Construction method of diversion discharge hole inlet structure

Abstract

The invention relates to a construction method for an inlet structure of a diversion discharge hole, the construction method is used for constructing the inlet structure of the diversion discharge hole, the inlet structure comprises an inlet concrete structure and a blocking gate, the construction method comprises the following steps: carrying out excavation construction on an inlet slope and a hole body, and arranging anchor bars in a foundation range of the inlet concrete structure; bottom plate concrete of the imported concrete structure is poured, and then foundation consolidation grouting is conducted; an upper concrete structure of the inlet concrete structure is poured, a water stop is reserved, and when the lining in the chamber is poured firstly, the water stop is reserved in the lining section of the chamber; a cavity between the inlet concrete structure and the inlet slope is subjected to concrete backfilling treatment; during the water storage period, the blocking gate is firstly lowered, and then the flow guide discharge hole gate is lowered for gate lowering and water storage. The diversion discharge hole inlet structure constructed by the construction method can effectively solve the problems of low inlet elevation and clogging during operation in diversion hole reconstruction engineering.

Description

Technical Field

[0001] This application relates to the technical field of diversion tunnel reconstruction projects, and specifically relates to a construction method for the inlet structure of a diversion and discharge tunnel. Background Art

[0002] The entrances of diversion tunnels are generally set relatively low. In the projects of reconstructing diversion tunnels into permanent emptying tunnels or flood discharge tunnels, most of them have the problem of needing to raise the inlet elevation, such as adopting the "dragon head up" scheme. Summary of the Invention

[0003] This application provides a construction method for the inlet structure of a diversion and discharge tunnel, which is used for constructing the inlet structure of the diversion and discharge tunnel. The inlet structure after construction includes an inlet concrete structure and a plugging gate. This inlet structure can effectively overcome the problems of low inlet elevation and siltation during operation existing in the diversion tunnel reconstruction project.

[0004] The construction method for the inlet structure of the diversion and discharge tunnel provided by this application includes the following steps:

[0005] 1) Carry out the construction of the inlet slope and tunnel body excavation, and drive anchor bars within the foundation range of the inlet concrete structure;

[0006] 2) Pour the bottom slab concrete of the inlet concrete structure, and then carry out foundation consolidation grouting;

[0007] 3) Pour the upper concrete structure of the inlet concrete structure, reserve the water stop. When the lining in the chamber is poured first, reserve the water stop in the lining section of the chamber;

[0008] 4) Backfill the cavity existing between the inlet concrete structure and the inlet slope with concrete;

[0009] 5) During the water storage period, first lower the plugging gate, and then lower the diversion and discharge tunnel gate to close the sluice for water storage.

[0010] In addition, the construction method for the inlet structure of the diversion and discharge tunnel provided by this application also has the following additional technical features:

[0011] In an alternative solution, in the constructed inlet structure, the inlet concrete structure has a first channel and a second channel. The first channel has a horizontally arranged inlet and a connecting opening arranged opposite to each other. The connecting opening is connected to the entrance of the diversion tunnel. The second channel extends vertically and communicates with the first channel. The second channel has a shaft inlet, and the shaft inlet is located at the top of the inlet concrete structure; the plugging gate is located on one side of the first channel close to the horizontal inlet.

[0012] In an alternative solution, in the imported structure after construction, the orifice elevation of the shaft inlet needs to be higher than the sedimentation elevation of the inlet slope and lower than the dead water level; the flow-through space of the shaft inlet needs to be larger than the cross-sectional area of the diversion tunnel body to reduce the flow velocity and the local head loss in the inlet section.

[0013] In an alternative solution, during the construction of the imported concrete structure, the imported concrete structure is fixed by a plurality of anchor bars driven downward. The plurality of anchor bars are arranged at intervals within the foundation range of the concrete structure, and the cavity between the concrete structure and the inlet slope is filled with backfill concrete.

[0014] In an alternative solution, during the construction of the imported concrete structure, a water stop structure needs to be provided at the connection between the connection opening and the diversion tunnel. The water stop structure includes a plurality of copper water stops arranged on the inner wall at the connection between the first channel and the diversion tunnel.

[0015] In an alternative solution, the plugging gate after construction is a concrete laminated beam gate. A plurality of pressure equalizing holes need to be opened on the lowermost laminated beam of the concrete laminated beam gate. The pressure equalizing holes are used to reduce the buoyancy caused by the internal and external pressure difference during the period before the water storage level reaches the shaft inlet.

[0016] The beneficial effects of this application are as follows:

[0017] The construction method of the diversion and discharge tunnel inlet structure in this application improves the imported concrete structure. During the diversion period, it can discharge through the low-level horizontal inlet. After the diversion function ends, the plugging gate is lowered for plugging. During the permanent operation period, the shaft inlet can be used for water intake, thus changing the problem of siltation and blockage during the permanent operation period of the diversion and discharge tunnel inlet. The shaft inlet in the shape of a vertical upward bulge can also reduce the risk of the inlet excavation slope collapsing and blocking the tunnel opening. Its structural form is simple, the construction is convenient, and it can effectively save investment.

[0018] It should be understood that the above general description and the following detailed description are only exemplary and do not limit this application. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional view of the imported concrete structure provided by this application in a specific embodiment;

[0020] Figure 2 For Figure 1 The schematic plan view of the imported concrete structure in;

[0021] Figure 3 For Figure 1 The upstream elevation view of the imported concrete structure in;

[0022] Figure 4 is Figure 1 a schematic cross - section view of the imported concrete structure at the shaft inlet position in the middle.

[0023] Reference numerals: imported concrete structure 1, first channel 11, second channel 12, horizontal inlet 13, connecting opening 14, shaft inlet 15, diversion tunnel 2, blocking gate 3, anchor bars 4, backfill concrete 5, water - stop structure 6, inlet slope 7, natural slope 8.

[0024] The accompanying drawings here are incorporated into the specification and form a part of this specification, showing embodiments in accordance with the present application, and are used together with the specification to explain the principles of the present application. Detailed embodiments

[0025] To better understand the technical solution of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0026] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. All other technical solutions obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0027] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms of "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0028] It should be understood that the term "and / or" used herein is only a description of the associated relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0029] It should be noted that the orientation terms such as "upper", "lower", "left", "right" described in the embodiments of the present application are described from the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of the present application. In addition, in the context, it should also be understood that when it is mentioned that an element is connected "above" or "below" another element, it can not only be directly connected "above" or "below" another element, but also be indirectly connected "above" or "below" another element through an intermediate element.

[0030] Such as Figures 1-4As shown in the figure, an embodiment of the present application provides a construction method for the inlet structure of a diversion and discharge tunnel, which is used for constructing the inlet structure of the diversion and discharge tunnel. The inlet structure after construction includes an inlet concrete structure 1 and a plugging gate 3. The construction method includes the following steps:

[0031] 1) Carry out the construction of the inlet slope 7 and the tunnel body excavation, and drive anchor bars 4 within the foundation range of the inlet concrete structure 1;

[0032] 2) Pour the bottom slab concrete of the inlet concrete structure 1, and then carry out the foundation consolidation grouting;

[0033] 3) Pour the upper concrete structure of the inlet concrete structure 1, and reserve the water stop. When the lining in the tunnel is poured first, reserve the water stop in the tunnel lining section;

[0034] 4) Carry out the treatment of backfilling concrete 5 for the cavity existing between the inlet concrete structure 1 and the inlet slope 7;

[0035] 5) During the water storage period, first lower the plugging gate 3, and then lower the diversion and discharge tunnel gate to close the gate for water storage.

[0036] As Figures 1-4 shown, in a specific embodiment, the inlet structure after construction mainly includes an inlet concrete structure 1 and a plugging gate 3. The inlet concrete structure 1 has a first channel 11 and a second channel 12. The first channel 11 has a horizontally arranged inlet 13 and a connecting opening 14 arranged opposite to each other. The connecting opening 14 is connected to the opening of the diversion tunnel 2. The second channel 12 extends vertically and is communicated with the first channel 11. The second channel 12 has a shaft inlet 15, and the shaft inlet 15 is located at the top of the inlet concrete structure 1; the plugging gate 3 is located on one side of the first channel 11 close to the horizontal inlet 13, and the plugging gate 3 can close the horizontal inlet 13. When the reservoir stores water, the emergency gate arranged in the diversion tunnel 2 is used to close the gate for water storage. The main function of the plugging gate 3 arranged in the inlet section is to prevent silt from entering the inlet of the diversion tunnel 2 during normal operation and affect the drainage safety.

[0037] In this embodiment, the imported concrete structure 1 is divided into three parts according to its functions, namely the upstream horizontal inlet 13, the middle shaft inlet 15, and the downstream connection opening 14. The function of the upstream horizontal inlet 13 is the inlet of the diversion tunnel 2, and a stop gate 3 is arranged inside this part of the structure. The middle shaft inlet 15 is the inlet of the discharge tunnel, and the downstream connection opening 14 is used to connect the imported concrete structure 1 and the diversion tunnel 2. During the diversion period, the low-level horizontal inlet 13 can be used for drainage. After the diversion function is completed, the stop gate 3 is lowered for blocking. During the permanent operation period, the shaft inlet 15 is used for water intake, thus changing the problem of siltation and blockage at the inlet of the diversion and discharge tunnel during the permanent operation period. The shaft inlet 15 that protrudes upward in a shaft shape can also reduce the risk of the inlet excavation slope collapsing and blocking the opening. Its structural form is simple, the construction is convenient, and it can effectively save investment.

[0038] As Figures 1-4 shown, in a specific embodiment, the orifice elevation of the shaft inlet 15 is higher than the siltation elevation of the inlet slope 7 (the inlet slope 7 is formed by excavating the natural slope 8), and is lower than the dead water level; the flow-through space of the shaft inlet 15 is larger than the cross-sectional area of the tunnel body of the diversion tunnel 2 to reduce the flow velocity and the local head loss at the inlet section. In addition, when constructing the imported concrete structure 1, the imported concrete structure 1 is fixed by a plurality of anchor bars 4 driven downward. The plurality of anchor bars 4 are arranged at intervals within the foundation range of the concrete structure, and the cavity between the concrete structure and the inlet slope 7 is filled with backfill concrete 5.

[0039] As Figures 1-4 shown, in a specific embodiment, when constructing the imported concrete structure 1, a water stop structure 6 needs to be set at the connection between the connection opening 14 and the diversion tunnel 2. The water stop structure 6 includes a plurality of copper water stops arranged on the inner wall at the connection between the first channel 11 and the diversion tunnel 2. The constructed stop gate 3 is a concrete laminated beam gate, and a plurality of equalizing holes are opened on the lowermost laminated beam of the concrete laminated beam gate. The equalizing holes are used during the period before the water storage level reaches the shaft inlet 15, so that the water level in the inner cavity of the inlet rises with the rise of the water storage level, thereby reducing the buoyancy problem caused by the internal and external pressure difference.

[0040] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A construction method for the inlet structure of a diversion and discharge tunnel, which is used for constructing the inlet structure of the diversion and discharge tunnel, and is characterized in that, The inlet structure includes an inlet concrete structure and a plugging gate, and the construction method includes the following steps: 1) Carry out the excavation construction of the inlet slope and the tunnel body, and drive anchor bars within the foundation range of the inlet concrete structure; 2) Pour the bottom slab concrete of the inlet concrete structure, and then carry out foundation consolidation grouting; 3) Pour the upper concrete structure of the inlet concrete structure, and reserve waterstops. When the lining in the tunnel is poured first, reserve waterstops in the lining section of the tunnel; 4) Backfill the cavity existing between the inlet concrete structure and the inlet slope with concrete; 5) During the water storage period, first lower the plugging gate, and then lower the gate of the diversion and discharge tunnel to close the sluice for water storage.

2. The construction method of the inlet structure of the diversion and discharge tunnel according to claim 1, characterized in that, In the constructed inlet structure, the inlet concrete structure has a first channel and a second channel. The first channel has a horizontally arranged inlet and a connecting opening arranged opposite to each other. The connecting opening is connected to the opening of the diversion tunnel. The second channel extends vertically and communicates with the first channel. The second channel has a shaft inlet, and the shaft inlet is located at the top of the inlet concrete structure; the plugging gate is located on one side of the first channel close to the horizontal inlet.

3. The construction method of the inlet structure of the diversion and discharge tunnel according to claim 2, characterized in that, In the constructed inlet structure, the elevation of the orifice of the shaft inlet needs to be higher than the siltation elevation of the inlet slope and lower than the dead water level; the flow-through space of the shaft inlet needs to be larger than the cross-section of the tunnel body of the diversion tunnel to reduce the flow velocity and the local head loss at the inlet section.

4. The construction method of the inlet structure of the diversion and discharge tunnel according to claim 2, characterized in that, When constructing the inlet concrete structure, the inlet concrete structure is fixed by driving a plurality of anchor bars downward. The plurality of anchor bars are arranged at intervals within the foundation range of the concrete structure, and the cavity between the concrete structure and the inlet slope is filled with backfill concrete.

5. The construction method of the inlet structure of the diversion and discharge tunnel according to any one of claims 2-4, characterized in that, When constructing the inlet concrete structure, a waterstop structure needs to be arranged at the connection between the connecting opening and the diversion tunnel. The waterstop structure includes a plurality of copper waterstops arranged on the inner walls at the connection between the first channel and the diversion tunnel.

6. The construction method of the inlet structure of the diversion and discharge tunnel according to any one of claims 2-4, characterized in that The constructed plugging gate is a concrete laminated beam gate. A plurality of pressure equalizing holes need to be opened on the lowest laminated beam of the concrete laminated beam gate. The pressure equalizing holes are used to reduce the buoyancy caused by the internal and external pressure difference during the period before the water storage level reaches the shaft inlet.

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