Method for manufacturing and construction of a solid pier

Abstract

A kind of preparation construction method of solid pier, the technical field of bridge construction, pier construction method includes: bearing platform roughening, reinforcement construction, inner core pouring construction, outer layer pouring construction etc.The construction method of solid pier of the present application, design in the joint pouring of inner core and outer layer, improve the connectivity of interval, with good shear resistance, seismic resistance;Design concrete specification and pouring process parameters can improve the comprehensive seismic resistance of inner core and outer layer, can guarantee 50m height of solid pier seismic resistance, prolong service life;In addition, bearing platform roughening and inner core column roughening are designed, improve the connection strength of concrete, ensure quality, have better seismic resistance.

Description

Technical Field

[0001] This invention belongs to the field of bridge construction technology, specifically relating to a method for preparing and constructing solid piers. Background Technology

[0002] Bridge piers are the intermediate load-bearing structures that support multi-span bridges. There are three structural forms of bridge piers: column piers, thin-walled hollow piers, and thin-walled solid piers. Piers under 35m in height are mainly column piers, while those over 35m mainly use solid thin-walled piers and hollow thin-walled piers. The quality of bridge piers directly affects the safety performance of the bridge structure. Solid piers are one type of bridge pier, requiring on-site casting, typically using formwork. On-site casting is susceptible to the influence of the construction and curing environments, making quality difficult to guarantee. Especially for tall bridge piers with large spans, solid piers are required based on load-bearing requirements, connected by pier caps. However, large solid piers cannot be manufactured as a single unit and must be constructed segmentally. The connection quality between segments is highly susceptible to changes in environmental conditions, easily leading to poor quality, instability, and poor seismic performance. Summary of the Invention

[0003] To address the problems of inconsistent quality and poor seismic performance in existing solid pier construction methods, this invention provides a method for preparing and constructing solid piers. The method involves staggered casting of the inner core and outer layer to improve the connection between sections, resulting in good shear resistance and seismic performance. The designed concrete specifications and casting process parameters enhance the overall seismic resistance of the inner core and outer layer, ensuring seismic performance for solid piers up to 50m in height and extending their service life. Furthermore, the design includes roughening the pier cap and inner core columns to improve concrete connection strength and ensure quality. The specific technical solution is as follows:

[0004] A method for preparing and constructing a solid pier includes the following steps:

[0005] S1, roughening of the foundation:

[0006] Before the construction of the pier body, the top surface of the pier cap within the pier body area shall be roughened to a depth of not less than 1cm to ensure the concrete connection strength; after roughening, the debris shall be swept away and rinsed with clean water.

[0007] S2, Reinforcement Construction:

[0008] S3, First section: Installation of inner core formwork and concrete pouring:

[0009] Install the inner core formwork, with a formwork height of 6-7m and an inner diameter of 2 / 5 to 1 / 2 of the solid pier diameter. After the inner core formwork is installed, pour concrete in layers, each layer not exceeding 30cm in thickness, vibrate, shape, demold, and cure to form the inner core column.

[0010] S4, First section: Installation of outer formwork and concrete pouring:

[0011] The inner core concrete column is roughened to a depth of not less than 1cm to ensure the strength of the concrete connection; after roughening, the debris is cleaned up.

[0012] Install the outer formwork, with a height of 4.5 to 5.5 meters. The inner diameter of the formwork frame is the same as the diameter of the solid pier. After the outer formwork is installed, pour concrete in layers, each layer not exceeding 30 cm in thickness. Vibrate, shape, demold, and cure to form the pier column.

[0013] S5, heightening construction:

[0014] Repeat step S3 to install the second section of the inner core formwork, pour concrete, shape, demold, and cure.

[0015] Repeat step S4 to install the second outer formwork, pour concrete, shape, demold, and cure.

[0016] Following this example, the height could be increased to over 30m.

[0017] S2 of the above technical solution, the reinforcement construction includes:

[0018] S2.1 Rebar Cutting:

[0019] The reinforcing bars should be straightened before cutting. The cut end should be perpendicular to the axis of the reinforcing bar. An abrasive wheel cutter should be used for cutting. The distance between the cut end of the reinforcing bar and the bending point should be no less than 10 times the diameter of the reinforcing bar.

[0020] S2.2 Thread processing:

[0021] For machining threaded ends, the thread length should not be less than 1 / 2 of the connecting sleeve length, and the allowable error is +2P, where P is the pitch; use water-based lubricant when machining threaded ends.

[0022] S2.3 Reinforcing bar connection installation:

[0023] When connecting reinforcing bars, align them with the axis, screw the threaded end of the reinforcing bar into the connecting sleeve, and then tighten it with a torque wrench to complete the connection and installation of the reinforcing bars.

[0024] In S2.2 of the above technical solution, after the thread end of the reinforcing bar is processed, a thread end protective cap should be put on or a connecting sleeve should be screwed on immediately to prevent damage to the thread end when loading and unloading the reinforcing bar.

[0025] In S2.3 of the above technical solution, the diameter of the reinforcing bar is 28-32mm, and the tightening torque of the thread is 360N·m.

[0026] In S2.3 of the above technical solution, when connecting horizontal reinforcing bars, the connection is carried out sequentially from one end to the other. During the connection, two people stand facing each other. One person uses a wrench and pipe wrench to hold the already connected reinforcing bars, while the other person uses a torque wrench to tighten the reinforcing bars to be connected, so as to avoid damaging the already connected reinforcing bar joints.

[0027] In S3 of the above technical solution, the concrete is C50 concrete; during pouring, the concrete pouring speed is controlled within 3m / h to reduce hydration heat and lateral force on the concrete; a diameter of... Use an immersion vibrator to compact the concrete at an angle along the pouring direction, with the horizontal angle of the vibrator bar at 55-60° and the bar head pointing in the forward direction. The spacing between the bars should be 40-50cm. Avoid vibrating the reinforcing bars. Vibration should continue until the concrete surface starts to bubble and swell. The slump of the concrete should be maintained between 80-120mm after placement in the formwork. Deform the concrete when its strength reaches 20MPa. Apply a release agent to the formwork surface. The amount of release agent should be glossy but without oil stains, ensuring that the release agent is applied evenly and without dripping. Curing should last for no less than 14 days.

[0028] In S4 of the above technical solution, the concrete is C35 concrete; during pouring, the concrete pouring speed is controlled within the range of 3-5 m / h; and a diameter of... Use an immersion vibrator to compact the concrete at an angle along the pouring direction, with the horizontal angle of the vibrator bar at 55-60° and the bar head pointing in the forward direction. The spacing between the bars should be 40-50cm. Avoid vibrating the reinforcing bars. Vibration should continue until the concrete surface starts to bubble and swell. The slump of the concrete should be maintained between 100-140mm after placement in the formwork. Deform the concrete when its strength reaches 15MPa. Apply a release agent to the formwork surface. The amount of release agent should be glossy but without oil stains, ensuring that the release agent is evenly distributed and does not drip. Curing should last for no less than 14 days.

[0029] In the above technical solution, the template pieces of the inner core template and the outer template include plywood 1, vertical ribs 2 (I-beams) and horizontal ribs 3 (double channel steel back ribs). The vertical ribs 2 are evenly distributed and connected to the horizontal ribs 3 on one side by connecting claws. The other side of the vertical ribs 2 is connected to the plywood 1 by self-tapping screws and floor nails. The template pieces are equipped with hooks 4 for lifting and installation.

[0030] In the above technical solution, the inner core template is installed to avoid the longitudinal and transverse reinforcing bars, and the gaps at the longitudinal and transverse reinforcing bars are sealed with sealing material.

[0031] In the above technical solution, a distance is left between the outer formwork and the reinforcing steel surface.

[0032] In the above technical solution, the casting surface of each section of the inner core column is staggered from the casting surface of each section of the pier column.

[0033] The present invention provides a method for preparing and constructing a solid pier, which, compared with the prior art, has the following advantages:

[0034] I. The method of this invention is designed to perform a comprehensive roughening treatment on the top surface of the pier body, with a roughening depth of not less than 1cm, which can ensure the connection strength of the pier concrete.

[0035] Second, the method of this invention uses an abrasive wheel cutter for cutting steel bars, which can ensure the straightness of the cut end face and the quality of the butt joint connection; the distance between the cut end of the steel bar and the bending point of the steel bar is designed to be no less than 10 times the diameter of the steel bar, which can effectively protect the strength of the connection.

[0036] Third, after the threaded ends of the reinforcing bars are processed by the method of this invention, a threaded end protective cap or a connecting sleeve is immediately put on to prevent damage to the threaded ends during loading and unloading of the reinforcing bars and to ensure the quality of the reinforcing bars; the reinforcing bar diameter is designed to be 28-32mm and the threaded end tightening torque is 360N·m, which can ensure the connection quality of the reinforcing bars.

[0037] IV. When designing the method for connecting horizontal reinforcing bars in this invention, the connection is carried out sequentially from one end to the other. During the connection, two people stand facing each other. One person uses a wrench and pipe wrench to hold the already connected reinforcing bars, while the other person uses a torque wrench to tighten the reinforcing bars to be connected, so as to avoid damaging the already connected reinforcing bar joints and ensure quality.

[0038] V. The pier design of the present invention is divided into inner core casting and outer layer casting. The height of the inner core casting section and the height of the outer layer casting section are staggered. C50 concrete is used for the inner core casting and C35 concrete is used for the outer layer casting. The combination of inner core structure and outer layer structure with different strengths can have good seismic resistance and stress damping.

[0039] VI. The method of this invention designs the inner core template with a height of 6-7m, and the inner diameter of the template frame is 2 / 5 to 1 / 2 of the diameter of the solid pier; the outer template has a height of 4.5-5.5m, and the inner diameter of the template frame is the same as the diameter of the solid pier. This allows for effective staggered design, which improves the connection strength between sections of the pier column. Existing technology involves casting each section as a single unit, resulting in low connection strength between sections and a tendency for segmental fracture during earthquakes.

[0040] VII. In the design of the inner core casting method of this invention, the concrete pouring speed is controlled within 3m / h, which can effectively reduce the heat of hydration and the lateral force of the concrete; using a diameter An immersion vibrator is used for compaction, vibrating obliquely along the direction of concrete pouring. The horizontal inclination angle of the vibrator is 55-60°, with the head of the vibrator facing the forward direction, and the spacing between the vibrators is 40-50cm. The vibration time is until the concrete surface bubbles and slurries, which can ensure the quality of concrete pouring. The slump of the concrete is maintained between 80-120mm after being placed in the formwork. The formwork is removed when the concrete strength reaches 20MPa to ensure the molding strength.

[0041] 8. The method of this invention is designed to perform a full roughening treatment on the inner core concrete column, with a roughening depth of not less than 1cm, which can effectively improve the connection strength between the inner core and the outer concrete layer.

[0042] 9. The template pieces of the inner core template and outer layer template designed by the method of the present invention include plywood, vertical ribs and horizontal ribs. The size of the template can be adjusted at will and spliced ​​at will, which is suitable for the assembly of inner core template and outer layer template. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the template in the construction method for preparing a solid pier according to the present invention. In the figure: 1-plywood, 2-vertical rib, 3-horizontal rib, 4-hook.

[0044] Figure 2 This is a schematic diagram of the steel reinforcement connected by a connecting sleeve in the construction method for preparing a solid pier according to the present invention.

[0045] Figure 3 This is a cross-sectional schematic diagram showing the pouring height of the inner core concrete and the pouring height of the outer layer concrete in each section of a solid pier according to the present invention. Detailed Implementation

[0046] The following are specific implementation cases and appendices. Figure 1-3 The present invention will be further described, but the present invention is not limited to these embodiments.

[0047] Example

[0048] Taking eight piers along a certain road section as an example, the highest is 50m and the lowest is 36.4m. The pier cross-section dimensions are 7.65*2.4m, as shown in Table 1 below:

[0049] Table 1. Statistics on the Number of Solid Piers

[0050]

[0051] Topography, landforms, and geology: The bridge site is located in a piedmont hilly area. The bridge spans a mountain valley with deep erosion. To the northeast is a low hilly area with glacial till deposits on the ridge and colluvial deposits at the leading edge of the ridge. The elevation ranges from 1696 to 1782 meters. Between the ridge and the riverbed are relatively steep steps, composed of dense, compacted pebble deposits. Large trees are found in the riverbed section, which has a continuous flow of moderate water at an elevation of approximately 1696 meters. The riverbed itself contains pebble and boulder deposits. The southwest bank of the riverbed is flat and consists of farmland, with an elevation range of 1734 to 1748 meters. The terraces are composed of pebble and gravel deposits, weakly cemented, and moderately dense.

[0052] Hydrological conditions: There is no surface water in the proposed bridge site area, and no groundwater was found within the exploration depth range.

[0053] Earthquake conditions: The peak ground acceleration of the section is 0.20g, the basic seismic intensity is VIII, and the characteristic period of the response spectrum is 0.40-0.45s.

[0054] Tower crane setup: During construction, vertical transportation is carried out using a combination of cranes and tower cranes. Cranes are used for vertical transportation within 30m, while tower cranes are used for vertical transportation of piers larger than 30m. Tower cranes are used to install and dismantle formwork and transport steel bars during construction to ensure the construction of piers and upper beams.

[0055] Tower crane selection and layout principles: The tower crane should cover the entire construction area to reduce blind spots; the maximum lifting capacity of the tower crane should meet the construction requirements.

[0056] Tower crane selection, layout and use: Install 5 ZM6013 tower cranes.

[0057] In addition to the normal construction setting-out procedures, the following controls are required for surveying and setting out during the construction of high piers:

[0058] (1) The total station coordinate layout method was adopted for the plane construction layout. The layout line distance was controlled within 200 meters during the layout, and control points with elevations close to the upper and lower sections of the pier were selected for control to eliminate errors caused by excessive pitch angle of the measuring instrument. Two-point verification was also used to reduce errors, thereby improving control accuracy.

[0059] (2) The elevation of the bridge piers is controlled by using a level instrument in conjunction with a ruler.

[0060] (3) The verticality of the pier is controlled using a total station. The measuring point is selected at a distance of 20-30 meters from the pier, and the measurement is carried out along the route direction and perpendicular to the route direction to ensure the overall verticality of the pier.

[0061] Pier construction will proceed after foundation construction.

[0062] A method for preparing and constructing a solid pier includes the following steps:

[0063] S1, roughening of the foundation:

[0064] Before the construction of the pier body, the top surface of the pier cap within the pier body area shall be roughened to a depth of not less than 1cm to ensure the concrete connection strength; after roughening, the debris shall be swept away and rinsed with clean water.

[0065] S2, Reinforcement Construction:

[0066] S2.1 Rebar Cutting:

[0067] The reinforcing bars are threaded bars. The reinforcing bars are straightened before cutting. The cut end face is perpendicular to the axis of the reinforcing bar. An abrasive wheel cutting machine is used for cutting. The distance from the cut end of the reinforcing bar to the bending point is not less than 10 times the diameter of the reinforcing bar.

[0068] S2.2 Thread processing:

[0069] When machining threaded ends, the thread length should not be less than 1 / 2 of the connecting sleeve length, and the allowable error is +2P, where P is the pitch. Use water-based lubricant when machining threaded ends. After machining the threaded ends of the reinforcing bars, immediately put on the threaded end protective cap or screw on the connecting sleeve to prevent damage to the threaded ends when loading and unloading the reinforcing bars.

[0070] S2.3 Reinforcing bar connection installation:

[0071] When connecting reinforcing bars, align them with the axis, screw the threaded ends of the reinforcing bars into the connecting sleeve, and then tighten them with a torque wrench. Figure 2 As shown, the diameter of the reinforcing bar is 28-32mm, and the tightening torque of the thread is 360N·m, thus completing the connection and installation of the reinforcing bar.

[0072] When connecting horizontal reinforcing bars, proceed sequentially from one end to the other. Two people should stand facing each other during the connection process. One person should use a wrench and pipe wrench to hold the already connected reinforcing bars in place, while the other person should use a torque wrench to tighten the reinforcing bars to be connected, in order to avoid damaging the already connected reinforcing bar joints.

[0073] S3, First section: Installation of inner core formwork and concrete pouring:

[0074] Install the inner core formwork, with a formwork height of 6-7m. The inner diameter of the formwork frame is 2 / 5 to 1 / 2 of the diameter of the solid pier. The inner core formwork should avoid the longitudinal and transverse reinforcing bars. The gaps at the longitudinal and transverse reinforcing bars should be sealed with sealing material. After the inner core formwork is installed, pour concrete in layers, each layer not exceeding 30cm in thickness. Vibrate, shape, demold, and cure to form the inner core column.

[0075] The concrete is C50; during pouring, the concrete pouring speed is controlled within 3m / h to reduce hydration heat and lateral force on the concrete; a diameter of... Use an immersion vibrator to compact the concrete at an angle along the pouring direction, with the horizontal angle of the vibrator bar at 55-60° and the bar head pointing in the forward direction. The spacing between the bars should be 40-50cm. Avoid vibrating the reinforcing bars. Vibration should continue until the concrete surface starts to bubble and swell. The slump of the concrete should be maintained between 80-120mm after placement in the formwork. Deform the concrete when its strength reaches 20MPa. Apply a release agent to the formwork surface. The amount of release agent should be glossy but without oil stains, ensuring that the release agent is applied evenly and without dripping. Curing should last for no less than 14 days.

[0076] S4, First section: Installation of outer formwork and concrete pouring:

[0077] The inner core concrete column is roughened to a depth of not less than 1cm to ensure the strength of the concrete connection; after roughening, the debris is cleaned up.

[0078] Install the outer formwork, with a height of 4.5 to 5.5 meters. The inner diameter of the formwork frame is the same as the diameter of the solid pier. Leave a distance between the outer formwork and the reinforcing steel surface. After the outer formwork is installed, pour concrete in layers, each layer not exceeding 30 cm in thickness. Vibrate, shape, demold, and cure to form the pier column.

[0079] The concrete is C35 concrete; the pouring speed is controlled within the range of 3-5 m / h; a diameter of... Use an immersion vibrator to compact the concrete at an angle along the pouring direction, with the horizontal angle of the vibrator bar at 55-60° and the bar head pointing in the forward direction. The spacing between the bars should be 40-50cm. Avoid vibrating the reinforcing bars. Vibration should continue until the concrete surface starts to bubble and swell. The slump of the concrete should be maintained between 100-140mm after placement in the formwork. Deform the concrete when its strength reaches 15MPa. Apply a release agent to the formwork surface. The amount of release agent should be glossy but without oil stains, ensuring that the release agent is evenly distributed and does not drip. Curing should last for no less than 14 days.

[0080] S5, heightening construction:

[0081] Repeat step S3 to install the second section of the inner core formwork, pour concrete, shape, demold, and cure.

[0082] Repeat step S4 to install the second outer formwork, pour concrete, shape, demold, and cure.

[0083] The pouring surfaces of each section of the inner core column are staggered from those of each section of the pier column, meaning the cross-sections of the pouring height of the inner core concrete and the pouring height of the outer layer concrete in each section are as follows: Figure 3 As shown; by extension, the height can be increased to over 30m.

[0084] In this embodiment, the template pieces of the inner core template and the outer template include plywood 1, vertical ribs 2 (I-beams), and horizontal ribs 3 (double-channel steel back braces). One side of the evenly distributed vertical ribs 2 is connected to the horizontal ribs 3 using connecting claws, and the other side of the vertical ribs 2 is connected to the plywood 1 using self-tapping screws and floor nails. Each template piece is equipped with a hook 4 for lifting and installation. Figure 1 As shown.

[0085] The acceptance standards for steel reinforcement installation are shown in Table 2 below:

[0086] Table 2 Measured Items for Reinforcing Steel Processing and Installation

[0087]

Claims

1. A method for preparing and constructing a solid pier, characterized in that, Includes the following steps: S1, roughening of the foundation: Before the construction of the pier body, the top surface of the pier cap within the pier body area shall be roughened to a depth of not less than 1cm to ensure the concrete connection strength; after roughening, the debris shall be swept away and rinsed with clean water. S2, Reinforcement Construction: S3, First section: Installation of inner core formwork and concrete pouring: Install the inner core formwork, with a formwork height of 6-7m and an inner diameter of 2 / 5 to 1 / 2 of the solid pier diameter. After the inner core formwork is installed, pour concrete in layers, each layer not exceeding 30cm in thickness, vibrate, shape, demold, and cure to form the inner core column. S4, First section: Installation of outer formwork and concrete pouring: The inner core concrete column is roughened to a depth of not less than 1cm to ensure the strength of the concrete connection; after roughening, the debris is cleaned up. Install the outer formwork, with a height of 4.5~5.5m. The inner diameter of the formwork frame is the same as the diameter of the solid pier. After the outer formwork is installed, pour concrete in layers, each layer not exceeding 30cm in thickness. Vibrate, shape, demold, and cure to form the pier column. S5, heightening construction: Repeat step S3 to install the second section of the inner core formwork, pour concrete, shape, demold, and cure. Repeat step S4 to install the second outer formwork, pour concrete, shape, demold, and cure. Following this example, the height could be increased to over 30m.

2. The method for preparing and constructing a solid pier according to claim 1, characterized in that, S2, Reinforcement construction includes: S2.1 Rebar Cutting: The reinforcing bars should be straightened before cutting. The cut end should be perpendicular to the axis of the reinforcing bar. An abrasive wheel cutter should be used for cutting. The distance between the cut end of the reinforcing bar and the bending point should be no less than 10 times the diameter of the reinforcing bar. S2.2 Thread processing: For machining threaded ends, the thread length should not be less than 1 / 2 of the connecting sleeve length, and the allowable error is +2P, where P is the pitch; use water-based lubricant when machining threaded ends. S2.3 Reinforcing bar connection installation: When connecting reinforcing bars, align them with the axis, screw the threaded end of the reinforcing bar into the connecting sleeve, and then tighten it with a torque wrench to complete the connection and installation of the reinforcing bars.

3. The method for preparing and constructing a solid pier according to claim 2, characterized in that, In S2.2, after the threads of the reinforcing bars are processed, immediately put on the thread protection cap or screw on the connecting sleeve to prevent damage to the threads when loading and unloading the reinforcing bars.

4. The method for preparing and constructing a solid pier according to claim 2, characterized in that, In S2.3, the diameter of the reinforcing bar is 28-32mm, and the tightening torque of the thread is 360N·m.

5. The method for preparing and constructing a solid pier according to claim 2, characterized in that, In S2.3, when connecting horizontal reinforcing bars, the connection should be carried out sequentially from one end to the other. During the connection, two people should stand facing each other. One person should use a wrench and pipe wrench to hold the already connected reinforcing bars in place, while the other person should use a torque wrench to tighten the reinforcing bars to be connected, so as to avoid damaging the already connected reinforcing bar joints.

6. The method for preparing and constructing a solid pier according to claim 1, characterized in that, In S3, the concrete is C50 concrete. During pouring, the concrete pouring speed is controlled within 3m / h to reduce hydration heat and lateral force. A φ50mm immersion vibrator is used for compaction, vibrating obliquely along the concrete pouring direction, with a horizontal inclination angle of 55~60°, the vibrator head facing the forward direction, and a spacing of 40~50cm between vibrators. Vibration should avoid the reinforcing steel, and the vibration time should continue until the concrete surface shows signs of bubbling. The slump of the concrete should be maintained between 80~120mm after placement in the formwork. The formwork should be removed when the concrete strength reaches 20MPa. Apply release agent to the template surface. The amount of release agent should be enough to create a glossy finish without leaving oil marks. Ensure that the release agent is applied evenly and without dripping. Cure for no less than 14 days.

7. The method for preparing and constructing a solid pier according to claim 1, characterized in that, In S4, the concrete is C35 concrete; during pouring, the concrete pouring speed is controlled within the range of 3~5m / h; a φ50mm diameter immersion vibrator is used for vibration, vibrating obliquely along the concrete pouring direction, with the horizontal inclination angle of the vibrator bar being 55~60°, the bar head facing the forward direction, and the bar spacing being 40~50cm; vibration should avoid the reinforcing steel, and the vibration time should continue until the concrete surface shows signs of bubbling and seeping out; the slump of the concrete should be maintained between 100~140mm after being placed in the formwork; the formwork should be removed when the concrete strength reaches 15MPa. Apply release agent to the template surface. The amount of release agent should be enough to create a glossy finish without leaving oil marks. Ensure that the release agent is applied evenly and without dripping. Cure for no less than 14 days.

8. The method for preparing and constructing a solid pier according to claim 1, characterized in that, The template pieces of the inner core template and the outer template include plywood (1), vertical ribs (2) and horizontal ribs (3). The vertical ribs (2) are evenly distributed and connected to the horizontal ribs (3) on one side by connecting claws. The vertical ribs (2) are connected to the plywood (1) on the other side by self-tapping screws and floor nails. The template pieces are equipped with hooks (4) for lifting and installation.

9. The method for preparing and constructing a solid pier according to claim 1, characterized in that, The inner core formwork is installed away from the longitudinal and transverse reinforcing bars, and the gaps at the longitudinal and transverse reinforcing bars are sealed with sealing material; the outer formwork is installed with a distance between it and the reinforcing bar surface.

10. The method for preparing and constructing a solid pier according to claim 1, characterized in that, The casting surfaces of each section of the inner core column are staggered from those of each section of the pier column.

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