A combined structure and construction method within a tunnel drainage system

Abstract

The present invention discloses a combined structure and construction method in a tunnel drainage system, wherein the combined structure comprises: a main tunnel; an inclined shaft, which is arranged on one side of the main tunnel and connected to the main tunnel in a local uphill form; and a pump room functional structure, which is arranged inside the inclined shaft and includes a personnel equipment room, a sedimentation tank, a water collection tank and an emergency water tank in sequence from the access end. The construction method comprises the following steps: step one, constructing the inclined shaft; step two, completing the main structure of the tunnel by using the inclined shaft construction, and constructing a water intercepting ditch; step three, performing secondary lining on the inclined shaft, and constructing the pump room functional structure in the inclined shaft; step four, decorating the pump room functional structure and installing equipment. The present invention saves the amount of pump room engineering, reduces the risk of pump room excavation, and expands the use function of the inclined shaft in the operation stage by combining the inclined shaft and the main tunnel pump room; the internal structure is constructed by using the inclined shaft to form a pump room, thereby saving the amount of earthwork and lining engineering for building a pump room separately.

Description

Technical Field

[0001] The present invention relates to the technical field of tunnel construction, and in particular to a combined structure and a construction method in a tunnel drainage system. Background Art

[0002] The pump house is an important part of the drainage system of the tunnel project. It is responsible for collecting water from structural leakage, track scouring and firefighting, and draining it outside the tunnel. Generally, a pump house is set at the lowest point of a non-one-way slope tunnel. Long and large tunnels or tunnels in areas with abundant groundwater are equipped with multiple pump houses at the lowest point and uphill and downhill sections to intercept upstream wastewater at high altitudes and collect it in a dispersed manner, thereby achieving the purpose of energy saving and multiple protection.

[0003] Pump room construction is a link with prominent risks in tunnel construction. The main reason is that the pump room is usually set up between the left and right tunnels and connected to the tunnels through a transverse passage, facing the risks of "small clearance tunnel construction" and "cross-chamber construction"; secondly, in order to meet the functional requirements of water collection and pumping, the pump room sump must have a certain depth, so it faces the risks of high-section excavation, support, and vertical slag discharge in the tunnel; in addition, the pump room of some large tunnels also has the functions of power distribution and follow-up, with complex structure and large scale. Taking the section between Wuyuanwan Station and Liuwudian Station of Xiamen Metro Line 3 under construction as an example, there are three large pump rooms in the main section. The pump room has a two-story structure, with the lower floor being the sump and the upper floor being the substation, spare parts warehouse, duty room, control room, etc. The earthwork excavation volume of a single pump room reaches 14,000m 3 It is easy to imagine how difficult it is to excavate such a huge pump room within the limited tunnel space.

[0004] Inclined shaft is an auxiliary tunnel used in the process of tunnel construction. It cuts into the middle section of the line from the ground via a shorter path, opens up a working surface and excavates towards the two end openings to speed up the overall progress of the project. For tunnel projects in the field of transportation, there are three ways to deal with inclined shafts after the main body of the tunnel is completed: (1) blocking or backfilling, such as the blocking of the four inclined shafts of the Nanluliangshan Tunnel Project of the Wanji Railway; (2) transforming the inclined shaft into a ventilation lane or rescue evacuation channel, such as the Longtan Tunnel of the Shanghai-Chengdu West Expressway, which has two inclined shafts on each side of the left and right lines to divide the main tunnel into three sections for ventilation.

[0005] From the above analysis, it can be seen that for tunnels with both pump rooms and inclined shafts, the construction of the pump room is difficult and risky; on the other hand, if the main tunnel does not require additional ventilation tunnels or rescue and evacuation passages, the inclined shaft cannot be fully utilized during operation. Summary of the invention

[0006] The purpose of the present invention is to provide a combined structure and construction method within a tunnel drainage system, which can save pump room engineering workload, reduce the risk of pump room excavation, and expand the use function of the inclined shaft during the operation stage.

[0007] To achieve the above-mentioned purpose, the specific technical solution of the combined structure and construction method in a tunnel drainage system of the present invention is as follows:

[0008] A combined structure within a tunnel drainage system comprises: a main tunnel; an inclined shaft, arranged on one side of the main tunnel and connected to the main tunnel via a local uphill approach; and a pump room functional structure, arranged inside the inclined shaft, including a personnel and equipment room, a sedimentation tank, a water collection tank and an emergency water tank in sequence from the access end.

[0009] A construction method of a combined structure in a tunnel drainage system, comprising the following steps:

[0010] Step 1: construct an inclined shaft;

[0011] Step 2: Use the inclined shaft to complete the main structure of the tunnel and construct the intercepting ditch;

[0012] Step 3: Perform secondary lining on the inclined shaft and construct the pump room functional structure in the inclined shaft;

[0013] Step 4: Decorate the functional structure of the pump room and install equipment.

[0014] The advantages of the combined structure and construction method in a tunnel drainage system of the present invention are:

[0015] 1) By combining the inclined shaft and the main tunnel pump house, the pump house construction workload can be saved, the risk of pump house excavation can be reduced, and the use function of the inclined shaft in the operation stage can be expanded;

[0016] 2) Using the inclined shaft to construct the internal structure to form the pump house saves the earthwork and lining work required to build a separate pump house;

[0017] 3) The amount of excavation at tunnel intersections and high sections is reduced, which reduces the risk of pump house construction;

[0018] 4) The utilization rate of inclined shaft tunnels has been improved, especially the usage functions in the operation stage have been expanded. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic plan view of the combined structure in the tunnel drainage system of the present invention;

[0020] Figure 2 It is a cross-sectional schematic diagram of the present invention along the center line of the intercepting ditch and the diversion ditch;

[0021] Figure 3 It is a cross-sectional view of the pump room functional structure in the personnel and equipment room of the present invention.

[0022] In the figure: 1. Inclined shaft; 2. Main tunnel; 3. Intercepting ditch; 4. Diversion ditch; 5. Sedimentation tank; 6. Water collection tank; 7. Emergency water tank; 8. Personnel and equipment room; 9. No. 1 fire evacuation passage; 10. No. 2 fire evacuation passage; 11. Longitudinal ditch; 12. Overflow. DETAILED DESCRIPTION

[0023] In order to better understand the purpose, structure and function of the present invention, the combined structure and construction method in a tunnel drainage system of the present invention are further described in detail below in conjunction with the accompanying drawings.

[0024] like Figures 1 to 3 As shown, it shows a combined structure and construction method in a tunnel drainage system of the present invention, the combined structure includes a main tunnel 2, an inclined shaft 1 is arranged on one side of the main tunnel 2, and a pump room functional structure is arranged inside the inclined shaft 1. Specifically, the inclined shaft 1 is connected to the main tunnel 2 in a local uphill form, and after the main tunnel 2 is completed, the pump room functional structure is constructed inside the inclined shaft 1. Figure 2 As shown, the longitudinal section of the inclined shaft 1 in the present invention is a V-shaped slope or a W-shaped slope, that is, starting from the entrance of the inclined shaft 1 on the ground, it first goes downhill, then uphill, and the end point is connected to the main tunnel 2. The inclined shaft is used as an auxiliary tunnel to provide transportation, ventilation, and drainage during the construction period, and is used as the main tunnel pump room and its power distribution follower after transformation during the operation period.

[0025] Furthermore, the functional structure of the pump room includes, from the access end, a personnel equipment room 8, a sedimentation tank 5, a water collection tank 6 and an emergency water tank 7 separated by walls, each of which is a relatively independent area, and the staff can move to any of them through doors and corridors. Figure 3 As shown, the lower part of the cross section of the pump room functional structure is a plain concrete backfill layer, the top surface of the backfill layer in the personnel equipment room 8 is flush, a cable trench is reserved in the backfill layer, and a concrete cover is provided on the upper part of the trench.

[0026] In addition, the pump room functional structure is connected to the main tunnel 2 through at least two independent fire evacuation passages, including a first fire evacuation passage 9 and a second fire evacuation passage 10. Figure 3 As shown, the first fire escape passage 9 is arranged along one side of the inclined shaft 1 and is separated from the personnel equipment room 8 by a wall; the second fire escape passage 10 vertically connects the inclined shaft 1 with the main tunnel 2 to ensure that when any point in the functional structure of the pump room catches fire, personnel have at least one escape passage to the main tunnel 2.

[0027] Furthermore, a cut-off ditch 3 is provided in the main tunnel 2, and a diversion ditch 4 is provided in the inclined shaft 1. The bottoms of the cut-off ditch 3 and the diversion ditch 4 are one-way slopes, and the bottom elevation gradually decreases toward the sedimentation tank 5 and the water collection tank 6. The cut-off ditch 3 intersects with the longitudinal ditch 11 of the main tunnel 2, and the diversion ditch 4 is arranged along the direction of the inclined shaft 1. The cut-off ditch 3 and the diversion ditch 4 are connected with the sedimentation tank 5, the water collection tank 6, and the emergency water tank 7 in sequence. The water flow in the longitudinal ditch 11 in the main tunnel 2 is intercepted by the cut-off ditch 3, flows into the diversion ditch 4 along the slope, and then flows into the sedimentation tank 5 to remove coarse particle impurities, and then flows into the water collection tank 6.

[0028] Among them, the water diversion ditch 4 is arranged below the first fire escape passage 9. The water diversion ditch 4 is a dark ditch type. A concrete cover plate is arranged on the upper part of the groove of the water diversion ditch 4 to isolate water vapor and facilitate people to walk. An inspection well is arranged every 14 to 16 meters (preferably 15 meters) in the dark ditch.

[0029] Further, if Figure 2 As shown, an overflow port 12 is arranged on the partition wall between the water collection tank 6 and the emergency water tank 7 in the functional structure of the pump room. The bottom elevation of the overflow port 12 is lower than the elevation of the main tunnel 2 road surface at the access point of the inclined shaft 1, so as to ensure that the water level in the water collection tank 6 is always lower than the main tunnel 2 road surface, which means that the water in the intercepting ditch 3 and the water diversion ditch 4 can always maintain unidirectional flow.

[0030] Furthermore, the emergency water tank 7 utilizes the remaining section of the inclined shaft after the overflow port 12. Its function is that when there is a power outage or a water pump failure and the water collection tank 6 cannot pump out water normally, the bottom plate of the emergency water tank 7 is the bottom plate of the inclined shaft 1. The overflowing water enters the emergency water tank 7 through the overflow port 12, flows to the lowest point along the slope of the inclined shaft 1, and is pumped out of the tunnel through the entrance of the inclined shaft 1 through the backup power supply and the submersible pump at the lowest point.

[0031] The present invention also discloses a construction method for combining an inclined shaft with a main tunnel pump room, comprising the following steps:

[0032] Step 1: construct the inclined shaft 1, including earth excavation, initial support, and secondary lining;

[0033] Specifically, the mining method is adopted to construct inclined shaft 1, including earth excavation, initial support and secondary lining. The clearance size in the inclined shaft must meet the needs of construction transportation and ventilation as well as the needs of the subsequent pump room merger and setting.

[0034] Step 2: Use the inclined shaft 1 to complete the main structure of the main tunnel 2 and construct the intercepting ditch 3. After the inclined shaft 1 is connected to the line position of the main tunnel 2, it is excavated toward the entrance of the main tunnel 2 to complete the main tunnel 2.

[0035] Step three, carry out secondary lining of inclined shaft 1 according to the functional requirements of the pump room, and construct the functional structure of the pump room in the inclined shaft.

[0036] Specifically, the internal structure of the inclined shaft 1 is constructed, and the inclined shaft arch is backfilled with plain concrete to form the floor of the personnel and equipment room 8. During the backfilling process, a water diversion ditch 4 and a cable trench in the room are reserved, and the sedimentation tank 5, water collection tank 6, emergency water tank 7, and structural walls between and within the personnel and equipment room 8 are constructed.

[0037] Step 4: Decorate the functional structure of the pump room and install equipment.

[0038] Specifically, install the water pumps and pipes required for the operation of the pump room, as well as the power supply, ventilation and lighting equipment.

[0039] The present invention provides a combined structure and construction method within a tunnel drainage system, which combines the inclined shaft and the main tunnel pump room, thereby saving the pump room engineering workload, reducing the risk of pump room excavation, and expanding the use function of the inclined shaft in the operation stage; using the inclined shaft to construct the internal structure to form the pump room, saving the earthwork and lining engineering workload of building a pump room separately; reducing the excavation volume of tunnel intersection nodes and high sections, reducing the risk of pump room construction; improving the utilization rate of the inclined shaft tunnel, and especially expanding the use function in the operation stage.

[0040] The present invention is further described above with the aid of specific embodiments. However, it should be understood that the specific description here should not be construed as limiting the essence and scope of the present invention. Various modifications made to the above embodiments by ordinary technicians in the field after reading this specification are all within the scope of protection of the present invention.

Claims

1. A merging structure in a tunnel drainage system, characterized in that: include: Main tunnel (2); An inclined shaft (1) is arranged on one side of the main tunnel (2) and is connected to the main tunnel (2) through a local uphill approach; The inclined shaft is used as an auxiliary tunnel to provide transportation, ventilation and drainage during the construction period, and is used as the main tunnel pump room and its power distribution follower after transformation during the operation period; The pump room functional structure is arranged inside the inclined shaft (1), and includes, from the access end, a personnel equipment room (8), a sedimentation tank (5), a water collection tank (6), and an emergency water tank (7); The longitudinal section of the inclined shaft (1) is V-shaped or W-shaped; A water intercepting ditch (3) is provided in the main tunnel (2), and a water diversion ditch (4) is provided in the inclined shaft (1). The bottoms of the water intercepting ditch (3) and the water diversion ditch (4) are unidirectionally sloped, and the elevation of the bottom of the ditch gradually decreases toward the sedimentation tank (5) and the water collection tank (6). The water diversion ditch (4) is provided below the first fire evacuation passage (9); The intercepting ditch (3) intersects with the longitudinal ditch (11) of the main tunnel (2); the diversion ditch (4) is arranged along the direction of the inclined shaft (1); the intercepting ditch (3), the diversion ditch (4) are connected to the sedimentation tank (5), the water collection tank (6), and the emergency water tank (7) in sequence; An overflow port (12) is arranged on the partition wall between the water collection tank (6) and the emergency water tank (7) in the pump room functional structure, and the bottom elevation of the overflow port (12) is lower than the road surface elevation of the main tunnel (2) at the access point of the inclined shaft (1).

2. The merging structure in a tunnel drainage system according to claim 1, characterized in that: The pump room functional structure is connected to the main tunnel (2) through at least two independent fire escape passages, including: A first fire escape passage (9) is arranged along one side of the inclined shaft (1) and is separated from the personnel equipment room (8) by a wall; The second fire escape passage (10) is vertically connected between the inclined shaft (1) and the main tunnel (2).

3. The merging structure in a tunnel drainage system according to claim 1, characterized in that: The water diversion ditch (4) is of a blind ditch type, and a concrete cover plate is provided on the upper part of the ditch of the water diversion ditch (4).

4. A construction method for a combined structure in a tunnel drainage system according to any one of claims 1 to 3, characterized in that: The following steps are involved: Step 1, constructing an inclined shaft (1); Step 2: Use the inclined shaft (1) to complete the main structure of the main tunnel (2) and construct the intercepting ditch (3); Step 3, performing secondary lining on the inclined shaft (1) and constructing a pump room functional structure in the inclined shaft (1); Step 4: Decorate the functional structure of the pump room and install equipment.

5. The construction method of a combined structure in a tunnel drainage system according to claim 4, characterized in that: The inclined shaft (1) is constructed using the mining method, including earth excavation, initial support, and secondary lining. The clearance size in the inclined shaft must meet the needs of construction transportation and ventilation, as well as the needs of the subsequent pump room integration and installation.

6. The construction method of a combined structure in a tunnel drainage system according to claim 4, characterized in that: In step three, the inclined shaft invert is backfilled with plain concrete in the inclined shaft (1) to form the floor of the personnel equipment room (8). During the backfilling process, a water diversion ditch (4) and a cable trench in the room are reserved, and structural walls between and within the sedimentation tank (5), the water collection tank (6), the emergency water tank (7) and the personnel equipment room (8) are constructed.

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