An auxiliary structure for bridge pier column maintenance

Abstract

The utility model relates to a pier maintenance technical field especially relates to a kind of auxiliary structure for bridge pier maintenance, it includes: water absorption layer, water absorption layer is set in pier column surface;Water pipe, water pipe is wound and set on water absorption layer, to water absorption layer water seepage;Air bag, air bag is sleeved in pier column surface, and water absorption layer and water pipe are located between air bag and pier column;Air release valve and air inlet, air release valve and air inlet are connected with air bag respectively.The air bag can be set on pier column by integral hoisting, avoid the climbing operation of construction personnel for wrapping coverage, fundamentally reduce the risk of aerial work, and greatly reduce labor intensity.The air bag after inflation can be tightly wrapped in the outside of pier column, form a closed maintenance cavity, effectively prevent moisture evaporation, also can play the role of heat insulation, slow down the thermal stress of concrete due to the dramatic change of external temperature, inhibit the risk of cracking.

Description

Technical Field

[0001] This utility model relates to the field of bridge pier maintenance technology, and in particular to an auxiliary structure for bridge pier maintenance. Background Technology

[0002] As a crucial load-bearing component in bridge engineering, the pier plays a vital role in transferring the load from the superstructure. The curing process after concrete pouring directly affects the final strength, durability, and crack resistance of the structure. Therefore, ensuring the quality of curing is of paramount importance for guaranteeing the long-term service performance of the pier.

[0003] Traditional construction often employs a curing method combining plastic film wrapping and drip irrigation. The specific process involves: after demolding, wrapping the entire surface of the pier column with plastic film using a spiral winding or vertical laying method to form a sealed, moisture-retaining layer; subsequently, a drip irrigation system is installed at the top of the column, and the water pressure is adjusted to ensure even water distribution from the drip tape, maintaining the concrete surface moisture. According to specifications, the curing time for conventional concrete should be no less than 7 days, and for important structures or concrete containing admixtures, it should be extended to more than 14 days, until the design strength is reached before curing can be terminated.

[0004] However, this traditional method has significant limitations in practical applications. On the one hand, the work requires workers to climb the piers to wrap the film, which is not only labor-intensive but also carries high safety risks. On the other hand, the plastic film has poor wind resistance in open-air environments, making it prone to damage and loosening, resulting in incomplete coverage and difficulty in maintaining stable humidity and temperature conditions. Furthermore, the plastic film is difficult to recycle, which is detrimental to green construction and resource conservation. Utility Model Content

[0005] The purpose of this invention is to provide an auxiliary structure for the maintenance of bridge piers, in order to solve the problem of plastic film wrapping in the prior art.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An auxiliary structure for bridge pier maintenance includes: a water-absorbing layer disposed on the surface of the pier; a seepage pipe wound around the water-absorbing layer to allow water to seep into it; an airbag fitted onto the surface of the pier, with the water-absorbing layer and the seepage pipe located between the airbag and the pier; and a vent valve and an air inlet, the vent valve and the air inlet respectively connected to the airbag.

[0007] Using the aforementioned technical methods, the airbag can be hoisted and fitted onto the pier as a whole, eliminating the need for construction workers to climb to cover it, fundamentally reducing the risks of working at heights and significantly reducing labor intensity. The inflated airbag tightly wraps around the outside of the pier, forming a sealed curing cavity that effectively prevents moisture evaporation, provides insulation, and reduces thermal stress on the concrete caused by drastic temperature changes, thus inhibiting the risk of cracking.

[0008] In this invention, water is continuously and slowly supplied to the absorbent layer through a seepage pipe. The absorbent layer, as a water storage medium, can evenly distribute water on the entire surface of the pier column and use its capillary action to keep the concrete moist for a long time.

[0009] Furthermore, the airbag includes an airbag body and a protective sleeve, the airbag body being in close contact with the drainage pipe; the protective sleeve is fixed to the outside of the airbag body.

[0010] Based on the aforementioned technical means, the airbag body, after inflation, is evenly and tightly pressed onto the absorbent layer and the drainage pipe, forming a reliable sealed environment. The protective sleeve protects against external factors such as ultraviolet radiation, temperature changes, mechanical scratches, and impacts, significantly slowing down the aging rate of the materials and thus extending the service life of the entire airbag.

[0011] Furthermore, the vent valve includes a connecting pipe, an outlet pipe, a first cavity, and a top plug. The connecting pipe and the outlet pipe are respectively connected to the first cavity, and the connecting pipe is connected to the airbag body. The top plug is installed in the first cavity and can be close to or away from the outlet pipe to close or open the outlet pipe.

[0012] Based on the above-mentioned technical means, this utility model can precisely control the opening and closing and degree of the air outlet pipe by the linear movement of the top plug in the first cavity.

[0013] Furthermore, the vent valve also includes a first spring, which is installed in the first cavity and abuts against the top plug to press the top plug against the vent pipe.

[0014] According to the aforementioned technical means, the first spring, through its preload, continuously presses the top plug against the sealed position of the air outlet pipe. When an operational error occurs, such as over-inflation by an operator or failure to disconnect the inflation device in time due to carelessness, causing the internal pressure of the airbag to exceed the set safety value, the gas pressure will overcome the preload of the first spring, pushing the top plug downwards and automatically opening the air outlet pipe. The overpressurized gas is then quickly discharged through this outlet pipe, and the internal pressure of the airbag decreases accordingly. Once the pressure returns to the normal value, the elastic force of the first spring will push the top plug to automatically reset, resealing the air outlet pipe and stopping the leakage.

[0015] Furthermore, the vent valve also includes a threshold adjustment element, which is movably installed in the first cavity and at least partially extends out of the first cavity; the threshold adjustment element is connected to the first spring, and when the threshold adjustment element moves, it can adjust the compression of the first spring.

[0016] According to the above-mentioned technical means, by moving the threshold adjustment component to change the pre-compression of the first spring, the opening pressure setting value of the vent valve can be directly adjusted.

[0017] Furthermore, the vent valve also includes a guide member, one end of which is fixed to the threshold adjustment member, and the other end is movably connected to the top plug, and the first spring is sleeved outside the guide member; the top plug is capable of moving along the extension and retraction direction of the first spring at the end of the guide member.

[0018] Based on the aforementioned technical means, the guide provides precise linear guidance for the compression and rebound of the first spring and the movement of the top plug.

[0019] Furthermore, the air intake includes a tube body, a connecting nozzle, and a valve pin. The connecting nozzle is inserted into the tube body, and the tube body is connected to the airbag body. The connecting nozzle is used to connect to the air pump. The valve pin is movably installed in the connecting nozzle and is used to open or close the connecting nozzle.

[0020] Based on the aforementioned technical means, the valve ejector pin can move under the action of the air pump to open the channel of the connecting nozzle. When inflation is complete and the air pump is disconnected, the valve ejector pin can move in the opposite direction to close the channel of the connecting nozzle, thus forming a highly efficient one-way valve structure.

[0021] Furthermore, a sealing block is formed on the connecting nozzle, and a first limiting block is formed on the valve ejector pin; when the valve ejector pin moves, the first limiting block can move closer to or further away from the sealing block to close or open the connecting nozzle.

[0022] According to the above-mentioned technical means, the airflow channel can be reliably shut off by the tight fit between the first limiting block and the sealing block.

[0023] Furthermore, the intake nozzle also includes a second spring, and a second limiting block is formed on the valve ejector pin. The second spring is sleeved on the valve ejector pin and located between the sealing block and the second limiting block. When the first limiting block moves away from the sealing block, the second spring is compressed so that the first limiting block tends to move closer to the sealing block.

[0024] According to the above technical means, when the inflation process ends and the external air pump is disconnected, the elastic potential energy stored in the second spring will be released immediately, driving the valve pin and the first limiting block on it to quickly return to their original position and press against the sealing block, thereby achieving instantaneous automatic sealing.

[0025] At the moment of inflation connection, the air pump connector pushes the valve pin to open against the elastic force of the second spring. The second spring acts as a buffer, avoiding direct damage to components such as the sealing block from the hard impact.

[0026] Furthermore, the protective sleeve has a constricted opening, which is used to fit over the top of the pier column.

[0027] Using the aforementioned technical means, the upper end of the protective sleeve is securely installed on the pier to prevent the airbag from sliding down.

[0028] The beneficial effects achieved by this utility model are: In this invention, the airbag can be hoisted and fitted onto the pier as a whole, eliminating the need for construction workers to climb to cover it, fundamentally reducing the risks of working at heights and significantly reducing labor intensity. The inflated airbag tightly wraps around the outside of the pier, forming a sealed curing cavity that effectively prevents moisture evaporation, provides insulation, and reduces thermal stress on the concrete caused by drastic temperature changes, thus inhibiting the risk of cracking.

[0029] In this invention, water is continuously and slowly supplied to the absorbent layer through a seepage pipe. The absorbent layer, as a water storage medium, can evenly distribute water on the entire surface of the pier column and use its capillary action to keep the concrete moist for a long time. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a top view of the structure of this utility model; Figure 3 This is a schematic diagram of the opening structure of the vent valve of this utility model; Figure 4 This is a schematic diagram of the vent valve closing structure of this utility model; Figure 5 This is a schematic diagram of the air inlet structure of this utility model; Figure 6 This is a schematic diagram of the application structure of this utility model.

[0031] Among them, 1. Water-absorbing layer; 2. Piers; 3. Drainage pipe; 31. Drainage hole; 32. Drip irrigation inlet; 4. Airbag; 41. Airbag body; 42. Protective cover; 421. Closure; 5. Vent valve; 51. Connecting pipe; 52. Vent pipe; 53. First cavity; 54. Top plug; 55. First spring; 56. Threshold adjustment component; 57. Guide component; 6. Air inlet; 61. Pipe body; 62. Connecting nozzle; 63. Valve pin; 64. Sealing block; 65. First limiting block; 66. Second spring; 67. Second limiting block.

[0032] The accompanying drawings are for illustrative purposes only and should not be construed as limiting this patent. To better illustrate this utility model, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual product dimensions. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings. The same or similar reference numerals correspond to the same or similar components. The terms describing positional relationships in the drawings are for illustrative purposes only and should not be construed as limiting this patent. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and technical features in the embodiments of this application can be combined with each other, and the detailed descriptions in the specific embodiments should be understood as explanations of the purpose of this application and should not be regarded as undue limitations on this application.

[0034] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the specific technical solutions of this application will be further described in detail below with reference to the accompanying drawings of the embodiments of this application. The following embodiments are used to illustrate this application, but are not intended to limit the scope of this application.

[0035] In the embodiments of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this application, unless otherwise stated, "multiple" means two or more.

[0036] In the embodiments of this application, unless otherwise explicitly specified and limited, the term "connection" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a direct connection or an indirect connection through an intermediate medium.

[0037] In embodiments of this application, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0038] The technical solution of this embodiment will be described in detail below with reference to the accompanying drawings.

[0039] like Figure 1 As shown, an auxiliary structure for bridge pier maintenance includes: a water-absorbing layer 1, which is disposed on the surface of the pier 2; a seepage pipe 3, which is wound around the water-absorbing layer 1 to allow water to seep into the water-absorbing layer 1; and an airbag 4, which is sleeved on the surface of the pier 2, with the water-absorbing layer 1 and the seepage pipe 3 located between the airbag 4 and the pier 2. Figure 6 As shown, the vent valve 5 and the air inlet 6 are connected to the airbag 4.

[0040] The airbag 4 can be hoisted and installed on the pier 2 as a whole, eliminating the need for construction workers to climb to cover it, fundamentally reducing the risks of working at heights and significantly reducing labor intensity. Once inflated, the airbag 4 tightly wraps around the outside of the pier 2, forming a sealed curing cavity that effectively prevents moisture evaporation, provides insulation, reduces thermal stress on the concrete caused by drastic temperature changes, and inhibits the risk of cracking.

[0041] In this embodiment, water is continuously and slowly supplied to the absorbent layer 1 through the seepage pipe 3. The absorbent layer 1, as a water storage medium, can evenly distribute water on the entire surface of the pier column 2 and use its capillary action to keep the concrete moist for a long time.

[0042] The absorbent layer 1 is made of absorbent geomaterials, such as geotextile or polymer water-retaining sponge. In this embodiment, the geotextile, as the absorbent layer 1, can quickly absorb water from the seepage pipe 3 and use the capillary action between the fibers to evenly diffuse the water to the entire contact surface, avoiding localized over-wetting or dryness.

[0043] In this embodiment, as Figure 1 As shown, multiple seepage holes 31 are formed on the seepage pipe 3. The multiple seepage holes 31 are distributed at equal intervals to ensure that a uniform water supply point is formed in the entire surface area of ​​the pier 2.

[0044] Preferably, the drip irrigation port 32 of the seepage pipe 3 is located at the top of the pier 2, and the water flows naturally downward under the action of gravity and is distributed to the entire seepage pipe 3 that surrounds the pier 2.

[0045] The specific operation process for pier maintenance using this structure is as follows: After the concrete formwork of pier 2 is removed and the surface is cleaned, the sheet-like or cylindrical absorbent layer 1 is tightly attached to the surface of pier 2. Then, the seepage pipe 3 is spirally wound around the absorbent layer 1. Finally, the airbag 4 is fitted onto the outside of pier 2, where the absorbent layer 1 and seepage pipe 3 have been installed, to initially fix its position.

[0046] Compressed air is injected into the airbag 4 through the air inlet 6, causing it to expand and press evenly against the water-absorbing layer 1, forming a sealed space. At the same time, the water supply valve is opened, and water slowly seeps out through the seepage pipe 3 and is absorbed by the water-absorbing layer 1.

[0047] Once the concrete strength of the pier column reaches the design requirements and the curing period is over, first shut off the water supply, then release the gas from the airbag 4 through the air release valve 5. After the airbag 4 has contracted, remove it, the seepage pipe 3, and the absorbent layer 1 from the pier column 2 in sequence.

[0048] like Figure 1 and Figure 2 As shown, the airbag 4 includes an airbag body 41 and a protective sleeve 42. The airbag body 41 is in close contact with the drainage pipe 3; the protective sleeve 42 is fixed to the outside of the airbag body 41.

[0049] The airbag body 41 is used to evenly and tightly press against the absorbent layer 1 and the drainage pipe 3 after inflation, forming a reliable sealed environment. The protective sleeve 42 is used to resist external factors such as ultraviolet radiation, temperature changes, mechanical scratches and impacts, which significantly slows down the aging rate of the materials, thereby extending the service life of the entire airbag.

[0050] In this embodiment, the protective sleeve 42 is made of nylon woven fabric, which can effectively prevent the airbag body from being directly punctured by sharp objects.

[0051] like Figure 3 and Figure 4 As shown, the vent valve 5 includes a connecting pipe 51, an air outlet pipe 52, a first cavity 53, and a top plug 54. The connecting pipe 51 and the air outlet pipe 52 are respectively connected to the first cavity 53, and the connecting pipe 51 is connected to the airbag body 41. The top plug 54 is installed in the first cavity 53 and can be close to or away from the air outlet pipe 52 to close or open the air outlet pipe 52.

[0052] This embodiment can precisely control the opening and closing of the vent pipe 52 and its degree of opening by the linear movement of the top plug 54 within the first cavity 53.

[0053] like Figure 3 and Figure 4 As shown, the vent valve 5 also includes a first spring 55, which is installed in the first cavity 53. The first spring 55 abuts against the top plug 54 to press the top plug 54 against the vent pipe 52.

[0054] The first spring 55, through its preload, continuously presses the top plug 54 against the sealed position of the air outlet pipe 52. In the event of an operational error, such as over-inflation by the worker or failure to disconnect the inflation device in time due to carelessness, causing the internal pressure of the airbag 4 to exceed the set safety value, the gas pressure will overcome the preload of the first spring 55, pushing the top plug 54 downwards (e.g., ...). Figure 3 As shown), this automatically opens the air outlet 52. Overpressurized gas is rapidly discharged through the air outlet 52, causing the pressure inside the airbag 4 to decrease. Once the pressure returns to its normal value, the elastic force of the first spring 55 will push the top plug 54 to automatically reset (as shown). Figure 4 As shown), reseal the vent pipe 52 to stop the leakage.

[0055] like Figure 3 and Figure 4 As shown, the vent valve 5 also includes a threshold adjustment member 56, which is movably installed in the first cavity 53 and at least part of the threshold adjustment member 56 extends out of the first cavity 53; the threshold adjustment member 56 is connected to the first spring 55, and when the threshold adjustment member 56 moves, it can adjust the compression of the first spring 55.

[0056] By moving the threshold adjustment component 56 to change the pre-compression of the first spring 55, the opening pressure setting of the vent valve 5 can be directly adjusted.

[0057] It should be noted that the pressure setting value of the vent valve 5 is an empirical value. This value is determined based on a comprehensive consideration of multiple factors. Its purpose is to provide the system with a safe, effective, and easily implementable working pressure range in the field, rather than an absolutely precise value that requires complex calculations. This "empirical value" can be ultimately determined and verified through simple and reliable field methods. For example, during initial use, the operator can start inflating at a lower pressure until the airbag is observed to be fully inflated and in uniform contact with the pier surface, without any obvious localized marks. This pressure can then be used as a baseline setting value.

[0058] In this embodiment, a threaded hole is formed on the vent valve 5, and the threaded hole is connected to the first cavity 53. A screw is formed on the end of the threshold adjustment member 56 extending out of the first cavity 53. Through the threaded engagement of the screw and the threaded hole, the compression of the first spring 55 can be adjusted by screwing.

[0059] like Figure 3 and Figure 4As shown, the vent valve 5 also includes a guide 57, one end of which is fixed on the threshold adjustment member 56, and the other end is movably connected to the top plug 54. The first spring 55 is sleeved on the outside of the guide 57. The top plug 54 can move along the extension and retraction direction of the first spring 55 at the end of the guide 57.

[0060] The guide 57 provides precise linear guidance for the compression and rebound of the first spring 55 and the movement of the top plug 54.

[0061] like Figure 5 As shown, the air intake nozzle 6 includes a tube body 61, a connecting nozzle 62, and a valve pin 63. The connecting nozzle 62 is inserted into the tube body 61, and the tube body 61 is connected to the airbag body 41. The connecting nozzle 62 is used to connect to the air pump. The valve pin 63 is movably installed in the connecting nozzle 62 and is used to open or close the connecting nozzle 62.

[0062] The valve ejector pin 63 can move under the action of the air pump to open the channel of the connector 62. When inflation is complete and the air pump is disconnected, the valve ejector pin 63 can move in the opposite direction to close the channel of the connector 62, thus forming a highly efficient one-way valve structure.

[0063] like Figure 5 As shown, a sealing block 64 is formed on the connecting nozzle 62, and a first limiting block 65 is formed on the valve ejector pin 63; when the valve ejector pin 63 moves, the first limiting block 65 can move closer to or further away from the sealing block 64 to close or open the connecting nozzle 62.

[0064] The tight fit between the first limiting block 65 and the sealing block 64 enables reliable shut-off of the airflow channel.

[0065] like Figure 5 As shown, the intake nozzle 6 also includes a second spring 66, and a second limiting block 67 is formed on the valve pin 63. The second spring 66 is sleeved on the valve pin 63 and is located between the sealing block 64 and the second limiting block 67. When the first limiting block 65 moves away from the sealing block 64, the second spring 66 is compressed so that the first limiting block 65 tends to move closer to the sealing block 64.

[0066] When the inflation process ends and the external air pump is disconnected, the elastic potential energy stored in the second spring 66 will be released immediately, driving the valve pin 63 and the first limiting block 65 on it to quickly return to their original position and press against the sealing block 64, thus achieving instantaneous automatic sealing.

[0067] At the moment of inflation connection, the air pump connector pushes the valve pin 63 to open against the elastic force of the second spring 66. The second spring 66 plays a buffering role, avoiding direct damage to components such as the sealing block 64 by hard impact.

[0068] like Figure 1As shown, the protective sleeve 42 has a constriction 421, which is used to fit onto the top of the pier column 2.

[0069] The closing section 421 securely installs the upper end of the protective sleeve 42 onto the pier 2 to prevent the airbag 4 from sliding down.

[0070] The sequence numbers of the embodiments in this application are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments. The above are merely preferred embodiments of this application and do not limit the patent scope of this application. Any equivalent structural or procedural transformations made based on the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. An auxiliary structure for the maintenance of bridge piers, characterized in that, include: A water-absorbing layer (1) is provided on the surface of the pier (2); A seepage pipe (3) is wound around the absorbent layer (1) to allow water to seep into the absorbent layer (1); An airbag (4) is fitted onto the surface of the pier (2), and the water-absorbing layer (1) and the seepage pipe (3) are located between the airbag (4) and the pier (2). The air vent valve (5) and the air inlet (6) are respectively connected to the airbag (4).

2. The auxiliary structure for bridge pier maintenance according to claim 1, characterized in that, The airbag (4) includes an airbag body (41) and a protective sleeve (42). The airbag body (41) is in close contact with the drainage pipe (3). The protective sleeve (42) is fixed on the outside of the airbag body (41).

3. The auxiliary structure for bridge pier maintenance according to claim 2, characterized in that, The vent valve (5) includes a connecting pipe (51), an air outlet pipe (52), a first cavity (53), and a top plug (54). The connecting pipe (51) and the air outlet pipe (52) are respectively connected to the first cavity (53), and the connecting pipe (51) is connected to the airbag body (41). The top plug (54) is installed in the first cavity (53) and can be close to or away from the air outlet pipe (52) to close or open the air outlet pipe (52).

4. The auxiliary structure for bridge pier maintenance according to claim 3, characterized in that, The vent valve (5) also includes a first spring (55), which is installed in the first cavity (53). The first spring (55) abuts against the top plug (54) to press the top plug (54) against the vent pipe (52).

5. An auxiliary structure for bridge pier maintenance according to claim 4, characterized in that, The vent valve (5) further includes a threshold adjustment member (56), which is movably installed in the first cavity (53) and at least part of the threshold adjustment member (56) extends out of the first cavity (53); the threshold adjustment member (56) is connected to the first spring (55), and when the threshold adjustment member (56) moves, it can adjust the compression of the first spring (55).

6. An auxiliary structure for bridge pier maintenance according to claim 5, characterized in that, The vent valve (5) also includes a guide (57), one end of which is fixed on the threshold adjustment member (56), and the other end is movably connected to the top plug (54), and the first spring (55) is sleeved on the guide (57); the top plug (54) can move along the extension and retraction direction of the first spring (55) at the end of the guide (57).

7. An auxiliary structure for bridge pier maintenance according to claim 2, characterized in that, The air intake nozzle (6) includes a tube body (61), a connecting nozzle (62), and a valve pin (63). The connecting nozzle (62) is inserted into the tube body (61), and the tube body (61) is connected to the airbag body (41). The connecting nozzle (62) is used to connect to the air pump. The valve pin (63) is movably installed in the connecting nozzle (62) and is used to open or close the connecting nozzle (62).

8. An auxiliary structure for bridge pier maintenance according to claim 7, characterized in that, A sealing block (64) is formed on the connecting nozzle (62), and a first limiting block (65) is formed on the valve ejector pin (63); when the valve ejector pin (63) moves, the first limiting block (65) can move closer to or further away from the sealing block (64) to close or open the connecting nozzle (62).

9. An auxiliary structure for bridge pier maintenance according to claim 8, characterized in that, The air intake (6) also includes a second spring (66), and a second limiting block (67) is formed on the valve pin (63). The second spring (66) is sleeved on the valve pin (63) and located between the sealing block (64) and the second limiting block (67). When the first limiting block (65) moves away from the sealing block (64), the second spring (66) is compressed so that the first limiting block (65) tends to move closer to the sealing block (64).

10. An auxiliary structure for bridge pier maintenance according to claim 2, characterized in that, The protective sleeve (42) has a constriction (421) for fitting onto the top of the pier (2).

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