Construction method for protecting the lower pier structure during the demolition and reconstruction of the upper building of the Laozha

Abstract

The invention discloses a construction method for protecting the lower pier structure during the demolition and reconstruction of the upper building of the Lao Zha, belonging to the technical field of water conservancy projects; it includes the following steps: S1, constructing a diversion culvert: installing a concrete pipe that meets the requirements for regulating the upstream and downstream water levels in one hole of the outermost side span for diversion; S2, constructing and filling a protection platform: pushing earth from both sides of the sluice to fill the cofferdam until it reaches the protective soil layer higher than the pier to serve as a construction platform; S3, demolishing the upper building structure: using a hydraulic crusher for demolition, transporting the demolished materials as they are demolished until the demolition is completed; S4, demolishing the cofferdam and the diversion culvert: demolishing the cofferdam in layers, lifting out the diversion culvert, flushing the pier and the slope protection to complete the demolition task. The invention provides protection for the lower structure such as the pier and the bottom slab while creating dry land operations, facilitating mechanized demolition and slag removal.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy projects, and particularly to a construction method for protecting the lower pier structure during the demolition and reconstruction of the upper building of an old sluice. Background Technique

[0002] As a common hydraulic structure in water conservancy projects, the sluice plays a crucial role in water conveyance, water retention, and water diversion, and is even related to the social and economic development and the balance of the natural ecology. The sluice has been eroded by water flow all year round, or has encountered floods beyond the standard and human activities, and has been damaged to varying degrees. The main manifestations are: being washed away during the flood season, carbonation of concrete, spalling, exposed steel bars, cracks, aging of metal structures, and difficult opening and closing of the gates. Common techniques for dealing with such quality problems include pouring additional concrete, removing carbonated concrete, spalling, and floating slag at the exposed steel bar areas, brushing them clean with a wire brush, and repairing them with high-strength cement mortar or epoxy mortar. Chemical grouting is used to plug the fine cracks, and for metal structure problems, techniques such as replacing parts or repairing and maintaining are adopted. The problems of reconstruction and rebuilding are imminent, and the reconstruction of the sluice must be carried out strictly in accordance with the relevant regulations at the present stage.

[0003] When demolishing and reconstructing the upper sluice house, it is also necessary to protect the structures such as the lower piers, bank slopes, and bottom plates. The current operation is to directly break the upper building structure; during this process, it is inevitable to have a certain impact on the lower structure, or even cause damage. When constructing on the pier structure, the rolling and operation of various mechanical equipment have an adverse impact on the pier structure; at the same time, some pier structures are also difficult to support mechanical equipment and are not sufficient to provide enough construction space, thus increasing the construction difficulty and having a certain safety risk; in addition, there are also inconveniences for the slag removal process after demolition.

[0004] Therefore, our company has researched and designed a construction technology for protecting the lower pier structure during the demolition and reconstruction of the upper building of an old sluice; under the condition of creating dry land operation, facilitating mechanized demolition and slag removal, it provides protection for the lower structures such as piers and bottom plates; and on the basis of eliminating the hidden dangers of the sluice, it makes reasonable and effective use of the original sluice engineering facilities, effectively improves the reconstruction construction quality, and enhances the engineering function and appearance image of the sluice. Summary of the Invention

[0005] The purpose of the present invention is to solve the problems of many inconveniences existing in the construction of the demolition and reconstruction of the upper building of an old sluice in the prior art, and to propose a construction method for protecting the lower pier structure during the demolition and reconstruction of the upper building of an old sluice.

[0006] In order to achieve the above purpose, the present invention adopts the following technical scheme:

[0007] A construction method for protecting the lower pier structure during the demolition and reconstruction of the upper building of an old sluice includes the following steps:

[0008] S1, Construction diversion culvert: Install a concrete pipe that meets the requirements of regulating the upstream and downstream water levels in one hole of the outermost side span for diversion.

[0009] S2, Filling of construction protection platform: Push earth from both sides of the sluice to fill the cofferdam until it reaches the protective soil layer higher than the pier to serve as the construction platform.

[0010] S3, Demolition of the upper building structure: Use a hydraulic crusher for demolition and transport the demolished materials immediately until the demolition is completed.

[0011] S4, Demolition of the cofferdam and diversion culvert: Demolish the cofferdam in layers, lift out the diversion culvert, wash the pier and slope protection to complete the demolition task.

[0012] In some embodiments, it further includes:

[0013] Construction period selection: Construct during the non-flood season.

[0014] In some embodiments, in step S1:

[0015] Calculate the flow rate in the river channel according to the flood results in the designed river channel and the actual on-site situation, install socketed concrete pipes for diversion.

[0016] In some embodiments, in step S1:

[0017] When installing the concrete pipe, open other gates to keep the gates in the flow-through state to reduce the drowning risk brought about during the installation of the concrete diversion pipe.

[0018] In some embodiments, in step S1:

[0019] Build temporary cofferdams upstream and downstream of the gate where the concrete pipe is installed, drain the accumulated water in the cofferdam to ensure dry construction for the diversion pipe.

[0020] Calculate the installation length of the diversion pipe according to the width, height and slope ratio of the fill above.

[0021] In some embodiments, in step S2:

[0022] Push earth from both sides of the sluice to fill the cofferdam with a 1:2 slope ratio for the upstream and downstream 10m centered on the bent column, and fill it to the protective soil layer 0.5m higher than the pier to serve as the construction platform.

[0023] In some embodiments, in step S2:

[0024] After the filling above the diversion culvert is completed, lower the opened gates to use the gates as the anti-seepage wall for the upstream and downstream cofferdams; after each hole's gate is lowered, earth can be pushed from both sides of the sluice to fill the cofferdam; use a vibratory roller to compact it in layers until it reaches the protective soil layer 0.5m higher than the pier.

[0025] In some embodiments, in step S2, it further includes:

[0026] After the filling is completed, a layer of anti-seepage film is laid on both the water-facing side and the backwater side.

[0027] In some embodiments, when laying the anti-seepage film, gravity rolling paving is adopted;

[0028] Calculate the slope length, evenly wind the film around the steel pipe; tie ropes at both ends to facilitate the recovery of the steel pipe; adopt gravity natural sliding and rolling paving to the toe of the cofferdam slope; overlap 0.5 m wide between two films, and use earth bags to roll and press while rolling and paving.

[0029] In some embodiments, in step S4:

[0030] Two collars are rotatably arranged at both ends of the steel pipe, and the ropes are tied to the collars.

[0031] Compared with the prior art, the present invention provides a construction method for protecting the lower pier structure during the demolition and reconstruction of the upper building of an old sluice, and has the following beneficial effects.

[0032] 1. In the present invention, under the conditions of creating dry land operation, facilitating mechanized demolition and slag removal, protection is provided for the lower structure such as the pier and the bottom slab.

[0033] 2. In the present invention, on the basis of eliminating the hidden dangers of the sluice, the original sluice engineering facilities are reasonably and effectively utilized, the reconstruction construction quality is effectively improved, and the engineering function and appearance image of the sluice are improved.

[0034] 3. In the present invention, the construction process is simple. Without cutting off the flow and without increasing the cost of additional diversion measures, effective protection is provided for the underlying retained structure, and the conditions for dry land operation are created, effectively reducing the difficulty of demolition operation and the safety risks brought by demolition.

[0035] Other advantages, objectives and features of the present invention will be described to some extent in the subsequent specification; and to some extent, based on the study of the following text, it will be obvious to those skilled in the art; or, it can be taught from the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic structural diagram of the present invention.

[0037] Figure 2 It is a schematic structural diagram of the water-facing side of the present invention.

[0038] Figure 3 It is a schematic top view structural diagram of the present invention.

[0039] In the figure:

[0040] 1. Upper building structure; 2. Gate pier; 3. Concrete pipe; 4. Cofferdam; 5. Impervious membrane; 6. Flap gate. Specific implementation manners

[0041] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0042] Refer to Figures 1-3 , a protection construction method for the lower gate pier structure during the demolition and reconstruction of the upper building of the old sluice, including the following steps:

[0043] Construct a diversion culvert, fill a construction protection platform, demolish the upper building structure, and demolish the cofferdam and the diversion culvert.

[0044] It should be noted that the construction period also needs to be selected; the construction is carried out during the non-flood season, that is, from November of each year to April of the following year.

[0045] The specific construction steps are as follows.

[0046] S1. Construct a diversion culvert:

[0047] In the outermost span of the gate pier 2 of the sluice, install a concrete pipe 3 that meets the requirements of regulating the upstream and downstream water levels for diversion.

[0048] As Figure 2 shown; raise the gate at the installation position and install the pipes section by section to form a diversion culvert.

[0049] Among them, calculate the flow in the river channel according to the flood results in the designed river channel and the actual on-site situation to select pipes with different diameters; for example, in a certain project, install a DN1500mm secondary socket-type concrete pipe 3 for diversion.

[0050] It can be understood that preferably, socket-type concrete pipes are used, which are convenient for construction, have good connectivity, and are convenient for later recycling.

[0051] It should be noted that when installing the concrete pipe 3, try to open other gates to keep the gates in a flowing state to reduce the drowning risk brought by the installation of the concrete pipe.

[0052] At the same time, build temporary cofferdams on both the upstream and downstream of the gate of the span where the concrete pipe 3 is installed, and drain the accumulated water in the temporary cofferdam to ensure dry construction of the diversion culvert.

[0053] In addition, the installation length of the diversion culvert is calculated according to the width, height and slope ratio of the fill above.

[0054] For example, taking 10 m upstream and downstream of the center of the bent column as the construction platform, with the slope ratios of the upstream and downstream water faces both being 1:2 and the height of the cofferdam platform being calculated as 6.25 m, the length of the diversion culvert is 46 m.

[0055] After the installation of the diversion culvert is completed, finally install the flap gate 6 to prevent backflow.

[0056] S2, filling of the construction protection platform:

[0057] Push earth from both sides of the sluice to fill the cofferdam 4 until it reaches the protective soil layer that is higher than the pier 2, serving as the construction platform.

[0058] Preferably, taking 10 m upstream and downstream of the center of the bent column, with the slope ratios of the upstream and downstream water faces being 1:2, push earth from both sides of the sluice to fill the cofferdam 4 until it reaches the protective soil layer that is 0.5 m higher than the pier, serving as the construction protection platform.

[0059] It should be noted that 10 m upstream and downstream of the center of the bent column form a 20-m construction width; specifically during construction, this filling width can be adjusted according to the actual situation; the protective soil layer needs to be higher than the pier 2, preferably set at 0.5 m; for example, in Figure 1 the top width of the platform is 20000 mm and the thickness of the soil layer above the pier is 500 mm.

[0060] After the installation of the diversion pipe is completed, the cofferdam 4 can be backfilled.

[0061] The main body of the cofferdam 4 is generally made of clay or loam, which is a homogeneous cofferdam filled with excavated soil materials; use a 1-m 3 excavator for excavation and cooperate with a 15-t dump truck for transportation; during filling, start filling from one side of the diversion culvert, and compact the soil above the culvert densely, with the soil compaction degree ≥ 93%.

[0062] After the filling above the diversion culvert is completed, lower the other opened gates to use the gates as the cut-off walls of the upstream and downstream cofferdams 4; it can be understood that the gates at the installation position of the diversion culvert are not lowered.

[0063] After each hole gate is lowered, earth can be pushed from both sides of the sluice to fill the cofferdam 4; use a vibratory roller for layered compaction until it reaches the protective soil layer that is 0.5 m higher than the pier.

[0064] At this time, a cofferdam 4 that allows flow through the lower part has been formed on the river channel; for the demolition of the sluice, there is both a construction platform for dry-land operation and protection of the lower pier 2, bank slope, bottom slab, etc. from being damaged during demolition.

[0065] After the filling is completed, lay a layer of anti-seepage film 5 on both the upstream and downstream water faces.

[0066] In some embodiments, when laying the anti-seepage film 5, use gravity rolling paving.

[0067] Specifically, calculate the slope length and evenly wind the film around the steel pipe. For example, use a steel pipe with a diameter of DN150mm, a wall thickness of 10mm, and a length of 3m.

[0068] Tie ropes to both ends of the steel pipe to facilitate the recovery of the steel pipe. Roll and lay it to the toe of the slope of the cofferdam 4 by natural gravity sliding. Overlap 0.5m wide between two films, and use sandbags to roll and press them as they are rolled and laid to prevent the anti-seepage film 5 from floating and losing its anti-seepage function.

[0069] In some embodiments, in step S4: Rotate and arrange two collar rings at both ends of the steel pipe, and tie the ropes to the collar rings to reduce the entanglement of the ropes.

[0070] S3, demolish the upper building structure:

[0071] Use a hydraulic crusher to demolish the upper building structure 1, and transport it away as it is demolished until the demolition is completed.

[0072] S4, demolish the cofferdam 4 and the diversion culvert:

[0073] Demolish the cofferdam 4 in layers, lift out the diversion culvert, and wash the pier 2 and the slope protection to complete the demolition task.

[0074] The present invention is applicable to the demolition and renovation of the upper gate houses of various river-blocking gates, check gates, diversion gates, drainage gates, tide gates, flood-diversion gates, sewage gates, etc. under the condition that the river is not cut off. It provides protection for the piers, bottom slabs, etc. of the lower structure while creating a dry-land operation environment, facilitating mechanized demolition and slag removal.

[0075] In the present invention, on the basis of eliminating the hidden dangers of the sluice, the original sluice engineering facilities are reasonably and effectively utilized, the construction quality of the renovation is effectively improved, and the engineering function and appearance image of the sluice are enhanced.

[0076] In the present invention, the construction period is selected with a good construction foundation; the diversion culvert is constructed and can be recycled; earth is pushed and filled on both sides of the sluice to form a cofferdam as a construction platform to create a dry-land operation environment; it provides a good construction space and reduces the construction risk; at the same time, the lower structure is protected inside the cofferdam to reduce the impact during the demolition of the upper building, and has a good protection effect.

[0077] In the present invention, the construction process is simple. Under the condition of not cutting off the flow and not increasing the cost of additional diversion measures, it not only provides effective protection for the reserved structure below, but also creates the conditions for dry-land operation, effectively reducing the difficulty of demolition operations and the safety risks brought by demolition.

[0078] As described above, it is only the preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered within the protection scope of the present invention.

[0079] In the description of this specification, the description referring to terms such as "an embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0080] Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention.

Claims

1. Construction method for protecting the lower pier structure during the demolition and reconstruction of the upper building of the Laozha, characterized in that, It includes the following steps: S1, Construction diversion culvert: Install a concrete pipe that meets the requirements of regulating the water levels upstream and downstream in one hole of the outermost side span for diversion; S2, Construction of the protective platform: Push soil from both sides of the sluice to fill the cofferdam until it reaches the protective soil layer higher than the pier to serve as the construction platform; S3, Demolition of the upper building structure: Use a hydraulic crusher for demolition and transport the demolished materials immediately until the demolition is completed; S4, Demolition of the cofferdam and diversion culvert: Demolish the cofferdam in layers, lift out the diversion culvert, wash the pier and slope protection to complete the demolition task.

2. The protective construction method for the lower pier structure during the demolition and reconstruction of the upper building of the old sluice according to claim 1, characterized in that, It also includes: Construction period selection: Construct during the non-flood season.

3. The protective construction method for the lower pier structure during the demolition and reconstruction of the upper building of the old sluice according to claim 1, characterized in that, In step S1: Calculate the flow in the river channel according to the flood results in the designed river channel and the actual site conditions, install a socketed concrete pipe for diversion.

4. The construction method for protecting the lower pier structure during the demolition and reconstruction of the upper building of the old sluice according to claim 1, characterized in that, In step S1: When installing the concrete pipe, open other gates to keep the gates in the flowing state to reduce the drowning risk brought during the installation of the concrete diversion pipe.

5. The protective construction method for the lower pier structure during the demolition and reconstruction of the upper building of the old sluice according to claim 1, characterized in that, In step S1: Build temporary cofferdams on both the upstream and downstream of the gate hole where the concrete pipe is installed, pump out the accumulated water in the cofferdam to ensure dry construction for the diversion pipe; The installation length of the diversion pipe is calculated according to the width, height and slope ratio of the fill above.

6. The protective construction method for the lower pier structure during the demolition and reconstruction of the upper housing of the old sluice according to claim 1, characterized in that, In step S2: Push soil from both sides of the sluice to fill the cofferdam with a slope ratio of 1:2 for the upstream and downstream 10m centered on the bent column, and fill it to the protective soil layer 0.5m higher than the pier to serve as the construction platform.

7. The protective construction method for the lower pier structure during the demolition and reconstruction of the upper building of the old sluice according to claim 1, characterized in that, In step S2: After the filling above the diversion culvert is completed, lower the opened gate to use the gate as the anti-seepage wall of the upstream and downstream cofferdams; after each gate is lowered, soil can be pushed from both sides of the sluice to fill the cofferdam; compact it in layers with a vibratory roller until it reaches the protective soil layer 0.5m higher than the pier.

8. The protective construction method for the lower pier structure during the demolition and reconstruction of the upper building of the old sluice according to claim 7, characterized in that, In step S2, it also includes: After the filling is completed, lay an anti-seepage film on both the upstream and downstream sides.

9. The protective construction method for the lower pier structure during the demolition and renovation of the upper building of the old sluice according to claim 8, characterized in that: When laying the anti-seepage film, use gravity rolling paving; Calculate the slope length, evenly wind the film around the steel pipe; tie ropes at both ends for easy recovery of the steel pipe; use gravity to naturally slide and roll it to the toe of the cofferdam slope; overlap 0.5m wide between two films and roll and press with soil bags while rolling.

10. The construction method for protecting the lower pier structure during the demolition and reconstruction of the upper building of the old sluice according to claim 9, characterized in that, In step S2: Rotate and install two collars at both ends of the steel pipe, and tie the ropes to the collars.

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