Built-in bridge auxiliary connection embedded parts structure and design method and embedded components

Abstract

The present invention relates to a built-in bridge accessory connection embedded part structure and a design method and embedded assembly thereof. A built-in bridge accessory connection embedded part structure includes a sleeve and a connecting rod placed inside the sleeve, the sleeve is used to be embedded in the pier body, the outer end of the sleeve is used to be flush with the inner wall of the template of the pier body, the outer end of the connecting rod can be pulled out or popped out from the sleeve, and the outer end of the connecting rod is used to connect the bridge accessory structure; when the outer end of the connecting rod can be connected to the bridge accessory structure, the sleeve can limit the movement of the connecting rod outside the sleeve. The template construction and casting of the pier have no effect on the embedding of the sleeve and the connecting rod, ensuring the effectiveness of the sleeve and the connecting rod. After the template is removed, the outer end of the connecting rod can be directly pulled out or popped out from the sleeve to connect the bridge accessory structure. When the outer end of the connecting rod is connected to the bridge accessory structure, the sleeve can limit the movement of the connecting rod outside the sleeve, ensuring a stable connection to the bridge accessory structure and improving the convenience of later construction.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge accessory structure connection, in particular to an embedded bridge accessory connection pre-embedded part structure, its design method and pre-embedded components. Background Art

[0002] During the operation stage of a bridge, it is necessary to regularly inspect the bridge pier and beam to promptly detect and handle diseases to ensure the safety of the bridge. The currently commonly used method is to pre-embed U-shaped bolts inside the hollow pier and outside the pier top cap during the construction of the bridge pier, connect angle steel brackets, set angle steel stoppers on the angle steel brackets, and lay steel grating tread plates to form an inspection platform for bridge maintenance operations.

[0003] The method of pre-embedding U-shaped bolts has the following problems:

[0004] (1) Before pouring the pier, U-shaped bolts are pre-embedded for installing the platform bracket. Since a certain length of the U-shaped bolts is exposed outside the pier wall, holes need to be drilled at the corresponding positions of the pier formwork for installation. At the same time, it is more difficult to remove the pier formwork, and it is easy to collide with the bracket when removing the formwork, posing a greater safety risk.

[0005] (2) When removing the formwork, it is easy to touch the exposed part of the U-shaped bolts, causing damage to the bolt threads and making it difficult to install the platform bracket later.

[0006] (3) There are many holes in the formwork, and it is easy to cause slurry leakage at the hole openings. After removing the formwork, it affects the appearance quality of the pier.

[0007] The above problems cause the exposed part of the pre-embedded U-shaped bolts to be unusable. When installing the angle steel bracket of the inspection platform, it is necessary to drill new holes and use expansion bolts for installation, which is easy to damage the pier reinforcement, has a certain impact on the force and appearance of the pier, and is difficult to ensure safety, with a large workload, high construction difficulty, and difficult quality control. Summary of the Invention

[0008] The purpose of the present invention is to provide an embedded bridge accessory connection pre-embedded part structure, its design method and pre-embedded components for the problem that when using the method of pre-embedding U-shaped bolts to connect bridge accessory structures in the prior art, the formwork of the bridge pier needs to be drilled, and there will be interference between the installation and removal of the formwork and the pre-embedded U-shaped bolts, resulting in slurry leakage at the hole openings of the formwork, difficult installation and removal of the formwork, and easy damage to the bolt threads of the U-shaped bolts due to collision with the formwork.

[0009] In order to achieve the above purpose, the technical solution adopted by the present invention is:

[0010] An internal bridge accessory connection embedded part structure includes a sleeve and a connecting rod placed inside the sleeve. The sleeve is used to be embedded in the pier body, the outer end of the sleeve is flush with the inner wall of the formwork of the pier body, the outer end of the connecting rod can be pulled out or popped out from the sleeve, and the outer end of the connecting rod is used to connect the bridge accessory structure;

[0011] When the outer end of the connecting rod can connect the bridge accessory structure, the sleeve can restrict the connecting rod from moving outward from the sleeve.

[0012] In this solution, the connecting rod is located inside the sleeve and is embedded in the pier body together with the sleeve. When embedding, the outer end of the sleeve is flush with the inner wall of the formwork of the pier body. Therefore, the embedded sleeve will not interfere with the formwork, and there is no need to drill holes in the formwork of the bridge pier, no need to position the hole opening position of the formwork, and it will not damage the formwork, nor will there be a problem of formwork leakage caused by hole opening, effectively ensuring the integrity of the formwork and the aesthetics of the bridge pier. When embedding the sleeve, the outer end of the sleeve can be blocked by a rubber plug or other rubber sealing parts, which will not affect the installation of the formwork, that is, the embedding of the sleeve has no impact on the installation and removal of the formwork, improving the convenience and safety of construction. The sealing of the outer end of the sleeve by the sealing part can prevent mud from entering the sleeve when pouring the bridge pier, avoiding that after the formwork is removed later, the outer end of the connecting rod cannot be pulled out or popped out from the sleeve, and the formwork will not cause extrusion or other damages to the sleeve and the connecting rod. That is, the formwork construction and the pouring of the bridge pier have no impact on the embedding of the sleeve and the connecting rod, ensuring the effectiveness of the sleeve and the connecting rod. When the formwork is removed, the outer end of the connecting rod can be directly pulled out or popped out from the sleeve, and then the outer end of the connecting rod is used to connect the bridge accessory structure. When the outer end of the connecting rod connects the bridge accessory structure, since the sleeve can restrict the connecting rod from moving outward from the sleeve, the stable connection of the bridge accessory structure is guaranteed, improving the convenience of later construction.

[0013] Preferably, the sleeve has a through hole axially penetrating through it. The inner end of the through hole is closed. The connecting rod is placed in the through hole. The outer end of the connecting rod is aligned with the outer end of the through hole or located inside the outer end of the through hole. The connecting rod can move axially along the through hole, and the outer end of the connecting rod can be pulled out or popped out from the outer end of the through hole;

[0014] An inner hole step axially inward along the through hole is provided on the inner side of the inner end of the through hole; a limiting step axially outward along the through hole is provided on the outer side of the inner end of the connecting rod. When the outer end of the connecting rod can connect the bridge accessory structure, the inner hole step can restrict the limiting step from moving outward from the outer end of the through hole.

[0015] The inner end of the through hole is closed to prevent concrete from entering the sleeve and affecting the pulling out or popping out of the outer end of the connecting rod from the outer end of the through hole. When the outer end of the connecting rod is aligned with the outer end of the through hole, it is convenient to take out the connecting rod; when the outer end of the connecting rod is located inside the outer end of the through hole, it is convenient for the plugging member to enter the sleeve for plugging, and the plugging effect on the outer end of the sleeve is better. After the formwork is removed, by pulling out or popping out the outer end of the connecting rod from the outer end of the through hole, the outer end of the connecting rod can be used to connect the bridge accessory structure, and the inner hole step on the inner side of the inner end of the through hole of the sleeve along the axial direction of the through hole can limit the outer limit step on the outer side of the inner end of the connecting rod along the axial direction of the through hole, so that when the outer end of the connecting rod can connect the bridge accessory structure, the connecting rod cannot move outwards along the through hole any more.

[0016] Preferably, at least two of the inner hole steps are provided in the through hole, and the inner diameters of all the inner hole steps gradually decrease from the inside to the outside along the axial direction of the through hole. The connecting rod is provided with the limit steps corresponding to each of the inner hole steps; there are relationship a, relationship b or relationship c between the distances between adjacent two of the inner hole steps and the distances between the corresponding adjacent two of the limit steps:

[0017] Relationship a: The distances between adjacent two of the inner hole steps are equal to the distances between the corresponding adjacent two of the limit steps;

[0018] Relationship b: The distances between adjacent two of the inner hole steps are not equal to the distances between the corresponding adjacent two of the limit steps;

[0019] Relationship c: The distances between some adjacent two of the inner hole steps are equal to the distances between the corresponding adjacent two of the limit steps, and the distances between the remaining adjacent two of the inner hole steps are not equal to the distances between the corresponding adjacent two of the limit steps.

[0020] Adopting the above scheme, at least two of the inner hole steps and the corresponding limit steps are provided, that is, at least two pairs of paired limits of the inner hole steps and the limit steps can be formed.

[0021] When the distances between adjacent two of the inner hole steps are equal to the distances between the corresponding adjacent two of the limit steps, that is, when it is relationship a, when the outer end of the connecting rod connects the bridge accessory structure, all the inner hole steps and the corresponding limit steps can be utilized simultaneously, which can improve the connection ability and ensure the safety and reliability of the connection; and when all the inner hole steps and the corresponding limit steps are utilized simultaneously, it is not easy to be damaged simultaneously, which can improve the safety performance; under this design, the sizes of the sleeve and the connecting rod can be reduced, and materials can be saved.

[0022] When the distance between two adjacent inner steps of the holes is not equal to the distance between two adjacent corresponding limiting steps, it is relationship b. Then, when the outer end of the connecting rod is connected to the bridge accessory structure, one inner step of the hole and the corresponding limiting step are first used to provide the tensile force of the connecting rod, while the other inner steps of the holes and the corresponding limiting steps are not used temporarily. By adopting this method, insurance can be provided for the tensile force of the connecting rod. That is, after the limit between the first - used inner step of the hole and the corresponding limiting step fails, the remaining unused inner steps of the holes and the corresponding limiting steps can provide the tensile force, avoiding the complete failure of the limit between the connecting rod and the sleeve, ensuring that the connection with the bridge accessory structure does not completely disappear. And then, by adjusting the connection length between the bridge accessory structure and the connecting rod, the corresponding built - in bridge accessory connection pre - embedded part structure can continue to provide the connection force without replacement.

[0023] When it is relationship c, the distances between two adjacent inner steps of some of the holes are equal to the distances between two adjacent corresponding limiting steps, and the distances between two adjacent inner steps of the remaining part are not equal to the distances between two adjacent corresponding limiting steps. Relationship a and relationship b can be utilized simultaneously, resulting in better connection effect and higher safety.

[0024] Preferably, the inner step at the outermost end of the through - hole is adjacent to a through - hole outward.

[0025] The diameter of the through - hole gradually increases from inside to outside along its axial direction. The limiting step at the outermost end of the connecting rod is adjacent to a through - section outward. The outer wall of the through - section and the inner wall of the through - hole are adaptively arranged.

[0026] When the connecting rod is connected to the bridge accessory structure, the load is the largest at the interface of the pier wall of the bridge pier. By adopting the above - mentioned scheme, by setting the through - section adjacent to the limiting step at the outermost end of the connecting rod as a structure that gradually increases from inside to outside along its axial direction, both the connecting rod and the outer end of the sleeve are considered in the form of variable cross - sections, making the shear - resistance, bending - resistance, tensile - resistance, etc. of the connecting rod at the interface of the pier wall of the bridge pier better, and enabling the optimization of the cross - section and the saving of materials.

[0027] Preferably, the outer end of the through - section has a connecting section for connecting the bridge accessory structure. The outer end of the through - hole has an outer - end hole, and the connecting section is arranged in the outer - end hole. The diameter of the outer end of the outer - end hole is equal to the diameter of the inner end of the outer - end hole, making the connecting section a constant - cross - section section, which is convenient for connecting the bridge accessory structure, and the outer - end hole is a constant - cross - section hole, which is more convenient for plugging.

[0028] Preferably, an elastic body is connected to the inner end of the through - hole along its axial direction. The outer end of the elastic body is arranged close to the inner end of the connecting rod. Under the action of the outward elastic force of the elastic body, the outer end of the connecting rod can pop out from the outer end of the through - hole.

[0029] By arranging an elastomer between the inner end of the through hole and the inner end of the connecting rod, when embedding the built-in bridge accessory connecting pre-embedded part structure, the elastomer is in a natural state and is not affected by other axial external forces; after the formwork is removed, by squeezing the connecting rod inward, the connecting rod squeezes the elastomer, and under the reverse acting force of the elastomer, the connecting rod will be ejected. Its operation is convenient and it is convenient to take out and use the outer end of the connecting rod.

[0030] Preferably, the outer end of the elastomer is connected to the inner end of the connecting rod to prevent the elastomer from bending in the natural state and affecting the ejection effect of the connecting rod; and after the connecting rod is ejected by the elastomer, the elastomer can also provide a pulling force for the connecting rod to enhance the connection effect between the connecting rod and the bridge accessory structure.

[0031] Preferably, a through hole is adjacently arranged outward from the inner step at the outermost end of the through hole, and at least one layer of polytetrafluoroethylene plate is arranged inside the through hole to install and position the connecting rod arranged inside the sleeve, and by using the lubricity of the polytetrafluoroethylene plate, the frictional resistance between the connecting rod and the inside of the sleeve is reduced, which is convenient for taking out the built-in connecting rod outward, and at the same time, it can effectively prevent water vapor from entering the sleeve and causing the connecting rod to rust.

[0032] A design method for a built-in bridge accessory connecting pre-embedded part structure includes the following three situations:

[0033] First, design the described built-in bridge accessory connecting pre-embedded part structure, and the built-in bridge accessory connecting pre-embedded part structure has an inner step in the hole and a limiting step, and both the inner step in the hole and the limiting step are rotating bodies. Then, the inner diameter of the inner step in the hole, the outer diameter of the limiting step, and the thickness existing in the outer diameter of the limiting step are jointly adjusted through Formula 1 and Formula 2. The Formula 1 is:

[0034]

[0035] The Formula 2 is:

[0036]

[0037] In Formula 1 and Formula 2, N is the tensile force acting axially outward along the through hole that the connecting rod needs to bear; r is the outer diameter of the limiting step; D is the inner diameter of the inner step in the hole; h is the thickness existing in the outer diameter of the limiting step; [σ g is the allowable compressive stress of the material of the connecting rod; [σ t is the allowable compressive stress of the material of the sleeve; [τ g is the allowable shear stress of the material of the connecting rod;

[0038] Second, design the described built-in bridge accessory connection pre-embedded part structure. At least two inner steps are provided in the through hole, and the inner diameters of all the inner steps in the hole gradually decrease from inside to outside along the axial direction of the through hole. The connecting rod is provided with the limiting steps corresponding to each inner step in the hole; and the distance between two adjacent inner steps in the hole and the distance between the corresponding adjacent limiting steps are in relationship a. Both the inner step in the hole and the limiting step are rotating bodies. The inner steps in the hole from inside to outside along the axial direction of the through hole are the first inner step in the hole, the second inner step in the hole, ……, the i-th inner step in the hole in sequence. The limiting steps from inside to outside along the connecting rod are the first limiting step, the second limiting step, ……, the i-th limiting step in sequence. i is greater than or equal to 2 and i is an integer. Then, adjust the inner diameter of the first inner step in the hole, the outer diameter of the first limiting step, the thickness existing in the outer diameter of the first limiting step, the inner diameter of the i-th inner step in the hole, the outer diameter of the i-th limiting step, and the thickness existing in the outer diameter of the i-th limiting step through Formula 3 and Formula 4. The Formula 3 is:

[0039]

[0040] The Formula 4 is:

[0041]

[0042] In the Formula 3 and the Formula 4, N is the tensile force along the axial direction of the through hole that the connecting rod needs to bear; r is the outer diameter of the first limiting step; D is the inner diameter of the inner step in the hole; h is the thickness existing in the outer diameter of the first limiting step; di is the outer diameter of the i-th limiting step; Di is the inner diameter of the i-th inner step in the hole; s i is the thickness existing in the outer diameter of the i-th limiting step; [σ g is the allowable compressive stress of the material of the connecting rod; [σ t is the allowable compressive stress of the material of the sleeve; [τ g is the allowable shear stress of the material of the connecting rod;

[0043] Thirdly, design the described built-in bridge accessory connecting embedded part structure. At least two inner steps are provided in the through hole, and the inner diameters of all the inner steps in the hole gradually decrease from inside to outside along the axial direction of the through hole. The connecting rod is provided with the limiting steps corresponding to each inner step in the hole; and the distance between two adjacent inner steps in the hole and the distance between the corresponding adjacent limiting steps are in relationship b. The inner steps in the hole and the limiting steps are both rotating bodies. The inner steps in the hole from inside to outside along the axial direction of the through hole are the first inner step in the hole, the second inner step in the hole, ……, the i-th inner step in the hole in sequence. The limiting steps from inside to outside along the connecting rod are the first limiting step, the second limiting step, ……, the i-th limiting step in sequence. i is greater than or equal to 2 and i is an integer. Then, adjust the inner diameter of the first inner step in the hole, the outer diameter of the first limiting step, the thickness existing on the outer diameter of the first limiting step, the inner diameter of the i-th inner step in the hole, the outer diameter of the i-th limiting step, and the thickness existing on the outer diameter of the i-th limiting step through Formula Five and Formula Six. The Formula Five is:

[0044] (di 2 -Di 2 )>(r 2 -D 2 )

[0045] The Formula Six is:

[0046] (Di×si)>(D×h)

[0047] In Formula Five and Formula Six, r is the outer diameter of the first limiting step; D is the inner diameter of the inner step in the hole; h is the thickness existing on the outer diameter of the first limiting step; di is the outer diameter of the i-th limiting step; Di is the inner diameter of the i-th inner step in the hole; si is the thickness existing on the outer diameter of the i-th limiting step.

[0048] By adopting the above design method of the built-in bridge accessory connecting embedded part structure, the corresponding dimensions of the sleeve and the connecting rod can be adjusted more accurately and quickly.

[0049] An embedded component includes at least two of the described built-in bridge accessory connecting embedded part structures. The inner ends of the sleeves are all connected by connecting steel bars, and the connecting steel bars are connected to the pier body steel bars of the pier body.

[0050] When the sleeves are embedded, according to the connection setting situation of the inspection platform support, multiple sleeves can be connected at the inner ends by connecting steel bars to form an embedded component and be embedded together. And during the embedding, they are connected to the pier body steel bars through the connecting steel bars to increase the integrity of the sleeves and improve the safety of the connection.

[0051] In summary, due to the adoption of the above technical solutions, the beneficial effects of the present invention are:

[0052] 1. In the built-in bridge accessory connection pre-embedded part structure of the present invention, the connecting rod is located inside the sleeve and is pre-embedded in the pier body together with the sleeve. When pre-embedding, the outer end of the sleeve is flush with the inner wall of the formwork of the pier body. Therefore, the pre-embedded sleeve will not interfere with the formwork, and there is no need to drill holes in the formwork of the bridge pier, no need to position the hole opening position of the formwork, will not damage the formwork, and will not cause the problem of formwork leakage due to hole opening, effectively ensuring the integrity of the formwork and the aesthetics of the bridge pier. Moreover, the formwork construction and the pouring of the bridge pier have no influence on the pre-embedding of the sleeve and the connecting rod, ensuring the effectiveness of the sleeve and the connecting rod. After the formwork is removed, the outer end of the connecting rod can be directly pulled out or ejected from the sleeve, and then the outer end of the connecting rod is used to connect the bridge accessory structure. When the outer end of the connecting rod connects the bridge accessory structure, the sleeve can limit the movement of the connecting rod out of the sleeve, thereby ensuring the stable connection of the bridge accessory structure and improving the convenience of later construction.

[0053] 2. In the built-in bridge accessory connection pre-embedded part structure of the present invention, after the formwork is removed, by pulling out or ejecting the outer end of the connecting rod from the outer end of the through hole, the outer end of the connecting rod can be used to connect the bridge accessory structure, and the inner hole step of the inner side of the inner end of the through hole of the sleeve along the axial direction of the through hole can limit the outer limit step of the inner end of the connecting rod along the axial direction of the through hole outward, so that when the outer end of the connecting rod can connect the bridge accessory structure, the connecting rod cannot move outward along the through hole.

[0054] 3. In the built-in bridge accessory connection pre-embedded part structure of the present invention, by providing at least two of the inner-hole steps and the corresponding limiting steps, at least two pairs of paired limits of the inner-hole steps and the limiting steps can be formed. When the distance between two adjacent inner-hole steps is equal to the distance between the corresponding two adjacent limiting steps, and when the outer end of the connecting rod is connected to the bridge accessory structure, all the inner-hole steps and the corresponding limiting steps can be utilized simultaneously, which can improve the connection ability and ensure the safety and reliability of the connection. Moreover, when all the inner-hole steps and the corresponding limiting steps are utilized simultaneously, they are not easily damaged simultaneously, which can improve the safety performance. Under this design, the size of the sleeve and the size of the connecting rod can be reduced, saving materials. When the distance between two adjacent inner-hole steps is not equal to the distance between the corresponding two adjacent limiting steps, when the outer end of the connecting rod is connected to the bridge accessory structure, one of the inner-hole steps and the corresponding limiting step is first used to provide the tensile force of the connecting rod, while the other inner-hole steps and the corresponding limiting steps are not used temporarily. By adopting this method, insurance can be provided for the tensile force of the connecting rod, that is, after the limit between the first-used inner-hole step and the corresponding limiting step fails, the remaining unused inner-hole steps and the corresponding limiting steps can provide the tensile force, avoiding the complete failure of the limit between the connecting rod and the sleeve and ensuring that the connection with the bridge accessory structure does not completely disappear. And then, by adjusting the connection length between the bridge accessory structure and the connecting rod, the corresponding built-in bridge accessory connection pre-embedded part structure can continue to be used to provide the connection force without replacement.

[0055] 4. In the built-in bridge accessory connection pre-embedded part structure of the present invention, by providing an elastic body between the inner end of the through-hole and the inner end of the connecting rod, after the formwork is removed, by inwardly pressing the connecting rod, the connecting rod presses the elastic body, and under the reverse acting force of the elastic body, the connecting rod will be ejected, which is convenient to operate and convenient for taking out and using the outer end of the connecting rod.

[0056] 5. In the built-in bridge accessory connection pre-embedded part structure of the present invention, at least one layer of polytetrafluoroethylene plate is provided inside the through-hole to install and position the connecting rod inside the sleeve, and by using the lubricity of the polytetrafluoroethylene plate, the frictional resistance between the connecting rod and the inside of the sleeve is reduced, which is convenient for taking out the built-in connecting rod outward, and at the same time, water vapor can be effectively prevented from entering the sleeve to cause the connecting rod to rust.

[0057] 6. A design method for the built-in bridge accessory connection pre-embedded part structure can adjust the corresponding sizes of the sleeve and the connecting rod more accurately and quickly.

[0058] 7. For a pre-embedded component, a plurality of sleeves are connected at the inner ends through connecting steel bars to form a pre-embedded component and are pre-embedded together, and during the pre-embedding, they are connected to the pier body steel bars through the connecting steel bars to increase the integrity of the sleeves and improve the safety of the connection. Description of the Drawings

[0059] Figure 1 It is a schematic structural diagram of the built-in bridge accessory connecting embedded part structure described in Embodiment 1;

[0060] Figure 2 It is a schematic structural diagram of the sleeve in Embodiment 1;

[0061] Figure 3 It is a schematic structural diagram of the connecting rod in Embodiment 1;

[0062] Figure 4 It is a schematic diagram of the state after the outer end of the connecting rod in Embodiment 1 is taken out;

[0063] Figure 5 It is a schematic diagram of the outer end face of the built-in bridge accessory connecting embedded part structure described in Embodiment 1;

[0064] Figure 6 It is a schematic diagram of the embedded state of the built-in bridge accessory connecting embedded part structure described in Embodiment 1;

[0065] Figure 7 It is a schematic structural diagram of the built-in bridge accessory connecting embedded part structure described in Embodiment 2;

[0066] Figure 8 It is a schematic structural diagram of the sleeve in Embodiment 2;

[0067] Figure 9 It is a schematic structural diagram of the connecting rod in Embodiment 2;

[0068] Figure 10 It is a schematic diagram of the state after the outer end of the connecting rod in Embodiment 2 is taken out;

[0069] Figure 11 It is a schematic diagram of the dimension marking of the built-in bridge accessory connecting embedded part structure described in Embodiment 2;

[0070] Figure 12 It is a schematic structural diagram of the built-in bridge accessory connecting embedded part structure described in Embodiment 3;

[0071] Figure 13 It is a schematic structural diagram of the sleeve in Embodiment 3;

[0072] Figure 14 It is a schematic structural diagram of the connecting rod in Embodiment 3;

[0073] Figure 15 It is a schematic diagram of the dimension marking of the built-in bridge accessory connecting embedded part structure described in Embodiment 3;

[0074] Figure 16It is a schematic structural diagram of one of the built-in bridge accessory connection embedded parts structures in Embodiment 4;

[0075] Figure 17 It is Figure 16 a schematic diagram of the state after the outer end of the connecting rod in

[0076] Figure 18 It is Figure 16 a schematic diagram of the dimension marking of the built-in bridge accessory connection embedded part structure in

[0077] Figure 19 It is a schematic structural diagram of another of the built-in bridge accessory connection embedded parts structures in Embodiment 4;

[0078] Figure 20 It is Figure 19 a schematic diagram of the state after the outer end of the connecting rod in

[0079] Figure 21 It is Figure 19 a schematic diagram of the dimension marking of the built-in bridge accessory connection embedded part structure in

[0080] Figure 22 It is a schematic structural diagram of the embedded component in Embodiment 6.

[0081] Icon: 1 - Sleeve; 11 - Connecting steel bar; 2 - Connecting rod; 21 - Load-bearing section; 211 - Second load-bearing section; 212 - First load-bearing section; 22 - Passing section; 23 - Limiting step; 24 - Connecting section; 3 - Through hole; 31 - Limiting hole; 32 - Passing hole; 33 - Inner hole step; 34 - Outer end hole; 4 - Elastic body; 5 - Polytetrafluoroethylene plate; 6 - Pier body; 61 - Pier wall; 62 - Pier body steel bar. Detailed implementation manners

[0082] The present invention will be described in detail below with reference to the drawings.

[0083] In order to make the purpose, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0084] Embodiment 1

[0085] A built-in bridge accessory connection embedded part structure, see Figures 1-6 , including a sleeve 1 and a connecting rod 2 placed inside the sleeve 1. As Figure 6 shown, the sleeve 1 is used to be embedded in the pier body 6, and the outer end of the sleeve 1 is flush with the inner wall of the formwork of the pier body 6. As Figure 4As shown, the outer end of the connecting rod 2 can be pulled out or ejected from the sleeve 1, and the outer end of the connecting rod 2 is used to connect the bridge accessory structure;

[0086] When the outer end of the connecting rod 2 can connect the bridge accessory structure, the sleeve 1 can restrict the connecting rod 2 from moving outward from the sleeve 1.

[0087] In this solution, the connecting rod 2 is located inside the sleeve 1 and is pre-embedded in the pier body 6 together with the sleeve 1, as Figure 6 shown. And during pre-embedding, the outer end of the sleeve 1 is flush with the inner wall of the formwork of the pier body 6. Therefore, the pre-embedded sleeve 1 will not interfere with the formwork, nor is it necessary to open holes in the formwork of the bridge pier, nor is it necessary to position the hole opening position of the formwork, nor will it damage the formwork, nor will there be a problem of formwork leakage due to hole opening, effectively ensuring the integrity of the formwork and the aesthetics of the bridge pier. When the sleeve 1 is pre-embedded, the outer end of the sleeve 1 can be sealed by rubber plug, rubber pad and other rubber sealing parts, which will not affect the installation of the formwork, that is, the pre-embedding of the sleeve 1 has no influence on the installation and removal of the formwork, improving the convenience and safety of construction. The sealing of the outer end of the sleeve 1 by the sealing parts can prevent the mud from entering the sleeve 1 when pouring the bridge pier, avoiding that after the formwork is removed later, the outer end of the connecting rod 2 cannot be pulled out or ejected from the sleeve 1, and the formwork will not cause extrusion and other damages to the sleeve 1 and the connecting rod 2. That is, the formwork construction and the pouring of the bridge pier have no influence on the pre-embedding of the sleeve 1 and the connecting rod 2, ensuring the effectiveness of the sleeve 1 and the connecting rod 2. So that when the formwork is removed, the outer end of the connecting rod 2 can be directly pulled out or ejected from the sleeve 1, and then the outer end of the connecting rod 2 is used to connect the bridge accessory structure. When the outer end of the connecting rod 2 connects the bridge accessory structure, since the sleeve 1 can restrict the connecting rod 2 from moving outward from the sleeve 1, the stable connection of the bridge accessory structure is ensured, improving the convenience of later construction.

[0088] As Figures 1-4 shown, the sleeve 1 has a through hole 3 axially penetrating through it. The inner end of the through hole 3 is closed, that is, the left end of the through hole 3 is closed, to prevent concrete from entering the sleeve 1 and avoid affecting the pulling out or ejection of the outer end of the connecting rod 2 from the outer end of the through hole 3. The connecting rod 2 is placed in the through hole 3. The outer end of the connecting rod 2 is aligned with the outer end of the through hole 3 or is located inside the outer end of the through hole 3. The connecting rod 2 can move axially along the through hole 3, and the outer end of the connecting rod 2 can be pulled out or ejected from the outer end of the through hole 3; when the outer end of the connecting rod 2 is aligned with the outer end of the through hole 3, it is convenient to take out the connecting rod 2; when the outer end of the connecting rod 2 is located inside the outer end of the through hole 3, it is convenient for the sealing parts to enter the sleeve 1 for sealing, and the sealing effect on the outer end of the sleeve 1 is better.

[0089] Among them, the cross-sectional shapes of the through hole 3 and the connecting rod 2 are adapted, and can be circular, square, regular polygon, etc. In this embodiment, since the circular shape is the most commonly used, the following description will be based on the circular shape. For example, Figure 5 As shown.

[0090] An inner hole step 33 extending inward along the axis of the through hole 3 is provided on the inner side of the inner end of the through hole 3, that is, as Figure 2 shown, the left side of the through hole 3 is a limiting hole 31, the right side is a passing hole 32, the inner diameter of the limiting hole 31 is larger than the inner diameter of the passing hole 32, and the connection between the passing hole 32 and the limiting hole 31 forms the inner hole step 33. Among them, in Figure 2 the inner diameter of the inner hole step 33 is the inner diameter of the passing hole 32, and the outer diameter of the inner hole step 33 is the inner diameter of the limiting hole 31.

[0091] As Figure 1 shown, an outer limiting step 23 extending outward along the axis of the through hole 3 is provided on the outer side of the inner end of the connecting rod 2, that is, as Figure 3 shown, the left side of the connecting rod 2 is a load-bearing section 21, the right side is a passing section 22, the diameter of the load-bearing section 21 is larger than the diameter of the passing section 22, so that a limiting step 23 is formed at the connection between the load-bearing section 21 and the passing section 22. The outer diameter of the limiting step 23 is the diameter of the load-bearing section 21, and the inner diameter of the limiting step 23 is the diameter of the passing section 22. And the right end of the passing section 22 has a connecting section 24, and generally a thread is provided on the outer side of the connecting section 24. When the outer end of the connecting rod 2 can be connected to the bridge accessory structure, that is, after the connecting section 24 extends out of the sleeve 1, so that the thread of the connecting section 24 can be used to connect the bridge accessory structure, the inner hole step 33 can limit the outer limiting step 23 on the outer side of the inner end of the connecting rod 2 from moving towards the outer end of the through hole 3, as Figure 4 shown.

[0092] After the formwork is removed, by pulling or popping out the outer end of the connecting rod 2 from the outer end of the through hole 3. In this embodiment, when adopting the Figure 1 structure, by pulling out the outer end of the connecting rod 2, the outer end of the connecting rod 2 can be used to connect the bridge accessory structure, and the inner hole step 33 extending inward along the axis of the through hole 3 on the inner side of the inner end of the through hole 3 of the sleeve 1 can limit the outer limiting step 23 extending outward along the axis of the through hole 3 on the outer side of the inner end of the connecting rod 2, so that when the outer end of the connecting rod 2 can be connected to the bridge accessory structure, the connecting rod 2 cannot move outward along the through hole 3 anymore.

[0093] In this embodiment, as Figure 5As shown, a through hole 32 may also be provided adjacent to the outer end of the inner step 33 of the through hole 3. At least one layer of polytetrafluoroethylene plate 5 is provided inside the through hole 32 to install and position the connecting rod 2 inside the sleeve 1. By utilizing the lubricity of the polytetrafluoroethylene plate 5, the frictional resistance between the connecting rod 2 and the inside of the sleeve 1 is reduced, facilitating the outward extraction of the built-in connecting rod 2. At the same time, it can effectively prevent water vapor from entering the sleeve 1 and causing the connecting rod 2 to rust.

[0094] Embodiment 2

[0095] This embodiment provides a built-in bridge accessory connection pre-embedded part structure. On the basis of Embodiment 1, as Figures 7-11 shown, an elastic body 4 is connected to the inner end of the through hole 3 along its axial direction. The outer end of the elastic body 4 is arranged close to the inner end of the connecting rod 2. Under the outward elastic force of the elastic body 4, the outer end of the connecting rod 2 can pop out from the outer end of the through hole 3. As Figure 7 shown, an elastic body 4 is arranged along the axial direction in the limiting hole 31. The left end of the elastic body 4 is connected to the closed surface at the left end of the limiting hole 31, and the right end is adjacent to the bearing section 21 at the left end of the connecting rod 2. By arranging the elastic body 4 between the inner end of the through hole 3 and the inner end of the connecting rod 2, when pre-embedding the built-in bridge accessory connection pre-embedded part structure, the elastic body 4 is in a natural state and is not affected by other axial external forces, as Figure 7 shown; after the formwork is removed, by squeezing the connecting rod 2 inward, the connecting rod 2 squeezes the elastic body 4. Under the reverse acting force of the elastic body 4, the connecting rod 2 will pop out. That is, after pushing the connecting rod 2 to the left to squeeze the elastic body 4, under the reverse acting force to the right, the connecting rod 2 will pop out to the right, causing the connecting section 24 at its right end to extend out of the right end of the sleeve 1, as Figure 10 shown, for connecting the bridge accessory structure, which is convenient to operate and facilitates the extraction and use of the connecting section 24 at the right end of the connecting rod 2. More preferably, the outer end of the elastic body 4 is connected to the inner end of the connecting rod 2 to prevent the elastic body 4 from bending in the natural state and affecting the popping effect on the connecting rod 2; and after the connecting rod 2 is popped out by the elastic body 4, the elastic body 4 can also provide a pulling force for the connecting rod 2 to enhance the connection effect between the connecting rod 2 and the bridge accessory structure. The elastic body 4 can adopt a structure that can generate axial elastic force along the through hole 3. In this embodiment, a spring structure is preferably adopted.

[0096] Embodiment 3

[0097] This embodiment provides a built-in bridge accessory connection pre-embedded part structure. On the basis of Embodiment 1 or Embodiment 2, as Figures 12-15 shown, the through hole 32 and the through section 22 can jointly use a structure with a variable cross-section along the axial direction of the through hole 3, as Figure 13As shown, the inner hole step 33 at the outermost end of the through hole 3 is adjacent to a through hole 32 outward. The diameter of the through hole 32 gradually increases from inside to outside along its axial direction, that is, gradually increases from left to right; as Figure 14 As shown, the limiting step 23 at the outermost end of the connecting rod 2 is adjacent to a through section 22 outward. The outer wall of the through section 22 and the inner wall of the through hole 32 are adaptively arranged, that is, the diameter of the through section 22 also gradually increases from left to right, and the changing slope rate is adapted to the changing slope rate of the through hole 32.

[0098] Because when the connecting rod 2 connects the bridge accessory structure, the load is the largest at the interface of the pier wall 61 of the pier. With the above scheme, by setting the through section 22 adjacent to the limiting step 23 at the outermost end of the connecting rod 2 to be a structure that gradually increases from inside to outside along its axial direction, both the connecting rod 2 and the outer end of the sleeve 1 are considered in the form of variable cross-sections, so that the shear resistance, bending resistance, tensile resistance, etc. of the connecting rod 2 at the interface of the pier wall 61 of the pier are better, and the optimization of the cross-section and the saving of materials can be realized.

[0099] And the outer end of the through section 22 has a connecting section 24, the connecting section 24 is used to connect the bridge accessory structure, the outer end of the through hole 32 has an outer end hole 34, the connecting section 24 is arranged in the outer end hole 34, and the diameter of the outer end of the outer end hole 34 is appropriately set to be equal to the diameter of the inner end of the outer end hole 34, as Figure 12 shown, so that the connecting section 24 is an equal cross-section section, which is convenient for connecting the bridge accessory structure, and the outer end hole 34 is an equal cross-section hole, which is more convenient for plugging. In addition, because a polytetrafluoroethylene plate 5 can be arranged on the inner wall of the through hole 32, when the through hole 32 does not have a variable cross-section, the inner wall formed by the polytetrafluoroethylene plate 5 also needs to be a variable cross-section to adapt to the outer wall of the connecting section 24.

[0100] Embodiment 4

[0101] This embodiment provides a built-in bridge accessory connection pre-embedded part structure. On the basis of Embodiment 1, Embodiment 2 or Embodiment 3, refer to Figures 16-21 , in this embodiment, at least two inner hole steps 33 are arranged in the through hole 3, and the inner diameters of all the inner hole steps 33 gradually decrease from inside to outside along the axial direction of the through hole 3, as Figure 16 and Figure 19 shown, and the connecting rod 2 is provided with limiting steps 23 corresponding to each inner hole step 33.

[0102] The distance between two adjacent inner hole steps 33 and the distance between the corresponding two adjacent limiting steps 23 can have relationship a, relationship b or relationship c:

[0103] Relationship a: The distance between two adjacent inner-hole steps 33 is equal to the distance between two adjacent limiting steps 23 corresponding thereto, as shown in Figures 16-17 ; when the outer end of the connecting rod 2 is connected to the bridge accessory structure, as shown in Figure 17 , all the inner-hole steps 33 and the corresponding limiting steps 23 can be utilized simultaneously, which can improve the connection ability and ensure the safety and reliability of the connection; and when all the inner-hole steps 33 and the corresponding limiting steps 23 are utilized simultaneously, they are not easily damaged simultaneously, which can improve the safety performance; under this design, the size of the sleeve 1 and the size of the connecting rod 2 can be reduced, saving materials.

[0104] Relationship b: The distance between two adjacent inner-hole steps 33 is not equal to the distance between two adjacent limiting steps 23 corresponding thereto, as shown in Figures 19-20 ; when the outer end of the connecting rod 2 is connected to the bridge accessory structure, one of the inner-hole steps 33 and the corresponding limiting step 23 are first used to provide the tensile force of the connecting rod 2, while the other inner-hole steps 33 and the corresponding limiting steps 23 are not used temporarily. By adopting this method, insurance can be provided for the tensile force of the connecting rod 2, that is, after the limit between the first used inner-hole step 33 and the corresponding limiting step 23 fails, the remaining unused inner-hole steps 33 and the corresponding limiting steps 23 can provide tensile force, avoiding the complete failure of the limit between the connecting rod 2 and the sleeve 1 and ensuring that the connection with the bridge accessory structure does not completely disappear. And then, by adjusting the connection length between the bridge accessory structure and the connecting rod 2, the corresponding built-in bridge accessory connection pre-embedded part structure can continue to be used to provide connection force without replacement. In this way, the ratio of the connection section 24 to the passing-through section 22 can be increased, so that the set length of the thread becomes longer.

[0105] As shown in Figure 17 or Figure 20 , a total of two limiting steps 23 and two inner-hole steps 33 are provided. Correspondingly, the bearing section 21 is divided into a first bearing section 212 and a second bearing section 211 from left to right. Among them, a limiting step 23 on the left is formed at the connection between the first bearing section 212 and the second bearing section 211. The inner diameter of the limiting step 23 on the left is the diameter of the second bearing section 211, and the outer diameter of the limiting step 23 on the left is the diameter of the first bearing section 212; a limiting step 23 on the right is formed at the connection between the second bearing section 211 and the passing-through section 22. The outer diameter of the limiting step 23 on the right is the diameter of the first bearing section 212, and the inner diameter of the limiting step 23 on the right is the diameter of the passing-through section 22; the distance between the limiting step 23 on the left and the limiting step 23 on the right is the axial length of the second bearing section 211.

[0106] In Figure 17In it, the distance between the left limiting step 23 and the right limiting step 23 is equal to the distance between the left inner-hole step 33 and the right inner-hole step 33. Therefore, both the two limiting steps 23 and the two inner-hole steps 33 can be utilized simultaneously. As Figure 20 shown, the distance between the left limiting step 23 and the right limiting step 23 is greater than the distance between the left inner-hole step 33 and the right inner-hole step 33. Therefore, only the right limiting step 23 and the right inner-hole step 33 can be utilized for extrusion first to form a leftward limit and hold the connecting rod 2. Of course, it can also be designed that the distance between the left limiting step 23 and the right limiting step 23 is less than the distance between the left inner-hole step 33 and the right inner-hole step 33, and then the left limiting step 23 and the left inner-hole step 33 can be utilized for extrusion limit first. At this time, the right inner-hole step 33 and the limiting step 23 do not form an extrusion limit.

[0107] In addition to the above relationships a and b, when the number of the inner-hole steps 33 and the number of the limiting steps 23 are correspondingly greater than or equal to 3, there can also be a relationship c: the distance between some adjacent two inner-hole steps 33 is equal to the distance between the corresponding adjacent two limiting steps 23, and the distance between the remaining adjacent two inner-hole steps 33 is not equal to the distance between the corresponding adjacent two limiting steps 23. Relationships a and b can be utilized simultaneously, and the connection effect is better and the safety is higher.

[0108] Embodiment 5

[0109] This embodiment provides a design method for the built-in bridge accessory connection pre-embedded part structure, which is used to design the built-in bridge accessory connection pre-embedded part structure in the above Embodiment 1, Embodiment 2, Embodiment 3 or Embodiment 4.

[0110] When it is used to design the built-in bridge accessory connection pre-embedded part structure in the above Embodiment 1, Embodiment 2 and Embodiment 3, and the built-in bridge accessory connection pre-embedded part structure has one inner-hole step 33 and one limiting step 23, and both the inner-hole step 33 and the limiting step 23 are rotating bodies, that is, circular cross-sections, then the inner diameter of the inner-hole step 33, the outer diameter of the limiting step 23 and the thickness of the outer diameter of the limiting step 23 are jointly adjusted through Formula 1 and Formula 2.

[0111] From

[0112] it is deduced that Formula 1 is:

[0113]

[0114] From

[0115]

[0116] The derived formula two is as follows:

[0117]

[0118] As Figure 11 shown, in the above formula one and formula two, N is the tensile force along the axial direction of the through hole 3 outward that the connecting rod 2 needs to bear; r is the outer diameter of the limiting step 23; D is the inner diameter of the inner hole step 33; h is the thickness of the outer diameter of the limiting step 23; σ is the compressive stress of the connecting rod 2 at the limiting position between the inner hole step 33 and the limiting step 23; τ is the shear stress of the connecting rod 2 at the limiting position between the inner hole step 33 and the limiting step 23; [σ g is the allowable compressive stress of the material of the connecting rod 2; [σ t is the allowable compressive stress of the material of the sleeve 1; [τ g is the allowable shear stress of the material of the connecting rod 2.

[0119] When used to design the built-in bridge accessory connection pre-embedded part structure in the above-mentioned Embodiment 3, it is also necessary to be as Figure 15 shown. According to the force characteristics of the connecting rod 2, it should have properties such as shear resistance, bending resistance, and tensile resistance, and the load is the largest at the interface of the pier wall 61. Therefore, the passing section 22 of the connecting rod 2 and the passing hole 32 of the sleeve 1 are considered in the form of variable cross-sections to meet the force of the connecting rod 2 while achieving the optimization of the cross-section and the saving of materials.

[0120] The passing hole 32 of the sleeve 1 changes in a way that gradually changes from a large inner diameter at the pier wall 61 to a small inner diameter at the inner end. The outer extension section at the port is a straight section t, as Figure 15 shown. The slope rate of the rod diameter change of the built-in passing section 22 is the same as the slope rate of the inner diameter change of the passing hole 32. To realize the connection work of the connection section 24, after the compression spring at the outer end is compressed, the connecting rod 2 moves into the sleeve 1. Assuming that the spring length x is completely compressed, the diameter dx of the connecting rod 2 at the inner end extrusion surface of the sleeve 1 after compression and the dimensions of the connecting rod 2 and the sleeve 1 need to satisfy the following relationship:

[0121]

[0122] That is, the slope rate of the size change of the passing section 22 needs to be consistent with the slope rate of the inner wall of the passing hole 32 of the sleeve 1. After the dimensions of the connecting rod 2 meet the force conditions, the length x value of the spring can be adjusted to meet the requirement of consistent slope rate.

[0123]

[0124] From this, it can be determined that the thickness h1 of the polytetrafluoroethylene plate 5 needs to satisfy the requirement of h1 ≤ D1 - dx.

[0125] Where: Db is the inner diameter of the through hole 3 of the sleeve 1 with a port; Da is the inner diameter of the inner step 33 of the hole in the sleeve 1; da is the inner diameter of the limiting step 23; db is the diameter of the outer end of the connecting section 24; L is the length of the cross-sectional change of the through hole 32; x is the length of the spring; a is the axial length of the limiting hole 31; dx is the diameter of the connecting rod 2 at the extrusion surface of the inner step 33 after the extrusion connecting rod 2 moves a distance x; the meanings of the other parameters are the same as those in Formula 1 and Formula 2. Theoretically, there is a certain length left after the spring is compressed, that is, the moving length of the connecting rod 2 into the sleeve 1 is less than x, and the actual dx value at the extrusion surface of the sleeve 1 is less than the calculated value of the above formula. This difference is used as the required moving space between the connecting rod 2 and the sleeve 1, that is, there is a certain gap between the through section 22 and the polytetrafluoroethylene plate 5, which is the above difference and is the reserved space.

[0126] When used to design the built-in bridge accessory connection pre-embedded part structure in the above-mentioned Embodiment 4, and at least two of the inner steps 33 are provided in the through hole 3, the inner diameters of all the inner steps 33 gradually decrease from inside to outside along the axis of the through hole 3, and the connecting rod 2 is provided with the limiting steps 23 corresponding to each of the inner steps 33; and the distance between two adjacent inner steps 33 and the distance between the corresponding adjacent limiting steps 23 are in the relationship a. The inner steps 33 and the limiting steps 23 are both rotating bodies. The inner steps 33 along the axis of the through hole 3 from inside to outside are the first inner step, the second inner step,..., the i-th inner step in sequence, and the limiting steps 23 along the connecting rod 2 from inside to outside are the first limiting step, the second limiting step,..., the i-th limiting step in sequence, where i is greater than or equal to 2 and i is an integer; then the inner diameter of the first inner step, the outer diameter of the first limiting step, the thickness of the outer diameter of the first limiting step, the inner diameter of the i-th inner step, the outer diameter of the i-th limiting step, and the thickness of the outer diameter of the i-th limiting step are adjusted by Formula 3 and Formula 4. The Formula 3 is:

[0127]

[0128] The Formula 4 is:

[0129]

[0130] Such as Figure 18As shown, in Formula 3 and Formula 4, N is the tensile force acting on the connecting rod 2 along the axial direction of the through hole 3 and outward; r is the outer diameter of the first limiting step; D is the inner diameter of the inner hole step 33; h is the thickness of the outer diameter of the first limiting step; di is the outer diameter of the i-th limiting step; Di is the inner diameter of the i-th inner hole step; si is the thickness of the outer diameter of the i-th limiting step; σ is the total compressive stress of the connecting rod 2 at all the inner hole steps 33 and the corresponding limiting step 23; τ is the total shear stress of the connecting rod 2 at all the inner hole steps 33 and the corresponding limiting step 23; g [σ t is the allowable compressive stress of the material of the connecting rod 2; [σ g is the allowable compressive stress of the material of the sleeve 1; [τ

[0131] As Figure 17 and Figure 18 shown, in the first load-bearing section 212 and the second load-bearing section 211 form the first limiting step on the left. The outer diameter of the first limiting step is the diameter r of the first load-bearing section 212, and the inner diameter of the first limiting step is the diameter d2 of the second load-bearing section 211. And the second load-bearing section 211 and the through-section 22 on the right form the second limiting step on the right. The outer diameter of the second limiting step is the diameter d2 of the second load-bearing section 211, and the inner diameter of the second limiting step is the diameter d3 of the through-section 22 on the right. The thickness h of the outer diameter of the first limiting step is the axial length of the first load-bearing section 212, and the thickness of the outer diameter of the second limiting step is the axial length s2 of the second load-bearing section 211. By analogy, it can be known that the inner diameter of the left limiting step 23 is the outer diameter of the adjacent right limiting step 23. Similarly, it can be known that the inner diameter of the left inner hole step 33 is the outer diameter of the adjacent right inner hole step 33. Under the condition of meeting the force requirements, by adjusting each Di, di, si, the dimensional requirements of r and h are optimized.

[0132] When used for designing the built-in bridge accessory connecting pre-embedded part structure in the above-mentioned Embodiment 4, and at least two inner steps 33 are provided in the through hole 3, the inner diameters of all the inner steps 33 gradually decrease from the inside to the outside along the axial direction of the through hole 3, and the connecting rod 2 is provided with the limiting steps 23 corresponding to each inner step 33; and the distance between two adjacent inner steps 33 and the distance between the corresponding adjacent two limiting steps 23 are in the relationship b, both the inner step 33 and the limiting step 23 are of rotary bodies, the inner steps 33 from the inside to the outside along the axial direction of the through hole 3 are the first inner step, the second inner step, ……, the i-th inner step in sequence, and the limiting steps 23 from the inside to the outside along the connecting rod 2 are the first limiting step, the second limiting step, ……, the i-th limiting step in sequence, i is greater than or equal to 2 and i is an integer; then the inner diameter of the first inner step, the outer diameter of the first limiting step, the thickness existing in the outer diameter of the first limiting step, the inner diameter of the i-th inner step, the outer diameter of the i-th limiting step, and the thickness existing in the outer diameter of the i-th limiting step are adjusted through Formula Five and Formula Six, and the Formula Five is:

[0133] (di 2 -Di 2 )>(r 2 -D 2 )

[0134] The Formula Six is:

[0135] (Di×si)>(D×h)

[0136] As Figure 21 shown, in Formula Five and Formula Six, r is the outer diameter of the first limiting step; D is the inner diameter of the inner step 33; h is the thickness existing in the outer diameter of the first limiting step; di is the outer diameter of the i-th limiting step; Di is the inner diameter of the i-th inner step; si is the thickness existing in the outer diameter of the i-th limiting step. Also as described above, the inner diameter of the left limiting step 23 is the outer diameter of the adjacent right limiting step 23, and the inner diameter of the left inner step 33 is the outer diameter of the adjacent right inner step 33. Among them, the outer diameter of the limiting step 23 refers to the larger diameter of the corresponding sudden change diameter part of the connecting rod 2 at the limiting step 23, the inner diameter of the limiting step 23 refers to the smaller diameter of the corresponding sudden change diameter part of the connecting rod 2 at the limiting step 23, and the thickness existing in the outer diameter of the limiting step 23 is the axial length of the larger diameter of the corresponding sudden change diameter part of the connecting rod 2 at the limiting step 23.

[0137] By adopting the above design method of the built-in bridge accessory connecting pre-embedded part structure, the corresponding dimensions of the sleeve 1 and the connecting rod 2 can be adjusted more accurately and quickly.

[0138] Embodiment 6

[0139] This embodiment provides a pre-embedded component, asFigure 22 As shown, it includes at least two of the above-mentioned built-in bridge accessory connection pre-embedded parts structures. The inner ends of the sleeves 1 are all connected by connecting steel bars 11, and the connecting steel bars 11 are connected to the pier body steel bars 62 of the pier body 6. When the sleeves 1 are pre-embedded, according to the connection setting of the inspection platform support, multiple sleeves 1 can be connected at the inner ends by connecting steel bars 11 to form a pre-embedded assembly and be pre-embedded together. And during pre-embedding, they are connected to the pier body steel bars 62 through the connecting steel bars 11 to increase the integrity of the sleeves 1 and improve the safety of the connection.

[0140] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A built-in bridge auxiliary connection embedded part structure, characterized in that: It comprises a sleeve (1) and a connecting rod (2) disposed inside the sleeve (1), the sleeve (1) being used to be embedded in the pier body (6), the outer end of the sleeve (1) being used to be flush with the inner wall of the template of the pier body (6), the sleeve (1) having a through hole (3) extending along its axial direction, the inner end of the through hole (3) being closed, the connecting rod (2) being disposed in the through hole (3), the outer end of the connecting rod (2) being aligned with the outer end of the through hole (3) or being located inside the outer end of the through hole (3), the connecting rod (2) being able to move axially along the through hole (3), the outer end of the connecting rod (2) being able to be pulled out or ejected from the outer end of the through hole (3), and the outer end of the connecting rod (2) being used to connect to an auxiliary structure of the bridge; An inner hole step (33) is provided on the inner side of the inner end of the through hole (3) and faces inward along the axial direction of the through hole (3); a limiting step (23) is provided on the outer side of the inner end of the connecting rod (2) and faces outward along the axial direction of the through hole (3); when the outer end of the connecting rod (2) is capable of connecting to the bridge auxiliary structure, the inner hole step (33) is capable of limiting the movement of the limiting step (23) toward the outer end of the through hole (3).

2. The internal bridge auxiliary connection embedded part structure according to claim 1 is characterized in that: At least two in-hole steps (33) are provided in the through hole (3); the inner diameters of all the in-hole steps (33) gradually decrease from the inside to the outside along the axial direction of the through hole (3); the connecting rod (2) is provided with a limiting step (23) corresponding to each in-hole step (33); the spacing between two adjacent in-hole steps (33) and the spacing between two corresponding adjacent limiting steps (23) have a relationship a or a relationship b: Relationship a: the distance between two adjacent in-hole steps (33) is equal to the distance between two corresponding adjacent limiting steps (23); Relationship b: the spacing between two adjacent in-hole steps (33) is not equal to the spacing between two corresponding adjacent limiting steps (23).

3. The internal bridge auxiliary connection embedded part structure according to claim 1 is characterized in that: The inner step (33) at the outermost end of the through hole (3) is adjacent to a through hole (32) outwardly. The diameter of the penetration hole (32) gradually increases from the inside to the outside along its axial direction, the limiting step (23) at the outermost end of the connecting rod (2) is adjacent to the penetration section (22) outwardly, and the outer wall of the penetration section (22) and the inner wall of the penetration hole (32) are adapted to be arranged.

4. The internal bridge auxiliary connection embedded part structure according to claim 3 is characterized in that: The outer end of the penetration section (22) has a connecting section (24), and the connecting section (24) is used to connect the bridge auxiliary structure. The outer end of the penetration hole (32) has an outer end hole (34), and the connecting section (24) is arranged in the outer end hole (34). The diameter of the outer end of the outer end hole (34) is equal to the diameter of the inner end of the outer end hole (34).

5. The internal bridge auxiliary connection embedded component structure according to any one of claims 1 to 4, characterized in that: The inner end of the through hole (3) is connected to an elastic body (4) arranged along its axial direction, and the outer end of the elastic body (4) is arranged close to the inner end of the connecting rod (2). Under the outward elastic force of the elastic body (4), the outer end of the connecting rod (2) can pop out from the outer end of the through hole (3).

6. The internal bridge auxiliary connection embedded part structure according to claim 5 is characterized in that: The outer end of the elastic body (4) is connected to the inner end of the connecting rod (2).

7. The internal bridge auxiliary connection embedded component structure according to any one of claims 1 to 4, characterized in that: The inner hole step (33) at the outermost end of the through hole (3) is outwardly adjacent to a through hole (32), and at least one layer of polytetrafluoroethylene plate (5) is arranged inside the through hole (32).

8. A design method for a built-in bridge auxiliary connection embedded part structure, characterized in that: Including the following three situations: The first type is to design a built-in bridge accessory connection embedded component structure as described in claim 1, and the built-in bridge accessory connection embedded component structure has an in-hole step (33) and a limiting step (23), and the in-hole step (33) and the limiting step (23) are both rotating bodies, and the inner diameter of the in-hole step (33), the outer diameter of the limiting step (23) and the thickness of the outer diameter of the limiting step (23) are adjusted by formulas 1 and 2, and the formula 1 is: ； The formula 2 is: ； In the formula 1 and the formula 2, N is the axial outward pulling force that the connecting rod (2) needs to withstand along the through hole (3); r is the outer diameter of the limiting step (23); D is the inner diameter of the step (33) in the hole; and h is the thickness of the outer diameter of the limiting step (23); is the allowable compressive stress of the material of the connecting rod (2); is the allowable compressive stress of the material of the sleeve (1); is the allowable shear stress of the material of the connecting rod (2); The second type is to design the built-in bridge auxiliary connection embedded part structure as described in claim 2, and the spacing between two adjacent in-hole steps (33) and the spacing between two corresponding adjacent limit steps (23) are in relationship a, the in-hole steps (33) and the limit steps (23) are both rotating bodies, and the in-hole steps (33) from the inside to the outside along the axial direction of the through hole (3) are successively the first in-hole step, the second in-hole step, ..., the i-th in-hole step, and the limit steps (23) from the inside to the outside along the connecting rod (2) are successively the first limit step, the second limit step, ..., the i-th limit step, i is greater than or equal to 2, and i is an integer; then the inner diameter of the first in-hole step, the outer diameter of the first limit step, the thickness of the outer diameter of the first limit step, the inner diameter of the i-th in-hole step, the outer diameter of the i-th limit step, and the thickness of the outer diameter of the i-th limit step are adjusted by formula three and formula four, and the formula three is: ； The formula 4 is: ； In the formula 3 and the formula 4, N is the axial outward pulling force that the connecting rod (2) needs to withstand along the through hole (3); r is the outer diameter of the first limiting step; D is the inner diameter of the step (33) in the hole; h is the thickness of the outer diameter of the first limiting step; di is the outer diameter of the i-th limiting step; Di is the inner diameter of the i-th step in the hole; is the thickness of the outer diameter of the i-th limiting step; is the allowable compressive stress of the material of the connecting rod (2); is the allowable compressive stress of the material of the sleeve (1); is the allowable shear stress of the material of the connecting rod (2); The third type is to design the built-in bridge auxiliary connection embedded part structure as described in claim 2, and the spacing between two adjacent in-hole steps (33) and the spacing between two corresponding adjacent limit steps (23) are in relationship b, the in-hole steps (33) and the limit steps (23) are both rotating bodies, and the in-hole steps (33) from the inside to the outside along the axial direction of the through hole (3) are successively the first in-hole step, the second in-hole step, ..., the i-th in-hole step, and the limit steps (23) from the inside to the outside along the connecting rod (2) are successively the first limit step, the second limit step, ..., the i-th limit step, i is greater than or equal to 2, and i is an integer; then the inner diameter of the first in-hole step, the outer diameter of the first limit step, the thickness of the outer diameter of the first limit step, the inner diameter of the i-th in-hole step, the outer diameter of the i-th limit step, and the thickness of the outer diameter of the i-th limit step are adjusted by formulas 5 and 6, and the formula 5 is: ； The formula six is: ； In the formula 5 and the formula 6, r is the outer diameter of the first limiting step; D is the inner diameter of the step (33) in the hole; h is the thickness of the outer diameter of the first limiting step; di is the outer diameter of the i-th limiting step; Di is the inner diameter of the i-th step in the hole; is the thickness of the outer diameter of the i-th limiting step.

9. A pre-embedded component, characterized in that: It comprises at least two built-in bridge auxiliary connection embedded parts structures as described in any one of claims 1 to 7, wherein the inner ends of the sleeves (1) are connected by connecting steel bars (11), and the connecting steel bars (11) are connected to the pier body steel bars (62) of the pier body (6).

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