Bridge pier column construction structure capable of conveniently controlling thickness of steel bar protection layer

Abstract

The utility model discloses a bridge pier column construction structure capable of conveniently controlling the thickness of a steel bar protection layer. The bridge pier column 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 utility model belongs to bridge construction technical field, concretely relates to a bridge pier construction structure convenient to control reinforcing cover thickness. BACKGROUND

[0002] Highway engineering, municipal road engineering and railway engineering are generally related to bridge pier construction. With the maturity of bridge construction technology, the quality control index requirements are also higher and higher. Among them, the reinforcing cover control is an important control parameter of bridge structure construction, and the reinforcing cover directly affects the durability of the bridge structure and even the structural safety. If the reinforcing cover is too large, cracks are easily generated on the surface of the concrete, affecting the structural safety. If the reinforcing cover is too small, the reinforcing steel bars cannot be effectively protected, and the reinforcing steel bars are easily corroded, expanded in volume, and then expanded to break the concrete. After the concrete is damaged, the reinforcing steel bars are also corroded, causing a vicious cycle of reinforcing steel bar corrosion-concrete damage-reinforcing steel bar corrosion.

[0003] At present, the bridge pier construction mainly uses concrete pads to control the thickness of the reinforcing cover. The method is to directly bind the concrete pads in a quincunx shape on the main reinforcement by using wire, and to control the number of concrete pads per square meter to be not less than 4. The wire head is bent inward. This method is simple to operate and has high work efficiency, but also has certain problems.

[0004] 1. The concrete pads are fixed by wire, and the connection strength is low. During construction, the concrete pads are easily squeezed and bumped by the formwork, causing the concrete pads to move or fall, thereby causing inaccurate control of the thickness of the reinforcing cover.

[0005] 2. The pads are usually prefabricated in the factory, and the size is fixed. The applicability of different reinforcing cover thickness controls is poor.

[0006] 3. During construction, the concrete pads are first fixed by wire, and then the steel formwork is installed. In this way, it is difficult to adjust the thickness of the reinforcing cover after the mold is closed.

[0007] With the increasing demand for bridge construction quality, people have gradually paid attention to the research on the thickness control of the reinforcing cover of the bridge pier. For example, the Chinese utility model patent (application number 201620445974.5) discloses a device for controlling the thickness of the reinforcing cover of the bridge pier, which proposes a structure of a screw rod and a nut. The upper end of the nut has a closed head, and the inner wall of the closed head is provided with a thread matched with the screw rod. The stainless steel screw rod is welded on the reinforcing steel bar. By rotating the nut, the distance from the closed head to the reinforcing steel bar framework is adjusted to the thickness of the reinforcing cover. The construction progress and construction quality can be doubled.

[0008] Through retrieval, the prior art also discloses some similar steel bar protective layer control devices to realize accurate control of the thickness of the steel bar protective layer, but most of them are stainless steel components, and the following problems still exist when used.

[0009] 1. The stainless steel protective layer control device generally needs to be welded on the main reinforcement to ensure the connection strength, and then the stainless steel protective layer control device plays a role in controlling the thickness of the steel bar protective layer by supporting the formwork, but the volume of the stainless steel protective 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.

[0010] 2. After the pier column construction is completed, the top end of the stainless steel nut greatly reduces the thickness of the concrete protective layer, and even locally contacts the air directly. Although stainless steel is not easy to rust, it is welded and connected with the steel reinforcement cage, and the stainless steel nut directly contacts the rainwater on a rainy day, a water seepage channel is formed at the contact interface between the stainless steel nut and the concrete, an electrolyte environment is formed near the steel reinforcement cage, a primary cell reaction is generated, the rusting speed of the steel reinforcement cage connected with the protective layer control device is accelerated, thereby causing the steel reinforcement to rust and affecting the stress and durability of the pier column.

[0011] 3. The stainless steel protective layer control device directly contacts the steel formwork, and when the steel formwork is adjusted, the stainless steel protective layer control device abuts against the formwork. Since the stainless steel protective layer control device has high strength and the contact area between the stainless steel nut and the formwork is small, a dent is easily left on the surface of the formwork, and the formwork will be damaged after being used for many times, thereby causing poor flatness of the outer surface of the pier column during construction.

[0012] 4. The stainless steel protective layer control device generally needs to be installed and fixed after the steel reinforcement is installed and before the formwork is closed, and if the thickness of the steel bar protective layer does not meet the requirements, the formwork needs to be turned over to adjust the steel reinforcement cage inside, and for a pier column with small structure size, the operation space is small and it is difficult to adjust. Utility model content

[0013] In view of the above problems, the purpose of the utility model is to provide a bridge pier column construction structure capable of conveniently controlling the thickness of a steel bar protective layer.

[0014] The utility model realizes the purpose by the following technical scheme.

[0015] The utility model provides a kind of bridge pier construction structure of reinforcing cover thickness is convenient to control, including reinforcement cage, steel formwork is enclosed and is set in the position of reinforcement cage and is formed pouring bridge pier construction space, its characterized in that, further include: the cover control component of being set between steel formwork and reinforcement cage;The steel formwork is opened with operating opening at the position of setting cover control component, operating cover plate that can be freely opened and closed is covered on the operating opening;The cover control component includes fixed nut that is welded and set on the reinforcement cage main reinforcement, adjusting screw that is threadedly connected with fixed nut, hemispherical protruding portion that is coaxially arranged on the other end of adjusting screw relative to fixed nut, cross mouth that is coaxially arranged on the protruding side of hemispherical protruding portion with adjusting screw, concrete pad;The concrete pad is sequentially opened with hemispherical recess and operating hole that are mutually penetrated in the middle position along its thickness direction, and the operating hole is filled with cement mortar;The hemispherical recess of one side of the concrete pad is embedded and abuts with hemispherical protruding portion, and the upper and lower ends of the other side of the concrete pad are respectively abutted with the upper and lower ends of operating opening, so as to make cover control component support between reinforcement cage and steel formwork to control the reinforcing cover thickness when bridge pier construction.

[0016] Preferably, the cover control component further includes a connecting rib coaxially arranged on the protruding side of the hemispherical protruding portion with the adjusting screw, the connecting rib extends into the operating hole, and the cross mouth is arranged at the outer end of the connecting rib.

[0017] Preferably, the operating hole is a tapered hole, the larger hole opening of the operating hole is connected with the operating opening, and the smaller hole opening of the operating hole is connected with the hemispherical recess.

[0018] Preferably, one side of the operating cover plate is hinged with one side of the operating opening, and the other side of the operating cover plate is connected with the other side of the operating opening through a buckle.

[0019] Preferably, the interface edges of the operating opening and the operating cover plate are arranged to be mutually inclined and attached, so that when the operating cover plate is covered on the operating opening, the operating cover plate and the operating opening are attached and sealed, thereby preventing mortar leakage at the operating opening when pouring concrete.

[0020] Preferably, the cover control components are uniformly arranged in the annular space between the steel formwork and the reinforcement cage, and the number of the cover control components arranged in the circumferential direction is 3-4 according to the number of the outermost main reinforcement, and one cover control component is arranged every 1-2m in the longitudinal direction.

[0021] Preferably, the operating opening is a rectangular opening, the concrete pad is a cuboid structure, and the size of the surface of the concrete pad abutting with the operating opening is slightly smaller than the size of the operating opening.

[0022] Preferably, a glue layer is coated on the embedded abutting surface of the hemispherical recess and the hemispherical protruding portion.

[0023] Preferably, the radius of the hemispherical recess is 0.4-0.5 times the thickness of the concrete pad.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] 1) This utility model employs a fixed nut, an adjusting screw, and a concrete pad. The concrete pad acts as a protective connecting support structure, abutting against the steel formwork and isolating the adjusting screw. This avoids the problem of corrosion of the bridge pier reinforcement caused by the galvanic reaction of the stainless steel adjusting screw. Through the cooperation of the adjusting screw and the fixed nut, this utility model allows for the adjustment of the screw to control different thicknesses of the reinforcement protective layer as needed. In this utility model, the fixed nut, adjusting screw, and concrete pad are common materials, resulting in low acquisition costs and ensuring construction quality.

[0026] 3) This utility model uses a fixing nut welded to the main reinforcement of the steel cage, resulting in high overall connection strength. It can withstand the impact of adjusting the pier formwork, as well as the impact and vibration during concrete pouring, without detaching, ensuring the protective layer thickness meets requirements. Furthermore, by providing a hemispherical protrusion on the adjusting screw and a hemispherical recess on the concrete pad to engage with the protrusion, this utility model can match or adapt to any positional offset of the fixing nut and adjusting screw, offering greater connection flexibility.

[0027] 3) This utility model, by opening an operating opening on the steel formwork and setting sequentially penetrating hemispherical recesses and operating holes on the concrete pad, allows for the use of tools such as screwdrivers to sequentially insert into the operating opening, operating holes, hemispherical recesses, and cross-shaped openings after the formwork is closed. This enables the installation of the protective layer control components and the fine adjustment of the thickness of the reinforcing steel protective layer. Workers do not need to climb over the formwork to enter the reinforcing cage to operate, effectively avoiding safety hazards caused by working at height and in confined spaces.

[0028] In summary, the bridge pier construction structure of this utility model is simple in structure and ingenious in design. It effectively solves many problems that exist in traditional methods for controlling the thickness of the concrete protective layer, such as unstable fixing of concrete pads, corrosion of bridge pier reinforcement by galvanic reaction of stainless steel components, difficulty in controlling the installation position and angle of the fixing nut during welding, and inability to adjust the thickness of the reinforcement control layer after formwork closure. It has good promotion and practical value. Attached Figure Description

[0029] Figure 1 This is a top view of the bridge pier construction structure of this utility model;

[0030] Figure 2 This is a front view of the bridge pier construction structure of this utility model (excluding the operating cover plate).

[0031] Figure 3 for Figure 1Enlarged view of the middle A;

[0032] Figure 4 For Figure 3 Schematic view of the middle fixed nut installation position offset;

[0033] Figure 5 For Figure 3 Sectional view of the middle B-B;

[0034] Figure 6 Sectional view of the concrete pad;

[0035] Figure 7 Schematic view of the installation of the protective layer control assembly;

[0036] Figure 8 Schematic view of the stereoscopic structure of the operation hole and the operation cover plate;

[0037] The meanings of the various indications in the above figures are as follows: steel reinforcement cage 1, main reinforcement 101, steel formwork 2, protective layer control assembly 3, fixed nut 4, adjusting screw 5, hemispherical convex portion 6, concrete pad 7, hemispherical concave portion 8, operation hole 9, cement mortar 10, operation hole 11, operation cover plate 12, connecting reinforcement 13, cross hole 14, adhesive layer 15, screwdriver 16. DETAILED DESCRIPTION

[0038] The utility model will be further described in the form of specific embodiments in combination with the drawings. It should be pointed out that the following embodiments are only explanatory descriptions of the utility model in the form of examples, but the protection scope of the utility model is not limited to this. The described embodiments are only a part of the embodiments of the utility model, but not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without creative labor belong to the protection scope of the utility model. Embodiment 1

[0039] This embodiment provides a bridge pier column construction structure convenient for controlling the thickness of the protective layer. Please refer to Figures 1 to 6, including steel cage 1, enclosed in the steel cage 1 side forming pouring bridge pier column construction space of steel formwork 2, set between the steel formwork 2 and the steel cage 1 of the protective layer control assembly 3;The steel formwork 2 is provided with an operating port 11 at the position of the protective layer control assembly 3, and the operating cover plate 12 capable of being freely opened and closed is combined on the operating port 11;The protective layer control assembly 3 includes a fixed nut 4 welded on the main reinforcement 101 of the steel cage 1, an adjusting screw 5 threadedly connected with the fixed nut 4, a hemispherical protruding portion 6 coaxially arranged on the other end of the adjusting screw 5 relative to the fixed nut 4, a cross port 14 coaxially arranged on the protruding side of the hemispherical protruding portion 6, and a concrete block 7;The concrete block 7 is sequentially provided with a hemispherical recessed portion 8 and an operating hole 9 penetrating each other at the middle position along the thickness direction, and the operating hole 9 is filled with cement mortar 10;The hemispherical recessed portion 8 on one side of the concrete block 7 is embedded and abutted with the hemispherical protruding portion 6, and the upper and lower ends of the other side of the concrete block 7 are respectively abutted with the upper and lower ends of the operating port 11, so that the protective layer control assembly 3 is supported between the steel cage 1 and the steel formwork 2 to control the thickness of the protective layer during the construction of the bridge pier column;

[0040] In the above structure, the concrete block 7 is the same as the conventional concrete block, which is prefabricated in batches in the factory according to the required size, but the concrete block 7 of the utility model is further provided with a hemispherical recessed portion 8 and an operating hole 9 penetrating each other, wherein the concrete block 7 is used as a protective connection support structure for abutting with the steel formwork, solving the problem that the stainless steel component is easy to produce primary cell reaction when contacting with the steel formwork, and the hemispherical recessed portion 8 is used for embedded abutment with the hemispherical protruding portion 6, which has better connection flexibility, and the operating hole 9 can facilitate the tool to pass through and rotate the adjusting screw 5 connected with the cross port 14;The fixed nut 4 is fixed on the main reinforcement of the pier steel cage 1 by welding, which can strengthen the connection strength between the protective layer control assembly and the steel bar, and avoid the situation that the protective layer control assembly is loose and falls off due to factors such as template adjustment extrusion and concrete pouring impact, resulting in excessive deviation of the thickness of the protective layer;By adjusting the screw 5 and the fixed nut 4, the adjusting screw 5 can be rotated as needed to control the different thicknesses of the steel protective layer;The cement mortar 10 can effectively plug the operating hole 9 after the installation of the protective layer control assembly 3;In addition, such as Figure 3 and Figure 4As shown, due to the small volume and mass of the fixing nut 4 in actual operation, the opening size of the operation opening 11 is limited, and it is difficult to ensure the accuracy of the installation position and the 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 opening 11, so that the adjustment screw 5 will deviate from the designed position when being threadedly connected with the fixing nut 4, and it is difficult to effectively support the concrete pad 7. By providing the half-ball protruding part 6 at one end of the adjustment screw 5 and the half-ball recessed part 8 at one side of the concrete pad 7, the half-ball recessed part 8 and the half-ball protruding part 6 are embedded and abutted, which can match or adapt to the position deviation of the fixing nut 4 and the adjustment screw 5 in any direction, and the connection flexibility is higher. In addition, the operation opening 11 is formed on the steel formwork 2, and the half-ball recessed part 8 and the operation hole 9 are sequentially and continuously formed on the concrete pad 7, so that the screwdriver and other tools can be sequentially inserted into the operation opening 11, the operation hole 9 and the half-ball recessed part 8 outside the formwork after the formwork is closed, and then connected with the cross opening, thereby realizing the installation of the protective layer control assembly 3 and the fine adjustment of the thickness of the steel bar protective layer, and the worker does not need to operate in the steel bar cage by turning over the formwork, and the safety hidden danger caused by high-altitude and limited space operation can be effectively avoided.

[0041] In order to ensure that the strength of the half-ball protruding part meets the requirements, further, in a preferred embodiment, the half-ball protruding part 6 is made of cast iron or steel material, and the half-ball protruding part 6 is connected with the adjustment screw 5 to form an integral structure.

[0042] Further, in a preferred embodiment, the radius of the half-ball recessed part 8 in the concrete pad is not less than 3 cm, and the thickness of the concrete pad is not less than 6 cm, so as to ensure the embedding connection strength of the half-ball recessed part 8 and the half-ball protruding part 6.

[0043] Further, in a preferred embodiment, please refer to Figure 3 and Figure 5 , the protective layer control assembly 3 further comprises a connecting rib 13 coaxially arranged on the protruding side of the half-ball protruding part 6 and arranged in the operation hole 9, and the cross opening 12 is arranged at the outer end of the connecting rib 13; based on the structure, the cement mortar 10 filled in the operation hole 9 can be bonded with the connecting rib 13, so as to strengthen the overall connection strength of the adjustment screw and the concrete pad 7, and also facilitate the external tool such as the screwdriver to pass through the operation hole 9 and be connected with the cross opening 12 to rotate the adjustment screw 5; and in a preferred embodiment, the operation hole 9 is a tapered hole, the larger hole is connected with the operation opening 11, and the smaller hole is connected with the half-ball recessed part 8; based on this, when the position of the adjustment screw 5 deviates, for example, is not perpendicular to the concrete pad 7, the corresponding connecting rib 13 will be at a certain angle relative to the center line of the operation hole 9, and the operation hole 9 is arranged as a tapered hole according to the above structure, so as to facilitate the external tool such as the screwdriver to be inclined through the operation hole 9 and be connected with the cross opening 12.

[0044] In order to facilitate the operation of the cover plate 12 and fixed, further, in a preferred embodiment, please refer to Figure 8 , the operation of the cover plate 12 side with the operation of the mouth 11 side hinge, the other side of the operation of the cover plate 12 and the other side of the operation of the mouth 11 through the fastener connection.

[0045] Further, in a preferred embodiment, please refer to Figure 8 , the operation of the mouth 11 and the interface edge of the operation of the cover plate 12 are arranged to each other to tilt the fit, so that the operation of the cover plate 12 and the operation of the mouth 11 when the two fit seal, thereby preventing the operation of the mouth when pouring concrete leakage; preferably, the interface edge of the operation of the mouth 11 and the interface edge of the operation of the cover plate 12 are arranged to tilt 45° from outside to inside.

[0046] Further, in a preferred embodiment, the protective layer control assembly 3 is uniformly arranged in the annular space between the steel formwork 2 and the reinforcement cage 1, and the protective layer control assembly 3 is arranged 3-4 in the annular direction according to the number of the outermost main reinforcement, and the protective layer control assembly 3 is arranged 1 in the longitudinal direction every 1-2 m.

[0047] Further, in a preferred embodiment, please refer to Figure 2 and Figure 8 , the operation of the mouth 11 is a rectangular opening, the concrete block 7 is a rectangular structure, the size of the surface of the concrete block 7 abutting with the operation of the mouth 11 is slightly smaller than the size of the operation of the mouth 11, so as to facilitate the concrete block 7 through the operation of the mouth 11 into the steel formwork, usually control operation of the mouth 11, the length and width of the concrete block 7 and the abutting surface of the operation of the mouth 11 are all greater than 0.3-0.5 cm.

[0048] Further, in a preferred embodiment, please refer to Figure 3 , the embedding abutting surface of the hemispherical recess 8 and the hemispherical protrusion 6 is coated with an adhesive layer 15, wherein the adhesive layer 15 is formed by coating the building glue, and in the specific operation, the building glue can be coated on the surface of the hemispherical recess 8 or the surface of the hemispherical protrusion 6, and the adhesive layer 15 can be formed after the building glue solidifies when the hemispherical recess 8 and the hemispherical protrusion 6 are embedded. The connection strength of the hemispherical recess 8 and the hemispherical protrusion 6 can be enhanced by the adhesion of the adhesive layer 15, and the hemispherical recess 8 and the hemispherical protrusion 6 can be sealed, so as to avoid the connection seam between the hemispherical recess 8 and the hemispherical protrusion 6 from forming a water seepage channel and causing a primary cell reaction.

[0049] Further, in a preferred embodiment, the radius of the hemispherical recess 8 is 0.4-0.5 times the thickness of the concrete block 7. Example 2

[0050] The embodiment provides a construction method of a bridge pier column construction structure facilitating control of the thickness of a protective layer, and refers to Figure 7 which comprises the following steps:

[0051] S1, the protective layer control assembly 3 is designed and processed according to the thickness of the reinforcing steel bar protective layer, wherein the radius of the hemispherical recess 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, so as to ensure the embedding connection strength of the hemispherical recess 8 and the hemispherical protruding part 6;

[0052] S2, the reinforcing cage 1 is bound and installed on the bearing platform according to a conventional method;

[0053] S3, according to the position of the main reinforcing steel bar of the reinforcing cage 1, the designed and laid position of the protective layer control assembly 3 and the size of the concrete cushion block, the operation opening 11 is pre-formed on the steel formwork 2 and the operation cover plate 12 is installed, then the steel formwork 2 is installed on the side of the reinforcing cage 1, so as to form a construction space for pouring the bridge pier column and reserve the position of the reinforcing steel bar protective layer, and the operation opening 11 on the steel formwork 2 corresponds to the designed and laid position of the protective layer control assembly 3 one by one;

[0054] S4, after the reinforcing cage 1 and the steel formwork 2 are installed, the operation cover plate 12 is opened, the fixing nut 4 is welded on the main reinforcing steel bar at the corresponding position through the operation opening 11, then the adjusting screw 5 is screwed into the nut 4 to preliminarily fix the hemispherical protruding part 6, and the hemispherical protruding part 6 and the operation opening 11 are left with a suitable installation space of the concrete cushion block 7; then the surface of the hemispherical recess 8 of the concrete cushion block 7 is coated with building glue, the concrete cushion block 7 is horizontally inserted into the operation opening 11 and rotated by 90 degrees according to the size of the operation opening 11, and the operation hole 9 is aligned with the cross opening 14, then the screwdriver 16 is sequentially inserted through the operation hole 9 and the hemispherical recess 8 to embed the end of the screwdriver 16 into the cross opening 14, the adjusting screw 5 is slowly unscrewed through the cross opening 14, so that the adjusting screw 5 drives the hemispherical protruding part 6 to move towards the hemispherical recess 8 of the concrete cushion block 7, until the hemispherical recess 8 on one side of the concrete cushion block 7 is embedded and abuts against the hemispherical protruding part 6, and the upper and lower ends on the other side of the concrete cushion block 7 abut against the upper and lower ends of the operation opening 11 respectively, so as to transmit the supporting force to the steel formwork, at this time, the installation of the protective layer control assembly 3 is completed; according to the step, the protective layer control assemblies 3 at different positions are installed through the operation openings 11 from bottom to top and in turn along the ring direction;

[0055] S5, the operation hole 9 of the protective layer control assembly 3 is filled with cement mortar 10, and then the operation cover plate 12 is covered;

[0056] S6, the concrete pouring construction is performed according to a conventional method.

Claims

1. A bridge pier construction structure facilitating control of the thickness of a reinforcement cover, comprising a reinforcement cage (1), and a steel formwork (2) which is arranged around the steel reinforcement cage (1) to form a bridge pier construction space, characterized in that, Also include: The protective layer control assembly (3) is arranged between the steel formwork (2) and the steel cage (1); the steel formwork (2) is provided with an operation opening (11) at the position where the protective layer control assembly (3) is arranged, and a freely openable operation cover plate (12) is hinged to the operation opening (11); the protective layer control assembly (3) comprises a fixing nut (4) welded to the main reinforcement of the steel cage (1), an adjusting screw (5) threadedly connected with the fixing nut (4), a hemispherical protruding portion (6) coaxially arranged at the other end of the adjusting screw (5) relative to the fixing nut (4), a cross opening (14) coaxially arranged at the protruding side of the hemispherical protruding portion (6), and a concrete pad (7); the concrete pad (7) is provided with a hemispherical recess (8) and an operation hole (9) in sequence and in communication with each other at the middle position along the thickness direction of the concrete pad (7), and the operation hole (9) is filled with cement mortar (10); the hemispherical recess (8) on one side of the concrete pad (7) is embedded and abutted with the hemispherical protruding portion (6), and the upper and lower ends of the hemispherical recess (8) on the other side of the concrete pad (7) are respectively abutted with the upper and lower ends of the operation opening (11), so that the protective layer control assembly (3) is supported between the steel cage (1) and the steel formwork (2) to control the thickness of the steel reinforcement protective layer during the construction of the bridge pier column.

2. The bridge pier construction structure for facilitating control of the thickness of a reinforcing cover layer according to claim 1, characterized in that, The protective layer control assembly (3) further comprises a connecting rib (13) coaxially arranged at the protruding side of the hemispherical protruding portion (6) relative to the adjusting screw (5), and the connecting rib (13) extends into the operation hole (9), and the cross opening (14) is arranged at the outer end of the connecting rib (13).

3. The bridge pier construction structure for facilitating control of the thickness of the reinforcing cover according to claim 2, wherein The operation hole (9) is a tapered hole, the larger hole is connected with the operation opening (11), and the smaller hole is connected with the hemispherical recess (8).

4. The bridge pier construction structure for facilitating control of the thickness of a reinforcing cover layer according to 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) by a fastener.

5. The bridge pier construction structure for facilitating control of the thickness of a reinforcing cover layer according to claim 1, characterized in that The interface edges of the operation opening (11) and the operation cover plate (12) are arranged in mutual inclined abutment, so that when the operation cover plate (12) is covered on the operation opening (11), the two are abutted and sealed, thereby preventing the leakage of concrete during pouring.

6. The bridge pier construction structure for facilitating control of the thickness of a reinforcing cover layer according to claim 1, characterized in that, The protective layer control assembly (3) is uniformly arranged in the annular space between the steel formwork (2) and the steel cage (1), and 3-4 protective layer control assemblies (3) are arranged according to the number of the outermost main reinforcement in the circumferential direction, and one protective layer control assembly (3) is arranged every 1-2m in the longitudinal direction.

7. The bridge pier construction structure for facilitating control of the thickness of a reinforcing cover layer according to claim 1, characterized in that The operation opening (11) is a rectangular opening, the concrete pad (7) is a cuboid structure, and the size of the side of the concrete pad (7) abutting with the operation opening (11) is slightly smaller than the size of the operation opening (11).

8. The bridge pier construction structure for facilitating control of the thickness of a reinforcing cover layer according to claim 1, characterized in that, The embedded abutment surface of the hemispherical recess (8) and the hemispherical protruding portion (6) is coated with an adhesive layer (15).

9. The bridge pier construction structure for facilitating control of the thickness of a reinforcing cover layer according to claim 1, characterized in that, The radius of the hemispherical recess (8) is 0.4-0.5 times the thickness of the concrete pad (7).

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