Construction method for building super-long special-shaped building on soft and long and narrow river beach land

Abstract

The invention relates to the technical field of special-purpose buildings or similar structures, and discloses a construction method for building an ultra-long special-shaped building on a soft, long and narrow river beach land, in the construction method, a soft soil layer on bed rock is completely replaced with lime soil, and a pile foundation is completely constructed by a socketed pile, so that the foundation is reliable; redundancy is set for frame columns, steel reinforced concrete beams are used as frame beams, compressive pre-stress is applied to floors, and super-long tower units are used, so that adverse effects caused by using socketed piles on fragile rock stratums are overcome; the tower is arranged to be in a broken line shape, the concave position of the broken line is filled with the podium building, and all the socketed piles are connected into a whole through the raft, so that the building is not prone to overturning, and the anti-seismic capacity is improved; after each layer is constructed from upstream to downstream, the next layer is constructed, and multi-point construction is forbidden, so that mutual interference of material transfer due to only one road is avoided; a drainage structure for a foundation pit and a building is prepared, and the drainage cost of the foundation pit is reduced. And all the points are combined, so that the construction is smoothly performed.

Description

Technical Field

[0001] The present invention relates to the technical field of special-purpose buildings or similar structures, and in particular to a construction method for building an extra-long special-shaped building on a soft and narrow river beach. Background Art

[0002] While intense geological activity, glacial activity, water erosion, and wind erosion have shaped magnificent landscapes, they have also inflicted significant additional damage. These activities have randomly altered the surface and even deeper strata in the local area and even in more distant areas, leaving behind rugged topography and extremely complex and harsh stress conditions on the foundations. This has made the construction of roads and permanent buildings extremely difficult, preventing the formation of permanent human settlements.

[0003] If a tourist attraction lacks good transportation and living conditions, even the most spectacular sights will be deserted. Transportation is relatively easy to address, as it doesn't require earthquake resistance or overturning resistance, but living conditions are much more difficult. Conversely, improving living conditions at a tourist attraction can significantly improve visitor experience, attendance, and spending.

[0004] Take waterfalls, for example. While they are a relatively monotonous sight, they are certainly spectacular, but visitors only have a few moments to appreciate their spectacle. After traveling a long way, they only get a few glimpses, and then nothing else to see. While there's much more to see at waterfalls, the rainbows created by the sunlight at certain times of day interacting with the waterfall's mist, the interplay of the waterfall with the sun, moon, stars, and clouds above, and the sensation of falling asleep to the roar of the waterfall all contribute to the scenic beauty of the area. However, these all require time, requiring a stay of at least a day and a night on the riverbank near the waterfall. However, standing under a mist swirling with mud, dust, and sand for a whole day and a night is unacceptable to most people. Therefore, it's necessary to construct viewing structures on the riverbank near the waterfall to provide visitors with good food and accommodation, improving the visitor experience while increasing attendance and revenue.

[0005] The waterfall is located in a river section with a large drop in height. The river also flows at a very high velocity, causing severe erosion and undercutting of the ground. This makes the riverbank very narrow, and the land available for constructing viewing structures is a long and narrow strip, a considerable portion of which is also part of the floodplain. This makes the construction of permanent structures in this area very difficult. Taking the Hukou Waterfall scenic area construction project involved in this invention as an example, based on actual geological survey, design, and construction experience, the construction of permanent structures on such a riverbank presents the following difficulties: 1. Weak foundation According to drilling revelations, the foundation soil of the site is mainly composed of recently accumulated miscellaneous fill (Q4ml), silt (Q4al+pl) and Permian (P) sedimentary rocks, and the rock types are mainly sandstone, muddy sandstone, mudstone, sandstone, etc.

[0006] Silt, as a bearing layer, not only causes uncontrollable settlement and deformation, preventing a secure bond with piles, but also poses a risk of liquefaction when submerged in water. Furthermore, argillaceous sandstone and mudstone have very low strength and are easily deformed or damaged (thus damaging piles on the bedrock or compressing or stretching the foundation). Given that silt, argillaceous sandstone, and mudstone are all inevitable river sediments, the problem of weak foundations is unavoidable whenever permanent structures are constructed on such riverbanks.

[0007] 2. Extremely easy to overturn and difficult to resist earthquakes Due to land restrictions, the building must be constructed in a very long strip, and the aspect ratio will far exceed the usual convention of 1.5:1. This makes it a seriously overlong type among "slab buildings" and prone to overturning along the short side. At the same time, the excessive aspect ratio makes the building's torsional stiffness and short side stiffness extremely poor, making it easy to collapse in an earthquake due to insufficient stiffness.

[0008] 3. Possible flooding It is difficult for buildings built on the river bank here to completely avoid the floodplain, resulting in flooding at the bottom of the buildings during flood season.

[0009] The above difficulties mainly affect the design stage of the building. However, even if these three problems are solved through clever design, applying the design to the actual construction site will still face more difficulties: 4. Difficulties in on-site material transfer and dispatch Due to the narrow site, it was impossible to add construction roads on site as needed like on conventional construction sites. There was only one usable construction road (parallel to the river) during the entire construction process. If one was not careful, the material transfer on site would interfere with each other. At the same time, the available storage yard on site was limited. After the basement construction was completed, some materials needed to be stored in the basement.

[0010] 5. The foundation will almost certainly be flooded during construction Since the excavation starting point of the construction site is not on the ground, but in a valley below the ground and next to a river, water will almost certainly enter the foundation pit during construction, and it cannot be blocked by a water-stop curtain (there is no space to install a water-stop curtain). There is no groundwater, so this paragraph can be deleted. Summary of the Invention

[0011] The invention provides a construction method for building an extra-long special-shaped building on a soft and narrow river beach.

[0012] The technical problem to be solved is: permanent buildings built on river banks with high flow rates to meet viewing needs face problems in the design phase, such as weak foundations, easy overturning, difficulty in earthquake resistance, and possible flooding; and in the construction phase, they face difficulties in on-site material transportation and scheduling, and the almost inevitable flooding of the foundation.

[0013] To solve the above technical problems, the present invention adopts the following technical solutions: a construction method for constructing an extra-long special-shaped building on a soft and narrow river beach, which is used to construct an extra-long special-shaped building on a narrow river beach with unstable soil. The tower and podium of the extra-long special-shaped building are both frame structures. The tower is in a broken line shape and extends along the river bank, and the podium fills the notch of the broken line. Each tower section is an integrated unit, and structural joints are provided between adjacent tower units. In each section of the tower units, they are arranged in order from top to bottom along the river flow direction, with the frontmost unit being the first unit, the backmost unit being the last unit, and the rest being the middle units. A skylight is opened in the middle of the last unit, and the last unit is expanded outward around the skylight to form a cylindrical structure. The construction method comprises the following steps: Step 1: Excavate the foundation pit to the bedrock and remove all the soil above the bedrock; Step 2: Backfill the soil and level and compact it; Step 3: Drive rock-socketed piles through the replacement soil and into the bedrock, and connect the caps on top of each rock-socketed pile with a raft slab; Step 4: Construct the main structure of the building layer by layer from bottom to top in the order of frame columns, frame beams, and reinforced concrete floor slabs until the roof is completed. During the construction process, each floor must be completed in one go from the first unit to the last unit. It is not allowed to start construction at multiple locations at the same time or in the opposite direction. Step 5: Apply a compressive prestress to the reinforced concrete floor slab of each tower unit, parallel to the extension direction of the tower unit, and apply a tensile prestress to the roof of the first unit, parallel to the extension direction of the tower unit; Step 6: Construct the outer enclosure structure of the building.

[0014] Furthermore, the following methods were used to reduce the excavation workload in step 1: during the geological survey, areas with thinner soil layers were selected as construction sites; The following methods are used to reduce the backfill workload in step 2: During the design process, set the basement with a total floor height as high as possible to minimize the distance between the basement floor and the bedrock.

[0015] Furthermore, the following methods are used to simultaneously solve the problems of water accumulation in the foundation pit during construction and water accumulation in the basement after construction is completed: During the excavation of the foundation pit, a concealed pipe is pre-buried from the position above the basement floor, penetrating the ground and leading downward into the river channel, and a pumping device is set up to pump out the accumulated water in the foundation pit below the basement floor.

[0016] Furthermore, the method of setting up an elevated floor is adopted to overcome the problem of river water flooding the bottom of the building. The elevated floor includes the first and second floors of the above-ground part of the building. The elevated floor is equipped with an enclosure structure that can resist flooding and does not block the view. All rooms on the elevated floor do not provide accommodation. The height of the elevated floor meets the following conditions: the ceiling of the first floor is higher than the highest water level of the river once in 50 years, and the ceiling of the second floor is higher than the historical highest water level of the river.

[0017] Furthermore, the reinforced concrete floor slab of the tower unit is provided with an expansion concrete reinforcement strip perpendicular to the extension direction of the tower unit section, which acts as a post-cast strip and applies compressive stress to the floor slab; In step 5, the prestress in the reinforced concrete floor slab is applied by the expansion concrete reinforcement strip, and the prestress in the roof of the first unit is applied using the following structure: The roof of the first unit is a sloping roof that slopes downward from the first unit toward the upstream of the river. The sloping roof is a steel structure roof supported by columns. Among the columns supporting the sloping roof, the columns located at the bottom of the sloping roof are inclined columns made of reinforced concrete, and the tops of the inclined columns are inclined toward the upstream of the river.

[0018] Furthermore, each of the tower units is an extra-long structure, the frame beams are steel-concrete beams, and the frame columns meet the following conditions: Condition 1: If any frame column is removed, the vertical load borne by the removed frame column will be transferred to other adjacent frame columns without causing damage; Condition 2: Remove any frame column, and add a horizontal load equal to the deadweight of the removed frame column to the horizontal load borne by the removed frame column, which will not cause damage to other adjacent frame columns.

[0019] Furthermore, the rock-socketed piles are rotary bored cast-in-place piles with their lower ends embedded in bedrock, and during the construction of the rock-socketed piles, the first unit of rock-socketed piles is constructed first, followed by the last unit of rock-socketed piles, and finally the remaining rock-socketed piles.

[0020] Compared with the prior art, the construction method of the present invention for constructing an extra-long special-shaped building on a soft and narrow river beach has the following beneficial effects: In the present invention, the weak soil layer on the foundation rock of the soft and narrow riverbed is completely removed and replaced with lime soil (a mixture of lime and soil). The pile foundation is constructed entirely with rock-embedded piles, so that the foundation is solid and will not sink or liquefy even in flooding or earthquakes. The piles are completely unaffected by the state of the soil layer. By providing redundancy in the frame columns (so that the collapse of a portion will not affect the load-bearing capacity), using steel-concrete beams as frame beams (to prevent the frame beams from breaking after some frame columns collapse, and can also be replaced with steel beams), applying pre-compressive stress to the floor slabs (to prevent them from being cracked), and using extra-long tower units (to ensure that each frame column is connected to a sufficient number of other frame columns via frame beams), even if some frame columns collapse due to localized failure of the rock strata (mudstone is very brittle), a new stable load-bearing structure will be formed, and the earthquake resistance of the building will not be affected by the pile foundation constructed entirely of rock-embedded piles; By completely relying on frame columns as the supporting structure, the floor height can be freely set, allowing the lower floors that are prone to flooding to be set to a large floor height (equivalent to the upper floors being elevated), thus preventing flooding from affecting the use of the building; By designing the tower of the building in a broken line shape and filling the podium in the concave part of the broken line, the aspect ratio of the foundation and the overall aspect ratio of the building are greatly reduced without changing the actual length of the tower. This significantly improves the building's stiffness and torsional stiffness in the short direction. All rock-embedded piles are connected together by a raft slab, so that the overturning process of the building is not affected by all the rock-embedded piles, making the building less likely to overturn and improving its earthquake resistance. By using a prestressed slope roof in the first unit, the deformation of the foundation under the first unit (the rock and soil in the upstream direction slides / compresses, causing the foundation at that location to be compressed) will not cause the roof to deflect downward, and the last unit is constructed into a cylindrical shape, so that the deformation of the foundation under the terminal element (the rock and soil in the downstream direction slides / compresses, causing the foundation at that location to be stretched) will not affect the stability of the terminal element.

[0021] The combination of the above points overcomes the problems of weak foundation, easy overturning, difficulty in earthquake resistance and possible flooding when constructing permanent buildings on narrow riverbeds.

[0022] By adjusting the construction sequence of each layer, it is ensured that each layer is constructed from the upstream to the downstream of the river, and multi-point construction is prohibited, so that the material transfer will not interfere with each other due to there being only one road; it will also prevent the negative impact of slipping vehicles, and the problem of lack of storage yard can be solved by using the upstream road as a storage yard.

[0023] By setting up a basement with a total floor height as high as possible, the basement floor is close to the bedrock, and a gravity drainage structure is prepared during the construction phase to drain the building during and after construction. This allows the basement's gravity drainage structure to play a role in advance during the construction process (the basement floor is close to the bottom of the foundation pit, and its gravity drainage structure can drain most of the water in the foundation pit. The remaining water only needs a small amount of pumping equipment to pump out). The combination of the two overcomes the problem of water accumulation in the foundation pit during construction without significantly increasing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a flow chart of a construction method for constructing an extra-long special-shaped building on a soft and narrow river beach according to the present invention; Figure 2 This is a schematic diagram of the structure of the super-long special-shaped building in the present invention. Figure 1 , the left side of the figure is the upstream direction of the river, and the right side is the downstream direction of the river, the same below; Figure 3 This is a schematic diagram of the structure of the super-long special-shaped building in the present invention. Figure 2 ,The perspective in the figure is a bird's-eye view; Figure 4 This is a structural diagram of the sloped roof and inclined columns; Figure 5 The construction site outline and pile position diagram of the construction method of the present invention for constructing an extra-long special-shaped building on a soft and narrow river beach; In the figure, 11-first unit, 12-last unit, 13-middle unit, 2-podium, 3-rock-embedded piles, 4-frame column, 5-sloping roof, 6-slanted column. DETAILED DESCRIPTION

[0025] In view of the lack of a clear definition of riverbank, the riverbank in this paper refers to the area between the natural levee of the river and the valley slope.

[0026] like Figure 1-3 As shown, taking the Hukou Waterfall Scenic Area construction project to which the present invention is applied as an example, a construction method for creating an extra-long special-shaped building on a soft and narrow river beach is used to adapt to the narrow river beach with unstable soil layers. The tower and the podium 2 of the extra-long special-shaped building are both frame structures. The tower is in a broken line shape and extends along the river bank, and the podium 2 fills the recess of the broken line; each section of the tower is an integrated unit, and structural seams are set between adjacent tower units; the purpose of this is to reduce the length-to-width ratio of the foundation and the length-to-width ratio of the entire building without changing the actual length of the tower, thereby improving the stiffness and torsional stiffness of the building in the short direction.

[0027] The tower units in each section are arranged in order from top to bottom along the river flow direction. The front unit is recorded as the first unit 11, the back unit is recorded as the last unit 12, and the rest are recorded as the middle units 13. A skylight is opened in the middle of the last unit 12, and the last unit 12 is expanded outward around the skylight to form a cylindrical structure. The construction method includes the following steps: Step 1: Excavate the foundation pit to the bedrock and remove all the soil above the bedrock; Step 2: Backfill the lime soil and level and compact it; in this embodiment, the lime soil is 37 lime soil (a mixture of 3 parts by mass of lime and 7 parts by mass of soil).

[0028] Step 3: Driving rock-socketed piles 3 through the replacement soil into the bedrock, and connecting the caps on the tops of the rock-socketed piles 3 with a raft slab; Here, a raft foundation is used, and the raft foundations of each tower unit and the podium 2 are connected as a whole. The overturning process of the building is interfered by all the rock-embedded piles 3, making the building less likely to overturn.

[0029] Step 4: Construct the main structure of the building layer by layer from bottom to top in the order of frame column 4 - frame beam - reinforced concrete floor slab until the roof is completed. During the construction process, each floor is completed at one time in the construction direction from the first unit 11 to the last unit 12. It is not allowed to start construction at multiple locations at the same time or in the opposite direction. Step 5: Applying a compressive prestress parallel to the extension direction of the tower unit to the reinforced concrete floor slab of each tower unit, and applying a tensile prestress parallel to the extension direction of the tower unit to the roof of the first unit 11; For buildings on soft and narrow riverbeds, in addition to the influence of the strata below the building, the influence of the strata in the upstream and downstream directions of the river must also be considered (the bedrock strength is low and the soil is weak). The strata in the upstream direction tend to slide / compress downward, and even if there is a retaining wall, it cannot be completely avoided. The foundation of the first unit 11 will be shortened, causing the roof to sag downward. Here, the roof is prestressed in advance to offset the tendency of the roof to shorten. The strata in the downstream direction tend to slide / compress downward, causing the foundation of the last unit 12 to be stretched. The last unit 12 needs to resist this stretching. Prestressed compression in the floor slab in advance can offset this stretching to a certain extent, but this is not enough. Therefore, the present invention makes the last unit 12 into a cylindrical shape, which can not only better resist stretching, but also will not be distorted due to foundation stretching. The present invention does not have a special prestressed structure such as a prestressed cable, but rather fine-tunes the form of part of the building structure to apply prestress.

[0030] Step 6: Construct the outer enclosure structure of the building (i.e. non-load-bearing walls). During the construction of the enclosure structure, a floor can be reserved under the building to resist water damage and recorded as an elevated floor.

[0031] The elevated floor here is designed with a larger floor height and a flood-resistant enclosure structure. The decoration must also meet flood-resistant requirements. At the same time, metal parts must be rust-proof and the use of foam materials should be avoided.

[0032] The following methods can be used to reduce the excavation workload in step one: during the geological survey, select areas with thinner soil layers as construction sites; the following methods can be used to reduce the backfill workload in step two: during the design process, set the basement with the highest possible total floor height to minimize the distance between the basement floor and the bedrock.

[0033] Conventional wisdom suggests that removing all the soil from the bedrock and replacing it with more solid ash soil would be a nearly impossible task. However, in actual construction, this approach has proven feasible. Furthermore, through appropriate design adjustments, the overall backfilling effort can be minimized. Specifically, the soil layer on the riverbank is essentially entirely sediment. Due to uneven water erosion and sedimentation, some areas have significantly thinner soil layers. Excavating these areas significantly reduces the amount of excavation work. Furthermore, by forcing the construction of an unnecessary basement (this area is prone to flooding and is not suitable for a basement, so in this example, a two-story basement is constructed, with a -2 floor height of 3.6m and a -1 floor height of 4.74m and 4.54m), the backfilling effort can be significantly reduced. In this example, the ash soil is not the same thickness as the removed soil; in fact, the thickest point is only 2.1 meters, and the thinnest is only 0.5 meters. This uneven thickness ensures a flat site, as the bedrock surface is uneven.

[0034] In this example, prior exploration indicated that there was no immediate risk of flooding during construction. However, a drainage plan was prepared. To avoid waste, the drainage structure in the plan should be dual-purpose, that is, it can be used both during and after construction. The following is a good solution (very low cost and good drainage effect), which can simultaneously solve the problems of water accumulation in the foundation pit during construction and water accumulation in the basement after construction is completed: During the excavation of the foundation pit, a concealed pipe is pre-buried from the position above the basement floor, penetrating the ground and leading downward into the river channel, and a pumping device is set up to pump out the accumulated water in the foundation pit below the basement floor.

[0035] Because it is close to the river, even if the basement is flooded, it can be drained by gravity through a siphon or a concealed pipe (the basement floor is actually higher than the riverbed, and whether a concealed pipe leading to the river is drilled through the ground or a siphon leading to the river is led from the basement floor, gravity drainage can be used), and the accumulated water can be removed quickly and at low cost.

[0036] If the method of setting up an elevated floor is used to overcome the problem of river water flooding the bottom of the building, the elevated floor includes the first and second floors of the building above ground. The elevated floor is equipped with a protective structure that can resist flooding and does not block the view (such as glass curtain walls and guardrails), and all rooms on the elevated floor do not provide accommodation; No accommodation is provided, that is, no one is allowed to sleep on these floors, no one can be left unconscious on the first and second floors unattended, and sleeping is only allowed on floors that are completely protected from flooding.

[0037] The height of the mezzanine floor meets the following conditions: the ceiling of the first floor is higher than the highest water level of the river in 50 years, and the ceiling of the second floor is higher than the historical highest water level of the river.

[0038] Because the building is entirely supported by frame columns 4, the building's floor height can be freely set. In this embodiment, the ground floor is 5.4m high, the second floor is 5.74m high, the third to fourth floors are 3.9m high, and the fifth floor is 3.92m high. The first and second floors, which are significantly higher, have essentially no other structure other than the frame columns 4, making the main part of the building a stilt house, thus preventing flooding. The first and second floors also offer excellent views and can be used for viewing. Generally speaking, the height of the first floor should ensure that the river does not flood the second floor during flooding, while the height of the second floor should ensure that the river does not flood the third floor at the highest possible water level.

[0039] The tower unit's reinforced concrete floor slabs incorporate expansive concrete reinforcement strips, running perpendicular to the tower unit's extension direction. These strips act as post-cast strips and apply compressive stress to the slabs. In step five, the prestress within the reinforced concrete floor slabs is applied by the expansive concrete reinforcement strips. While these strips are designed to offset shrinkage stress during the concrete curing process, they are also used here to apply prestress. The density and expansion rate of the concrete are higher than those typically found in conventional construction. The specific design should be tailored to the requirements of the load calculation.

[0040] like Figure 4 As shown, the prestress in the roof of the first unit 11 is applied using the following structure: The roof of the first unit 11 is a sloping roof 5 that slopes downward from the first unit 11 toward the upstream of the river. The sloping roof 5 is a steel structure roof supported by columns. Among the columns supporting the sloping roof 5, the column located at the bottom of the sloping roof 5 is a reinforced concrete (heavier) inclined column 6, and the top of the inclined column 6 is inclined toward the upstream of the river.

[0041] The amount of prestressing applied to the roof of unit 11 is difficult to determine because foundation deformation is a dynamic process. Therefore, conventional prestressing methods cannot be used. Using inclined columns 6 and a sloping roof to apply prestress not only allows for dynamic adjustment but also prevents the effect from fading over time. (Here, the prestress is applied by gravity, so even foundation compression does not affect the prestress, a problem that conventional prestressing methods cannot overcome.)

[0042] Each tower unit is an extra-long structure, the frame beam is a steel-concrete beam, and the frame column 4 meets the following conditions: Condition 1: When any frame column 4 is removed, the vertical load borne by the removed frame column 4 is transferred to other adjacent frame columns 4 without causing damage; Condition 2: Remove any frame column 4, and add a horizontal load equal to the deadweight of the removed frame column 4 to the horizontal load borne by the removed frame column 4, which will not cause damage to other adjacent frame columns 4.

[0043] In the present invention, the pile foundation is constructed entirely of rock-socketed piles 3, which has potential side effects: in the application scenario of the present invention, the bedrock is relatively brittle and may be locally damaged during an earthquake, thereby causing some rock-socketed piles 3 to be damaged and the frame columns 4 above the rock-socketed piles 3 to collapse. The following solution is used here to overcome this side effect: By providing redundancy to the frame columns 4 (collapse of a portion does not affect the load bearing capacity), using integral steel-concrete beams as frame beams (steel-concrete beams have high rigidity and will not break after the collapse of a portion of the frame columns 4. Parts with low rigidity requirements can also be replaced with steel beams, and if a frame beam does not have a risk of breaking, it can also be replaced with concrete beams), applying pre-compressive stress to the floor slabs (to prevent them from being torn), and using extra-long tower units (extra-long in architecture generally refers to the spacing between adjacent structural joints exceeding 55 meters, which is usually avoided. Here, it is used to ensure that each frame column 4 is connected to a sufficient number of other frame columns 4 around it through frame beams), even if some frame columns 4 collapse due to local damage to the rock stratum, the load will be redistributed to form a new stable load-bearing structure, and the earthquake resistance of the building will not be affected by the pile foundation constructed entirely of rock-embedded piles 3. At the same time, the problem caused by the phase difference of the seismic waves at both ends of the building due to the excessive length of the building is that the local irregular vibration is easy to cause local collapse, but the structure of the present invention itself is not afraid of local collapse, so this extra-long structure can be used. Note that if a frame column 4 is vulnerable, it can also be replaced with a steel-concrete column.

[0044] like Figure 5 As shown, the rock-socketed piles 3 are bored cast-in-place piles with their lower ends embedded in the bedrock. The caps on the tops of the rock-socketed piles 3 are connected together by a raft slab. During the construction of the rock-socketed piles 3, the rock-socketed piles 3 of the first unit 11 are constructed first, followed by the rock-socketed piles 3 of the last unit 12, and finally the remaining rock-socketed piles 3. This is to overcome the impact of foundation deformation during the piling process on construction.

[0045] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. A construction method for constructing an extra-long, special-shaped building on a soft, narrow river beach, which is used to construct an extra-long, special-shaped building on a narrow river beach with unstable soil layers, characterized by: The tower and the podium (2) of the super-long special-shaped building are both frame structures. The tower is in a broken line shape and extends along the river bank, and the podium (2) is filled in the notch of the broken line. Each section of the tower is an integrated unit, and structural seams are provided between adjacent tower units. The tower units of each section are arranged in order from top to bottom along the river flow direction, with the frontmost unit being the first unit (11), the rearmost unit being the last unit (12), and the rest being the middle units (13). A skylight is opened in the middle of the last unit (12), and the last unit (12) is expanded outward around the skylight to form a cylindrical structure. The construction method comprises the following steps: Step 1: Excavate the foundation pit to the bedrock and remove all the soil above the bedrock; Step 2: Backfill the soil and level and compact it; Step 3: Driving rock-embedded piles (3) through the replacement soil and into the bedrock, and connecting the caps on the tops of the rock-embedded piles (3) with a raft plate; Step 4: Construct the main structure of the building layer by layer from bottom to top in the order of frame column (4) - frame beam - reinforced concrete floor slab until the roof is completed. During the construction process, each floor is completed in one go in the direction from the first unit (11) to the last unit (12). It is not allowed to start construction at multiple locations at the same time or in the opposite direction. Step 5: applying a prestress of compressive stress parallel to the extension direction of the tower unit to the reinforced concrete floor slab of each tower unit, and applying a prestress of tensile stress parallel to the extension direction of the tower unit to the roof of the first unit (11); Step 6: Construct the outer enclosure structure of the building.

2. The construction method for constructing an extra-long special-shaped building on a soft and narrow river beach according to claim 1, characterized in that: The following methods were used to reduce the amount of excavation work in step 1: during the geological survey, areas with thinner soil layers were selected as construction sites; The following methods are used to reduce the backfill workload in step 2: During the design process, set the basement with a total floor height as high as possible to minimize the distance between the basement floor and the bedrock.

3. The construction method for constructing an extra-long special-shaped building on a soft and narrow river beach according to claim 2, characterized in that: The following methods are used to solve the problem of water accumulation in the foundation pit during construction and water accumulation in the basement after construction is completed: During the excavation of the foundation pit, a concealed pipe is pre-buried from the position above the basement floor, penetrating the ground and leading downward into the river channel, and a pumping device is set up to pump out the accumulated water in the foundation pit below the basement floor.

4. The construction method for constructing an extra-long special-shaped building on a soft and narrow river beach according to claim 1, characterized in that: The problem of river water flooding the bottom of the building is overcome by setting up an elevated floor. The elevated floor includes the first and second floors of the building. A protective structure that can resist flooding and does not block the view is set up on the elevated floor. All rooms on the elevated floor do not provide accommodation. The height of the elevated floor meets the following conditions: the ceiling of the first floor is higher than the highest water level of the river once in 50 years, and the ceiling of the second floor is higher than the historical highest water level of the river.

5. The construction method for constructing an extra-long special-shaped building on a soft and narrow river beach according to claim 1, characterized in that: The reinforced concrete floor slab of the tower unit is provided with an expansion concrete reinforcement strip perpendicular to the extension direction of the tower unit section, which acts as a post-cast strip and applies compressive stress to the floor slab; In step 5, the prestress in the reinforced concrete floor slab is applied by the expansion concrete reinforcement strip, and the prestress in the roof of the first unit (11) is applied by the following structure: The roof of the first unit (11) is a sloping roof (5) that slopes downward from the first unit (11) toward the upstream direction of the river. The sloping roof (5) is a steel structure roof supported by columns. Among the columns supporting the sloping roof (5), the column located at the bottom of the sloping roof (5) is a reinforced concrete inclined column (6), and the top of the inclined column (6) is inclined toward the upstream direction of the river.

6. The construction method for constructing an extra-long special-shaped building on a soft and narrow river beach according to claim 1, characterized in that: Each of the tower units is an ultra-long structure, the frame beam is a steel-concrete beam, and the frame column (4) meets the following conditions: Condition 1: When any frame column (4) is removed, the vertical load borne by the removed frame column (4) is transferred to other adjacent frame columns (4) without causing damage; Condition 2: Remove any frame column (4), and add a horizontal load equal to the self-weight of the removed frame column (4) to the horizontal load borne by the removed frame column (4), and apply it to other adjacent frame columns (4) without causing damage.

7. The construction method for constructing an extra-long special-shaped building on a soft and narrow river beach according to claim 1, characterized in that: The rock-socketed piles (3) are rotary bored cast-in-place piles with their lower ends embedded in bedrock, and during the construction process of the rock-socketed piles (3), the rock-socketed piles (3) of the first unit (11) are constructed first, then the rock-socketed piles (3) of the last unit (12) are constructed, and finally the remaining rock-socketed piles (3) are constructed.

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