Underground deep foundation orthogonal pipe gallery construction method

Abstract

The invention relates to an underground deep foundation orthogonal pipe gallery construction method which comprises the following steps: step 1, in a design drawing stage, comprehensively considering the bearing capacity of an underground deep foundation structure, ensuring the overall load of the structure and optimizing the use amount of structural concrete; 2, in combination with the total project construction period and the absolute construction period of each single body, different supporting design schemes are adopted for different single bodies, and the construction safety and quality of each single body are ensured; and thirdly, a segmented construction method is adopted, the slag sluice at the bottom of the rotational flow well and the bottom of the electrical room is constructed firstly, then a water pipe gallery on the upper portion of the slag sluice and a bottom plate of the electrical room are backfilled and constructed, and after well sinking of a rotational flow well shaft is completed, the reserved slag sluice from the rotational flow well to the electrical room is communicated finally, and the construction period is shortened. The construction period is shortened, and the construction cost is saved.

Description

Technical Field

[0001] The invention relates to the field of civil engineering construction, in particular to a method for constructing an underground deep foundation orthogonal pipe gallery. Background Art

[0002] As metallurgical construction technology matures, the design of steel rolling production lines is optimized, and the site is getting smaller and smaller. However, swirl wells, slag flushing ditches, water pipe corridors, and steel rolling electrical rooms are necessary structures for steel rolling production lines. If the selected construction method is unreasonable, it will greatly affect the construction period and quality, and have a greater impact on the overall cost.

[0003] The bottom elevation of the swirl well is , the slag ditch is long from the electrical room to the swirl well, with a slope of 3% and a maximum depth of . The water pipe gallery is located parallel to the upper part of the slag ditch, with a bottom elevation of . The bottom plate of the electrical room and the water pipe gallery are arranged orthogonally, with a bottom elevation of . It is difficult to solve the settlement problem after the deep foundation construction is completed using traditional construction methods. Summary of the invention

[0004] The present invention aims to overcome the defects of the prior art, provide an underground deep foundation orthogonal pipe gallery construction method, and solve the problem of deep foundation settlement quality.

[0005] In order to solve the above-mentioned technical problems, the present invention is achieved as follows: A method for constructing an underground deep foundation orthogonal pipe gallery, characterized in that it comprises the following steps: Step 1: In the design and drawing stage, comprehensively consider the bearing capacity of the underground deep foundation structure, ensure the overall load of the structure, and optimize the amount of structural concrete; Step 2: Based on the total construction period of the project and the absolute construction period of each unit, different support design schemes are adopted for different units to ensure the safety and quality of the construction of each unit; Step 3: Use the segmented construction method to first construct the slag flushing ditch at the bottom of the vortex well and the electrical room, then backfill and construct the water pipe gallery above this slag flushing ditch and the electrical room bottom plate. After the vortex well body caisson is completed, finally connect the slag flushing ditch reserved from the vortex well to the electrical room to save construction time.

[0006] The method for constructing an underground deep foundation orthogonal pipe gallery is characterized in that: step one specifically comprises: analyzing according to the geological survey report, the groundwater level is relatively high, the vortex well adopts dewatering well measures, the construction plan selects caissons, and the bottom of the slag ditch and the electrical room adopts PHS400AB (250) pipe piles with a length of 20m as the support of the underground structure of the slag ditch, water pipe gallery, and electrical room to avoid structural damage due to settlement and thus leakage. The water pipe gallery located above the slag ditch adopts a concrete column support design to reduce the amount of concrete used.

[0007] The method for constructing an underground deep foundation orthogonal pipe gallery is characterized in that: in combination with the total construction period of the project, segmented construction is adopted; the construction period of the vortex well is 3 months, the construction period of the slag flushing ditch is 1 month, the construction period of the water pipe gallery is 1 month, and the construction period of the electrical room is 6 months. If the caisson is not completed, the slag flushing ditch cannot be connected.

[0008] The method for constructing an underground deep foundation orthogonal pipe gallery is characterized in that: the vortex well and the slag flushing ditch at the bottom section of the electrical room are constructed simultaneously, the earthwork elevation of the electrical room bottom plate is overall reduced to -5 meters, and the slag flushing ditch section area is reduced to the elevation of the water pipe gallery bottom -8 meters. A secondary slope steel sheet pile support method is adopted at the -8 meter elevation. The construction period of the slag flushing ditch is 1 month, and the exposed pile heads of some electrical room bottom plates are reinforced and protected with scaffolding pipes.

[0009] The method for constructing an underground deep foundation orthogonal pipe gallery is characterized by: a. After the construction of the top plate of the first slag flushing ditch is completed, the upper column construction is carried out, and the steel sheet piles are pulled out at the same time, and the earthwork is backfilled and compacted in layers, and then the first water pipe gallery structure construction period is 1 month; b. The exposed pile head protection frame of the electrical room is removed, the earth is backfilled and compacted in layers, and the electrical room floor is constructed. The construction period is 1 month; c. The total construction period of the swirl well caisson is 3 months. During this period, the first slag ditch, the first water pipe gallery and the bottom plate of the electrical room have been completed, which will not affect the key process of the upper structure and decoration of the electrical room of the key line of this project and the installation of electromechanical equipment. Then the second slag ditch structure of the swirl well to the electrical room section will be constructed; d. Repeat the construction of the second water pipe gallery; e. Construction of the upper structure of the electrical room, backfilling of the slag ditch from the vortex well to the electrical room, and completion of the construction.

[0010] The beneficial effects of the present invention are as follows: It can be seen from the above technical scheme that the present application provides a method for constructing an underground deep foundation orthogonal pipe gallery, which considers the settlement problem of the underground deep foundation from the design source according to the existing special geological conditions, adopts the optimal support design scheme according to different foundations, and adopts segmented construction according to the process layout in terms of construction to ensure construction quality and construction period and save construction costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a floor plan; Figure 2 This is a schematic diagram of slag ditch support; Figure 3 This is a schematic diagram of step 2 in a specific implementation manner; Figure 4 This is a schematic diagram of steps 3 and 4 in a specific implementation manner; Figure 5 Schematic diagram of steps 5 and 6 in the specific implementation. DETAILED DESCRIPTION

[0012] The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field without creative work based on the embodiments in the embodiments of the present application are within the scope of protection requested by the present application. like Figure 1-5 As shown: A method for constructing an underground deep foundation orthogonal pipe gallery, the specific steps are as follows: Step 1: According to the geological survey report, the groundwater level is high, and the vortex well adopts the dewatering well measures. The construction plan uses the caisson. PHS400AB (250) pipe piles are used at the bottom of the slag ditch and the electrical room. The pile length is 20m. It serves as the support for the underground structure of the slag ditch, water pipe gallery, and electrical room to avoid structural damage and leakage caused by settlement. The water pipe gallery located above the slag ditch adopts a concrete column support design to reduce the amount of concrete used; Step 2: Take segmented construction into consideration of the total construction period of the project. The construction period of the swirl well is 3 months, the construction period of the slag ditch is 1 month, the construction period of the water pipe gallery is 1 month, and the construction period of the electrical room is 6 months. The slag ditch cannot be connected if the caisson is not completed. The swirl well and the slag ditch at the bottom of the electrical room are constructed at the same time. The earthwork elevation of the electrical room bottom plate is reduced to -5 meters as a whole, and the slag ditch section is reduced to -8 meters above the water pipe gallery bottom. The secondary slope steel sheet pile support method is adopted at the -8 meter elevation. The construction period of the slag ditch is 1 month, and the exposed pile heads of some electrical room bottom plates are reinforced and protected with scaffolding pipes; Step 3: After the construction of the top plate of the slag flushing ditch 1 is completed, the upper column construction is carried out, and the steel sheet piles are pulled out at the same time, and the earthwork is backfilled and compacted in layers, and then the water pipe gallery 1 structure construction is carried out for a period of 1 month; Step 4: Remove the exposed pile head protection frame of the electrical room, backfill and compact the earth in layers, and carry out the electrical room floor construction, with a construction period of 1 month; Step 5: The total construction period of the swirl well caisson is 3 months. During this period, the construction of the slag ditch 1, water pipe gallery 1, and electrical room floor has been completed, which will not affect the key process of the upper structure and decoration of the electrical room of the key line of this project and the installation of electromechanical equipment. Then the slag ditch 2 structure construction of the swirl well to the electrical room section will be carried out; Step 6: Repeat steps 2 and 3 to construct water pipe gallery 2.

[0013] Step 7: Construction of the upper structure of the electrical room, backfilling of the slag ditch from the vortex well to the electrical room, and completion of the construction.

[0014] The present invention adopts square piles as the main load-bearing force of the underground foundation, thereby avoiding the damage of the underground structure and the occurrence of structural leakage caused by backfill settlement of the deep foundation pit.

[0015] The present invention compares various support methods. The swirl well is constructed by caisson, the slag flushing ditch is supported by steel sheet piles, and the construction is carried out in sections, so as to ensure the construction period of the key line electrical room structure of this project and save support costs.

[0016] The above are only embodiments provided for the present application and are not intended to limit the present application. Although the present application is described in detail with reference to the embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. However, any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A method for constructing an orthogonal underground deep foundation pipe gallery, characterized in that It includes the following steps: Step 1: In the design and drawing stage, comprehensively consider the bearing capacity of the underground deep foundation structure, ensure the overall load of the structure, and optimize the amount of structural concrete; Step 2: Based on the total construction period of the project and the absolute construction period of each unit, different support design schemes are adopted for different units to ensure the safety and quality of the construction of each unit; Step 3: Use the segmented construction method to first construct the slag flushing ditch at the bottom of the vortex well and the electrical room, then backfill and construct the water pipe gallery above this slag flushing ditch and the electrical room bottom plate. After the vortex well body caisson is completed, finally connect the slag flushing ditch reserved from the vortex well to the electrical room to save construction time.

2. A method for constructing an underground deep foundation orthogonal pipe gallery according to claim 1, characterized in that: Step 1 is as follows: According to the geological survey report, the groundwater level is high, and the vortex well adopts dewatering measures. The caisson is selected in the construction plan. PHS400AB (250) pipe piles are used at the bottom of the slag ditch and the electrical room. The pile length is 20m. They serve as the support for the underground structure of the slag ditch, water pipe gallery, and electrical room to avoid structural damage and leakage due to settlement. The water pipe gallery located above the slag ditch is supported by concrete columns to reduce the amount of concrete used.

3. The method for constructing an underground deep foundation orthogonal pipe gallery according to claim 1, characterized in that: Combined with the total construction period of the project, the construction is carried out in sections; the construction period of the vortex well is 3 months, the construction period of the slag flushing ditch is 1 month, the construction period of the water pipe gallery is 1 month, and the construction period of the electrical room is 6 months. The caisson has not been completed and the slag flushing ditch cannot be connected.

4. A method for constructing an underground deep foundation orthogonal pipe gallery according to claim 3, characterized in that: The swirl well and the slag flushing ditch 1 at the bottom section of the electrical room were constructed simultaneously. The earthwork elevation of the electrical room bottom plate was overall reduced to -5 meters, and the slag flushing ditch section area was reduced to -8 meters above the water pipe gallery bottom elevation. A secondary sloped steel sheet pile support method was adopted at the -8 meter elevation. The construction period of the slag flushing ditch was 1 month. The exposed pile heads of some electrical room bottom plates were reinforced and protected with scaffolding pipes.

5. The method for constructing an underground deep foundation orthogonal pipe gallery according to claim 4, characterized in that: a. After the construction of the top plate of the first slag flushing ditch is completed, the upper column construction is carried out, and the steel sheet piles are pulled out at the same time, and the earthwork is backfilled and compacted in layers, and then the first water pipe gallery structure construction period is 1 month; b. The exposed pile head protection frame of the electrical room is removed, the earth is backfilled and compacted in layers, and the electrical room floor is constructed. The construction period is 1 month; c. The total construction period of the swirl well caisson is 3 months. During this period, the first slag ditch, the first water pipe gallery and the bottom plate of the electrical room have been completed, which will not affect the key process of the upper structure and decoration of the electrical room of the key line of this project and the installation of electromechanical equipment. Then the second slag ditch structure of the swirl well to the electrical room section will be constructed; d. Repeat the construction of the second water pipe gallery; e. Construction of the upper structure of the electrical room, backfilling of the slag ditch from the vortex well to the electrical room, and completion of the construction.

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