Method for dismantling waste anchoring type revetment structure

Abstract

The invention discloses a waste anchoring type revetment structure dismantling method which comprises the steps that S1, construction preparation is conducted, specifically, a construction area is investigated in detail, and complete information of a revetment structure is obtained; s2, a back pressure platform is built, specifically, in the revetment seaside area, the back pressure platform is formed through sand throwing, and sand bodies are densified through a vibroflotation method; s3, a water retaining structure is established, specifically, in the revetment side area, a slope is built, the height of the water retaining structure is increased, and the reliable water retaining structure is formed; and S4, structure dismantling is conducted, specifically, an anchoring structure, a breast wall and a steel sheet pile of the revetment are sequentially dismantled in a step-by-step advancing mode. The safety, stability and high efficiency of the construction process are ensured.

Description

Technical Field

[0001] The invention relates to the field of hydraulic engineering technology, in particular to a method for dismantling a waste anchor-type revetment structure. Background Art

[0002] Anchor-type revetment structure is a common support form in hydraulic engineering projects. It forms a stable structural system through the retaining wall at the front, the anchor wall at the rear and the tie rods connecting the two. This type of revetment is usually used in docks, shipyards and shoreline protection projects. However, with the increase of the service life of the structure, affected by multiple factors such as tidal erosion in the marine environment, structural aging, anchor corrosion and foundation settlement, the abandoned anchor-type revetment structure gradually loses its original functionality and safety, and needs to be dismantled in order to implement shoreline restoration and new project construction.

[0003] During the demolition of the old anchor-pull revetment, due to its high technical difficulty and potential risks, as well as the special location of the revetment, the stability of the soil and the safety of the surrounding structures must be taken into account during the demolition operation to ensure smooth construction and a safe and reliable environment.

[0004] When dismantling the anchor-type revetment structure, the general construction idea is to use the method of lowering the soil behind the revetment steel sheet pile wall to reduce the stress of the anchor system, and then dismantle the stress system. However, this method usually faces the following problems:

[0005] (1) During the revetment dismantling operation, due to the need to implement large-scale soil lowering operations, the tie rods are prone to being suspended in the air. This situation may lead to a decrease in the overall stability of the revetment structure, significantly increasing the potential risks in construction. In addition, during the mechanical dismantling process, in order to avoid secondary problems caused by the instability of the tie rods, their stress state needs to be continuously monitored. This not only increases the difficulty of construction technology, but also reduces the dismantling efficiency to a certain extent.

[0006] (2) Most revetment removal operations are carried out in coastal areas, and the structural excavation work is easily affected by the rise and fall of tides. Therefore, the construction must be carried out in accordance with the tidal time window. If the tide surges into the construction area, it is necessary to wait for low tide to drain water before resuming operations, which will extend the construction period. At the same time, the bearing capacity of the foundation may decrease after repeated immersion, thus posing a safety hazard. In addition, soil excavation is often affected by the tide and needs to be carried out underwater, which not only significantly increases the construction difficulty and cost, but also reduces the overall construction efficiency.

[0007] (3) The direct excavation method requires high monitoring accuracy. During the implementation process, continuous dynamic monitoring is required to grasp the stability of the soil and anchor structure in real time. Only through accurate monitoring methods can the safety and reliability of excavation operations be ensured and potential structural instability problems can be effectively prevented.

[0008] At present, the method of lowering the soil behind the wall in the construction of anchor-pull revetment demolition mainly releases the stress of the anchor-pull system by lowering the height of the soil behind the wall, and then demolishes the structure. Although this method can complete the basic demolition work, it has problems such as low construction efficiency, significant environmental impact and low resource utilization, which makes it difficult to meet the comprehensive requirements of modern hydraulic projects for efficiency and economy.

[0009] Therefore, in view of the above problems, a method for dismantling an old and abandoned anchor-type revetment structure is provided. Summary of the invention

[0010] The purpose of the present invention is to overcome the existing defects and provide a method for dismantling a waste anchor-type revetment structure, thereby ensuring the safety, stability and high efficiency of the construction process.

[0011] The technical solution to achieve the above purpose is:

[0012] A method for dismantling a waste anchor-type revetment structure, comprising:

[0013] Step S1, construction preparation, conduct detailed investigation on the construction area and obtain complete information of the revetment structure;

[0014] Step S2, constructing a back pressure platform. In the seaside area of ​​the revetment, a back pressure platform is formed by throwing sand, and the sand body is densified by vibroflotation;

[0015] Step S3, establishing a water retaining structure, building a slope in the bank side area of ​​the revetment and raising the height of the water retaining structure to form a reliable water retaining structure;

[0016] Step S4, structural dismantling, adopts a step-by-step approach to dismantle the anchoring structure, breast wall and steel sheet piles of the revetment in sequence.

[0017] Preferably, in step S1, the complete information of the revetment structure includes verification of the completion drawings, detection of hidden works and analysis of the stability of the surrounding environment.

[0018] Preferably, in step S1, the construction preparation includes the following two parts:

[0019] Remove the track beams and the steel pipe columns supporting them;

[0020] In the area behind the existing steel sheet piles, the soil is controlled to an elevation of CD+3.00.

[0021] Preferably, in step S2, the back pressure platform is constructed, specifically comprising:

[0022] According to the requirements of the drawings, sand is filled to CD+0.00 in front of the revetment by sand filling, and the sand body is densified by vibroflotation to form a back pressure platform.

[0023] Preferably, in step S3, the water retaining structure is established, specifically including:

[0024] The soil behind the water retaining structure is excavated to a depth of CD+1.50 to form a reliable water retaining structure.

[0025] Preferably, in step S4, after the tie rods are cut at the anchoring points of the breast wall and the anchoring structure, they are directly pulled out of the original soil by a pulling machine, wherein the soil behind the water retaining structure is excavated to CD-0.30 before the anchoring structure is dismantled.

[0026] Preferably, in step S4, during the breast wall removal process, the backfilling and excavation of the soil are rationally planned, and the chiseling and removal of the breast wall and related structures are completed in stages.

[0027] Preferably, in step S4, the steel sheet piles are removed by using pile pulling technology.

[0028] Preferably, in step S4, after the anchoring structure, breast wall and steel sheet piles are removed, the soil layer is backfilled to CD+4.7 and vibratory compaction is performed.

[0029] The beneficial effects of the present invention are:

[0030] 1) The present invention innovatively forms a counter-pressure platform by throwing sand in the revetment sea survey area, and uses a vibro-impact method to compact the sand body, thereby realizing a safe conversion of the force system of the revetment structure from a tie rod support to a counter-pressure platform support, greatly improving the stability and safety of the construction area, and largely eliminating the potential safety hazards of instability of old and abandoned structures;

[0031] 2) The present invention arranges an efficient water retaining structure in the shore area to effectively prevent the tide from entering the construction area, creating a dry construction environment, avoiding the increase in construction costs and extension of construction period caused by tidal interference in traditional processes, and providing stable construction conditions for subsequent revetment removal;

[0032] 3) In the stage of structural demolition, the present invention cuts the tie rods at the anchor points of the breast wall and the anchor structure, and then directly pulls the tie rods out of the original soil through a pulling machine, thereby avoiding the high risk of the tie rods hanging in the air and reducing the amount of soil excavation;

[0033] In summary, the present invention optimizes the construction process through scientific research and design, accurately divides the order of back pressure platform construction, water retaining system layout and step-by-step structure dismantling, reduces the complex working conditions in traditional construction, and ensures the efficiency, stability and safety of the overall process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The present invention is a flow chart of a method for dismantling a waste anchor-type revetment structure. DETAILED DESCRIPTION

[0035] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0036] The present invention will be further described below in conjunction with the accompanying drawings.

[0037] like Figure 1 As shown, a method for dismantling an old anchor-type revetment structure comprises:

[0038] Step S1, construction preparation, conduct a detailed survey of the construction area and obtain complete information on the revetment structure.

[0039] In the embodiment, the complete information of the revetment structure includes verification of the as-built drawings, detection of hidden works, and analysis of the stability of the surrounding environment.

[0040] In the embodiment, the construction preparation includes the following two parts:

[0041] Remove the track beams and the steel pipe columns supporting them;

[0042] In the area behind the existing steel sheet piles, the soil is controlled to an elevation of CD+3.00.

[0043] Step S2, the construction of the counter-pressure platform. In the sea side area of ​​the revetment, a counter-pressure platform is formed by sand throwing, and the sand body is densified by the vibration method, so as to realize the safe conversion of the force system of the revetment structure from the tie rod support to the counter-pressure platform support, greatly improve the stability and safety of the construction area, and eliminate the safety hazard of instability of the old structure to a large extent.

[0044] In the embodiment, the back pressure platform is constructed, specifically including:

[0045] According to the requirements of the drawings, sand is filled to CD+0.00 in front of the revetment by sand filling, and the sand body is densified by vibroflotation to form a back pressure platform.

[0046] Step S3, the water retaining structure is established. In the bank side area of ​​the revetment, a slope is built and the height of the water retaining structure is raised to form a reliable water retaining structure, which effectively prevents the tide from entering the construction area, creates a dry construction environment, avoids the increase in construction costs and extension of construction period caused by tidal interference in traditional processes, and provides stable construction conditions for subsequent revetment demolition.

[0047] In the embodiment, the water retaining structure is established, specifically including:

[0048] The soil behind the water retaining structure is excavated to a depth of CD+1.50 to form a reliable water retaining structure.

[0049] Step S4, structural dismantling, adopts a step-by-step approach to dismantle the anchoring structure, breast wall and steel sheet piles of the revetment in sequence.

[0050] In the embodiment, after the tie rods are cut at the anchoring points of the breast wall and the anchoring structure, the tie rods are directly pulled out of the original soil by a pulling machine, thereby avoiding the high risk of the tie rods hanging in the air and reducing the amount of soil excavation. Among them, the soil behind the water retaining structure is excavated to CD-0.30 to create construction conditions for the dismantling of the anchoring structure, and then the dismantling of the anchoring structure is carried out.

[0051] In the embodiment, during the breast wall removal process, the backfilling and excavation of the soil are rationally planned, and the chiseling and removal of the breast wall and related structures are completed in stages.

[0052] In the embodiment, the steel sheet piles are removed by using the pile pulling technology.

[0053] In the embodiment, after the anchoring structure, breast wall and steel sheet piles are removed, the soil layer is backfilled to CD+4.7 and vibratory compaction is performed.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some or all of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for dismantling an old anchor-type revetment structure, characterized in that: include: Step S1, construction preparation, conduct detailed investigation on the construction area and obtain complete information of the revetment structure; Step S2, constructing a back pressure platform. In the seaside area of ​​the revetment, a back pressure platform is formed by throwing sand, and the sand body is densified by vibroflotation; Step S3, establishing a water retaining structure, building a slope in the bank side area of ​​the revetment and raising the height of the water retaining structure to form a reliable water retaining structure; Step S4, structural dismantling, adopts a step-by-step approach to dismantle the anchoring structure, breast wall and steel sheet piles of the revetment in sequence.

2. A method for dismantling a waste anchor-type revetment structure according to claim 1, characterized in that: In step S1, the complete information of the revetment structure includes checking the completion drawings, detecting hidden works and analyzing the stability of the surrounding environment.

3. The method for dismantling a waste anchor-type revetment structure according to claim 1, characterized in that: In step S1, the construction preparation includes the following two parts: Remove the track beams and the steel pipe columns supporting them; In the area behind the existing steel sheet piles, the soil is controlled to an elevation of CD+3.

00.

4. A method for dismantling a waste anchor-type revetment structure according to claim 1, characterized in that: In step S2, the back pressure platform is constructed, specifically including: According to the requirements of the drawings, sand is filled to CD+0.00 in front of the revetment by sand filling, and the sand body is densified by vibroflotation to form a back pressure platform.

5. The method for dismantling a waste anchor-type revetment structure according to claim 1, characterized in that: In step S3, the water retaining structure is established, which specifically includes: The soil behind the water retaining structure is excavated to a depth of CD+1.50 to form a reliable water retaining structure.

6. The method for dismantling a waste anchor-type revetment structure according to claim 1, characterized in that: In step S4, after the tie rods are cut at the anchoring points of the breast wall and the anchoring structure, they are directly pulled out of the original soil by a pulling machine, wherein the soil behind the water retaining structure is excavated to CD-0.30, and then the anchoring structure is dismantled.

7. The method for dismantling a waste anchor-type revetment structure according to claim 1, characterized in that: In step S4, during the breast wall removal process, the backfilling and excavation of the soil are rationally planned, and the removal of the breast wall and related structures is completed in stages.

8. The method for dismantling a waste anchor-type revetment structure according to claim 1, characterized in that: In the step S4, the steel sheet piles are removed by using the pile pulling technology.

9. The method for dismantling a waste anchor-type revetment structure according to claim 1, characterized in that: In step S4, after the anchoring structure, breast wall and steel sheet piles are removed, the soil layer is backfilled to CD+4.7 and vibrated and compacted.

Images