Construction organization method for super-large-area foundation pit under condition of short construction period
By dividing the super-large foundation pit into multiple construction zones, laying and retaining roads on the outer edges and setting up temporary gates, and excavating the earth by jumping excavation method, the problems of tight construction periods and difficult construction organization during construction projects in dense urban areas are solved. The construction period is completed on time and the underground structure is advanced.
Patent Information
- Application Number
- CN202411590444.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-08
- Publication Date
- 2025-02-07
AI Technical Summary
When construction projects are carried out in dense urban areas, the construction period is tight and the layout transportation and construction organization are difficult.
The super-large-area foundation pit is divided into multiple construction zones, and a 1:1 slope is arranged on the outer edge of the first-level slope and the reserved roads within the outer edge, and a temporary gate is set up. The excavation method is used to excavate the earth, and priority is given to passing. The road transport earth is retained on the periphery and inside.
By reducing the footprint and construction costs of the retained road, channels for earth excavation and foundation construction are provided, ensuring the completion of the construction period on time, and providing possibilities for the advance construction of underground structures.
Smart Images
Figure CN119392715A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of building construction, and in particular to a method for organizing construction of a super-large foundation pit under tight construction schedule. Background Art
[0002] When carrying out construction projects in densely populated urban areas, they are often restricted by the environmental constraints of the construction site. When there are many construction units in a construction project, the construction period is tight, and there is no existing construction experience to refer to, plane transportation and construction organization are more difficult. Summary of the invention
[0003] In order to overcome the defects of the prior art, a method for organizing the construction of a super-large foundation pit under tight construction schedule is provided to solve the problem of difficult plane transportation and construction organization during the construction of building projects in densely populated urban areas.
[0004] In order to achieve the above-mentioned purpose, a method for organizing the construction of a large-scale foundation pit under tight construction schedule is provided, which comprises the following steps:
[0005] Divide the large foundation pit into multiple construction zones;
[0006] On the outer edge of the super-large foundation pit, a first-level slope is provided with a slope ratio of 1:1 to lay out the peripheral reserved road;
[0007] An internal reserved road is laid out inside the super-large foundation pit, and the internal reserved road is set on the ground between the main buildings;
[0008] Two newly added temporary gates are respectively arranged on opposite sides of the super-large foundation pit, so that the two newly added temporary gates are respectively connected to the outer reserved road and the inner reserved road;
[0009] The earthwork of the multiple construction zones is excavated using a skip excavation method, with priority given to excavating the earthwork near the outer retained road, the inner retained road, and the main building area, so that each batch of excavated earthwork is transported out of the construction site via the outer retained road and the inner retained road respectively.
[0010] Furthermore, before excavating the earth, a retaining structure is constructed along the outer edge of the super-large foundation pit and the pit is reinforced.
[0011] Furthermore, the retaining structure adopts double rows of SMW piles.
[0012] Furthermore, the pit reinforcement is a front-supported grouting steel pipe, the upper end of which is supported by the double-row SMW piles, and the lower end of which is anchored in the soil in the super-large area foundation pit.
[0013] The beneficial effect of the present invention is that the method for organizing the construction of a super-large foundation pit under a tight construction period of the present invention uses the outer edge of the super-large foundation pit to arrange the peripheral reserved road, and can directly adopt a slope ratio of 1:1 for the first-level slope, reduce the area occupied by the reserved road, and reduce the cost of arranging the construction road. Due to the existence of earthwork in the peripheral reserved road area, it will not only not affect the construction of key lines in the main building area, but also provide a channel for the transportation of resources on the north side of the first opening area during earthwork excavation, foundation slab construction, underground structure construction and basement roof maintenance. In addition, to a certain extent, the peripheral reserved road plays a certain supporting role on the retaining structure on the north side of the first opening area, and plays a favorable role in the large-scale excavation of earthwork in the first opening area. On the other hand, new temporary gates are set on the opposite sides of the super-large foundation pit, and the outer reserved road and the internal reserved road are used to transport earthwork during earthwork excavation. The new temporary gate can not only serve as a channel for earthwork excavation in the area between the main buildings, but also provide transportation conditions for the first opening area after the roof of the first opening area reaches the design strength, which also provides the possibility for the early construction of earthwork and underground structures in the reserved road area. Earth excavation is carried out in sections using the skip excavation method, and plane transportation and foundation pit construction are organized in an orderly manner. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:
[0015] Figures 1 to 5 The present invention is a schematic diagram of the steps of a method for organizing construction of a super-large foundation pit under tight construction schedule according to an embodiment of the present invention.
[0016] Figure 6 This is a plan view of the ultra-large area foundation pit construction according to an embodiment of the present invention. DETAILED DESCRIPTION
[0017] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.
[0018] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.
[0019] Reference Figures 1 to 5 As shown, the present invention provides a method for organizing the construction of a large-area foundation pit under tight construction schedule, comprising the following steps:
[0020] S1. Before excavation, a retaining structure a is constructed along the outer edge of the super-large foundation pit and the pit is reinforced.
[0021] The retaining structure a adopts double rows of SMW piles.
[0022] The pit reinforcement is a front-supported grouting steel pipe b, the upper end of which is supported by a double row of SMW piles, and the lower end of which is anchored in the soil in the super-large foundation pit.
[0023] S2. Divide the super-large foundation pit into multiple construction areas.
[0024] S3. On the outer edge of the super-large foundation pit, a first-level slope with a slope ratio of 1:1 is used to lay out the outer retaining road A.
[0025] S4. An internal reserved road B is laid out on the inner side of the super-large foundation pit, and the internal reserved road B is set on the ground between the main buildings d.
[0026] S5. Two new temporary gates c are set on the opposite sides of the super-large foundation pit, so that the two new temporary gates c are connected to the outer reserved road A and the inner reserved road B respectively.
[0027] S6. Use the skip excavation method to excavate the earth in multiple construction zones, giving priority to the earth near the outer retained road A, the inner retained road B, and the main building d area, so that each batch of excavated earth is transported out of the construction site via the outer retained road A and the inner retained road B respectively.
[0028] In order to further illustrate in detail the method for organizing construction of a super-large foundation pit under tight construction schedule of the present invention, the following embodiments are cited for illustration.
[0029] See also Figure 6 As shown, in this embodiment, the construction project of the super large foundation pit has 21 single buildings on the ground, including 14 residential buildings and 7 supporting buildings. There is a basement for underground garage. The residential building is an assembled integral shear wall structure, and the supporting building is a frame structure. This project has high requirements for the construction period of the batch construction nodes, and the pre-sale node construction period is very tight.
[0030] The north side of the project site is surrounded by low-rise and multi-story office buildings of other enterprises, with a maximum height of no more than 20m. The east and west sides of the site are municipal roads, and there is also a residential area on the west side of the site, which imposes certain restrictions on construction vehicles. The south side of the site is a planned road that has not yet started construction and cannot be used as an entrance or exit during the construction period. Therefore, only the west and east sides of this project can be used as construction entrances and exits (new temporary gate c).
[0031] The total land area of this project is 56,433 square meters, and the main construction content is 14 residential buildings with 13 to 16 floors and supporting rooms. According to the development needs and drawing requirements of the owner, this project, as a residential project, has a pre-sale node. According to the pre-sale node required by the owner and the earthwork excavation design drawings, this project will be divided into the first opening area, the second batch, and the third batch for construction. Figure 1 The first opening area shown covers an area of about 25,190 square meters. It has a large area and many internal units, which makes plane transportation and construction organization difficult. The construction period of the first opening area is very tight. The total construction period from the start of the first opening area to the pre-sale of the first opening area is 90 days, and it needs to complete: enclosure construction, earth excavation, bottom plate structure, basement structure, ground structure to pre-sale (6F) construction, and the construction period is extremely tight.
[0032] S10. See Figure 1 As shown, the enclosure project of the first opening area and the reinforcement construction in the pit.
[0033] According to the design drawings, the retaining wall project uses double-row SMW piles (double-axis mixing piles with inserted steel).
[0034] After the enclosure project is completed, the skirt reinforcement on the inside of the SMW pile, the pit reinforcement and the front-support grouting steel pipe construction will be immediately arranged.
[0035] S20. Divide the large-scale foundation pit into multiple construction areas.
[0036] Due to the geological conditions of the project site, the earthwork excavation of this project adopts secondary slope excavation with a slope ratio of 1:1.5. The initial excavation area of this project is divided into three blocks: 1-1, 1-2, and 1-3, as follows Figure 2 shown.
[0037] S30. On the outer edge of the super-large foundation pit, a first-level slope with a slope ratio of 1:1 is used to lay out the outer retaining road A.
[0038] During the construction period, gate 1# will be set up according to the permanent crossing in the later stage. A temporary reserved road will be set up in the site according to the reinforcement of gate 1# and skirt, and 50mm cushion layer + 200mm thick reinforced concrete will be added to provide resource transportation for the first opening area during earth excavation, foundation slab construction, underground structure construction and basement roof maintenance. When the first opening area has the driving conditions in the later stage, earth excavation and underground structure construction will be carried out in the reserved road area.
[0039] S40. An internal reserved road B is laid out on the inner side of the super-large foundation pit, and the internal reserved road B is set on the ground between the main buildings d.
[0040] S50. Two new temporary gates c are respectively set on opposite sides of the super-large foundation pit, so that the two new temporary gates c are connected to the outer reserved road A and the inner reserved road B respectively.
[0041] S60, use the skip excavation method to excavate earthwork in multiple construction zones.
[0042] The construction sequence of earth excavation is: 1-1→1-2→1-3.
[0043] When carrying out the earth excavation construction of 1-1 and 1-2 blocks, a construction road will be left in the east-west direction of Gate 2#.
[0044] The excavation area 1-1 and 1-2 adopts the skip excavation method, giving priority to the excavation and construction of the earthwork and base plate of the main building area. When excavating the earthwork of 1-1 and 1-2, an earthwork passage is reserved in the east-west direction of Gate 2#. The top elevation of the passage is cut by an excavator, and the slope is found from Gate 2# to the top elevation of the earthwork passage.
[0045] When excavating the earth in blocks 1-3, excavate from the far side toward gate 2#.
[0046] like Figure 5 As shown, during the construction of the foundation slab of the first development area, the resources required for the construction on the north side of the first development area are transported to the construction surface through the reserved roads and tower cranes, and the resources required for the construction on the south side of the first development area are transported to the site through the temporary roads of the second and third batches of unexcavated sections on the south side.
[0047] During the construction of underground structures in the first development area, the resources required for construction on the north side of the first development area are transported to the construction site through reserved roads and tower cranes, and the resources required for construction on the south side of the first development area are transported to the site through the second and third batches of temporary roads in the unexcavated sections on the south side.
[0048] Before the 1 / 3 pre-sale node of the main building in the first phase of the project, the resources required for the ground structure construction of the main building on the north side of the first phase of the project were transported to the construction site through the reserved roads and tower cranes, and the ground structure construction of the main building on the north side of the first phase of the project was transported to the site through the temporary roads of the second and third batches of unexcavated sections on the south side.
[0049] After the top slab of the first development area reaches the designed strength, the road retention area of the first development area and the second batch of earth excavation and underground structure construction will be carried out.
[0050] The present invention aims at the construction organization method of super-large-area foundation pit under the condition of tight construction schedule. The north side skirt of the first opening area is reinforced, and the road is arranged on the north side of the first opening area. The first-level slope can be directly cut with a slope ratio of 1:1, which reduces the floor space of the reserved road and reduces the construction road arrangement cost.
[0051] Considering that the construction period required by the owner is very tight, the method for organizing the construction of a super-large-area foundation pit under tight construction period of the present invention gives priority to the construction of the main building area on the key line, and fully considers the construction period of the main building to carry out earth excavation and foundation pit construction.
[0052] The first development area occupies a large area, and the site and transportation are limited. During the earth excavation, foundation slab construction, underground structure construction and basement roof maintenance, if the full excavation method is adopted, the resources on the north side of the first development area cannot be transported to the site, which has a great impact on the construction period and cannot be completed as required by the owner. Therefore, a special 3# gate and reserved road are set up for material transportation until the basement roof of the first development area reaches the design strength and meets the driving conditions, and then earth excavation and underground structure construction are carried out in the reserved road area.
[0053] Due to the existence of earthwork in the peripheral reserved road area, it will not only not affect the construction of key lines in the main building area, but also provide a channel for the transportation of resources on the north side of the first development area during earthwork excavation, foundation slab construction, underground structure construction and basement roof maintenance. In addition, to a certain extent, the peripheral reserved road plays a certain supporting role for the retaining structure on the north side of the first development area, which is beneficial to the large-scale earthwork excavation in the first development area.
[0054] Because of the relative position of the main building in the foundation pit, there is a large amount of earth between the main building areas. If this area is excavated at the same time as the earth excavation in the main building area, the construction speed in the main building area will be greatly slowed down; if the main building area is constructed first, there will be no transportation channel for earth between these areas in the later stage. Therefore, Gate 2# is set on the east side of this area. When excavating 1-1 and 1-2 earthworks, an earthwork channel is reserved in the east-west direction of Gate 2#. The top elevation of the channel is cut by an excavator, and the slope is found from Gate 2# to the top elevation of the earthwork channel. When excavating earthwork in blocks 1-3, the excavation is retreated from far to Gate 2#.
[0055] Gate 2# can not only serve as a passage for earth excavation in the area between the main buildings, but also provide transportation conditions for the first development area after the top plate of the first development area reaches the design strength. This also makes it possible to retain the earthwork and underground structure in the road area in advance.
[0056] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.
Claims
1. A method for organizing the construction of a large-scale foundation pit under tight construction schedule, characterized in that: The following steps are involved: Divide the large foundation pit into multiple construction zones; On the outer edge of the super-large foundation pit, a first-level slope is provided with a slope ratio of 1:1 to lay out the peripheral reserved road; An internal reserved road is laid out inside the super-large foundation pit, and the internal reserved road is set on the ground between the main buildings; Two newly added temporary gates are respectively arranged on opposite sides of the super-large foundation pit, so that the two newly added temporary gates are respectively connected to the outer reserved road and the inner reserved road; The earthwork of the multiple construction zones is excavated using a skip excavation method, with priority given to excavating the earthwork near the outer retained road, the inner retained road, and the main building area, so that each batch of excavated earthwork is transported out of the construction site via the outer retained road and the inner retained road respectively.
2. The method for organizing construction of a large-scale foundation pit under tight construction schedule according to claim 1 is characterized in that: Before excavating the earth, a retaining structure is constructed along the outer edge of the super-large foundation pit and the pit is reinforced.
3. The method for organizing construction of a large-scale foundation pit under tight construction schedule according to claim 2 is characterized in that: The retaining structure adopts double rows of SMW piles.
4. The method for organizing construction of a large-scale foundation pit under tight construction schedule according to claim 3 is characterized in that: The pit reinforcement is a front-supported grouting steel pipe, the upper end of which is supported by the double-row SMW piles, and the lower end of which is anchored in the soil in the super-large foundation pit.