Structure for permanently protecting scouring pit of bridge pier and implementation method

Abstract

The invention discloses a structure for permanently protecting a scouring pit of a bridge pier and an implementation method. The structure comprises bagged broken stones, bagged concrete and a soft mattress, the bagged broken stones are thrown and filled into the core pit, so that the bottom bed can be effectively covered, and the effects of a cushion layer, an inverted filter layer and a filling pit are achieved; the tops of the bagged gravels are covered with bagged concrete, and the concrete effectively plays a role in compacting and protecting the bagged gravels through self-flowing deformation; the soft mattress is laid on the two sides of the bridge pier in a concrete interlocking block mattress mode to protect bottom beds on the two sides of the bridge pier from being scoured, and mattress edges are pressed by thickened concrete interlocking pieces to prevent water flow from lifting the mattress. The structure has the effects that the surface resists water flow scouring, and the bottom protects the bottom bed from being scoured, so that the aim of permanently protecting the scouring pit of the pier is fulfilled. The implementation of the structure comprises the following three steps: paving the interlocking block soft mattress, throwing and filling bagged broken stones, and throwing and filling bagged concrete. Wherein in the throwing and filling process, a throwing and filling ship special for an inclined chute tube is adopted, accurate throwing and filling are achieved, and the bridge pile foundation is effectively protected.

Description

Technical Field

[0001] The invention relates to the technical field of bridge foundation construction, and in particular to a structure and an implementation method for permanently protecting bridge pier scour pits. Background Art

[0002] Water damage to bridges has become the primary factor in bridge collapse and failure. It is characterized by significant suddenness, great destructiveness, high concealment, and high repair costs. Among them, scouring of bridge pier pile foundations is one of the main causes of bridge water damage, and accidents of bridge pier scouring and damage to bridges still occur frequently. Due to the influence of various factors such as tides, wind and waves, and sediment rheology caused by upper dynamic loads, the common scouring problem of pier pile foundations has gradually emerged. The traditional technical solution uses protective riprap technology to protect bridge pile foundations from erosion by natural factors such as water flow, wind and waves, but the protection effect of this technology is poor. The stone barrier is difficult to effectively block the erosion of natural factors such as water flow, wind and waves, and the pile foundation is easily damaged.

[0003] The traditional stone dumping protection scheme has large gaps between the stones, and the water flow can penetrate the gaps and erode the riverbed. As the erosion progresses, the dumped stones will sink and slide, causing the protection body to fail and have poor durability. Based on this, Chinese utility model patent CN213773502U (publication date: July 23, 2021) discloses a scouring protection layer for offshore wind turbine foundations in the inland shelf sea area. The utility model adopts partial grouting of riprap and artificial cotton mortar for filling. Partial grouting of riprap has advantages over rigid structures. It is flexible when subjected to flow erosion and can effectively prevent the leakage of fine sand between the stones. Partial grouting can also improve the overall stability of the riprap device without sacrificing flexibility or permeability. Chinese utility model patent CN220644357U (publication date: March 22, 2024) discloses a seabed scour protection structure, which can solve the problem that the riprap layer in the current riprap protection sinks and fails due to the migration of bed sand caused by the water flow, resulting in the riprap protection being unsustainable.

[0004] Although the above existing technologies can improve the stability and durability of riprap protection, the safety problem of pile foundation is not solved. In view of the problems existing in the existing technologies and considering the protection and construction requirements of the over-scouring of the piers of the cross-sea bridge, the present invention proposes the protection of the scouring pit and the surrounding seabed by combining bagged gravel + bagged concrete + interlocking block soft row, which not only solves the problems of poor durability of traditional protection methods and difficulty in ensuring the safety of riprap pile foundation, but also effectively protects the scouring of the pier pile foundation and ensures the safety of the structure. Summary of the invention

[0005] In view of the above problems, the present invention provides a structure and implementation method for permanently protecting bridge pier scour pits.

[0006] A structure for permanent protection of bridge pier scour pits includes bagged gravel, concrete and soft pads. The bagged gravel is located at the bottom of the bridge body and is arranged around the bridge body pile foundation. The top of the bagged gravel is covered with bagged concrete. The soft pads are arranged on both sides of the bridge body pile foundation.

[0007] Furthermore, the bagged gravel is made of flexible material, and the weight of a single bag is not less than 150kg. The specific weight is calculated and determined according to the water flow velocity in the bridge area to ensure its own stability during dumping. The bag is made of woven cloth material, which plays the role of an inverted filter layer, can effectively prevent the bottom bed from being activated by the downward water flow, and play the role of scouring protection.

[0008] Furthermore, the thickness of the bagged gravel filling is not less than 2m, and the circumference of the bagged gravel (1) protection pile is not less than 2.5m.

[0009] Furthermore, the bagged concrete is covered with 3 layers, with a thickness of 1.5-2.0 m, to ensure full coverage of the bagged gravel;

[0010] Furthermore, the weight of a single bag of the bagged concrete is not less than 150 kg, which satisfies the stability under the water flow conditions in the bridge area. The bag is made of woven fabric material, the concrete strength is C25, and it solidifies underwater after dumping.

[0011] A method for implementing a structure for permanent protection of bridge pier scour pits comprises the following steps:

[0012] Step 1: Lay interlocking block soft rows on both sides of the scour pit bridge;

[0013] Step 2: Throw bagged gravel into the core pit; it can effectively cover the bottom bed and serve as a cushion layer, filter layer and pit filling;

[0014] Step 3: Cover the bagged gravel with bagged concrete; the concrete effectively protects the bagged gravel by self-flowing.

[0015] Furthermore, in step 1, the soft material rows are laid on both sides of the bridge pier in an interlocking block manner;

[0016] Furthermore, the soft material row is pressed under the bagged gravel near the pier, and is laid in a single row. The outer side is laid in a double-layer thickened manner using interlocking sheets to prevent the row from being lifted by water.

[0017] Furthermore, in step 2, bagged gravel is dumped to fill the core pit.

[0018] Furthermore, the step 2 includes bagging of gravel and dumping construction.

[0019] Furthermore, the step 3 includes concrete mixing, concrete bagging, and filling construction.

[0020] Furthermore, the dumping construction adopts a special dumping ship with an inclined chute, which can achieve precise dumping and effectively protect the bridge pile foundation.

[0021] Furthermore, in step 1, a laying vessel is used to lay the soft layer.

[0022] Compared with the prior art, the advantages and effects of this application are as follows:

[0023] 1. The lower part of the present invention is backfilled with bagged gravel. The bagged gravel can not only play the role of cushion layer and filter layer, but also play the role of filling scour pits as backfill materials. In order to prevent the bagged gravel from being damaged and causing the gravel to be lost, the present invention covers the upper part with bagged concrete wet mix. After the bagged concrete wet mix is ​​bagged, it is thrown to the top of the bagged gravel. The concrete wet mix in the bag will deform by self-flow according to the undulation of the terrain and densely cover the top of the bagged gravel. In order to ensure full coverage, it is generally considered to throw 3 layers of bagged concrete wet mix. After the bagged concrete solidifies and hardens, it plays the role of preventing surface scour. The present invention can provide long-term protection for the scour pit of the pier pile foundation through the combined protection invention of the backfill material and the surface protection material.

[0024] 2. The bagged gravel and bagged concrete of the present invention are both flexible structures when dumped, have no sharp edges and corners, and are protected by woven bags. When they fall and encounter pile foundations, they will deform, thereby well protecting the pile foundations from damage.

[0025] 3. The present invention lays soft drains on both sides of the scouring pit. The soft drains can fit tightly with the seabed to prevent the seabed bottom from being scoured. In order to prevent the edge of the soft drain from being lifted up by the wave current, the concrete interlocking blocks on the edge of the drain are thickened to increase the weight of the drain to ensure the safety of the drain body. At the same time, there is no obvious mutation of the seabed, thereby protecting the safety of the seabed near the pit.

[0026] 4. The dumping process described in the present invention uses a special dumping ship with an inclined chute, which can achieve accurate dumping, high filling efficiency, and effective protection of the bridge pile foundation.

[0027] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application so that it can be implemented in accordance with the contents of the specification, and to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following is a detailed description of the preferred embodiments of the present application in conjunction with the accompanying drawings as follows.

[0028] Based on the detailed description of the specific embodiments of the present application in combination with the accompanying drawings below, those skilled in the art will become more aware of the above and other objects, advantages and features of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0030] in:

[0031] Figure 1 A cross-sectional view of the bridge pile foundation scour protection provided by the present invention;

[0032] Figure 2 A cross-sectional view of the soft row protection provided by the present invention;

[0033] Figure 3 A longitudinal section diagram of the bridge pile foundation scour protection provided by the present invention;

[0034] Among them: 1-bagged gravel; 2-bagged concrete; 3-soft pile; B1-lateral width of bagged gravel protection; B2-distance between the edge of soft pile and the center of bridge; B3-width of soft pile; B4-distance between the exposed edge of longitudinal pile and the center of bridge pier; B5-external width of bagged gravel protection pile; B6-external longitudinal width of bagged concrete pit protection. Specific embodiments

[0035] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiment of the present application, rather than all of the embodiments. In the following description, specific details such as specific configuration and components are provided only to help fully understand the embodiments of the present application. Therefore, it should be clear to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. In addition, for clarity and brevity, the description of known functions and structures is omitted in the embodiment.

[0036] It should be understood that the references to "one embodiment" or "this embodiment" throughout the specification mean that the specific features, structures, or characteristics associated with the embodiment are included in at least one embodiment of the present application. Therefore, the references to "one embodiment" or "this embodiment" appearing throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0037] In addition, the present application may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed.

[0038] The term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, B exists alone, and A and B exist at the same time. The term " / and" in this article describes another type of association object relationship, indicating that there can be two relationships. For example, A / and B can mean: A exists alone, and A and B exist alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0039] The term "at least one" in this article is merely a description of the association relationship of associated objects, indicating that there may be three relationships. For example, at least one of A and B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0040] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusions.

[0041] Example 1

[0042] This embodiment mainly introduces a structure that plays a permanent role in protecting bridge pier scour pits. For its cross-sectional view, please refer to Figure 1 , which includes: bagged gravel 1, bagged concrete 2 and soft pile 3;

[0043] The bagged gravel 1 is located at the bottom of the bridge body and is arranged around the pile foundation of the bridge body;

[0044] The bagged gravel 1 is covered with bagged concrete 2, and the concrete effectively plays a role of compacting and protecting the bagged gravel 1 through self-flow deformation;

[0045] The soft body rows 3 are arranged on both sides of the bridge pile foundation.

[0046] Preferably, the bagged gravel 1 is made of flexible material, the filling thickness is not less than 2m, and the outer width of the bagged gravel 1 protective pile is not less than 2.5m.

[0047] Preferably, the weight of a single bag of bagged gravel 1 is not less than 150 kg to ensure its own stability during dumping. The bag is made of woven cloth material, which acts as a filter layer and can effectively prevent the bottom bed from being activated by the downward flow, thereby achieving the purpose of scour protection.

[0048] Preferably, the strength of the bagged concrete 2 is C25, and it solidifies underwater after dumping. The bagged concrete 2 is covered with 3 layers with a thickness of 1.5m to ensure full coverage of the bagged gravel.

[0049] Preferably, the weight of a single bag of the bagged concrete 2 is not less than 150 kg, and the bag is made of woven fabric.

[0050] The technical effect obtained by this embodiment is as follows: the lower part of the present invention is backfilled with bagged gravel, which can not only play the role of cushion layer and filter layer, but also play the role of filling scour pits as backfill material; in order to prevent the bag of bagged gravel from being damaged and causing the gravel to be lost, the upper part of the present invention is covered with bagged concrete wet mix, which is bagged and thrown on the top of the bagged gravel. The concrete wet mix in the bag will deform by self-flowing according to the undulations of the terrain and densely cover the top of the bagged gravel. In order to ensure full coverage, it is generally considered to throw 3 layers of bagged concrete wet mix, and the bagged concrete plays a role in preventing surface scour after solidification and hardening; the present invention can play a long-term protection role in the scour pit of the pier pile foundation through the combined protection invention of backfill material and surface protection material; in addition, bagged gravel and bagged concrete are both flexible structures when thrown and filled, without sharp edges and corners, and are protected by woven bags. When they fall and encounter the pile foundation, they will deform, thereby protecting the pile foundation from damage.

[0051] Example 2

[0052] Based on Example 1, this example relates to an implementation method of a structure for permanently protecting a bridge pier scour pit, comprising the following steps:

[0053] Step 1: Lay interlocking block soft row 3 on both sides of the scour pit bridge;

[0054] Step 2: Throwing bagged gravel 1;

[0055] Step 3: Throwing bagged concrete 2;

[0056] Preferably, in step 1, the soft material rows 3 are laid on both sides of the pier in an interlocking block manner.

[0057] Preferably, the soft material row 3 is laid in a single row near the pier, and the outer side is laid in a double-layer thickened manner with interlocking sheets to prevent water from lifting the row. Figure 2 .

[0058] Preferably, in step 2, the bagged gravel 1 is thrown into the core pit to effectively cover the bottom bed, and serves as a cushion layer, a filter layer and a pit filler;

[0059] Preferably, the step 2 includes bagging of crushed stone and dumping and filling construction;

[0060] Preferably, step 3 includes concrete mixing, concrete bagging, and dumping construction;

[0061] Preferably, step 2 and step 3 are completed in an integrated manner.

[0062] Preferably, in step 2 and step 3, a special dumping ship with an inclined chute is used for dumping construction, which can achieve precise dumping and effectively protect the bridge pile foundation.

[0063] Preferably, in step 1, a laying vessel is used to lay the soft layer.

[0064] The technical effect of this embodiment is: the present invention lays soft-body rows on both sides of the scouring pit, and the soft-body rows can fit tightly with the seabed to prevent the seabed bottom from being scoured. In order to prevent the edge of the soft-body row from being lifted by the wave current, the row edge concrete interlocking blocks are thickened to increase the weight of the row pressure to ensure the safety of the row body. At the same time, there is no obvious sudden change in the seabed, thereby protecting the safety of the pit edge seabed. The dumping process of the present invention adopts a special dumping ship for inclined chute, which can achieve accurate dumping, high dumping efficiency, and effective protection of bridge pile foundations.

[0065] The above description is only the preferred embodiment of the present invention, which does not limit the protection scope of the present invention. For those skilled in the art, the present invention can be modified and varied in various ways. Within the spirit and principle of the present invention, any change, modification, replacement, integration and parameter change of these embodiments by conventional substitution or capable of achieving the same function without departing from the principle and spirit of the present invention shall fall within the protection scope of the present invention.

Claims

1. A structure for permanent protection of bridge pier scour pits, characterized in that: It comprises bagged crushed stone (1), bagged concrete (2) and soft pile (3); The bagged gravel (1) is located at the bottom of the bridge body and is arranged around the bridge body pile foundation; The bagged gravel (1) is covered with bagged concrete (2); The soft body rows (3) are arranged on both sides of the bridge pile foundation.

2. A structure for permanent protection of bridge pier scour pits according to claim 1, characterized in that: The bagged gravel (1) is made of flexible material, the weight of a single bag is not less than 150kg, the thickness of the dumping is not less than 2m, the circumference of the bagged gravel (1) protective pile is not less than 2.5m, and the bag is made of woven cloth material.

3. A structure for permanent protection of bridge pier scour pits according to claim 1 or 2, characterized in that: The bagged concrete (2) is covered with 3 layers, with a thickness of 1.5-2.0m, and a single bag weighs no less than 150kg. The bag is made of woven fabric material, and the concrete strength is C25.

4. A method for implementing a structure for permanent protection of bridge pier scour pits according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1: Lay interlocking block soft rows (3) on both sides of the scour pit bridge; Step 2: Throwing bagged gravel (1); Step 3: Throw bagged concrete (2).

5. The method for implementing a structure for permanent protection of bridge pier scour pits according to claim 4, characterized in that: In step 1, the soft material row (3) is laid on both sides of the bridge pier in an interlocking block manner, wherein the side near the bridge pier is pressed under the bagged gravel (1) and laid in a single row, and the outer side is laid in a double-layer thickening manner using interlocking pieces.

6. The method for implementing a structure for permanent protection of bridge pier scour pits according to claim 4 or 5, characterized in that: In step 2, bagged gravel (1) is dumped into the core pit.

7. The method for implementing a structure for permanent protection of bridge pier scour pits according to claim 6, characterized in that: The step 2 includes bagging of crushed stones and dumping and filling construction.

8. The method for implementing a structure for permanent protection of bridge pier scour pits according to claim 4, characterized in that: The step 3 includes concrete mixing, concrete bagging and filling construction.

9. The method for implementing a structure for permanent protection of bridge pier scour pits according to claim 8 or 9, characterized in that: The dumping construction adopts a special dumping ship with an inclined chute.

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