External internal expansion type steel bar protection layer control device and implementation method thereof

Abstract

The invention discloses an external and internal expanding type steel bar protection layer control device and an implementation method thereof. The device comprises a front end limiting mechanism, an internal push rod mechanism, an external sleeve mechanism and a fixing mechanism. The front-end limiting mechanism achieves accurate limiting and buffering protection on the reinforcing steel bars through an elastic gasket and a limiting plate. The internal push rod mechanism controls the expansion and contraction of the limiting mechanism through push-pull actions; the external sleeve mechanism provides guidance and support for the push rod mechanism; the fixing mechanism firmly fixes the device on a steel mold through a magnetic attraction block and a thread adjusting structure, and the position can be adjusted to meet the thickness requirements of different protective layers. The implementation method comprises the steps of splicing, mounting and dismounting of the device, operation is easy and convenient, and the construction efficiency is high. The device has the advantages of being accurate in positioning, convenient to construct, reusable and the like, the problems that a traditional steel bar protection layer control device is prone to deviation, complex in construction, not reusable and the like are solved, the safety and durability of a reinforced concrete structure are improved, and the construction cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of reinforced concrete construction, and in particular to an externally mounted internally extended steel bar protective layer control device and an implementation method thereof. Background Art

[0002] Reinforced concrete structure is the most commonly used structural form in the fields of construction engineering, bridge engineering and tunnel engineering, and the thickness of the concrete cover outside the steel bar is one of the important evaluation criteria for the quality of reinforced concrete structure engineering. The main functions of the concrete cover include:

[0003] Anti-corrosion protection: avoid direct contact between steel bars and air, moisture, etc., slow down oxidation reaction and corrosion process, and prevent volume expansion caused by steel bar corrosion and the resulting cracking or spalling of concrete;

[0004] Structural performance guarantee: ensure effective bonding and coordinated force between steel bars and concrete, and improve the overall bearing capacity and seismic performance of the structure;

[0005] Fire prevention and physical protection: Improve the fire resistance of the structure and provide physical protection to ensure the normal performance and long-term service performance of reinforced concrete structures.

[0006] However, the commonly used steel bar protection layer control methods in reinforced concrete structure construction currently mainly rely on prefabricated concrete pads or built-in fixed steel bar protection layer control devices. These methods have the following problems in practical applications:

[0007] Insufficient positioning accuracy: Precast concrete pads are usually placed directly under the steel bars, while built-in fixed devices are installed above the steel bars. Due to the impact force and fluidity during concrete pouring and vibration, these devices are prone to displacement or fall off, making it difficult to accurately control the thickness of the steel bar protective layer;

[0008] Complex construction process: Built-in fixed devices need to be installed after the steel bars are tied, which limits the operating space, reduces construction efficiency, and is difficult to adjust after concrete pouring;

[0009] Non-reusable: Traditional devices are mostly one-time use and cannot be removed after concrete pouring, resulting in a waste of resources and increased construction costs;

[0010] Position uncertainty: After concrete pouring, the position of traditional devices in the structure is uncertain, making it difficult to ensure the uniformity and consistency of the thickness of the steel bar cover.

[0011] In response to the above problems, there is an urgent need for a steel bar protective layer control device that can achieve precise positioning, convenient construction, reusability and not easy to dislocate and fall off, so as to improve the safety and durability of reinforced concrete structures and reduce the cost of the entire life cycle. Summary of the invention

[0012] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0013] Therefore, in order to solve the above technical problems, the present invention provides the following technical solutions: an external inner expansion type steel bar protective layer control device, comprising:

[0014] The front-end limiting mechanism is arranged at the front end of the device and is used to limit and fix the steel bars;

[0015] An internal push rod mechanism, including an internal push rod and an external push rod, is used to control the expansion and contraction of the front-end limit mechanism through a push-pull action;

[0016] An external sleeve mechanism, including an internal sleeve and an external sleeve, is used to accommodate the internal push rod mechanism and provide internal guidance and external support for it;

[0017] The fixing mechanism includes a fixing frame, which is used to fix the device on the steel formwork and adjust the position of the device to meet the steel bar cover control requirements.

[0018] As a preferred solution of the externally mounted inwardly extended steel bar protective layer control device of the present invention, the front end limiting mechanism includes:

[0019] Two connecting plates, each connecting plate having connecting holes at both ends;

[0020] Two limit plates, each of which has connecting holes in the middle and at one end;

[0021] Two elastic gaskets are arranged at the connection between the upper and lower limit plates, and a connecting hole is opened in the middle of the elastic gasket;

[0022] Two connecting limit plate anchor bolts, used to connect the connecting plate and the limit plate;

[0023] A limit plate anchor bolt, used to connect the limit plate and the elastic gasket;

[0024] A connecting plate anchor bolt is used to connect the upper and lower connecting plates.

[0025] As a preferred solution of the external and internally extended steel bar protective layer control device described in the present invention, the limiting plate is limited at the center of the built-in sleeve by the cooperation of the limiting plate anchor bolt and the elastic gasket, so that the front end limiting mechanism is connected to the external sleeve mechanism; the elastic gasket is used to provide buffering when the limiting plate contacts the steel bar to prevent damage to the steel bar surface.

[0026] As a preferred solution of the external and internally extended steel bar protective layer control device described in the present invention, the connecting plate is movably connected to the built-in push rod through a connecting plate anchor bolt, so that the front end limiting mechanism is connected to the internal push rod mechanism.

[0027] As a preferred solution of the externally mounted internally extended steel bar protective layer control device of the present invention, the internal push rod mechanism includes:

[0028] A built-in push rod, the front end of which is provided with a sheet-shaped connector used in conjunction with the connecting plate anchor bolt, and the rear end of which is provided with a push rod threaded sleeve;

[0029] The front end of the external push rod is provided with a push rod threaded connector which is adapted to the push rod threaded sleeve structure, and the push rod threaded connector is threadedly connected to the push rod threaded sleeve.

[0030] As a preferred solution of the external inner-expanding steel bar protective layer control device of the present invention, the external sleeve mechanism includes:

[0031] The built-in sleeve has a front opening at its front end for the front end limit mechanism to expand and contract, and a sleeve thread sleeve is arranged at its rear end;

[0032] The external sleeve has a sleeve threaded connector for use with the sleeve threaded sleeve arranged at its front end, and the sleeve threaded connector is threadedly connected with the sleeve threaded sleeve.

[0033] As a preferred solution of the external and internally extended steel bar protective layer control device described in the present invention, wherein: an external thread structure is arranged on the circumferential outer wall of the external sleeve, a middle nut used in conjunction with the external thread structure is arranged in the middle of the fixed frame, and the external sleeve is threadedly connected to the middle nut through the external thread structure, so that the relative position of the fixed frame and the external sleeve mechanism can be adjusted by adjusting the position of the middle nut on the external sleeve to meet the steel bar protective layer control requirements.

[0034] As a preferred solution of the external and internally extended steel bar protective layer control device described in the present invention, wherein: a push rod anchoring disc is arranged at the rear end of the external push rod, a sleeve anchoring disc is arranged at the rear end of the external sleeve, the push rod anchoring disc is arranged on the rear side of the sleeve anchoring disc, and arc-shaped anchoring holes corresponding to the positions are arranged on the two groups of anchoring discs, and the front and rear groups of anchoring discs are fixed by arranging ties in the arc-shaped anchoring holes to ensure that the device remains stable during the concrete pouring process.

[0035] As a preferred solution of the externally mounted internally extended steel bar protective layer control device and its implementation method of the present invention, wherein: the fixing mechanism includes:

[0036] A fixing frame, wherein a nut is provided in the middle, fixing bolts are arranged around the nut, and a magnetic block is arranged at the end of the fixing bolt;

[0037] The magnetic block is used to firmly adsorb the device on the steel mold to ensure that the device does not move during the concrete pouring process.

[0038] The present invention also provides an implementation method of the above-mentioned externally mounted internally extended steel bar protective layer control device, which is characterized by comprising:

[0039] S1: Device assembly steps: assemble the internal push rod and the external push rod into an internal push rod mechanism; assemble the internal sleeve and the external sleeve into an external sleeve mechanism; install the fixing frame on the external thread of the external sleeve; insert the internal push rod mechanism into the external sleeve mechanism; connect and fix the front end limit mechanism with the internal push rod mechanism and the external sleeve mechanism respectively, and complete the assembly of the device;

[0040] S2: Device installation steps: insert the device into the reserved hole of the steel mold from the outside; adjust the relative position of the fixing frame and the external sleeve mechanism to meet the steel bar protection layer control requirements; magnetically absorb the fixing frame on the steel mold; push the internal push rod mechanism to expand the front end limit mechanism so that the steel bar and the limit plate are against each other; fix the arc-shaped anchor holes of the two sets of anchor discs on the external push rod and the external sleeve with wire to complete the installation of the device;

[0041] S3: Device dismantling steps: After the concrete reaches a certain strength, remove the external push rod, external sleeve and fixing frame to complete the dismantling of the device.

[0042] As a preferred embodiment of the implementation method of the external inner expansion type steel bar protective layer control device of the present invention, wherein: each steel bar protective layer control device needs to use a set of front-end limiting mechanisms, a set of internal push rods, a set of external push rods, a set of internal sleeves, a set of external sleeves and a set of fixing frames during the assembly and use process;

[0043] The external push rod, the external sleeve and the fixing frame are reusable.

[0044] Beneficial effects of the present invention:

[0045] 1. In terms of precise positioning and stability, the present invention realizes accurate positioning of the steel bars through the precise cooperation between the front-end limiting mechanism and the internal push rod mechanism. At the same time, the fixing mechanism uses a magnetic block to firmly adsorb on the steel mold, and allows the relative position of the fixing frame to be adjusted through the external thread of the external sleeve, so as to meet the control requirements of different steel bar protective layer thicknesses; this design ensures that the device is not easily displaced or falls off after positioning, and can maintain stability even during concrete pouring and vibration processes; through precise adjustment, the thickness of the steel bar protective layer can be evenly and consistently controlled.

[0046] 2. In terms of convenient construction and efficient operation, this device is assembled, installed and dismantled on the outside of the steel formwork, without relying on the steel bars inside the structure, thus providing a larger operating space and a simpler process. This greatly simplifies the construction process, improves efficiency, and avoids the construction difficulties caused by the limited operating space of traditional built-in fixed devices.

[0047] 3. The present invention embodies the concepts of reusability and cost saving. Specifically, key components such as the external push rod, the external sleeve and the fixing frame can be disassembled and reused; this not only reduces resource waste and construction costs, but also enables the disassembled components to be applied to other engineering projects, further improving resource utilization.

[0048] 4. Traditional technologies mostly use disposable prefabricated concrete pads or built-in fixed devices, which have problems such as inaccurate positioning, complex construction, and non-reusability. The present invention successfully solves the above problems through an external internal expansion design, combined with the synergy of the front-end limit mechanism, internal push rod mechanism, external sleeve mechanism and fixing mechanism; in particular, the elastic gasket design in the front-end limit mechanism can provide buffering when the limit plate contacts the steel bar to prevent damage to the steel bar surface; the magnetic block design in the fixing mechanism ensures the stability of the device during concrete pouring; and the anchor disc design of the external push rod and the external sleeve is fixed through arc-shaped anchor holes and wire ties, further enhancing the stability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

[0050] Figure 1 It is a schematic diagram of the overall structure of the device of the present invention after assembly.

[0051] Figure 2 It is a schematic diagram of the overall structure of the device of the present invention after installation.

[0052] Figure 3 It is a schematic diagram of the exploded structure of the components of the front-end limiting mechanism and the internal push rod mechanism of the present invention.

[0053] Figure 4 It is a schematic diagram of the specific structure of the external sleeve mechanism of the present invention.

[0054] Figure 5 It is a schematic diagram of the specific structure of the fixing mechanism of the present invention.

[0055] In the figure: 100, front end limit mechanism; 101, connecting plate; 102, limit plate; 103, elastic gasket; 104, connecting limit plate anchor bolt; 105, limit plate anchor bolt; 106, connecting plate anchor bolt;

[0056] 200, internal push rod mechanism; 201, internal push rod; 201a, sheet-shaped connector; 201b, push rod threaded sleeve; 202, external push rod; 202a, push rod threaded connector; 202b, push rod anchoring disc;

[0057] 300, external sleeve mechanism; 301, internal sleeve; 301a, front end opening; 301b, sleeve threaded sleeve; 302, external sleeve; 302a, sleeve threaded connector; 302b, sleeve anchoring disc;

[0058] 400, fixing mechanism; 401, fixing frame; 401a, middle nut; 401b, fixing bolt; 401c, magnetic block. DETAILED DESCRIPTION

[0059] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0060] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0061] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0062] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0063] Reference Figures 1 to 5 , as an embodiment of the present invention, provides an externally mounted internally extended steel bar protective layer control device, comprising the following main components:

[0064] The front-end limiting mechanism 100 is arranged at the front end of the device and is used to limit and fix the steel bars; its specific structure includes:

[0065] Connecting plates 101: Both ends of the two connecting plates 101 are provided with connecting holes for connecting with the limiting plates 102 and the built-in push rods 201;

[0066] Limiting plates 102: The middle and one end of the two limiting plates 102 are respectively provided with connecting holes for connecting with the connecting plate 101 and the elastic gasket 103;

[0067] Elastic gasket 103: Two elastic gaskets 103 are arranged at the connection between the upper and lower limit plates 102. A connection hole adapted to the structure of the limit plate anchor bolt 105 is opened in the middle of the elastic gasket 103; the elastic gasket 103 is used to provide buffering when the limit plate 102 contacts the steel bar to prevent the surface of the steel bar from being damaged;

[0068] Connecting limit plate anchor bolts 104: Two connecting limit plate anchor bolts 104 are used to connect the connecting plate 101 and the limit plate 102;

[0069] Limiting plate anchor bolt 105: A limiting plate anchor bolt 105 is used to connect the limiting plate 102 and the elastic gasket 103, so that the limiting plate 102 is limited in the center of the built-in sleeve 301 through the cooperation of the limiting plate anchor bolt 105 and the elastic gasket 103, thereby realizing the connection between the front-end limiting mechanism 100 and the external sleeve mechanism 300;

[0070] Connecting plate anchor bolt 106: A connecting plate anchor bolt 106 is used to connect the upper and lower connecting plates 101, and is movably connected to the built-in push rod 201 through the connecting plate anchor bolt 106 to achieve the connection between the front end limit mechanism 100 and the internal push rod mechanism 200.

[0071] The internal push rod mechanism 200 is used to control the expansion and contraction of the front-end limit mechanism 100 through push-pull actions, and its specific structure includes:

[0072] Built-in push rod 201: The front end of the built-in push rod 201 is provided with a sheet-shaped connector 201a used in conjunction with the connecting plate anchor bolt 106, and the rear end of the built-in push rod 201 is provided with a push rod threaded sleeve 201b;

[0073] External push rod 202: The front end of the external push rod 202 is provided with a push rod threaded connector 202a adapted to the push rod threaded sleeve 201b structure, and the push rod threaded connector 202a is threadedly connected with the push rod threaded sleeve 201b to form an internal push rod mechanism 200;

[0074] Push rod anchoring disc 202b: A push rod anchoring disc 202b is arranged at the rear end of the external push rod 202 for cooperating and fixing with the sleeve anchoring disc 302b.

[0075] The external sleeve mechanism 300 is used to accommodate the internal push rod mechanism 200 and provide internal guidance and external support for it. Its specific structure includes:

[0076] Built-in sleeve 301: The front end of the built-in sleeve 301 is provided with a front opening 301a for the front end limiting mechanism 100 to expand and contract, and the rear end of the built-in sleeve 301 is provided with a sleeve threaded sleeve 301b;

[0077] External sleeve 302: The front end of the external sleeve 302 is provided with a sleeve threaded connector 302a used in conjunction with the sleeve threaded sleeve 301b. The sleeve threaded connector 302a is threadedly connected with the sleeve threaded sleeve 301b to form an external sleeve mechanism 300;

[0078] External thread structure 302c: An external thread structure 302c is arranged on the circumferential outer wall of the external sleeve 302, which is used for threaded connection with the middle nut 401a of the fixing frame 401;

[0079] Sleeve anchoring disc 302b: A sleeve anchoring disc 302b is arranged at the rear end of the external sleeve 302, which is used to cooperate with the push rod anchoring disc 202b for fixation; the push rod anchoring disc 202b is arranged on the rear side of the sleeve anchoring disc 302b, and the two groups of anchoring discs are arranged with arc-shaped anchoring holes with corresponding positions. The front and rear groups of anchoring discs are fixed by arranging ties in the arc-shaped anchoring holes to ensure that the device remains stable during the concrete pouring process.

[0080] The fixing mechanism 400 includes a fixing frame 401, which is used to fix the device on the steel mold and adjust the position of the device to meet the steel bar cover control requirements. The specific structure includes:

[0081] Fixed frame 401: A nut 401a is provided in the middle of the fixed frame 401, and fixing bolts 401b are arranged around the nut 401a, and a magnetic attraction block 401c is arranged at the end of the fixing bolt 401b;

[0082] Magnetic block 401c: Magnetic block 401c is used to firmly adsorb the device on the steel mold to ensure that the device does not move during the concrete pouring process;

[0083] Middle nut 401a: The middle nut 401a is threadedly connected to the external thread structure 302c of the external sleeve 302. By adjusting the position of the middle nut 401a on the external sleeve 302, the relative position of the fixing frame 401 and the external sleeve mechanism 300 can be adjusted to meet the control requirements of the steel bar protection layer.

[0084] This embodiment also provides an implementation method of the above-mentioned external inner-expanding steel bar protective layer control device, including the following specific steps:

[0085] 1. The steps for assembling the device are as follows:

[0086] The internal push rod 201 and the external push rod 202 are threadedly connected through the push rod threaded sleeve 201b and the push rod threaded connector 202a to form an internal push rod mechanism 200;

[0087] The internal sleeve 301 and the external sleeve 302 are threadedly connected through the sleeve threaded sleeve 301b and the sleeve threaded connector 302a to form an external sleeve mechanism 300;

[0088] Install the fixing frame 401 on the external thread 302c of the external sleeve 302;

[0089] Insert the internal push rod mechanism 200 into the external sleeve mechanism 300;

[0090] The front-end limiting mechanism 100 is connected and fixed to the internal push rod mechanism 200 and the external sleeve mechanism 300 respectively to complete the assembly of the device.

[0091] 2. The steps for installing the device are as follows:

[0092] Insert the device into the reserved hole of the steel mold from the outside;

[0093] Adjust the relative position of the fixing frame 401 and the external sleeve mechanism 300 to meet the steel bar protection layer control requirements;

[0094] The fixing frame 401 is firmly adsorbed on the steel mold through the magnetic block 401c;

[0095] Push the internal push rod mechanism 200 to expand the front end limit mechanism 100 so that the steel bar and the limit plate 102 abut against each other;

[0096] The external push rod 202 and the external sleeve 302 are fixed at the arc-shaped anchor holes 202b-1, 302b-1 of the rear end anchor discs 202b, 302b with wires to ensure that the device remains stable during the concrete pouring process, thereby completing the installation of the device.

[0097] 3. The steps for dismantling the device are as follows:

[0098] After the concrete reaches the required strength, the external push rod 202, the external sleeve 302 and the fixing frame 401 are removed to complete the dismantling of the device;

[0099] The external push rod 202, the external sleeve 302 and the fixing frame 401 can be reused, thereby reducing waste of resources and lowering construction costs.

[0100] Furthermore, each steel bar protective layer control device needs to be assembled and used in the process of using a set of front-end limiting mechanisms 100, a set of internal push rods 201, a set of external push rods 202, a set of internal sleeves 301, a set of external sleeves 302 and a set of fixing frames 401. Among them, the external push rods 202, the external sleeves 302 and the fixing frames 401 can be reused, which significantly improves resource utilization and reduces construction costs.

[0101] This embodiment describes in detail the structure, assembly, installation and removal methods of the above-mentioned external and internally extended steel bar protective layer control device. Through the coordinated action of the front-end limiting mechanism 100, the internal push rod mechanism 200, the external sleeve mechanism 300 and the fixing mechanism 400, the precise positioning, convenient construction and reusability of the device are achieved; the device can effectively solve the problems of traditional steel bar protective layer control devices in practical applications and improve the safety and durability of reinforced concrete structures.

[0102] Importantly, it should be noted that the construction and arrangement of the present application shown in a plurality of different exemplary embodiments are only exemplary. Although only a few embodiments are described in detail in this disclosure, it should be readily understood by those who refer to this disclosure that many modifications are possible (e.g., the size, scale, structure, shape and proportion of various elements, and parameter values ​​(e.g., temperature, pressure, etc.), installation arrangement, use of materials, color, directional changes, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in the application. For example, the element shown as integrally formed can be composed of multiple parts or elements, the position of the element can be inverted or otherwise changed, and the nature or number or position of the discrete element can be changed or changed. Therefore, all such modifications are intended to be included in the scope of the present invention. The order or sequence of any process or method steps can be changed or reordered according to alternative embodiments. In the claims, any "device plus function" clause is intended to cover the structure of performing the function described herein, and is not only structurally equivalent but also equivalent structure. Without departing from the scope of the present invention, other replacements, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the exemplary embodiments. Therefore, the invention is not limited to a specific embodiment, but extends to numerous modifications still falling within the scope of the appended claims.

[0103] Additionally, in order to provide a concise description of exemplary embodiments, all features of an actual embodiment (ie, those features that are not relevant to the best mode presently contemplated for carrying out the invention or those that are not relevant to implementing the invention) may not be described.

[0104] It will be appreciated that in the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort may be complex and time-consuming, but will be a routine task of design, fabrication, and production for those of ordinary skill having the benefit of this disclosure without undue experimentation.

[0105] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. An external and internally extended steel bar protective layer control device, characterized in that: include, A front-end limiting mechanism (100) is arranged at the front end of the device and is used to limit and fix the steel bars; An internal push rod mechanism (200), comprising an internal push rod (201) and an external push rod (202), is used to control the expansion and contraction of the front-end limiting mechanism (100) through a push-pull action; An external sleeve mechanism (300), comprising an internal sleeve (301) and an external sleeve (302), is used to accommodate the internal push rod mechanism (200) and provide internal guidance and external support for it; The fixing mechanism (400) comprises a fixing frame (401) for fixing the device on the steel mold and adjusting the position of the device to meet the control requirements of the steel bar protective layer.

2. The externally mounted internally extended steel bar protective layer control device according to claim 1, characterized in that: The front end limiting mechanism (100) comprises: Two connecting plates (101), each connecting plate (101) having connecting holes at both ends; Two limiting plates (102), each limiting plate (102) having a connecting hole in the middle and at one end thereof; Two elastic gaskets (103) are arranged at the connection between the upper and lower limiting plates (102), and a connecting hole is opened in the middle of the elastic gasket (103); Two connecting limit plate anchor bolts (104) for connecting the connecting plate (101) and the limit plate (102); A limit plate anchor bolt (105) for connecting the limit plate (102) and the elastic gasket (103); A connecting plate anchor bolt (106) is used to connect the upper and lower connecting plates (101).

3. The external and internally extended steel bar protective layer control device according to claim 2, characterized in that: The limiting plate (102) is limited at the center of the built-in sleeve (301) by the cooperation of the limiting plate anchor bolt (105) and the elastic gasket (103), so that the front-end limiting mechanism (100) is connected to the external sleeve mechanism (300); the elastic gasket (103) is used to provide a buffer when the limiting plate (102) contacts the steel bar, thereby preventing the surface of the steel bar from being damaged.

4. The externally mounted inner-expanded steel bar protective layer control device according to claim 3, characterized in that: The connecting plate (101) is movably connected to the built-in push rod (201) via a connecting plate anchor bolt (106), so that the front end limit mechanism (100) is connected to the internal push rod mechanism (200).

5. The externally mounted internally extended steel bar protective layer control device according to claim 4, characterized in that: The internal push rod mechanism (200) comprises: A built-in push rod (201), the front end of which is provided with a sheet-shaped connector (201a) used in conjunction with a connecting plate anchor bolt (106), and the rear end of which is provided with a push rod threaded sleeve (201b); The external push rod (202) has a push rod threaded connector (202a) at its front end that is structurally compatible with the push rod threaded sleeve (201b), and the push rod threaded connector (202a) is threadedly connected to the push rod threaded sleeve (201b).

6. The externally mounted inner-expanded steel bar protective layer control device according to claim 5, characterized in that: The external sleeve mechanism (300) comprises: The built-in sleeve (301) has a front opening (301a) at its front end for the front limiting mechanism (100) to expand and contract, and a sleeve thread sleeve (301b) at its rear end; The external sleeve (302) has a sleeve threaded connector (302a) disposed at its front end for use with the sleeve threaded sleeve (301b), and the sleeve threaded connector (302a) is threadedly connected to the sleeve threaded sleeve (301b).

7. The externally mounted inner-expanded steel bar protective layer control device according to claim 6, characterized in that: An external thread structure is arranged on the circumferential outer wall of the external sleeve (302), and a middle nut (401a) used in conjunction with the external thread structure is arranged in the middle of the fixing frame (401). The external sleeve (302) is threadedly connected to the middle nut (401a) via the external thread structure, so that the relative position of the fixing frame (401) and the external sleeve mechanism (300) can be adjusted by adjusting the position of the middle nut (401a) on the external sleeve (302) to meet the control requirements of the steel bar protective layer.

8. The externally mounted internally extended steel bar protective layer control device according to claim 7, characterized in that: A push rod anchoring disc (202b) is arranged at the rear end of the external push rod (202), and a sleeve anchoring disc (302b) is arranged at the rear end of the external sleeve (302). The push rod anchoring disc (202b) is arranged on the rear side of the sleeve anchoring disc (302b). Both groups of anchoring discs are arranged with arc-shaped anchoring holes of corresponding positions. The front and rear groups of anchoring discs are fixed by arranging wires in the arc-shaped anchoring holes to ensure that the device remains stable during the concrete pouring process.

9. The externally mounted inner-expanded steel bar protective layer control device according to claim 8, characterized in that: The fixing mechanism (400) comprises: A fixing frame (401) is provided with a nut (401a) at its center, fixing bolts (401b) are arranged around the nut (401a), and a magnetic attraction block (401c) is arranged at the end of the fixing bolt (401b); The magnetic block (401c) is used to firmly adsorb the device on the steel mold to ensure that the device does not move during the concrete pouring process.

10. The implementation method of the externally mounted internally extended steel bar protective layer control device according to claim 9, characterized in that: include, S1: Device assembly steps: assembling the internal push rod (201) and the external push rod (202) into an internal push rod mechanism (200); assembling the internal sleeve (301) and the external sleeve (302) into an external sleeve mechanism (300); installing the fixing frame (401) on the external thread (302c) of the external sleeve (302); inserting the internal push rod mechanism (200) into the external sleeve mechanism (300); connecting and fixing the front end limit mechanism (100) to the internal push rod mechanism (200) and the external sleeve mechanism (300) respectively, and completing the assembly of the device; S2: Device installation steps: insert the device into the reserved hole of the steel mold from the outside; adjust the relative position of the fixing frame (401) and the external sleeve mechanism (300) to meet the steel bar protection layer control requirements; magnetically attract the fixing frame (401) to the steel mold; push the internal push rod mechanism (200) to expand the front end limit mechanism (100) so that the steel bar and the limit plate (102) are against each other; fix the arc-shaped anchor holes of the two groups of anchor discs on the external push rod (202) and the external sleeve (302) with wire to complete the installation of the device; S3: Device dismantling step: After the concrete reaches a certain strength, the external push rod (202), the external sleeve (302) and the fixing frame (401) are removed for easy reuse, and the device is dismantled.

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