Bridge pier column construction structure capable of conveniently controlling thickness of steel bar protective layer and construction method

Abstract

The invention discloses a bridge pier column construction structure capable of conveniently controlling the thickness of a steel bar protection layer and a construction method. The construction structure comprises a steel bar cage, a steel formwork and a protection layer control assembly. An operation opening is formed in the position, where the protection layer control assembly is arranged, of the steel formwork, and the operation opening is covered with an operation cover plate capable of being freely opened and closed. The protection layer control assembly comprises a fixing nut welded to a main reinforcement of the reinforcement cage, an adjusting screw in threaded connection with the fixing nut, a hemispherical protruding part coaxially arranged at the other end of the adjusting screw relative to the fixing nut, a cross opening coaxially arranged on the protruding side of the hemispherical protruding part with the adjusting screw, and a concrete cushion block. The problems that when the thickness of a steel bar protection layer is controlled through a traditional method, a concrete cushion block is fixed unstably, a stainless steel component is subjected to primary battery reaction to corrode bridge pier column steel bars, the installation position and the installation angle are difficult to control when fixing nuts are welded, and the thickness of a steel bar control layer cannot be adjusted after mold closing are solved.

Description

Technical Field

[0001] The present invention belongs to the technical field of bridge construction, and particularly relates to a bridge pier construction structure and construction method for facilitating the control of the thickness of the steel bar protection layer. Background Technique

[0002] Bridge pier construction is generally involved in highway engineering, municipal road engineering, and railway engineering. With the maturity of bridge construction technology, the requirements for various quality control indicators are also getting higher and higher. Among them, the control of the steel bar protection layer is an important control parameter in bridge structure construction. The steel bar protection layer directly affects the durability and even the structural safety of the bridge structure. If the steel bar protection layer is too large, cracks are likely to occur on the concrete surface, affecting the structural safety. If the steel bar protection layer is too small, the steel bars cannot be effectively protected, and steel bar corrosion and volume expansion are likely to occur, and then the concrete is broken. After the concrete is damaged, it will accelerate the steel bar corrosion, resulting in a vicious cycle of steel bar corrosion - concrete damage - accelerated steel bar corrosion.

[0003] At present, in bridge pier construction, the thickness of the steel bar protection layer is mainly controlled by using concrete blocks. The method is to directly bind the concrete blocks evenly in a plum blossom shape to the main steel bars by using binding wires, and control that there are no less than 4 concrete blocks per square meter. The binding wire heads are bent inward. This method is simple to operate and has a relatively high working efficiency, but there are also certain problems: 1. The concrete blocks are fixed by binding wires, and the connection strength is relatively low. During the construction process, they are easily squeezed and knocked by the formwork, causing the concrete blocks to move or fall, resulting in inaccurate control of the thickness of the steel bar protection layer.

[0004] 2. The blocks are usually prefabricated in the factory in advance, and their sizes are fixed, so the applicability to the control of different steel bar protection layer thicknesses is relatively poor.

[0005] 3. During construction, the concrete blocks are first fixed by binding wires and then the steel formwork is installed. In this way, it is relatively difficult to adjust the thickness of the steel bar protection layer once the formwork is closed.

[0006] With the increasing requirements for bridge construction quality, people have gradually paid more attention to the research on the control of the thickness of the steel bar protection layer of bridge piers. For example, the Chinese Utility Model Patent (Application No. 201620445974.5) discloses a device for controlling the thickness of the steel bar protection layer of a bridge pier, which proposes a structure of a screw rod and a nut. There is a closed head at the upper end of the nut, and the inner wall of the closed head is provided with a thread matching the screw rod. The stainless steel screw rod is welded to the steel bar, and by rotating the nut, fine adjustment is carried out until the distance from the end of the closed head to the steel bar skeleton is the thickness of the steel bar protection layer. The construction progress and construction quality can be increased several times.

[0007] After retrieval, some steel bar protection layer control devices similar to the above are also disclosed in the prior art to achieve precise control of the steel bar protection layer thickness. However, most of them are made of stainless steel components, and the following problems still exist during use: 1. Generally, the stainless steel protection layer control device needs to be welded to the main steel bar to ensure the connection strength, and then plays a role in controlling the steel bar protection layer thickness by supporting the formwork. However, the volume of the stainless steel protection layer control device is small, and the welding quality is not easy to guarantee. For example, in the Chinese utility model patent (application number 201620445974.5), it is usually difficult to position and weld the nut flat on the steel bar during construction.

[0008] 2. After the construction of the pier column is completed, the thickness of the concrete protection layer will be greatly reduced at the top of the stainless steel nut, and even in some parts, it will be in direct contact with the air. Although stainless steel itself is not easy to rust, it is welded to the steel reinforcement cage. When it rains, the stainless steel nut is in direct contact with the rainwater, and a water seepage channel is formed at the contact interface between it and the concrete, creating an electrolyte environment near the steel reinforcement cage, generating a galvanic cell reaction, which will accelerate the rusting speed of the steel reinforcement cage at the connection with the protection layer control device, thus causing the steel bars to rust and affecting the force-bearing capacity and durability of the pier column.

[0009] 3. The stainless steel protection layer control device is in direct contact with the steel formwork. When adjusting the steel formwork, the stainless steel protection layer control device will resist the formwork. Due to the high strength of the stainless steel protection layer control device and the small contact area between the stainless steel nut and the formwork, it is easy to leave pits on the formwork surface. After the formwork is used repeatedly, the surface flatness of the pier column construction will be poor, and at the same time, the formwork will be damaged.

[0010] 4. The stainless steel protection layer control device usually needs to be installed and fixed after the steel bars are installed and before the formwork is closed. If the thickness of the steel bar protection layer does not meet the requirements, it is necessary to turn over the formwork and enter the inside of the steel reinforcement cage for adjustment. For pier columns with small structural dimensions, the working space is small and it is difficult to adjust. Summary of the Invention

[0011] Aiming at the above problems, the purpose of the present invention is to provide a bridge pier column construction structure and construction method that are convenient for controlling the thickness of the steel bar protection layer.

[0012] The present invention is realized through the following technical solutions.

[0013] In a first aspect, the present invention provides a bridge pier construction structure facilitating the control of the steel bar protection layer thickness, including a steel bar cage and a steel formwork that is arranged around the periphery of the steel bar cage to form a construction space for pouring the bridge pier. It is characterized in that it further includes: a protection layer control component arranged between the steel formwork and the steel bar cage; an operation opening is provided on the steel formwork at the position where the protection layer control component is arranged, and an operation cover plate that can freely open and close is covered on the operation opening; the protection layer control component includes a fixing nut welded to the main steel bars of the steel bar cage, an adjusting screw threadedly connected to the fixing nut, a hemispherical protrusion portion coaxially arranged relative to the fixing nut at the other end of the adjusting screw, a cross opening coaxially arranged with the adjusting screw on the protruding side of the hemispherical protrusion portion, and a concrete cushion block; the concrete cushion block is successively provided with a hemispherical recessed portion and an operation hole that communicate with each other in the middle position along its thickness direction, and the operation hole is filled with cement mortar; the hemispherical recessed portion on one side of the concrete cushion block is fitted and abutted with the hemispherical protrusion portion, and the upper and lower ends of the other side of the concrete cushion block are respectively abutted with the upper and lower ends of the operation opening, so that the protection layer control component is supported between the steel bar cage and the steel formwork to control the steel bar protection layer thickness during the construction of the bridge pier.

[0014] Preferably, the protection layer control component further includes a connecting bar coaxially arranged with the adjusting screw on the protruding side of the hemispherical protrusion portion, the connecting bar extends into the operation hole, and the cross opening is arranged at the outer end of the connecting bar.

[0015] Preferably, the operation hole is a tapered hole, its larger hole opening is connected to the operation opening, and its smaller hole opening is communicated with the hemispherical recessed portion.

[0016] Preferably, one side of the operation cover plate is hinged to one side of the operation opening, and the other side of the operation cover plate is connected to the other side of the operation opening through a fastener.

[0017] Preferably, the interface edges of the operation opening and the operation cover plate are inclined and fitted to each other, so that when the operation cover plate covers the operation opening, the two are fitted and sealed, thereby preventing slurry leakage at the operation opening during the pouring of concrete.

[0018] Preferably, the protection layer control components are uniformly arranged in the annular space between the steel formwork and the steel bar cage, and 3 - 4 protection layer control components are arranged circumferentially according to the number of the outermost main steel bars, and 1 protection layer control component is arranged longitudinally every 1 - 2 m.

[0019] Preferably, the operation opening is a rectangular opening, the concrete cushion block is a cuboid structure, and the size of the surface of the concrete cushion block that abuts against the operation opening is slightly smaller than the size of the operation opening.

[0020] Preferably, an adhesive layer is coated at the fitting and abutting surface of the hemispherical recessed portion and the hemispherical protrusion portion.

[0021] Preferably, the radius of the hemispherical recessed part is 0.4 - 0.5 times the thickness of the concrete cushion block.

[0022] In a second aspect, a construction method for a bridge pier column facilitating the control of the thickness of the steel bar protection layer is characterized by comprising the following steps: S1. Bind and install the steel bar cage on the pier in the conventional method. S2. According to the positions of the main steel bars of the steel bar cage and the designed layout positions of the protection layer control components, pre-open operation openings on the steel formwork and install operation covers, and then install the steel formwork on the periphery of the steel bar cage to form a construction space for pouring the bridge pier column and reserve positions for the steel bar protection layer, and make each operation opening on the steel formwork correspond one by one to the designed layout positions of the protection layer control components. S3. After the steel bar cage and the steel formwork are installed, open the operation cover, weld the fixing nuts to the main steel bars at the corresponding positions through the operation openings, and then screw the adjusting screw into the nuts to initially fix the hemispherical convex part, and leave a proper installation space for the concrete cushion block between the hemispherical convex part and the operation opening; then horizontally insert the concrete cushion block into the operation opening along with the size of the operation opening and rotate it 90 degrees, align the operation hole with the cross opening, and then screw out the adjusting screw through the cross opening, so that the adjusting screw drives the hemispherical convex part to move towards the hemispherical recessed part of the concrete cushion block until the hemispherical recessed part on one side of the concrete cushion block is fitted and abutted against the hemispherical convex part, and the upper and lower ends on the other side of the concrete cushion block are respectively abutted against the upper and lower ends of the operation opening to transfer the supporting force to the steel formwork. At this time, the installation of the protection layer control components is completed; according to this step, install the protection layer control components at different positions through each operation opening from bottom to top and along the circumferential direction in turn. S4. Fill the operation holes of the protection layer control components with cement mortar, and then cover the operation cover. S5. Carry out the concrete pouring construction in the conventional method.

[0023] Compared with the prior art, the beneficial effects of the present invention are as follows: 1) The present invention adopts the cooperation of fixing nuts, adjusting screws and concrete cushion blocks. Among them, the concrete cushion block is used as a protective connection and support structure to abut against the steel formwork, isolating the adjusting screw, and can avoid the problem of the primary battery reaction of the stainless steel adjusting screw corroding the steel bars of the bridge pier column. The present invention can rotate the adjusting screw as needed through the cooperation of the adjusting screw and the fixing nut to adapt to the control of different thicknesses of the steel bar protection layer. In the present invention, the fixing nuts, adjusting screws and concrete cushion blocks are common materials, with low acquisition cost and guaranteed construction quality.

[0024] 3) In the present invention, the fixing nut is welded to the main reinforcement bars of the steel reinforcement cage. The overall connection strength is high, and it can withstand the impact caused by the adjustment of the pier column formwork and the impact and vibration during concrete pouring without falling off, ensuring that the cover thickness meets the requirements. In addition, by providing a hemispherical protrusion on the adjusting screw rod and a hemispherical recess on the concrete cushion block to fit with the hemispherical protrusion, the present invention can match or adapt to the position offset of the fixing nut and the adjusting screw rod in any orientation, with higher connection flexibility.

[0025] 3) By opening an operation opening on the steel formwork and providing a hemispherical recess and an operation hole that penetrate successively on the concrete cushion block, the present invention enables tools such as screwdrivers to be inserted into the operation opening, the operation hole, and the hemispherical recess in sequence from the outside of the formwork after closing the formwork to connect with the cross opening, thereby realizing the installation of the cover control assembly and the fine adjustment of the steel bar cover thickness. Workers do not need to climb over the formwork to operate inside the steel reinforcement cage, effectively avoiding potential safety hazards caused by working at heights and in confined spaces.

[0026] In summary, the construction structure of the bridge pier column of the present invention is simple in structure and ingenious in design, and preferably solves many problems existing in the traditional method of controlling the steel bar cover thickness, such as unstable fixation of the concrete cushion block, galvanic cell reaction of stainless steel components to corrode the steel bars of the bridge pier column, difficult control of the installation position and installation angle during the welding of the fixing nut, and inability to adjust the thickness of the steel bar control layer after closing the formwork. It has good promotion and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the top view structure diagram of the construction structure of the bridge pier column of the present invention; Figure 2 is the front view of the construction structure of the bridge pier column of the present invention (the operation cover plate is omitted); Figure 3 is Figure 1 the enlarged schematic view at A in Figure 4 is Figure 3 the schematic diagram when the installation position of the fixing nut in Figure 5 is Figure 3 the sectional view taken along B-B in Figure 6 is the sectional view of the concrete cushion block; Figure 7 is the installation schematic diagram of the cover control assembly; Figure 8 is the three-dimensional structure schematic diagram of the operation opening and the operation cover plate; The meanings of the various markings in the above figures are as follows: steel reinforcement cage 1, main reinforcement bars 101, steel formwork 2, protective layer control assembly 3, fixing nut 4, adjusting screw 5, hemispherical convex portion 6, concrete cushion block 7, hemispherical concave portion 8, operation hole 9, cement mortar 10, operation opening 11, operation cover plate 12, connecting bars 13, cross-shaped opening 14, adhesive layer 15, screwdriver 16. Specific embodiments

[0028] The present invention will be further described below in the form of specific embodiments in conjunction with the accompanying drawings. It should be noted that the following embodiments are only illustrative explanations of the present invention by way of example, but the protection scope of the present invention is not limited thereto. The described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention. Embodiment 1

[0029] This embodiment provides a bridge pier construction structure for facilitating the control of the protective layer thickness. Please refer to Figures 1 to 6 , including a steel reinforcement cage 1, a steel formwork 2 surrounding and arranged on the periphery of the steel reinforcement cage 1 to form a construction space for pouring the bridge pier, and a protective layer control assembly 3 arranged between the steel formwork 2 and the steel reinforcement cage 1; an operation opening 11 is provided on the steel formwork 2 at the position where the protective layer control assembly 3 is arranged, and an operation cover plate 12 that can be freely opened and closed is covered on the operation opening 11; the protective layer control assembly 3 includes a fixing nut 4 welded to the main reinforcement bars 101 of the steel reinforcement cage 1, an adjusting screw 5 threadedly connected to the fixing nut 4, a hemispherical convex portion 6 coaxially arranged with respect to the fixing nut 4 at the other end of the adjusting screw 5, a cross-shaped opening 14 coaxially arranged with the adjusting screw 5 on the convex side of the hemispherical convex portion 6, and a concrete cushion block 7; the concrete cushion block 7 is successively provided with a hemispherical concave portion 8 and an operation hole 9 that communicate with each other in the middle position along its thickness direction, and the operation hole 9 is filled with cement mortar 10; the hemispherical concave portion 8 on one side of the concrete cushion block 7 is fitted and abutted against the hemispherical convex portion 6, and the upper and lower ends of the other side of the concrete cushion block 7 are respectively abutted against the upper and lower ends of the operation opening 11, so that the protective layer control assembly 3 is supported between the steel reinforcement cage 1 and the steel formwork 2 to control the protective layer thickness during the construction of the bridge pier; In the above structure, the concrete cushion block 7 is the same as a conventional concrete cushion block, which is prefabricated in batches in advance at the factory according to the required dimensions. However, the concrete cushion block 7 of the present invention is also provided with a hemispherical recessed portion 8 and an operation hole 9 that penetrate successively. The concrete cushion block 7 is used as a protective connection support structure to abut against the steel formwork, solving the drawback that the primary battery reaction is likely to occur when the stainless steel member contacts the steel formwork. The hemispherical recessed portion 8 is used to fit and abut against the hemispherical convex portion 6, having better connection flexibility. The operation hole 9 facilitates the tool to pass through and connect with the cross port 14 to rotate the adjusting screw 5; the fixing nut 4 is fixed on the main stress-bearing steel bars of the main reinforcement of the pier column steel reinforcement cage 1 by welding, which can strengthen the connection strength between the protective layer control assembly and the steel bars, avoiding the situation that the strong protective layer control assembly loosens and falls off due to factors such as formwork adjustment extrusion and concrete pouring impact, resulting in too large deviation of the protective layer thickness; by the cooperation of the adjusting screw 5 and the fixing nut 4, the adjusting screw 5 can be rotated as needed to control different thicknesses of the steel bar protective layer; the cement mortar 10 can effectively block the operation hole 9 after the protective layer control assembly 3 is installed; in addition, as Figure 3 and Figure 4 shown, due to the small volume and mass of the fixing nut 4 in actual operation, the opening size of the operation port 11 is limited, and it is a high-altitude operation. Therefore, it is difficult to ensure the accuracy of the installation position and installation angle of the fixing nut 4 during welding, that is, the axis of the screw hole of the fixing nut 4 will deviate from the center position of the operation port 11, so that when the adjusting screw 5 is threadedly connected with the fixing nut 4, it will deviate from the designed position, and thus it is difficult to form an effective support for the concrete cushion block 7. By providing a hemispherical convex portion 6 at one end of the adjusting screw 5 and a hemispherical recessed portion 8 on one side of the concrete cushion block 7, and the hemispherical recessed portion 8 is fitted and abutted against the hemispherical convex portion 6, it can match or adapt to the position offset in any orientation of the fixing nut 4 and the adjusting screw 5, with higher connection flexibility; in addition, the present invention opens the operation port 11 on the steel formwork 2 and provides the hemispherical recessed portion 8 and the operation hole 9 that penetrate successively on the concrete cushion block 7, so that after the formwork is closed, tools such as screwdrivers can be successively inserted into the operation port 11, the operation hole 9 and the hemispherical recessed portion 8 from the outside of the formwork to connect with the cross port, and then the installation of the protective layer control assembly 3 and the fine adjustment of the steel bar protective layer thickness can be realized. Workers do not need to climb over the formwork and enter the steel reinforcement cage for operation, which can effectively avoid the safety hazards brought by high-altitude and confined space operations.

[0030] In order to ensure that the strength of the hemispherical convex portion meets the requirements, further, in a preferred embodiment, the hemispherical convex portion 6 is made of cast iron or steel, and the hemispherical convex portion 6 is connected with the adjusting screw 5 to form an integral structure.

[0031] Further, in a preferred embodiment, the radius of the hemispherical recessed portion 8 in the concrete cushion block is not less than 3 cm, and the thickness of the concrete cushion block is not less than 6 cm to ensure the fitting connection strength between the hemispherical recessed portion 8 and the hemispherical convex portion 6.

[0032] Further, in a preferred embodiment, refer to Figure 3 and Figure 5 , the protective layer control assembly 3 further includes a connecting rib 13 coaxially arranged with the adjusting screw 5 on the convex side of the hemispherical convex portion 6, the connecting rib 13 extends into the operation hole 9, and the cross opening 12 is arranged at the outer end of the connecting rib 13; based on this structural arrangement, the cement mortar 10 filled in the operation hole 9 can bond with the connecting rib 13, thereby strengthening the overall connection strength between the adjusting screw and the concrete cushion block 7, and at the same time facilitating an external tool such as a screwdriver to pass through the operation hole 9 and connect with the cross opening 12 to turn the adjusting screw 5; and, in a preferred embodiment, the operation hole 9 is a tapered hole, its larger hole opening is connected to the operation opening 11, and its smaller hole opening is communicated with the hemispherical recessed portion 8; based on this, when the position of the adjusting screw 5 is offset, for example, it is not perpendicular to the concrete cushion block 7, the corresponding connecting rib 13 will form a certain angle with the center line of the operation hole 9, and the operation hole 9 is arranged as a tapered hole with the above structure, which can facilitate an external tool such as a screwdriver to obliquely pass through the operation hole 9 and dock with the cross opening 12.

[0033] For the convenience of covering and fixing the operation cover plate 12, further, in a preferred embodiment, refer to Figure 8 , one side of the operation cover plate 12 is hinged to one side of the operation opening 11, and the other side of the operation cover plate 12 is connected to the other side of the operation opening 11 through a fastener.

[0034] Further, in a preferred embodiment, refer to Figure 8 , the interface edges of the operation opening 11 and the operation cover plate 12 are arranged to be inclined and fitted to each other, so that when the operation cover plate 12 covers the operation opening 11, the two fit and seal, thereby preventing the leakage of mortar at the operation opening during concrete pouring; preferably, the interface edges of the operation opening 11 and the interface edges of the operation cover plate 12 are both inclined at 45° from the outside to the inside.

[0035] Further, in a preferred embodiment, the protective layer control assemblies 3 are uniformly arranged in the annular space between the steel formwork 2 and the steel reinforcement cage 1, and 3 - 4 protective layer control assemblies 3 are arranged circumferentially according to the number of the outermost main reinforcements, and 1 protective layer control assembly 3 is arranged longitudinally at intervals of 1 - 2 m.

[0036] Further, in a preferred embodiment, refer to Figure 2 and Figure 8, the operation opening 11 is a rectangular opening, the concrete cushion block 7 is a cuboid structure, and the size of the surface of the concrete cushion block 7 in contact with the operation opening 11 is slightly smaller than the size of the operation opening 11, so that the concrete cushion block 7 can be put into the steel formwork through the operation opening 11. Usually, it is sufficient to control that the length and width of the operation opening 11 are 0.3 - 0.5 cm larger than the length and width of the surface of the concrete cushion block 7 in contact with the operation opening 11.

[0037] Furthermore, in a preferred embodiment, please refer to Figure 3 , an adhesive layer 15 is coated at the fitting and abutting surface between the hemispherical recessed portion 8 and the hemispherical protruding portion 6. The adhesive layer 15 is formed by coating construction glue. During specific operation, the construction glue can be first coated on the surface of the hemispherical recessed portion 8 or the surface of the hemispherical protruding portion 6. When the hemispherical recessed portion 8 and the hemispherical protruding portion 6 are fitted, the adhesive layer 15 can be formed after the construction glue solidifies. Through the bonding of the adhesive layer 15, firstly, the connection strength between the hemispherical recessed portion 8 and the hemispherical protruding portion 6 can be enhanced, and secondly, a seal can be formed between the hemispherical recessed portion 8 and the hemispherical protruding portion 6, so as to avoid the formation of a water seepage channel at the connection seam between the hemispherical recessed portion 8 and the hemispherical protruding portion 6 and prevent the occurrence of galvanic reaction.

[0038] Furthermore, in a preferred embodiment, the radius of the hemispherical recessed portion 8 is 0.4 - 0.5 times the thickness of the concrete cushion block 7. Example 2

[0039] This embodiment provides a construction method for bridge piers that is convenient for controlling the thickness of the protective layer. Please refer to Figure 7 , which includes the following steps: S1. Design and process the protective layer control component 3 according to the thickness of the steel bar protective layer. The radius of the hemispherical recessed portion 8 in the concrete cushion block is not less than 3 cm, and the thickness of the concrete cushion block is not less than 6 cm to ensure the fitting connection strength between the hemispherical recessed portion 8 and the hemispherical protruding portion 6; S2. Bind and install the steel reinforcement cage 1 on the pile cap by the conventional method; S3. According to the positions of the main steel bars of the steel reinforcement cage 1, the designed layout positions of the protective layer control component 3, and the dimensions of the concrete cushion block, pre - open operation openings 11 on the steel formwork 2 and install operation covers 12, and then install the steel formwork 2 on the periphery of the steel reinforcement cage 1 to form a construction space for pouring the bridge pier and reserve positions for the steel bar protective layer, and make each operation opening 11 on the steel formwork 2 correspond to the designed layout positions of the protective layer control component 3 one by one; S4. After the steel reinforcement cage 1 and the steel formwork 2 are installed, open the operation cover plate 12, weld the fixing nut 4 to the main reinforcement at the corresponding position through the operation port 11, then screw the adjusting screw 5 into the nut 4 to preliminarily fix the hemispherical convex part 6, and leave a proper installation space for the concrete cushion block 7 between the hemispherical convex part 6 and the operation port 11; then apply construction glue on the surface of the hemispherical concave part 8 of the concrete cushion block 7, horizontally insert the concrete cushion block 7 into the operation port 11 according to the size of the operation port 11 and then rotate it by 90 degrees, align the operation hole 9 with the cross-shaped port 14, and then use a screwdriver 16 to sequentially pass through the operation hole 9 and the hemispherical concave part 8 to embed the end of the screwdriver 16 into the cross-shaped port 14, and slowly screw out the adjusting screw 5 through the cross-shaped port 14, so that the adjusting screw 5 drives the hemispherical convex part 6 to move towards the hemispherical concave part 8 of the concrete cushion block 7 until the hemispherical concave part 8 on one side of the concrete cushion block 7 is engaged and abutted with the hemispherical convex part 6, and the upper and lower ends on the other side of the concrete cushion block 7 are respectively abutted with the upper and lower ends of the operation port 11 to transfer the supporting force to the steel formwork, and at this time the installation of the protective layer control assembly 3 is completed; according to this step, install the protective layer control assemblies 3 at different positions sequentially along the circumferential direction from bottom to top through each operation port 11; S5. Fill the operation hole 9 of the protective layer control assembly 3 with cement mortar 10, and then cover the operation cover plate 12; S6. Carry out concrete pouring construction according to the conventional method.

Claims

1. A bridge pier construction structure that facilitates controlling the thickness of a steel bar protective layer, comprising a steel cage (1), and a steel formwork (2) that is arranged around the steel cage (1) to form a construction space for pouring the bridge pier, characterized in that: Also includes: A protective layer control component (3) is arranged between a steel formwork (2) and a steel cage (1); the steel formwork (2) is provided with an operation opening (11) at a position where the protective layer control component (3) is arranged, and an operation cover (12) that can be opened and closed freely is covered on the operation opening (11); the protective layer control component (3) comprises a fixing nut (4) welded to a main bar of the steel cage (1), an adjusting screw (5) threadedly connected to the fixing nut (4), a hemispherical protrusion (6) coaxially arranged at the other end of the adjusting screw (5) relative to the fixing nut (4), and a hemispherical protrusion (6) coaxially arranged at the hemispherical protrusion with the adjusting screw (5). (6) a cross opening (14) on the raised side, a concrete pad (7); the concrete pad (7) is provided with mutually interpenetrating hemispherical recessed portions (8) and operating holes (9) in sequence at the middle position along the thickness direction thereof, and the operating hole (9) is filled with cement mortar (10); the hemispherical recessed portion (8) on one side of the concrete pad (7) is engaged with the hemispherical raised portion (6), and the upper and lower ends of the other side of the concrete pad (7) are respectively engaged with the upper and lower ends of the operating opening (11), so that the protective layer control component (3) is supported between the steel cage (1) and the steel formwork (2) to control the thickness of the steel protective layer during the construction of the bridge pier.

2. A bridge pier construction structure that facilitates controlling the thickness of the steel bar protective layer as claimed in claim 1, characterized in that: The protective layer control assembly (3) further comprises a connecting rib (13) coaxially arranged with the adjusting screw (5) on the raised side of the hemispherical raised portion (6), the connecting rib (13) extending into the operating hole (9), and the cross opening (12) being arranged at the outer end of the connecting rib (13).

3. A bridge pier construction structure that facilitates controlling the thickness of the steel bar protective layer as claimed in claim 2, characterized in that: The operating hole (9) is a conical hole, the larger hole of which is connected to the operating port (11), while the smaller hole is connected to the hemispherical concave portion (8).

4. A bridge pier construction structure that facilitates controlling the thickness of the steel bar protective layer as claimed in claim 1, characterized in that: One side of the operation cover plate (12) is hinged to one side of the operation opening (11), and the other side of the operation cover plate (12) is connected to the other side of the operation opening (11) via a fastener.

5. A bridge pier construction structure that facilitates controlling the thickness of the steel bar protective layer as claimed in claim 1, characterized in that: The interface edges of the operation opening (11) and the operation cover plate (12) are arranged to be tilted and fitted with each other, so that when the operation cover plate (12) covers the operation opening (11), the two fit and seal, thereby preventing leakage of concrete at the operation opening when pouring concrete.

6. A bridge pier construction structure that facilitates controlling the thickness of the steel bar protective layer as claimed in claim 1, characterized in that: The protective layer control components (3) are evenly arranged in the annular space between the steel formwork (2) and the steel cage (1), and 3-4 protective layer control components (3) are arranged in the annular direction according to the number of the outermost main reinforcements, and one protective layer control component (3) is arranged at intervals of 1-2 m in the longitudinal direction.

7. A bridge pier construction structure that facilitates controlling the thickness of the steel bar protective layer as claimed in claim 1, characterized in that: The operating port (11) is a rectangular opening, the concrete pad (7) is a rectangular parallelepiped structure, and the size of a surface of the concrete pad (7) abutting against the operating port (11) is slightly smaller than the size of the operating port (11).

8. A bridge pier construction structure that facilitates controlling the thickness of the steel bar protective layer as claimed in claim 1, characterized in that: An adhesive layer (15) is coated on the mating contact surfaces of the hemispherical concave portion (8) and the hemispherical convex portion (6).

9. A bridge pier construction structure that facilitates controlling the thickness of the steel bar protective layer as claimed in claim 1, characterized in that: The radius of the hemispherical concave portion (8) is 0.4-0.5 times the thickness of the concrete pad (7).

10. A bridge pier construction method that is convenient for controlling the thickness of the steel bar protective layer, characterized in that: The steps include: S1. Tie and install the steel cage (1) on the cap according to conventional methods; S2. According to the position of the main reinforcement of the reinforcement cage (1) and the designed layout position of the protective layer control component (3), an operation opening (11) is pre-opened on the steel template (2) and an operation cover plate (12) is installed. Then, the steel template (2) is installed on the side of the reinforcement cage (1) to form a construction space for pouring the bridge pier and a position for reserving the reinforcement protective layer, and each operation opening (11) on the steel template (2) corresponds to the designed layout position of the protective layer control component (3) one by one; S3. After the steel cage (1) and the steel formwork (2) are installed, the operation cover (12) is opened, and the fixing nut (4) is welded to the main reinforcement at the corresponding position through the operation opening (11), and then the adjusting screw (5) is screwed into the nut (4) to initially fix the hemispherical protrusion (6), and a suitable installation space for the concrete pad (7) is left between the hemispherical protrusion (6) and the operation opening (11); then the concrete pad (7) is inserted into the operation opening (11) in accordance with the size of the operation opening (11) and then rotated 90 degrees, and the operation hole (9) is aligned with the cross opening (14), and then the concrete pad (7) is inserted into the operation opening (11) through the cross opening (14). The adjusting screw (5) is screwed out of the opening (14), so that the adjusting screw (5) drives the hemispherical protrusion (6) to move toward the hemispherical concave portion (8) of the concrete pad (7), until the hemispherical concave portion (8) on one side of the concrete pad (7) is engaged with the hemispherical protrusion (6), and the upper and lower ends of the other side of the concrete pad (7) are respectively abutted against the upper and lower ends of the operating opening (11), so that the supporting force is transmitted to the steel formwork, and the installation of the protective layer control component (3) is completed at this time; according to this step, the protective layer control components (3) at different positions are installed from bottom to top and in the circumferential direction through each operating opening (11); S4, filling cement mortar (10) into the operating hole (9) of the protective layer control component (3), and then covering the operating cover plate (12); S5. Carry out concrete pouring construction according to conventional methods.

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