External inner expansion type reinforcing bar protective layer control device and implementation method thereof

Abstract

The application discloses an external inner expansion type reinforcing steel bar protective 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 realizes accurate limiting and buffer protection of the reinforcing steel bar through an elastic gasket and a limiting plate. The internal push rod mechanism controls the expansion and contraction of the limiting mechanism through a push-pull action. 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 magnetic attraction blocks and a threaded adjusting structure, and can adjust the position to meet different protective layer thickness requirements. The implementation method comprises the steps of assembling, installing and removing the device, and is simple to operate and high in construction efficiency. The application has the advantages of accurate positioning, convenient construction and reusability, solves the problems of easy deviation of the traditional reinforcing steel bar protective layer control device, complex construction and non-reusability, improves the safety and durability of the reinforced concrete structure, and reduces the construction cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of reinforced concrete construction, and particularly relates to an external and internal expansion type steel bar protective layer control device and an implementation method thereof. BACKGROUND

[0002] Reinforced concrete structure is the most commonly used structural form in the fields of building engineering, bridge engineering and tunnel engineering, and the thickness of the concrete protective layer on the outer side of the steel bar is one of the important evaluation standards for the quality of reinforced concrete structure engineering. The main functions of the concrete protective layer include:

[0003] Corrosion protection: avoiding direct contact of steel bars with air, moisture and other substances, slowing down the oxidation reaction and corrosion process, and preventing the volume expansion and the concrete cracking or peeling caused by steel bar corrosion;

[0004] Structural performance guarantee: ensuring effective bonding and collaborative force of steel bars and concrete, and improving the overall bearing capacity and seismic performance of the structure;

[0005] Fire protection and physical protection: improving the fire protection performance of the structure, and providing physical protection to ensure the normal use performance and long-term service performance of the reinforced concrete structure.

[0006] However, the current steel bar protective layer control method commonly used in reinforced concrete structure construction mainly relies on prefabricated concrete pads or built-in fixed steel bar protective layer control devices, and these methods have the following problems in actual application:

[0007] Insufficient positioning accuracy: prefabricated concrete pads are usually directly placed under the steel bars, and built-in fixed devices are erected above the steel bars. Due to the impact force and fluidity in the concrete pouring and vibrating process, these devices are prone to deviation or falling 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 bar binding is completed, the operation space is limited, the construction efficiency is low, and it is difficult to adjust after the concrete is poured;

[0009] Non-reusable: traditional devices are mostly one-time use and cannot be removed after concrete pouring, causing resource waste and increasing construction cost;

[0010] Position uncertainty: after the concrete is poured, the position of the traditional device in the structure is uncertain, making it difficult to ensure the uniformity and consistency of the thickness of the steel bar protective layer.

[0011] In view of the above problems, there is an urgent need for a steel bar protective layer control device that can realize accurate positioning, convenient construction, reusability and is not prone to deviation and falling off, so as to improve the safety and durability of the reinforced concrete structure and reduce the life cycle cost. SUMMARY

[0012] This section is intended to summarize some aspects of the embodiments of the present application and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section as well as in the abstract of the specification and the title of the application in order to avoid obscuring the purpose of the section, the abstract of the specification and the title of the application as such simplifications or omissions are not intended to limit the scope of the present application.

[0013] Therefore, in order to solve the above technical problems, the present application provides the following technical solutions: An external inner expansion type reinforcement protective layer control device, comprising:

[0014] A front end limiting mechanism arranged at the front end of the device, used for limiting and fixing the reinforcement;

[0015] An internal push rod mechanism comprising an internal push rod and an external push rod, used for controlling the expansion and contraction of the front end limiting mechanism through a push-pull action;

[0016] An external sleeve mechanism comprising an internal sleeve and an external sleeve, used for accommodating the internal push rod mechanism and providing internal guidance and external support for the internal push rod mechanism;

[0017] A fixing mechanism comprising a fixing frame, used for fixing the device on a steel mold and adjusting the position of the device to meet the reinforcement protective layer control requirements.

[0018] As a preferred scheme of the external inner expansion type reinforcement protective layer control device of the present application, wherein: the front end limiting mechanism comprises:

[0019] Two connecting plates, each of which has connecting holes at both ends;

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

[0021] Two elastic washers arranged at the connection of the upper and lower limiting plates, the middle of the elastic washer having a connecting hole;

[0022] Two connecting limiting plate anchor bolts used for connecting the connecting plates and the limiting plates;

[0023] One limiting plate anchor bolt used for connecting the limiting plates and the elastic washers;

[0024] One connecting plate anchor bolt used for connecting the upper and lower connecting plates.

[0025] As a preferred scheme of the external inner expansion type reinforcement protective layer control device of the present application, wherein: the limiting plate is limited in the center of the internal sleeve through the cooperation of the limiting plate anchor bolt and the elastic washer, so that the front end limiting mechanism is connected with the external sleeve mechanism; the elastic washer is used to provide cushioning when the limiting plate contacts the reinforcement, preventing damage to the surface of the reinforcement.

[0026] As a preferred scheme of the external inner expansion type reinforcement cover control device, the connecting plate is movably connected with the internal push rod through the connecting plate anchor bolt, so that the front end limiting mechanism is connected with the internal push rod mechanism.

[0027] As a preferred scheme of the external inner expansion type reinforcement cover control device, the internal push rod mechanism comprises,

[0028] The internal push rod is provided with a sheet-shaped connecting head at the front end for cooperation with the connecting plate anchor bolt, and is provided with a push rod threaded sleeve at the rear end.

[0029] The external push rod is provided with a push rod threaded connecting head at the front end for cooperation with the push rod threaded sleeve structure, and the push rod threaded connecting head is threadedly connected with the push rod threaded sleeve.

[0030] As a preferred scheme of the external inner expansion type reinforcement cover control device, the external sleeve mechanism comprises,

[0031] The internal sleeve is provided with a front end opening at the front end for expansion and contraction of the front end limiting mechanism, and is provided with a sleeve threaded sleeve at the rear end.

[0032] The external sleeve is provided with a sleeve threaded connecting head at the front end for cooperation with the sleeve threaded sleeve, and the sleeve threaded connecting head is threadedly connected with the sleeve threaded sleeve.

[0033] As a preferred scheme of the external inner expansion type reinforcement cover control device, the external sleeve is provided with an external thread structure on the circumferential outer wall, and the middle part of the fixing frame is provided with a middle nut for cooperation with the external thread structure, so that the external sleeve is threadedly connected with the middle nut through the external thread structure and the middle nut, and the relative position of the fixing frame and the external sleeve mechanism is adjusted by adjusting the position of the middle nut on the external sleeve to meet the reinforcement cover control requirements.

[0034] As a preferred scheme of the external inner expansion type reinforcement cover control device, the rear end of the external push rod is provided with a push rod anchor disc, the rear end of the external sleeve is provided with a sleeve anchor disc, the push rod anchor disc is arranged at the rear side of the sleeve anchor disc, and a corresponding arc-shaped anchor hole is arranged on each of the two groups of anchor discs, and the front and rear groups of anchor discs are fixed by arranging a wire in the arc-shaped anchor hole to ensure that the device remains stable during concrete pouring.

[0035] As a preferred scheme of the external inner expansion type reinforcement cover control device and the implementation method thereof, the fixing mechanism comprises,

[0036] The fixed frame is provided with a screw nut in the middle, the screw nut is provided with a fixing bolt around, and the end of the fixing bolt is provided with a magnetic block;

[0037] The magnetic block is used for firmly adsorbing the device on the steel mold, and ensures that the device does not displace in the concrete pouring process.

[0038] The application also provides an implementation method of the external inner expansion type reinforcement cover control device, and has the characteristics that,

[0039] S1: device assembly step: the internal push rod is combined and assembled with the external push rod to form an internal push rod mechanism; the internal sleeve is combined and assembled with the external sleeve to form an external sleeve mechanism; the fixed frame is installed on the external thread of the external sleeve; the internal push rod mechanism is sleeved into the external sleeve mechanism; the front end limiting mechanism is connected and fixed with the internal push rod mechanism and the external sleeve mechanism respectively, and the assembly of the device is completed.

[0040] S2: device installation step: the device is inserted into the steel mold reserved hole from the outside; the relative position of the fixed frame and the external sleeve mechanism is adjusted to meet the reinforcement cover control requirement; the fixed frame is magnetically adsorbed on the steel mold; the internal push rod mechanism is pushed to expand the front end limiting mechanism, so that the reinforcement is abutted with the limiting plate; the external push rod is fixed with the arc-shaped anchor hole of the two groups of anchor discs on the external sleeve by using a wire, and the installation of the device is completed.

[0041] S3: device removal step: after the concrete reaches the strength, the external push rod, the external sleeve and the fixed frame are removed, and the removal of the device is completed.

[0042] As a preferred scheme of the implementation method of the external inner expansion type reinforcement cover control device, each reinforcement cover control device is assembled and used with a group of front end limiting mechanisms, a group of internal push rods, a group of external push rods, a group of internal sleeves, a group of external sleeves and a group of fixed frames.

[0043] The external push rod, the external sleeve and the fixed frame can be repeatedly used.

[0044] The application has the following beneficial effects:

[0045] 1. In terms of accurate positioning and stability, the application realizes accurate limiting of the reinforcement through the precise cooperation of the front end limiting mechanism and the internal push rod mechanism. At the same time, the fixed mechanism is firmly adsorbed on the steel mold by using the magnetic block, and the relative position of the fixed frame is adjusted through the external thread of the external sleeve, so as to meet the control requirement of different reinforcement cover thicknesses; this design ensures that the device is not easy to deviate or fall off after positioning, and can maintain stability even in the concrete pouring and vibrating process; through accurate adjustment, the thickness of the reinforcement cover can be uniformly and consistently controlled.

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

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

[0048] 4. Traditional technology often uses disposable precast concrete pads or built-in fixed devices, which have problems such as inaccurate positioning, complex construction and non-reusable. The present application successfully solves the above problems through the design of external and internal display, combined with the synergistic effect of the front end limiting mechanism, internal push rod mechanism, external sleeve mechanism and fixing mechanism. In particular, the elastic gasket design in the front end limiting mechanism can provide cushioning when the limiting plate contacts the steel bar, preventing damage to the surface of the steel bar. The magnetic block design in the fixing mechanism ensures the stability of the device during the concrete pouring process. The anchor disc design of the external push rod and the external sleeve further enhances the stability of the device through the arc-shaped anchor hole and wire fixing. BRIEF DESCRIPTION OF DRAWINGS

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor. Among them:

[0050] Fig. 1 It is the overall structure schematic diagram of the device assembled by the present application.

[0051] Fig. 2 It is the overall structure schematic diagram of the device installed by the present application.

[0052] Fig. 3 It is the exploded structure schematic diagram of the front end limiting mechanism and the internal push rod mechanism of the present application.

[0053] Fig. 4 It is the specific structure schematic diagram of the external sleeve mechanism of the present application.

[0054] Fig. 5 It is the specific structure schematic diagram of the fixing mechanism of the present application.

[0055] In the figure: 100, front end limiting mechanism; 101, connecting plate; 102, limiting plate; 103, elastic gasket; 104, connecting limiting plate anchor bolt; 105, limiting 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 anchor 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 anchor 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 purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in conjunction with the drawings.

[0060] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein, and those skilled in the art can make similar generalizations without departing from the spirit of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0061] Secondly, "one embodiment" or "embodiment" referred to herein means that a specific feature, structure or characteristic can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in this specification does not mean the same embodiment, nor is it an embodiment that is separate or alternative to other embodiments.

[0062] Thirdly, the present application is described in detail in conjunction with the schematic diagram, and in the detailed description of the embodiments of the present application, the cross-sectional view of the device structure is partially enlarged without general proportion for the convenience of description, and the schematic diagram is only an example, which should not limit the scope of protection of the present application. In addition, three-dimensional spatial dimensions including length, width and depth should be included in actual manufacture.

[0063] Reference Figs. 1-5 For the embodiments of the present application, an external and external type steel reinforcement cover control device is provided, which comprises the following main components:

[0064] The front end limiting mechanism 100 is arranged at the front end of the device, and is used for limiting and fixing the steel bar; its specific structure includes:

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

[0066] Limiting plate 102: the middle part and one end of 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 connecting positions of the upper and lower limiting plates 102, and the middle part of the elastic gasket 103 is provided with a connecting hole matched with the structure of the limiting plate anchor bolt 105; the elastic gasket 103 is used to provide buffering when the limiting plate 102 contacts with the steel bar, so as to prevent the surface of the steel bar from being damaged;

[0068] Connecting limiting plate anchor bolt 104: two connecting limiting plate anchor bolts 104 are used to connect the connecting plate 101 and the limiting plate 102;

[0069] Limiting plate anchor bolt 105: one 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, and the connection between the front end limiting mechanism 100 and the external sleeve mechanism 300 is realized;

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

[0071] Internal push rod mechanism 200 is used to control the expansion and contraction of the front end limiting mechanism 100 through a pushing and pulling action, and the specific structure comprises:

[0072] Built-in push rod 201: the front end of the built-in push rod 201 is provided with a sheet-shaped connecting head 201a matched 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 connecting head 202a matched with the structure of the push rod threaded sleeve 201b, the push rod threaded connecting head 202a is threadedly connected with the push rod threaded sleeve 201b to form the internal push rod mechanism 200;

[0074] Push rod anchor disc 202b: the rear end of the external push rod 202 is provided with a push rod anchor disc 202b for cooperation and fixation with the sleeve anchor 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, and the specific structure comprises:

[0076] The built-in sleeve 301 has a front end opening 301a at the front end for the front end limiting mechanism 100 to expand and contract, and a sleeve threaded sleeve 301b arranged at the rear end of the built-in sleeve 301;

[0077] The external sleeve 302 has a sleeve threaded connector 302a arranged at the front end for cooperation with the sleeve threaded sleeve 301b, and the sleeve threaded connector 302a is threadedly connected with the sleeve threaded sleeve 301b to form the external sleeve mechanism 300;

[0078] The external sleeve 302 has an external thread structure 302c arranged on the circumferential outer wall of the external sleeve 302 for threadedly connecting with the middle nut 401a of the fixed frame 401;

[0079] The sleeve anchoring disc 302b is arranged at the rear end of the external sleeve 302 for cooperation with the push rod anchoring disc 202b, and the push rod anchoring disc 202b is arranged at the rear side of the sleeve anchoring disc 302b, and the two groups of anchoring discs are arranged with arc-shaped anchoring holes corresponding in position, and the front and rear groups of anchoring discs are fixed by arranging a wire in the arc-shaped anchoring holes to ensure that the device remains stable during the concrete pouring process.

[0080] The fixing mechanism 400 comprises a fixed frame 401 for fixing the device on a steel mold and adjusting the position of the device to meet the requirements of the steel reinforcement layer control, and the specific structure comprises:

[0081] The fixed frame 401 has a nut 401a arranged at the middle portion, and a fixed bolt 401b arranged around the nut 401a, and a magnetic block 401c arranged at the end of the fixed bolt 401b;

[0082] 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;

[0083] The middle nut 401a is threadedly connected with the external thread structure 302c of the external sleeve 302, and by adjusting the position of the middle nut 401a on the external sleeve 302, the relative position of the fixed frame 401 and the external sleeve mechanism 300 can be adjusted to meet the requirements of the steel reinforcement layer control.

[0084] The embodiment also provides an implementation method of the external and internal expansion type steel reinforcement layer control device, which comprises the following specific steps:

[0085] 1. The device assembly steps are as follows:

[0086] The inner push rod 201 and the outer push rod 202 are threadedly connected through the push rod threaded sleeve 201b and the push rod threaded connector 202a, and are assembled into the inner push rod mechanism 200;

[0087] The inner sleeve 301 and the outer sleeve 302 are threadedly connected through the sleeve threaded sleeve 301b and the sleeve threaded connector 302a, and are assembled into the outer sleeve mechanism 300;

[0088] The fixing frame 401 is installed on the outer thread 302c of the outer sleeve 302;

[0089] The inner push rod mechanism 200 is sleeved into the outer sleeve mechanism 300;

[0090] The front end limiting mechanism 100 is connected and fixed with the inner push rod mechanism 200 and the outer sleeve mechanism 300 respectively, and the assembly of the device is completed.

[0091] 2. The device installation steps are as follows:

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

[0093] Adjust the relative position of the fixing frame 401 and the outer sleeve mechanism 300 to meet the requirements of the reinforcement protective layer control;

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

[0095] Push the inner push rod mechanism 200 to unfold the front end limiting mechanism 100, so that the reinforcement is in contact with the limiting plate 102;

[0096] The outer push rod 202 and the outer sleeve 302 are fixed with a wire at the arc-shaped anchoring hole 202b-1, 302b-1 of the rear end anchoring disc 202b, 302b, to ensure that the device remains stable during the concrete pouring process, and the installation of the device is completed.

[0097] 3. The device removal steps are as follows:

[0098] After the concrete reaches the strength, the outer push rod 202, the outer sleeve 302 and the fixing frame 401 are removed, and the device is removed;

[0099] The outer push rod 202, the outer sleeve 302 and the fixing frame 401 can be reused, reducing resource waste and reducing construction cost.

[0100] Further, each group of reinforced protection layer control devices needs to use a set of front end limiting mechanism 100, a set of built-in push rod 201, a set of external push rod 202, a set of built-in sleeve 301, a set of external sleeve 302 and a set of fixing frame 401 during the assembly and use process. Among them, the external push rod 202, the external sleeve 302 and the fixing frame 401 can be reused, which significantly improves the resource utilization rate and reduces the construction cost.

[0101] The embodiment describes in detail the structure, assembly, installation and disassembly method of the above-mentioned external and internal expansion type reinforced protection layer control device. Through the synergistic effect 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 realized. The device can effectively solve the problems of traditional reinforced protection layer control devices in actual application, and improve the safety and durability of reinforced concrete structures.

[0102] Importantly, it should be noted that the constructions and arrangements of the present application shown in the various example embodiments are by way of illustration only. Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described in this application. For example, elements shown as integrally formed can be constructed of multiple parts or elements, the position of elements can be reversed or otherwise varied, and the nature or number of elements or positions can be altered or varied. Accordingly, all such modifications are intended to be included within the scope of the present application. The order or sequence of any process or method steps can be changed or re-sequenced without departing from the generality of the application. In the claims, any means-plus-function clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions can be made in the design, operating conditions and arrangement of the example embodiments without departing from the scope of the present application. Accordingly, the present application is not limited to particular embodiments described, but extends to various modifications, combinations and permutations of the described embodiments.

[0103] Furthermore, in order to provide a brief description of the example embodiments, not all features of an actual implementation can be described (i.e., those features that are not relevant to the best mode for carrying out the present application currently being considered, or those features that are not relevant to implementing the present application).

[0104] It is to be understood that the development of the particular implementations described herein was motivated by the desire to solve real-world problems, and as such the claimed implementations can be susceptible to further implementation while still being generically consistent with the descriptions provided herein. Specifically, although many of the examples provided herein describe particular implementations with reference to particular applications for illustration, those of ordinary skill in the art will recognize that the described implementations can be used in other applications and / or modified to be used in other applications and that the descriptions provided herein do not limit the claimed implementations to the applications described by way of example. Those skilled in the art will readily recognize a variety of applications for the claimed implementations.

[0105] It should be noted that the above examples are only used to illustrate the technical solutions of the present application but not limit the present application. Although the present application is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the spirit and scope of the present application, which should be covered by the claims of the present application.

Claims

1. An external cover and spread type reinforcement cover control device, characterized by: The utility model relates to a steel bar protective layer control device, which comprises a front end limiting mechanism (100), an internal push rod mechanism (200), an external sleeve mechanism (300) and a fixing mechanism (400). The front end limiting mechanism (100) is arranged at the front end of the device and is used for limiting and fixing the steel bar. The internal push rod mechanism (200) comprises an internal push rod (201) and an external push rod (202) and is used for controlling the expansion and contraction of the front end limiting mechanism (100) through a push-pull action. The external sleeve mechanism (300) comprises an internal sleeve (301) and an external sleeve (302) and is used for accommodating the internal push rod mechanism (200) and providing internal guidance and external support for the internal push rod mechanism (200). The fixing mechanism (400) comprises a fixing frame (401) and is used for fixing the device on a steel mold and adjusting the position of the device to meet the requirements of the steel bar protective layer control. The front end limiting mechanism (100) comprises two connecting plates (101), two limiting plates (102), two elastic washers (103), two connecting limiting plate anchor bolts (104), one limiting plate anchor bolt (105) and one connecting plate anchor bolt (106). Each of the two connecting plates (101) has two connecting holes formed at two ends thereof. Each of the two limiting plates (102) has a connecting hole formed at the middle part and one end thereof. The two elastic washers (103) are arranged at the connecting parts of the upper and lower limiting plates (102) and have a connecting hole formed at the middle part thereof. The two connecting limiting plate anchor bolts (104) are used for connecting the connecting plates (101) and the limiting plates (102). The limiting plate anchor bolt (105) is used for connecting the limiting plates (102) and the elastic washers (103). The connecting plate anchor bolt (106) is used for connecting the upper and lower connecting plates (101). The limiting plate (102) is limited in the center of the internal sleeve (301) through the cooperation of the limiting plate anchor bolt (105) and the elastic washer (103), so that the front end limiting mechanism (100) is connected with the external sleeve mechanism (300). The elastic washer (103) is used for providing a buffer when the limiting plate (102) contacts the steel bar, so as to prevent the surface of the steel bar from being damaged. The connecting plate (101) is movably connected with the internal push rod (201) through the connecting plate anchor bolt (106), so that the front end limiting mechanism (100) is connected with the internal push rod mechanism (200). The internal push rod mechanism (200) comprises the internal push rod (201) and the external push rod (202). The internal push rod (201) has a sheet-shaped connecting head (201a) arranged at the front end thereof and used in cooperation with the connecting plate anchor bolt (106) and has a push rod threaded sleeve (201b) arranged at the rear end thereof.

2. The external form-tie control device of claim 1, wherein: The external push rod (202) has a push rod threaded connecting head (202a) arranged at the front end thereof and adapted in structure to the push rod threaded sleeve (201b), and the push rod threaded connecting head (202a) is threadedly connected with the push rod threaded sleeve (201b). The external sleeve mechanism (300) comprises the internal sleeve (301) and the external sleeve (302). The internal sleeve (301) has a front end opening (301a) formed at the front end thereof and used for the expansion and contraction of the front end limiting mechanism (100) and has a sleeve threaded sleeve (301b) arranged at the rear end thereof. The external sleeve (302) has a sleeve threaded connecting head (302a) arranged at the front end thereof and used in cooperation with the sleeve threaded sleeve (301b), and the sleeve threaded connecting head (302a) is threadedly connected with the sleeve threaded sleeve (301b).

3. The external form-tie formwork control device of claim 2, wherein: The outer sleeve (302) is provided with an external thread structure on the circumferential outer wall, the middle part of the fixing frame (401) is provided with a middle nut (401a) matched with the external thread structure, and the outer sleeve (302) is threadedly connected with the middle nut (401a) through the external thread structure, so that the relative position of the fixing frame (401) and the outer sleeve mechanism (300) is adjusted by adjusting the position of the middle nut (401a) on the outer sleeve (302), so as to meet the requirement of the reinforcement cover control.

4. The external form-tie control device of claim 3, wherein: The rear end of the outer push rod (202) is provided with a push rod anchoring disc (202b), the rear end of the outer sleeve (302) is provided with a sleeve anchoring disc (302b), 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 corresponding arc-shaped anchoring holes, and the front and rear groups of anchoring discs are fixed by arranging the wire in the arc-shaped anchoring hole, so as to ensure that the device remains stable during the concrete pouring process.

5. The external form-tie bar control apparatus of claim 4, wherein: The fixing mechanism (400) comprises, The fixing frame (401) is provided with a nut (401a) in the middle, and the nut (401a) is provided with a fixing bolt (401b) around, and a magnetic block (401c) is arranged at the end of the fixing bolt (401b); The magnetic block (401c) is used for firmly adsorbing the device on the steel mold, so as to ensure that the device does not displace during the concrete pouring process.

6. The method of claim 5, wherein the method further comprises: Comprise, ​ S1: device assembly step: the inner push rod (201) and the outer push rod (202) are combined and assembled into an inner push rod mechanism (200); the inner sleeve (301) and the outer sleeve (302) are combined and assembled into an outer sleeve mechanism (300); the fixing frame (401) is installed on the outer thread (302c) of the outer sleeve (302); the inner push rod mechanism (200) is sleeved into the outer sleeve mechanism (300); the front end limiting mechanism (100) is respectively connected and fixed with the inner push rod mechanism (200) and the outer sleeve mechanism (300), and the assembly of the device is completed; S2: device installation step: the device is inserted into the steel mold reserved hole from the outside; the relative position of the fixing frame (401) and the outer sleeve mechanism (300) is adjusted to meet the requirement of the reinforcement cover control; the fixing frame (401) is magnetically adsorbed on the steel mold; the inner push rod mechanism (200) is pushed to expand the front end limiting mechanism (100), so that the reinforcement is abutted with the limiting plate (102); the arc-shaped anchoring holes of the two groups of anchoring discs on the outer push rod (202) and the outer sleeve (302) are fixed with wire, and the installation of the device is completed; S3: device disassembly step: after the concrete reaches the strength, the outer push rod (202), the outer sleeve (302) and the fixing frame (401) which are convenient for repeated use are removed, and the disassembly of the device is completed.

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