricated pile diameter (or side length) and the height of the angle steel fixing piece.

[0017] Preferably, the pile top steel cover plate is connected to the top of the precast pile by high-strength bolts. The pile top steel cover plate is tightly connected to the angle steel fixing piece through the tightening force of the high-strength bolts. The angle steel fixing piece presses the reinforced concrete cushion layer to provide reliable anti-lateral and anti-tilt support for the precast pile.

[0018] (3) Beneficial effects

[0019] The present invention provides a construction method for precast piles with reinforced cushions to prevent misalignment in soft soil areas. This method effectively prevents the pile from tilting and damaging due to uneven soil pressure, which could affect project safety and progress. The column top reinforcement steel cover and angle steel fixings are all bolted together. Simply removing the bolts allows for easy and quick removal of the pile top steel cover and angle steel fixings. The angle steel connectors, pile top cover, and bolts are reusable, reducing costs.

[0020] (1) The main function of the reinforced concrete cushion layer is to add an enlarged pile cap on the top of the precast pile. When the precast pile has a tendency to tilt, the reinforced cushion layer on the tilting side can transmit the tilting force to the soil at its bottom, that is, the tilting effect is resisted and resolved by the pressure of the soil, so as to achieve the purpose of preventing the precast pile from tilting;

[0021] (2) A single layer of bidirectional steel bars is arranged in the reinforced cushion layer; space is left in the middle of the reinforced cushion layer for the pile and angle steel, and a certain gap is left for installation; the angle steel and the reinforced cushion layer are connected by pre-buried bolts, and oblong holes are used at the connection between the angle steel and the bolts to facilitate adjustment; the prefabricated pile is tightened when the angle steel and the reinforced cushion layer are fixed; the pile top reinforcement cover is used to clamp the angle steel to prevent the cushion layer from lifting; the pile top reinforcement cover is connected to the pile top with high-strength bolts; the high-strength bolts are used to apply a preload to the reinforced cushion layer to ensure the stability of the pile head.

[0022] (3) High-strength bolts are used, which have sufficient tensile strength and shear strength. The bolts are tightened without loosening and compress the angle steel. The top of the pile is fixed to the reinforced cushion by bolt connectors and circular steel cover plates, so that the pile, reinforced cushion and soil form a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 : Top view of precast pile anti-deflection reinforced cushion

[0024] Figure 2 : Sectional view of the connection between reinforced cushion and precast pile (AA section view)

[0025] 1. Reinforced concrete cushion, 2. Precast piles, 3. Angle steel fixings, 4. Angle steel fixing bolts, 5. Pile top steel cover plate, 6. High-strength bolts. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] See also Figure 1-Figure 2 The present invention provides a technical solution: a construction method of a precast pile anti-deflection reinforced cushion layer in a soft soil area, comprising a precast pile anti-deflection reinforced cushion layer in a soft soil area, wherein the reinforced cushion layer comprises a reinforced concrete cushion layer 1 and a precast pile 2; an angle steel fixing piece 3 is provided on the reinforced concrete cushion layer 1, and an angle steel fixing bolt 4 is provided on the angle steel fixing piece 3; a pile top steel cover plate 5 is provided on the precast pile 2, and the precast pile 2 and the pile top steel cover plate 5 are connected by high-strength bolts 6;

[0028] The reinforced concrete cushion layer 1 and the precast pile 2 are connected together by angle steel fixing parts 3, pile top steel cover plate 5, angle steel fixing bolts 4 and high-strength bolts 6 to form a whole;

[0029] The specific operations are as follows:

[0030] S1: The reinforced concrete cushion layer 1 is a rectangular precast concrete cushion layer equipped with a single-layer bidirectional steel mesh. The central opening of the reinforced concrete cushion layer 1 is slightly larger than the sum of the diameter or side length of the precast pile 2 and the height of the angle steel fixing member 3. Two angle steel fixing bolts 4 are reserved on each side of the reinforced concrete cushion layer 1 at orthogonal positions. The angle steel fixing bolts 4 are pre-embedded in the reinforced concrete cushion layer 1 through embedded plates.

[0031] S2: The angle steel fixing piece 3 is welded with equal-leg angle steel into an L shape. When the angle steel fixing piece 3 is connected to the reinforced concrete cushion layer 1, the position of the angle steel fixing piece 3 is adjusted through the oblong hole on the angle steel fixing piece 3 to ensure that the four angle steel fixing pieces 3 press the precast pile 2 tightly without shaking;

[0032] S3: Four bolt holes are reserved on the top of the precast pile 2. The pile top steel cover plate 5 adopts a circular cover plate. Four holes are reserved at the positions corresponding to the pile top bolt holes of the pile top steel cover plate 5. The circular pile top steel cover plate 5 is connected and fixed to the top of the precast pile 2 by four connected high-strength bolts 6. The size of the pile top steel cover plate 5 should ensure that it can completely press the vertical angle steel section of the angle steel fixing piece 3. The high-strength bolts 6 connected on the pile top steel cover plate 5 are tightened so that the pile top steel cover plate 5 applies a preload to the angle steel fixing piece 3. The preload is transmitted to the reinforced concrete cushion layer 1 through the angle steel fixing piece 3, so that the reinforced concrete cushion layer 1 is in close contact with the soil. The soil provides support force to the reinforced concrete cushion layer 1 to prevent the precast pile 2 from tilting.

[0033] S4: After the anti-deviation reinforcement device of the precast pile 2 is in place, the gaps between the reinforced cushion layers of each precast pile are connected into a whole with a cast-in-place concrete cushion layer. After the cushion layer is connected as a whole and the strength reaches the design requirements, the high-strength bolts 6, pile top steel cover plate 5, angle steel fixing bolts 4 and angle steel fixing parts 3 connected to the top of the precast pile are successively removed and recycled. After removal, the hole in the middle of the precast reinforced cushion layer is immediately poured with cast-in-place concrete to connect the cushion layer and the pile into a whole.

[0034] The reinforced concrete cushion layer 1 is a prefabricated reinforced concrete component with a single-layer bidirectional steel mesh inside. Its shape is rectangular. The size of the rectangle is the pile spacing minus the width of the post-casting area, which is 300mm wide. A hole is reserved in the middle of the reinforced concrete cushion layer 1. The size of the reserved hole is the sum of the diameter or side length of the prefabricated pile 2 and the height of the angle steel fixing piece 3. The adjustable gap is 50mm.

[0035] The angle steel fixing member 3 is made into an L-shaped component by welding equal-leg angle steels. The flat side of the L-shaped angle steel fixing member is fixed to the reinforced concrete cushion layer 1 by bolts. The flat side of the L-shaped fixing member has an oblong hole on its angle steel leg.

[0036] The pile top steel cover plate 5 adopts a circular steel cover plate with four bolt holes reserved at orthogonal positions. The diameter of the circular pile top steel cover plate 5 is the sum of the diameter or side length of the prefabricated pile 2 and the height of the angle steel fixing piece 3.

[0037] The pile top steel cover plate 5 is connected to the top of the precast pile 2 with high-strength bolts. The pile top steel cover plate 5 is tightly connected to the angle steel fixing piece 3 through the tightening force of the high-strength bolts 6. The angle steel fixing piece 3 presses the reinforced concrete cushion layer 1 to provide reliable anti-lateral and anti-tilt support for the precast pile.

[0038] Example, see Figure 1 The reinforced concrete cushion layer 1 is a rectangular precast concrete cushion layer with a single-layer bidirectional steel mesh inside. The reserved hole in the middle of the reinforced concrete cushion layer 1 is slightly larger than the sum of the diameter or side length of the precast pile 2 and the height of the angle steel fixing piece 3. Two angle steel fixing bolts 4 are reserved on each side of the orthogonal position around the reinforced concrete cushion layer 1. The angle steel fixing bolts 4 are embedded in the reinforced concrete cushion layer 1 through the embedded plate; the angle steel fixing piece 3 is welded into an L shape by equilateral angle steel. When the angle steel fixing piece 3 is connected to the reinforced concrete cushion layer 1, the position of the angle steel fixing piece 3 is adjusted through the oblong hole on the angle steel fixing piece 3 to ensure that the four angle steel fixing pieces 3 tighten the precast pile 2 without shaking.

[0039] Reference Figure 2, four bolt holes are reserved on the top of the precast pile 2, and the pile top steel cover plate 5 adopts a circular cover plate. Four holes are reserved at the positions corresponding to the pile top bolt holes of the pile top steel cover plate 5. The circular pile top steel cover plate 5 is connected and fixed to the top of the precast pile 2 by four connected high-strength bolts 6. The size of the pile top steel cover plate 5 should ensure that it can completely press the vertical angle steel section of the angle steel fixing piece 3. Tighten the high-strength bolts 6 connected on the pile top steel cover plate 5 so that the pile top steel cover plate 5 applies a preload to the angle steel fixing piece 3. The preload is transmitted to the reinforced concrete cushion layer 1 through the angle steel fixing piece 3, so that the reinforced concrete cushion layer 1 can be reinforced. The concrete cushion layer 1 is in close contact with the soil, and the soil provides support for the reinforced concrete cushion layer 1 to prevent the precast pile 2 from tilting; after the anti-deflection reinforcement device of the precast pile 2 is in place, the gaps between the reinforced cushion layers of each precast pile are connected into a whole with a cast-in-place concrete cushion layer. After the cushion layers are connected as a whole and the strength reaches the design requirements, the high-strength bolts 6, pile top steel cover plates 5, angle steel fixing bolts 4 and angle steel fixings 3 connected to the top of the precast pile are successively removed and recycled. After removal, the hole in the middle of the precast reinforced cushion layer is immediately poured with cast-in-place concrete to connect the cushion layer and the pile into a whole.

[0040] The application uses a reinforced concrete cushion layer, which is used to add an enlarged pile cap to the top of the precast pile. When the precast pile tends to tilt, the reinforced cushion layer on the tilting side can transmit the tilting force to the soil at the bottom, thus resisting and dissipating the tilting effect through the pressure of the soil, thereby achieving the purpose of preventing the precast pile from tilting.

[0041] A single layer of bidirectional steel bars is placed within the reinforced cushion layer. Space is left in the middle of the reinforced cushion layer for the pile and angle steel, with a certain gap left for installation. The angle steel and reinforced cushion layer are connected by pre-buried bolts, and oblong holes are used at the connection points between the angle steel and the bolts to facilitate adjustment. The precast pile is tightened when the angle steel and reinforced cushion layer are fixed. The pile top reinforcement cover is used to clamp the angle steel to prevent the cushion layer from lifting. The pile top reinforcement cover is connected to the pile top with high-strength bolts. The high-strength bolts are used to apply preload to the reinforced cushion layer to ensure the stability of the pile head.

[0042] High-strength bolts are used, which have sufficient tensile and shear strength. The bolts are tightened tightly to prevent loosening and compress the angle steel. The top of the pile is fixed to the reinforced cushion through bolt connectors and circular steel cover plates, so that the pile, reinforced cushion and soil form an integral whole.

[0043] To sum up, in order to effectively prevent the pile body from tilting and damaging due to uneven soil pressure, which affects the safety and progress of the project, the column top reinforcement steel cover plate and angle steel fixings are all connected by bolts. Only the bolts need to be removed to remove the pile top steel cover plate and angle steel fixings. The subsequent dismantling is convenient and quick. The angle steel connectors, pile top cover plate and bolts can be reused to reduce costs.

[0044] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0045] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A construction method for a precast pile anti-deflection reinforced cushion in soft soil areas, characterized by: The invention comprises a reinforced cushion layer for preventing precast piles from deflecting in soft soil areas, wherein the reinforced cushion layer comprises a reinforced concrete cushion layer (1) and a precast pile (2); an angle steel fixing piece (3) is provided on the reinforced concrete cushion layer (1), and an angle steel fixing bolt (4) is provided on the angle steel fixing piece (3); a pile top steel cover plate (5) is provided on the precast pile (2), and the precast pile (2) and the pile top steel cover plate (5) are connected by high-strength bolts (6); The reinforced concrete cushion layer (1) and the prefabricated pile (2) are connected together through angle steel fixing pieces (3), pile top steel cover plates (5), angle steel fixing bolts (4) and high-strength bolts (6) to form a whole; The specific operations are as follows: S1: The reinforced concrete cushion layer (1) is a rectangular precast concrete cushion layer equipped with a single-layer bidirectional steel mesh. The central opening of the reinforced concrete cushion layer (1) is slightly larger than the sum of the diameter or side length of the precast pile (2) and the height of the angle steel fixing member (3). Two angle steel fixing bolts (4) are reserved on each side of the orthogonal positions around the reinforced concrete cushion layer (1). The angle steel fixing bolts (4) are embedded in the reinforced concrete cushion layer (1) through the embedded plate. S2: The angle steel fixing piece (3) is welded into an L shape by using equal-leg angle steel. When the angle steel fixing piece (3) is connected to the reinforced concrete cushion layer (1), the position of the angle steel fixing piece (3) is adjusted through the oblong hole on the angle steel fixing piece (3) to ensure that the four angle steel fixing pieces (3) press the prefabricated pile (2) tightly without shaking; S3: Four bolt holes are reserved on the top of the precast pile (2). The pile top steel cover plate (5) adopts a circular cover plate. Four holes are reserved on the pile top steel cover plate (5) at positions corresponding to the pile top bolt holes. The circular pile top steel cover plate (5) is connected and fixed to the top of the precast pile (2) by four connected high-strength bolts (6). The size of the pile top steel cover plate (5) should ensure that it completely presses the vertical angle steel section of the angle steel fixing piece (3). The high-strength bolts (6) connected on the pile top steel cover plate (5) are tightened so that the pile top steel cover plate (5) applies a preload to the angle steel fixing piece (3). The preload is transmitted to the reinforced concrete cushion layer (1) through the angle steel fixing piece (3), so that the reinforced concrete cushion layer (1) is in close contact with the soil. The soil provides support force to the reinforced concrete cushion layer (1) to prevent the precast pile (2) from tilting. S4: After the precast pile (2) anti-deviation reinforcement device is in place, the gaps between the reinforced cushion layers of each precast pile are connected into a whole with a cast-in-place concrete cushion layer. After the cushion layer is connected into a whole and the strength reaches the design requirements, the high-strength bolts (6) connected to the top of the precast pile, the pile top steel cover plate (5), the angle steel fixing bolts (4) and the angle steel fixing parts (3) are successively removed and recycled. After removal, the hole in the middle of the precast reinforced cushion layer is immediately poured with cast-in-place concrete to connect the cushion layer and the pile into a whole.

2. The construction method of a precast pile anti-deflection reinforced cushion layer in soft soil area according to claim 1, characterized in that: The reinforced concrete cushion layer (1) is a reinforced concrete prefabricated component with a single-layer bidirectional steel mesh inside. Its shape is rectangular. The size of the rectangle is the width of the post-casting area minus the width of the post-casting area, which is 300 mm. A hole is reserved in the middle of the reinforced concrete cushion layer (1). The size of the reserved hole is the sum of the diameter or side length of the prefabricated pile (2) and the height of the angle steel fixing piece (3). The adjustable gap is 50 mm.

3. The construction method of a precast pile anti-deflection reinforced cushion layer in soft soil area according to claim 1, characterized in that: The angle steel fixing member (3) is made into an L-shaped member by welding equal-leg angle steels. The flat side of the L-shaped angle steel fixing member is fixed to the reinforced concrete cushion layer (1) by bolt connection. The flat side of the L-shaped angle steel fixing member has an oblong hole on its angle steel limb.

4. The construction method of a precast pile anti-deflection reinforced cushion layer in soft soil area according to claim 1, characterized in that: The pile top steel cover plate (5) is a circular steel cover plate with four bolt holes reserved at orthogonal positions. The diameter of the circular pile top steel cover plate (5) is the sum of the diameter or side length of the prefabricated pile (2) and the height of the angle steel fixing piece (3).

5. The construction method of a precast pile anti-deflection reinforced cushion layer in soft soil area according to claim 1, characterized in that: The pile top steel cover plate (5) is connected to the top of the precast pile (2) by high-strength bolts. The pile top steel cover plate (5) is pressed and connected to the angle steel fixing piece (3) by the tightening force of the high-strength bolts (6). The angle steel fixing piece (3) presses the reinforced concrete cushion layer (1) to provide reliable anti-lateral and anti-tilt support for the precast pile.

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