Traffic relief method for sunken square under high fall condition
Through the cover excavation reverse operation and zoning construction, combined with the grading slope and the Yonglin combination process, the efficiency and safety problems of traffic relief under high drop conditions are solved, and efficient construction of the sinking square structure is achieved, ensuring construction efficiency and traffic Pass.
Patent Information
- Application Number
- CN202411329438.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-23
- Publication Date
- 2024-12-13
AI Technical Summary
Under high drop conditions, traditional traffic relief methods cannot effectively complete construction, resulting in delays in construction periods and traffic congestion, and cannot meet the complex subway station construction needs.
The construction method is carried out by the cover excavation method, and priority is given to the construction of the north-side ground connection wall and steel pipe column of the traffic relief section. Combined with zoning construction, graded slope excavation, precipitation treatment and Yonglin combination technology, a sunroof is formed in the sinking square and the construction process is arranged reasonably , ensure the passage of traffic relief roads, and use permanent and temporary retaining walls to construct in sections.
It improves construction efficiency, shortens construction period, ensures construction safety and traffic relief effect, avoids construction period delays and traffic congestion problems, and achieves efficient construction of sinking square structures.
Smart Images
Figure CN119122003A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of transportation hub construction, and in particular to a traffic relief method with a sunken square under high-drop conditions. Background Art
[0002] Urban rail transit lines are usually laid out along passenger transportation corridors and main traffic roads, passing through the city center. During construction, they need to occupy busy main roads and some land along the lines. Therefore, subway construction often requires the occupation of more of the already tight urban road resources. In order to reduce the impact on existing roads, it is required to design an optimized construction plan to occupy as little road as possible, but it should also ensure that the site requirements for normal construction are met, and the land required for construction safety, construction quality and construction efficiency is ensured.
[0003] The construction of subway stations occupies the road surface, which is usually limited to a single road trunk line. The impact of traffic diversion is relatively small. Vehicles and pedestrians are diverted and diverted through enclosures, and the road rights are redistributed. When the road space is large, the construction area in the middle of the road is fenced, and the traffic flows around the outside of the construction area to ensure traffic; when the road space is insufficient, half of the road surface is fenced in stages, and the traffic flows through the construction area on one side in both directions to ensure traffic. At present, sunken squares are often used for commercial purposes in the main structure of subway stations. For high-drop three-dimensional transportation systems with complex working conditions and multi-line convergence, the operating traffic volume in the area is large. Therefore, the single line occupation and enclosure diversion in the traditional traffic diversion construction method cannot achieve the effect of efficiently completing on-site traffic diversion without affecting the construction period. Therefore, in view of the above situation, it is urgent to develop a traffic diversion method with sunken squares under high drop conditions to overcome the shortcomings in current practical applications. Summary of the invention
[0004] The purpose of the present invention is to provide a traffic relief method with a sunken plaza under high-drop conditions to solve the problems raised in the above-mentioned background technology.
[0005] To achieve the above object, the present invention provides the following technical solutions: A method for traffic relief with a sunken square under high drop conditions, comprising the following steps: Step 1: Determine the foundation pit excavation method and the division of labor in each area; Step 2: Complete the construction of the side ground connection wall and steel pipe column, and construct the cap beam and retaining wall; Step 3: Arrange drainage wells. Set up drainage ditches and sump pits around or in the middle of the excavated foundation pit to collect seepage water and construction wastewater in the foundation pit. Then, use water pumps to pump water into the surface sedimentation tank for sedimentation and then discharge it into the municipal drainage system to complete the precipitation in the pit. At the same time, in order to prevent surface water from flowing into the foundation pit, set up water interception outside the pit. Step 4: Slope excavation; Step 5: Ground-connected wall base surface treatment and cushion pouring; Step 6: Construction of the structural cover plate of the relief section. With the horizontal center of the station as the boundary, the cover plate is cast symmetrically from both sides to the center in sequence, and a combination of permanent and temporary technology is adopted. The top plate of the sunken square section needs to be removed after the overall construction of the foundation pit is completed to form a sunken square skylight; Step 7: Tie and pour the steel bars of the retaining wall on the top plate; Step 8: Repeat the above construction steps to complete the construction of the top plate and retaining wall of the high drop section to achieve the connection of each segmented area; Step 9: Backfill the roadbed and build fences to complete the traffic relief in this section; Step 10. After the main structure of the foundation pit is completed, the excavation outlet is sealed, the road enclosure is removed, and normal road traffic is restored. The upper relief section of the original sunken square is demolished, the top plate and temporary retaining wall here are broken down, and the relief section on the north side remains as it is, completing the construction of the sunken square structure section.
[0006] As a further solution of the present invention: In step one, the specific steps for determining the foundation pit excavation method and the division of labor in each area are as follows: Before construction, explore the geological conditions on site, determine the distribution of each rock layer, understand the construction content and design intention, and reasonably optimize the construction design plan on the premise of meeting relevant specifications, and plan the scale and regional division of traffic relief roads according to actual traffic needs and construction difficulty. Taking the foundation pit with the north-south direction as the short axis and the east-west direction as the long axis as an example, the foundation pit is divided into two areas in the north and south, and the north side is planned as a traffic relief road. According to the construction method of the main structure of the cover excavation and reverse construction, the cover excavation top plate is used as the traffic relief road, and the construction of the north side retaining structure and steel pipe columns is completed first. The construction process is reasonably arranged to minimize the occupation of other traffic routes for traffic relief.
[0007] As a further solution of the present invention: in step 2, a crown beam is set on the top of the underground continuous wall of the retaining structure to connect each wall into a whole, the floating slurry part of the pile (wall) top of the retaining structure is manually chiseled out, the concrete on the pile (wall) top is broken, and the anchor steel bars on the underground pile top are straightened. The crown beam and waist beam are constructed by on-site binding of steel bars, bamboo plywood + rib wood formwork on the inner side of the foundation pit (the soil side wall reinforced with a water-stop curtain on the other side is used as the outer formwork), and commercial concrete is poured into the formwork; after the concrete pouring and maintenance are completed, the retaining wall is arranged along the crown beam, 0.5m above the ground, 0.2m wide, and C30 concrete is poured.
[0008] As a further solution of the present invention: in step four, the specific steps of slope cutting and excavation are as follows: the bottom elevation of the north slope is consistent with the crown beam elevation, the top of the slope is consistent with the field elevation, the slope width is determined according to the 1:1 slope cutting, and an excavator is used to dig the north side soil to form a slope; the longitudinal slopes on both sides are consistent with the north slope and are sloped according to the 1:1 ratio, and the south slope is excavated according to the 0.5:1 ratio; in places with large terrain differences, multi-level slope cutting is used to alleviate the terrain difference and reduce the slope.
[0009] As a further scheme of the present invention: In step five, the specific steps of treating the base surface of the ground-anchored wall and pouring the cushion layer are as follows: the base surface of the retaining structure is excavated and chiseled while the foundation pit is excavated, and the rough surface with a bump of not less than 20 mm is roughened by a milling machine, and the ground-anchored wall is chiseled from the top elevation of the top plate to the bottom of the foundation pit to the reserved steel plate position by a drilling rig; the cushion layer is constructed from the earth excavation to the bottom elevation of the structure cover plate to form a uniformly stressed construction platform.
[0010] As a further solution of the present invention: In step seven, the specific steps of tying and pouring the steel bars of the retaining wall on the top plate are as follows: according to the reserved connector on the upper part of the top plate, the steel bars are connected according to the retaining wall drawing, the steel bars are tied and formed, and steel brackets are set up outside to support the retaining wall steel cage, and connectors are reserved on the top of the retaining wall; the top plate section of the sunken square is used as the boundary area, and the northern half is planned as the relief section, then a permanent retaining wall is set up on the north side of the sunken square, and a temporary retaining wall is set up on the south side to meet the traffic relief needs, and the upper temporary retaining wall is demolished while the cover plate of the subsequent sunken square section area is broken.
[0011] As a further solution of the present invention: in step nine, after the construction of the top plate and the retaining wall is completed, the roadbed is backfilled to the elevation of the top of the crown beam of the ground-connected wall, the roadbed is compacted, and the road is formed after pouring concrete, completing the traffic relief construction of the sunken square section.
[0012] Compared with the prior art, the present invention has the following beneficial effects: This application firstly adopts the cover-excavation reverse construction method to construct the foundation pit, giving priority to the construction of the ground-connected wall and steel pipe columns on the north side of the traffic relief section. The cover-excavation top plate is the subsequent sunken square top plate and also serves as the bearing structure of the relief section. The reasonable construction process and construction arrangement solve the construction period delay and traffic congestion problems caused by multi-line traffic relief, and improve the construction efficiency; secondly, slope excavation is adopted to connect the terrain difference, with a 1:1 slope in the longitudinal direction and a 1:0.5 slope excavation in the south. At the same time, soil nail walls and mesh sprayed concrete surface layers are evenly arranged on the slope to reduce the vertical Straightness can be improved, slope stability can be improved, and safety during construction can be further improved; finally, through the combination of permanent and temporary, permanent retaining walls and temporary retaining walls are constructed. After the roadbed is backfilled, the upper part of the retaining wall forms a traffic relief road to ensure normal construction of the south side site. The temporary retaining wall and the top plate between the two retaining walls will be removed after the traffic relief is completed, and the sunken square skylight will be constructed. The permanent retaining wall begins to assume the retaining function. This method is constructed in multiple areas and blocks and time periods, which efficiently connects each construction section, improves construction efficiency, and can effectively shorten the construction period. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 This is a flow chart of the traffic relief method with a sunken square under high drop conditions. DETAILED DESCRIPTION
[0014] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.
[0015] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.
[0016] See also Figure 1 In one embodiment of the present invention, a method for traffic relief with a sunken square under high drop conditions comprises the following steps: Step 1: Determine the foundation pit excavation method and the division of labor in each area; Step 2: Complete the construction of the side ground connection wall and steel pipe column, and construct the cap beam and retaining wall; Step 3: Arrange drainage wells. Set up drainage ditches and sump pits around or in the middle of the excavated foundation pit to collect seepage water and construction wastewater in the foundation pit. Then, use water pumps to pump water into the surface sedimentation tank for sedimentation and then discharge it into the municipal drainage system to complete the precipitation in the pit. At the same time, in order to prevent surface water from flowing into the foundation pit, set up water interception outside the pit. Step 4: Slope excavation; Step 5: Ground-connected wall base surface treatment and cushion pouring; Step 6: Construction of the structural cover plate of the relief section. With the horizontal center of the station as the boundary, the cover plate is cast symmetrically from both sides to the center in sequence, and a combination of permanent and temporary technology is adopted. The top plate of the sunken square section needs to be removed after the overall construction of the foundation pit is completed to form a sunken square skylight; Step 7: Tie and pour the steel bars of the retaining wall on the top plate; Step 8: Repeat the above construction steps to complete the construction of the top plate and retaining wall of the high drop section to achieve the connection of each segmented area; Step 9: Backfill the roadbed and build fences to complete the traffic relief in this section; Step 10. After the main structure of the foundation pit is completed, the excavation outlet is sealed, the road enclosure is removed, and normal road traffic is restored. The upper relief section of the original sunken square is demolished, the top plate and temporary retaining wall here are broken down, and the relief section on the north side remains as it is, completing the construction of the sunken square structure section.
[0017] In this embodiment, the present application aims at the construction of traffic relief with a sunken square where multiple lines converge, takes into account the east-west terrain difference and the construction of the sunken square, adopts the cover-excavation reverse construction method in accordance with local conditions, combines zoning construction and reasonably arranges the work procedures, constructs the north side retaining structure and steel pipe columns, excavates with graded slopes, excavates the foundation pit for dewatering, constructs the top plate, casts the retaining wall, backfills the roadbed to construct the traffic relief pavement structure, and finally ensures that the south side site can be constructed normally. The temporary retaining wall and the top plate between the two retaining walls are removed after the traffic relief is completed, the sunken square skylight is constructed, and the permanent retaining wall begins to assume the retaining function. Construction is carried out in multiple areas in blocks and time periods, efficiently connecting each construction section, improving construction efficiency, shortening the construction period, and combining the above construction steps to finally form a traffic relief method with a sunken square in a high-drop area during the construction of a railway and subway hub station.
[0018] In one embodiment of the present invention, in step one, the specific steps for determining the foundation pit excavation method and the division of labor in each area are as follows: before construction, explore the geological conditions on site, determine the distribution of each rock layer, understand the construction content and design intention, and reasonably optimize the construction design plan on the premise of meeting relevant specifications, and plan the scale and regional division of traffic relief roads according to actual traffic demand and construction difficulty. Taking the foundation pit with the north-south direction as the short axis and the east-west direction as the long axis as an example, the foundation pit is divided into two areas in the north and south, and the north side is planned as a traffic relief road. According to the construction method of the main structure of the cover excavation and reverse construction, the cover excavation top plate is used as the traffic relief road, and the construction of the north side retaining structure and steel pipe column is completed first, and the construction process is reasonably arranged to minimize the occupation of other traffic routes for traffic relief.
[0019] In one embodiment of the present invention, in step 2, a crown beam is set on the top of the underground continuous wall of the retaining structure to connect each wall as a whole, the floating slurry part of the pile (wall) top of the retaining structure is manually chiseled off, the concrete on the pile (wall) top is broken, and the anchor steel bars on the underground pile top are straightened. The crown beam and waist beam are constructed by on-site binding of steel bars, bamboo plywood + rib wood formwork on the inner side of the foundation pit (the soil side wall reinforced with a water-stop curtain on the other side is used as the outer formwork), and commercial concrete is poured into the formwork; after the concrete pouring and maintenance are completed, the retaining wall is arranged along the crown beam, 0.5m above the ground, 0.2m wide, and C30 concrete is poured.
[0020] In one embodiment of the present invention, in step four, the specific steps of slope cutting and excavation are as follows: the bottom elevation of the north slope is consistent with the crown beam elevation, the top of the slope is consistent with the field elevation, the slope width is determined according to the 1:1 slope cutting, and an excavator is used to dig the north soil to form a slope; the longitudinal slopes on both sides are consistent with the north slope and are sloped according to the 1:1 ratio, and the south slope is excavated according to the 0.5:1 ratio; in areas with large terrain differences, multi-level slope cutting is used to alleviate the terrain difference and reduce the slope. At the same time, soil nail walls and mesh sprayed concrete surface layers are evenly spaced on the slope to reduce the longitudinal verticality, improve the stability of the slope, and further improve the safety during construction.
[0021] In one embodiment of the present invention, in step five, the specific steps of treating the base surface of the ground-anchored wall and pouring the cushion layer are as follows: the base surface of the retaining structure is excavated and chiseled while the foundation pit is excavated, and the rough surface with a bump of not less than 20 mm is roughened by a milling machine, and the ground-anchored wall is chiseled from the top elevation of the top plate to the bottom of the foundation pit to the reserved steel plate position by a drilling rig; the cushion layer is constructed from the earth excavation to the bottom elevation of the structural cover plate to form a uniformly stressed construction platform.
[0022] In one embodiment of the present invention, in step seven, the specific steps of tying and pouring the steel bars of the retaining wall on the top plate are as follows: according to the reserved connector on the upper part of the top plate, the steel bars are connected according to the retaining wall drawing, the steel bars are tied and formed, and steel brackets are set up externally to support the retaining wall steel cage, and connectors are reserved on the top of the retaining wall; the top plate section of the sunken square is used as the boundary area, and the northern half is planned as the relief section, then a permanent retaining wall is set on the north side of the sunken square, and a temporary retaining wall is set on the south side to meet the traffic relief needs, and the upper temporary retaining wall is demolished while the cover plate of the subsequent sunken square section area is broken.
[0023] In one embodiment of the present invention, in step nine, after the construction of the top plate and the retaining wall is completed, the roadbed is backfilled to the elevation of the top of the crown beam of the ground-connected wall, the roadbed is compacted, and the road is formed after pouring concrete, completing the traffic relief construction of the sunken square section.
[0024] In one embodiment of the present invention, the traffic relief section is divided into various areas for simultaneous construction, and the construction is simultaneous from the middle to both sides. Connectors are reserved on the top beam of the ground-connected wall, the top plate and both sides of the retaining wall. Each section is connected by the connector and concrete is poured as a whole. The high-drop area is smoothed by multi-level slope reduction, steel bar connectors are reserved on the top plate, and the main structure is increased in number of floors to complete the terrain transition, forming a gentle slope traffic relief section.
[0025] In one embodiment of the present invention, when excavating a foundation pit in an area with a high drop, the low-span structural slab is preferentially constructed when excavating from a low span to a high span, and the excavation range from the low span to the high span spans at least one cross-beam section, thereby effectively ensuring the stability of the terrain drop transition and solving the problem of excessive deformation of the ground-connected wall and soil instability caused by the self-weight stress of the soil due to the influence of the large drop.
[0026] This application combines permanent and temporary construction, constructs permanent retaining walls and temporary retaining walls, and after the roadbed is backfilled, the upper part of the retaining wall forms a traffic relief road to ensure that the south side site can be constructed normally. The temporary retaining wall and the top plate between the two retaining walls will be removed after the traffic relief is completed, and the sunken square skylight will be constructed, and the permanent retaining wall will begin to assume the retaining function. Multi-area block and time period construction is carried out to efficiently connect each construction section, improve construction efficiency, and shorten the construction period. The traffic relief road is constructed by covering and excavating the top plate. The high-drop section is separated by a beam span and the slope is excavated at a ratio of 1:1. The preset connectors between the top plates of each section are constructed simultaneously. By setting up retaining walls to support the soil pressure of the backfill roadbed of the low-lying sunken square section, traffic relief is completed within the construction site without occupying the original traffic road, improving the construction quality and ensuring construction safety.
[0027] The above are only preferred embodiments of the present invention. It should be pointed out that, for those skilled in the art, several modifications and improvements can be made without departing from the concept of the present invention. These should also be regarded as the protection scope of the present invention. These will not affect the effect of the implementation of the present invention and the practicality of the patent.
Claims
1. A method for traffic relief with a sunken square under high drop conditions, characterized in that: The following steps are involved: Step 1: Determine the foundation pit excavation method and the division of labor in each area; Step 2: Complete the construction of the side ground connection wall and steel pipe column, and construct the cap beam and retaining wall; Step 3: Arrange drainage wells. Set up drainage ditches and sump pits around or in the middle of the excavated foundation pit to collect seepage water and construction wastewater in the foundation pit. Then, use water pumps to pump water into the surface sedimentation tank for sedimentation and then discharge it into the municipal drainage system to complete the precipitation in the pit. At the same time, in order to prevent surface water from flowing into the foundation pit, set up water interception outside the pit. Step 4: Slope excavation; Step 5: Ground-connected wall base surface treatment and cushion pouring; Step 6: Construction of the structural cover plate of the relief section. With the horizontal center of the station as the boundary, the cover plate is cast symmetrically from both sides to the center in sequence, and a combination of permanent and temporary technology is adopted. The top plate of the sunken square section needs to be removed after the overall construction of the foundation pit is completed to form a sunken square skylight; Step 7: Tie and pour the steel bars of the retaining wall on the top plate; Step 8: Repeat the above construction steps to complete the construction of the top plate and retaining wall of the high drop section to achieve the connection of each segmented area; Step 9: Backfill the roadbed and build fences to complete the traffic relief in this section; Step 10. After the main structure of the foundation pit is completed, the excavation outlet is sealed, the road enclosure is removed, and normal road traffic is restored. The upper relief section of the original sunken square is demolished, the top plate and temporary retaining wall here are broken down, and the relief section on the north side remains as it is, completing the construction of the sunken square structure section.
2. The traffic relief method with a sunken square under high drop conditions according to claim 1, It is characterized in that In step one, the specific steps to determine the foundation pit excavation method and the division of labor in each area are as follows: Before construction, survey the geological conditions on site, determine the distribution of each rock layer, understand the construction content and design intention, and reasonably optimize the construction design plan on the premise of meeting relevant specifications. According to the actual traffic demand and construction difficulty, plan the scale and regional division of traffic relief roads. Taking the foundation pit with the north-south direction as the short axis and the east-west direction as the long axis as an example, divide the foundation pit into two areas in the north and south, plan the north side as a traffic relief road, and use the top plate of the cover excavation as a traffic relief road according to the construction method of the main structure of the cover excavation and reverse construction. Give priority to the construction of the north side retaining structure and steel pipe columns, arrange the construction process reasonably, and occupy other traffic routes to the minimum extent for traffic relief.
3. The traffic relief method with a sunken square under high drop conditions according to claim 2, It is characterized in that In step 2, a cap beam is set on the top of the underground continuous wall of the retaining structure to connect each wall into a whole. The floating slurry part of the retaining structure pile top is manually chiseled off, the concrete on the pile top is broken, and the anchor steel bars on the underground pile top are straightened. The cap beam and waist beam are constructed by on-site binding of steel bars and bamboo plywood + rib wood formwork inside the foundation pit. On the other side, the soil side wall reinforced with a water-stop curtain is used as the outer formwork, and commercial concrete is poured into the formwork. After the concrete pouring and maintenance are completed, the retaining wall is arranged along the cap beam, 0.5m above the ground, 0.2m wide, and C30 concrete is poured.
4. The traffic relief method with a sunken square under high drop conditions according to claim 3, It is characterized in that In step four, the specific steps of slope excavation are as follows: the bottom elevation of the north slope is consistent with the crown beam elevation, the top of the slope is consistent with the field elevation, the slope width is determined according to the 1:1 slope, and an excavator is used to dig the north side soil to form a slope; the longitudinal slopes on both sides are consistent with the north slope and are sloped at 1:1, and the south slope is excavated at 0.5:1; in areas with large terrain differences, multi-level slope reduction is used to alleviate the terrain difference and reduce the slope.
5. The traffic relief method with a sunken square under high drop conditions according to claim 4, It is characterized in that In step five, the specific steps for treating the base surface of the ground-anchored wall and pouring the cushion layer are as follows: the base surface of the retaining structure is excavated and chiseled as the foundation pit is excavated, and the rough surface with a bump of not less than 20 mm is roughened with a milling machine. The ground-anchored wall is chiseled from the top elevation of the top plate to the bottom of the foundation pit to the reserved steel plate position with a drilling rig; the cushion layer is constructed from the earth excavation to the bottom elevation of the structure cover plate to form a uniformly stressed construction platform.
6. The traffic relief method with a sunken square under high drop conditions according to claim 1, It is characterized in that In step seven, the specific steps for tying and pouring the steel bars of the retaining wall on the top plate are as follows: according to the reserved connectors on the upper part of the top plate, the steel bars are connected according to the retaining wall drawing, the steel bars are tied and formed, and steel brackets are set up outside to support the retaining wall steel cage, and connectors are reserved on the top of the retaining wall; the top plate section of the sunken square is used as the boundary area, and the northern half is planned as the relief section. A permanent retaining wall is set up on the north side of the sunken square, and a temporary retaining wall is set up on the south side to meet the needs of traffic relief. The upper temporary retaining wall will be demolished while the cover plate of the subsequent sunken square section area is removed.
7. The traffic relief method with a sunken square under high drop conditions according to claim 2, It is characterized in that In step nine, after the construction of the top plate and retaining wall is completed, the roadbed is backfilled to the top elevation of the crown beam of the ground-connected wall, the roadbed is compacted, and the road is formed after pouring concrete, completing the traffic relief construction of the sunken square section.