Construction method for high-drop pipe shaft concrete structure with internally laid pipelines

Abstract

The present invention discloses a construction method for a high-drop pipe shaft concrete structure with internal laid pipelines, aiming to solve the problem that the space of the high-drop shaft is small and personnel cannot enter the shaft to install pipelines, and to ensure the safety of personnel, the welding quality of pipelines and the feasibility of the test scheme during the pipeline installation process. The structure includes an upper equipment room, a lower equipment room, a high-drop shaft, and a number of water supply and drainage steel pipes. The drainage steel pipes are vertically arranged in the high-drop shaft, and a backfill concrete structure is provided in the high-drop shaft. The steps of the construction method include first excavating the upper equipment room and the lower equipment room, and excavating the high-drop shaft; hoisting the water supply and drainage steel pipes; and segmentally backfilling the excavated high-drop shaft with concrete. When the drop of the pipe shaft exceeds a certain height, the high-drop pipe shaft can be divided into several sections, and the above pipeline laying, concrete structure and construction method can be set to be similar or the same.

Description

Technical Field

[0001] The present invention relates to the technical field of water conservancy and hydropower engineering, and particularly relates to a construction method for a high-drop pipe well concrete structure with an internally laid pipeline. Background Art

[0002] In water conservancy and hydropower projects, a large number of underground chambers are provided to arrange equipment to meet the operation needs of facilities, including many water supply systems, leakage or maintenance drainage systems. Affected or restricted by the downstream river tail water level, these water supply and drainage systems set the water supply and drainage pipelines above the highest downstream tail water level. Since the underground chamber and the downstream tail water level are isolated by thick rock masses. In order to find a simple, smooth and safe drainage line, sometimes it is necessary to chisel vertical shafts with a drop of dozens of meters or even up to hundreds of meters in the thick rock mass to arrange the water supply and drainage pipelines. For the safety during the rock excavation construction process and to save investment costs, the excavation cross-sectional dimensions of these shafts often only consider being able to accommodate the drainage pipelines. In this way, it is impossible to take more safety measures for the shafts in terms of personnel or equipment. There may be falling rocks in the high-drop shafts, and there is also a risk of falling from a height when personnel enter. Especially in the shaft space after installation, personnel simply cannot enter. This causes great difficulties in the installation of pipelines and the backfilling of concrete. At the same time, the construction quality of the pipelines and their long-term operation cannot be fully guaranteed. There is an urgent need to find a safe and effective method to ensure the safety of personnel during pipeline laying, reduce the construction difficulty, and also ensure the reliability of the laid pipelines, and ensure the long-term safe and stable operation of the water supply and drainage system pipelines.

[0003] In the past, some projects used reverse drilling to separately excavate small-diameter shafts without lining inside the shafts, and the pipelines were laid openly in the pipe wells. The advantage of this is that personnel do not need to install and operate inside the pipe wells. The problem is that when there are many water supply and drainage pipelines, more small-diameter shafts need to be excavated to meet the pipeline laying needs, and the economic cost is relatively high; if affected by geological conditions, a pump house with a larger planar size needs to be set up to correspond to the pipelines inside the pipe wells. And during long-term operation, falling rocks in the shafts may cause damage or destruction to the pipelines or equipment inside the pipe wells.

[0004] Therefore, after summarizing the deficiencies of the existing high-drop pipe well settings, the present technical invention attempts to use large-scale mechanical excavation of large-diameter shafts to reduce the number of shafts and arrange more water supply and drainage pipelines. To ensure the safe operation of the pipelines, the methods of integral hoisting, segmented welding, and mechanical pouring of sectional and layered concrete are used to solve the safety and long-term stable operation of pipeline laying. After consulting the literature, similar practices have not been reported. Summary of the Invention

[0005] The present invention provides a construction method for a high-drop pipe well concrete structure with internal pipelines laid, aiming to solve the problem that the space of the high-drop shaft is small and personnel cannot enter the shaft to install pipelines, ensuring the safety of personnel, the welding quality of pipelines, and the feasibility of the test plan during the pipeline installation process; at the same time, after the pipeline installation is completed, a reasonable and safe high-drop shaft backfill concrete structure is designed, and the pouring sequence and timing of concrete are determined to ensure the safety of the installed drainage pipelines and the well body structure.

[0006] To achieve the above object, the present invention adopts the following technical solutions:

[0007] A high-drop pipe well concrete structure with internal pipelines laid according to the present invention includes an upper equipment room, a lower equipment room, a high-drop shaft, and a plurality of water supply and drainage steel pipes. The high-drop shaft is excavated between the upper equipment room and the lower equipment room, the drainage steel pipes are vertically arranged in the high-drop shaft, and a backfill concrete structure is provided in the high-drop shaft.

[0008] Preferably, the backfill concrete structure includes, from top to bottom, the shaft section one concrete of the "T"-shaped concrete structure, the shaft section two concrete of the cylindrical concrete structure, and the shaft section three concrete of the inverted "T"-shaped concrete structure.

[0009] Preferably, the drainage steel pipe is composed of a plurality of steel pipe sections connected end to end. A steel pipe support cylinder for supporting the bottom steel pipe section is provided in the lower equipment room, and an upper steel frame platform for installing and fixing the top steel pipe section is provided at the top position of the high-drop shaft in the upper equipment room.

[0010] Preferably, a lower equipment room concrete layer is laid on the top of the lower equipment room. Steel support plates are respectively erected around the contact part between the bottom of the shaft section three concrete and the lower equipment room concrete layer, and round pipe columns are well supported under the steel support plates; a connecting steel pipe is arranged in the concrete layer of the shaft section three concrete, and the connecting steel pipe is inserted into both the concrete layer of the shaft section three concrete and the lower equipment room concrete layer.

[0011] Preferably, a traffic tunnel is provided in the lower equipment room.

[0012] A construction method for a high-drop pipe well concrete structure with internal pipelines laid according to the present invention includes the following steps:

[0013] Step 1, first excavate the upper equipment room, the lower equipment room, and the traffic tunnel to complete the layout room for the excavation equipment of the high-drop shaft, and then excavate the high-drop shaft.

[0014] Step 2, erect a hoisting device in the upper equipment room, use the hoisting device to lift a plurality of steel pipe sections, and weld and install the steel pipe sections to form the water supply and drainage steel pipe.

[0015] Step 3: Carry out segmented concrete backfilling for the excavated high-drop shaft.

[0016] Preferably, step 2 further includes:

[0017] Step 201: After the excavation of the high-drop shaft is completed, erect a hoisting device in the upper equipment room.

[0018] Step 202: Use the hoisting device to lift the steel pipe pipe sections, and erect a temporary pipeline support platform in the lower equipment room to support the bottom steel pipe pipe sections. The hoisting device lifts the steel pipe pipe sections and welds the steel pipe pipe sections in sequence to form a water supply and drainage steel pipe.

[0019] Step 203: Erect a steel platform at the top of the high-drop shaft, and use the steel frame platform to fix the water supply and drainage steel pipe horizontally and in the direction of the shaft.

[0020] Step 204: Seal the upper and lower ends of the water supply and drainage steel pipe respectively, and conduct a water pressure test. After confirming that the water pressure test passes, set up a steel pipe support cylinder at the bottom of the water supply and drainage steel pipe.

[0021] Step 205: Repeat steps 202, 203, and 204 to complete the installation of all water supply and drainage steel pipes in the high-drop shaft.

[0022] Preferably, step 3 further includes:

[0023] Step 301: Divide the backfilled concrete in the high-drop shaft into three sections, namely, the concrete of shaft section one with a "T"-shaped concrete structure, the concrete of shaft section two with a cylindrical concrete structure, and the concrete of shaft section three with an inverted "T"-shaped concrete structure.

[0024] Step 302: Pour the concrete layer of the lower equipment room at the top of the lower equipment room while erecting the connecting steel pipe 12. After the concrete layer of the lower equipment room is completed, erect steel support plates around the perimeter where the bottom of the concrete of shaft section three contacts the concrete layer of the lower equipment room, and support round pipe columns under the steel support plates.

[0025] Step 303: Erect a guide pipe in the high-drop shaft, and conduct segmented concrete pouring for the concrete of shaft section one, the concrete of shaft section two, and the concrete of shaft section three in sequence through the guide pipe.

[0026] Preferably, the method further includes: Step 4: Divide the high-drop pipe well into several section structures, and use the methods of steps 1 - 3 for each section structure until the pipeline laying and concrete structure construction in the entire high-drop pipe well are completed.

[0027] The main achievement of the technical invention solution is that equipment rooms for equipment operation and installation are provided at both the upper and lower ends of the high-drop vertical shaft, solving the space required for equipment layout during the excavation of the high-drop vertical shaft. The lower equipment room can also serve as the slag transportation channel during the excavation of the vertical shaft, and at the same time can also serve as the operation and support platform for pipeline installation in the high-drop vertical shaft, solving the construction site problem of the high-drop pipe well. At the same time, for the pipeline construction of the ultra-high-drop vertical shaft, the lower equipment room can also serve as the upper equipment room of the lower section of the vertical shaft, enabling the reuse of space. At the same time, the segmented method is adopted to solve the pipeline construction problem of the ultra-high-drop vertical shaft. The technical invention solution adopts the docking method of suspending and installing the pipeline installed on the upper part of the hoisting equipment with the steel pipe pipe section in the lower equipment room, solving the difficulty of cramped construction space for personnel in the vertical shaft and avoiding construction safety risks such as falling stones in the vertical shaft, high-altitude falls, and operations in a toxic gas environment during the construction process.

[0028] The technical invention solution divides the high-drop vertical shaft into three sections for concrete construction, sets different concrete structures for different sections, and connects them together with steel pipes between the concrete at the lower part of the vertical shaft and the top of the lower equipment room. By adopting a construction process staggered in time, it not only solves the problem of the large load-bearing of the bottom formwork for concrete backfilling construction in the high-drop vertical shaft, but also ensures that the structure of the high-drop vertical shaft can withstand the large loads generated during the operation of the water supply and drainage pipelines. The technical invention solution has been proven feasible through practical application in a large project, and at the same time greatly saves the investment in the installation process and is worthy of popularization and application. Brief Description of the Drawings

[0029] Figure 1 It is a structural schematic diagram of a concrete structure of a high-drop pipe well with internal pipelines laid according to the present invention.

[0030] Figure 2 It is a pipeline installation state diagram of step 2 of the construction method of a concrete structure of a high-drop pipe well with internal pipelines laid according to the present invention.

[0031] Figure 3 It is a pouring state diagram of the three sections of concrete in the vertical shaft in step 3 of the construction method of a concrete structure of a high-drop pipe well with internal pipelines laid according to the present invention.

[0032] Figure 4 It is a pouring state diagram of the second section of concrete in the vertical shaft in step 3 of the construction method of a concrete structure of a high-drop pipe well with internal pipelines laid according to the present invention.

[0033] Figure 5 It is a pouring state diagram of the first section of concrete in the vertical shaft in step 3 of the construction method of a concrete structure of a high-drop pipe well with internal pipelines laid according to the present invention.

[0034] Markings in the figure:

[0035] 1. Hoisting equipment; 2. Concrete mixer truck; 3. Hook; 4. Feeding pipe; 5. Flange-type hoisting cover; 6. Water supply and drainage steel pipe; 7. Steel frame platform; 8. Upper equipment room; 9. Concrete for the first section of the shaft; 10. Concrete for the second section of the shaft; 11. Concrete for the third section of the shaft; 12. Connecting steel pipe; 13. Concrete layer of the lower equipment room; 14. Lower equipment room; 15. Traffic tunnel; 16. Steel support plate; 17. Circular pipe column; 18. Steel pipe support cylinder; 19. Steel pipe section; 20. Temporary support platform for pipelines. Specific implementation mode

[0036] The present invention will be further described below in conjunction with the accompanying drawings and specific implementation modes.

[0037] As Figure 1 、 Figure 2 shown, a high-drop pipe shaft concrete structure with internal pipelines laid therein according to the present invention includes an upper equipment room 8, a lower equipment room 14, a high-drop shaft, a plurality of water supply and drainage steel pipes 6. The high-drop shaft is excavated between the upper equipment room 8 and the lower equipment room 14, the drainage steel pipes 6 are vertically arranged in the high-drop shaft, and a backfill concrete structure is provided in the high-drop shaft.

[0038] The backfill concrete structure includes, from top to bottom, concrete for the first section of the shaft 9 with a "T"-shaped concrete structure, concrete for the second section of the shaft 10 with a cylindrical concrete structure, and concrete for the third section of the shaft 11 with an inverted "T"-shaped concrete structure.

[0039] The lower equipment room 14 is provided with a traffic tunnel 15. A concrete layer of the lower equipment room 13 is laid on the top of the lower equipment room 14. Steel support plates 16 are respectively erected around the contact part between the bottom of the concrete for the third section of the shaft 11 and the concrete layer of the lower equipment room 13, and circular pipe columns 17 are well supported under the steel support plates 16. A connecting steel pipe 12 is arranged in the concrete layer of the concrete for the third section of the shaft 11, and the connecting steel pipe 12 is inserted into both the concrete layer of the concrete for the third section of the shaft 11 and the concrete layer of the lower equipment room 13.

[0040] The lower equipment room 14 and the traffic tunnel 15 can provide sufficient space for the installation, welding and hydrostatic test of the lower part of the water supply and drainage pipelines 6. At the same time, it can also be used as the installation space for the construction of the lower support steel formwork 16 during the concrete backfill in the shaft where the pipelines are installed. When laying pipelines and backfilling concrete in a shaft with a large drop, the shaft can be segmented, and more intermediate equipment installation platforms can be set at the segmented parts by imitating the lower equipment room 14 and the traffic tunnel 15, which can reduce the difficulty of laying pipelines in the shaft with a large drop, improve the difficulty of the backfill concrete structure in the ultra-high-drop shaft, and improve the safety of the water supply and drainage pipeline system.

[0041] The water supply and drainage steel pipe 6 is composed of several steel pipe sections 19 connected end to end. Inside the lower equipment room 14, there is a steel pipe support cylinder 18 for supporting the bottom steel pipe section 19. At the top position of the high-drop shaft in the upper equipment room 8, there is an upper steel frame platform 7 for installing and fixing the top steel pipe section 19.

[0042] The embodiment of the present invention also provides a construction method for a high-drop pipe well concrete structure with internal laid pipelines. The method includes the following steps:

[0043] Step 1: First, excavate the upper equipment room 8, the lower equipment room 14, and the traffic tunnel 15 to complete the layout rooms for the excavation equipment of the high-drop shaft, and then excavate the high-drop shaft.

[0044] Step 2: Erect a hoisting device 1 in the upper equipment room 8, use the hoisting device 1 to lift several steel pipe sections 19, and weld and install the steel pipe sections 19 to form the water supply and drainage steel pipe 6.

[0045] As Figure 3 shown, Step 2 further includes:

[0046] Step 201: After the excavation of the high-drop shaft is completed, erect a hoisting device 1 in the upper equipment room 8.

[0047] Step 202: Use the hoisting device 1 to lift the steel pipe section 19, and erect a pipeline temporary support platform 20 in the lower equipment room 14 to support the bottom steel pipe section 19. The hoisting device 1 lifts the steel pipe section 19 and welds the steel pipe sections 19 in sequence to form the water supply and drainage steel pipe 6. In specific operations, the hoisting device 1 and the hook 3 of the hoisting device are mainly used for hoisting during the installation of pipelines in the shaft, and are connected to the steel pipe section 19 through a flange-type hoisting cover 5.

[0048] Step 203: Erect a steel platform 7 at the top of the high-drop shaft, and use the steel frame platform 7 to fix the water supply and drainage steel pipe 6 horizontally and in the shaft direction.

[0049] Step 204: Seal the upper and lower ends of the water supply and drainage steel pipe 6 respectively, and conduct a water pressure test. After confirming that the water pressure test passes, set up a steel pipe support cylinder 18 at the bottom of the water supply and drainage steel pipe 6.

[0050] Step 205: Repeat Step 202, Step 203, and Step 204 to complete the installation of all water supply and drainage steel pipes 6 in the high-drop shaft.

[0051] Step 3: Conduct segmented concrete backfilling for the excavated high-drop shaft.

[0052] Step 4: Divide the high-drop pipe well into several section structures, and each section structure is constructed using the methods of Steps 1 - 3 until the pipeline laying and concrete structure construction in the entire high-drop pipe well are completed.

[0053] As Figure 4 , Figure 5 shown, step 3 further includes:

[0054] Step 301: Divide the backfill concrete in the high-drop shaft into three sections, namely, the shaft section one concrete 9 of the "T"-shaped concrete structure, the shaft section two concrete 10 of the cylindrical concrete structure, and the shaft section three concrete 11 of the inverted "T"-shaped concrete structure;

[0055] Step 302: Pour the lower equipment room concrete layer 13 on the top of the lower equipment room 14 while erecting the connecting steel pipe 12. After the lower equipment room concrete layer 13 is completed, steel support plates 16 are respectively erected around the bottom of the shaft section three concrete 11 in contact with the lower equipment room concrete layer 13, and round pipe supports 17 are well supported under the steel support plates 16 to ensure that the concrete slurry does not seep out from the edge where the lower equipment room concrete layer 13 contacts the steel support plate 16.

[0056] Step 303: Erect a material guiding pipe 4 in the high-drop shaft, and sequentially carry out segmented concrete pouring for the shaft section one concrete 9, the shaft section two concrete 10, and the shaft section three concrete 11 through the material guiding pipe 4.

[0057] The specific implementation steps of step 303 are as follows:

[0058] After determining that the water supply and drainage steel pipe 6 is firmly fixed to the upper steel frame platform 7 and the lower steel pipe support cylinder 18, place the material guiding pipe 4 to the middle and lower area of the shaft section three concrete 11, and use the concrete transport vehicle 2 to pour the concrete aggregate along the material guiding pipe 11 into the shaft section three concrete 11. The provided material guiding pipe 4 can move in all directions on the steel frame platform 7 and can also be adjusted in the elevation direction to facilitate evenly pouring the concrete aggregate in each area of the shaft section three concrete 11.

[0059] After the concrete poured in the shaft section three concrete 11 reaches the equal-strength strength and can be used as the support formwork for the shaft section two concrete 2, place the material guiding pipe 4 to the middle and lower area of the shaft section two concrete 10, and use the concrete transport vehicle 2 to pour the concrete aggregate along the material guiding pipe 4 into the shaft section two concrete 10, and evenly pour the concrete aggregate in each area of the shaft section two concrete 10.

[0060] After the concrete to be poured in the second section of the shaft reaches the equal-strength level, place the material guide pipe 4 in the middle and lower area of the concrete 9 in the first section of the shaft. Use the concrete transport vehicle 2 to pour the concrete aggregate along the material guide pipe 4 into the concrete 9 in the first section of the shaft, and evenly pour the concrete aggregate in each area of the concrete 9 in the first section of the shaft. After the concrete strength of the concrete 9 in the first section of the shaft reaches the equal-strength level, the concrete backfilling work of the entire high-drop shaft is completed.

Claims

1. A construction method for a high-drop pipe shaft concrete structure with internal pipelines laid, the high-drop pipe shaft concrete structure with internal pipelines laid includes an upper equipment room (8), a lower equipment room (14), a high-drop shaft, and several water supply and drainage steel pipes (6). The high-drop shaft is excavated between the upper equipment room (8) and the lower equipment room (14). The drainage steel pipes (6) are vertically arranged in the high-drop shaft. There is a backfill concrete structure in the high-drop shaft. It is characterized in that, The method includes the following steps: Step 1: First, excavate the upper equipment room (8), the lower equipment room (14), and the traffic tunnel (15). After completing the layout room for the excavation equipment of the high-drop shaft, excavate the high-drop shaft; Step 2: Erect a hoisting device (1) in the upper equipment room (8). Use the hoisting device (1) to lift a number of steel pipe sections (19), and weld and install the steel pipe sections (19) to form a water supply and drainage steel pipe (6); Step 3: Carry out segmented concrete backfilling for the excavated high-drop shaft; Step 2 further includes: Step 201: After the excavation of the high-drop shaft is completed, erect a hoisting device (1) in the upper equipment room (8); Step 202: Use the hoisting device (1) to lift the steel pipe sections (19), and erect a pipeline temporary support platform (20) in the lower equipment room (14) to support the bottom steel pipe sections (19). The hoisting device (1) lifts the steel pipe sections (19) and welds the steel pipe sections (19) in sequence to form a water supply and drainage steel pipe (6); Step 203: Erect a steel platform (7) at the top of the high-drop shaft, and use the steel frame platform (7) to fix the water supply and drainage steel pipe (6) horizontally and in the shaft direction; Step 204: Seal the upper and lower ends of the water supply and drainage steel pipe (6) respectively, and conduct a water pressure test. After confirming that the water pressure test is passed, set up a steel pipe support cylinder (18) at the bottom of the water supply and drainage steel pipe (6); Step 205: Repeat Step 202, Step 203, and Step 204 to complete the installation of all water supply and drainage steel pipes (6) in the high-drop shaft; Step 3 further includes: Step 301: Divide the backfill concrete in the high-drop shaft into three sections, which are, from top to bottom, the shaft first-section concrete (9) of the "T"-shaped concrete structure, the shaft second-section concrete (10) of the cylindrical concrete structure, and the shaft third-section concrete (11) of the inverted "T"-shaped concrete structure; Step 302: Pour the lower equipment room concrete layer (13) at the top of the lower equipment room (14), and at the same time erect a connecting steel pipe (12). The connecting steel pipe (12) is inserted into the concrete layers of the shaft third-section concrete (11) and the lower equipment room concrete layer (13) at the same time. After the lower equipment room concrete layer (13) is completed, erect steel support plates (16) around the bottom of the shaft third-section concrete (11) in contact with the lower equipment room concrete layer (13), and support round pipe columns (17) under the steel support plates (16); Step 303: Erect an adjustable material guiding pipe (4) in the high-drop shaft, and conduct segmented concrete pouring for the shaft third-section concrete (11), the shaft second-section concrete (10), and the shaft first-section concrete (9) in sequence through the material guiding pipe (4); 2. The construction method for a high-drop pipe shaft concrete structure with internal pipelines laid according to claim 1, characterized in that, The method further includes: Step 4: Divide the high-drop pipe well into several section structures, and use the methods of Steps 1-3 for each section structure to construct until the pipeline laying and the construction of the concrete structure in the entire high-drop pipe well are completed.

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