A movable impedance door structure for an inclined tunnel type surge chamber and a construction method thereof

Abstract

The present invention discloses a movable impedance door structure for an inclined tunnel type surge chamber, comprising a reinforced concrete door frame wall horizontally arranged at the opening of an inspection tunnel; a door opening is provided in the reinforced concrete door frame wall, the door opening is provided with a door frame, and an impedance door with an impedance hole is hinged in the door frame; the present invention also discloses a construction method of a movable impedance door structure for an inclined tunnel type surge chamber, comprising the following steps: S1: an inspection tunnel is provided at the intersection of the end of the inclined tunnel surge chamber and the main tunnel; S2: a reinforced concrete door frame wall with a reserved door opening in the middle is provided at the front end of the inspection tunnel; S3: an impedance door with an impedance hole reserved in the door is provided on the reinforced concrete door opening; S4: positioning and installing the impedance door. The present invention not only meets the need for hydraulic impedance during the operation period, but also achieves the purpose of large channel and long distance operation during the inspection period.

Description

Technical Field

[0001] The invention relates to the technical field of pressurized water conveyance tunnel construction, and in particular to a movable impedance door structure for an inclined tunnel type pressure regulating chamber and a construction method thereof. Background Art

[0002] The impedance surge chamber is connected to the pressure waterway (or tail race) with a smaller cross-section pipe (or orifice plate), forming a local impedance to the water flow in and out of the surge chamber. When the load is dropped, water enters the surge chamber from the pressure waterway through the impedance orifice. The impedance effect increases the head loss, and the pressure at the impedance orifice increases, which reduces the pressure difference at both ends of the pressure waterway and reduces the amplitude of the chamber water level fluctuation. When the load is increased, water flows from the surge chamber orifice into the pressure pipe. In order to overcome the impedance, the chamber water level drops less. The impedance surge chamber can be of vertical shaft type or inclined tunnel type. The inclined tunnel surge chamber can not only meet the hydraulic pressure regulation, but also serve as a construction and maintenance branch tunnel.

[0003] However, the impedance holes set in the project are often small in size, equivalent to manholes, and lack the conditions for cars to enter the main tunnel for long-distance maintenance. Therefore, it is of great significance to find a movable impedance structure that has both the impedance voltage regulation function during operation and can be opened as the main tunnel working channel during the maintenance period. Summary of the invention

[0004] In view of this, in order to solve the problems in the prior art, the present invention proposes a movable impedance door structure for an inclined tunnel type surge chamber and a construction method thereof, so as to solve the problem that the impedance type inclined tunnel surge chamber has a small maintenance channel and is not conducive to long-distance maintenance operations.

[0005] The present invention solves the above problems by the following technical means:

[0006] A movable impedance door structure for an inclined tunnel type surge chamber is provided in a maintenance tunnel with a concrete layer on the inner wall, and the movable impedance door structure comprises a reinforced concrete door frame wall transversely arranged at the opening of the maintenance tunnel; the reinforced concrete door frame wall is provided with a door opening, the door opening is provided with a door frame, and an impedance door with an impedance hole is hinged in the door frame;

[0007] The reinforced concrete door frame wall is used to control the size and scale of the impedance door;

[0008] The door opening is used to form a traffic passage in conjunction with the opened impedance door when the inclined tunnel type surge chamber is in the maintenance period;

[0009] The door frame is used to fix the impedance door and bear the load transmitted by the impedance door;

[0010] The impedance hole is used to cooperate with the inspection hole to perform hydraulic pressure regulation when the inclined hole type pressure regulating chamber is in operation;

[0011] The impedance gate is used as a movable component for operations related to the maintenance period and operation period of the inclined tunnel type surge chamber, and is used to simultaneously meet the needs of hydraulic pressure regulation and vehicle maintenance.

[0012] Furthermore, the impedance door comprises a left door leaf having a first notch hinged to the left side of the door frame and a right door leaf having a second notch hinged to the right side of the door frame, wherein the first notch and the second notch are arranged side by side to form an impedance hole.

[0013] Furthermore, the first notch is a notch at the lower right corner of the left door leaf; the second notch is a notch at the lower left corner of the right door leaf.

[0014] Furthermore, a drainage groove is provided at the bottom of the door frame.

[0015] Furthermore, the left door leaf and the right door leaf are both provided with locking devices.

[0016] Furthermore, the cross section of the impedance hole is a combined figure formed by three sides of a rectangle and an arc.

[0017] A method for constructing a movable impedance door structure for an inclined tunnel type surge chamber as described above comprises the following steps:

[0018] S1: A maintenance tunnel is set up at the intersection of the end of the inclined tunnel surge chamber and the main tunnel;

[0019] S2: A reinforced concrete door frame wall with a reserved door opening in the middle is set at the front end of the inspection hole;

[0020] S3: An impedance door with an impedance hole reserved in the door is installed on the reinforced concrete door opening;

[0021] S4: Position and install the impedance gate.

[0022] Furthermore, in S1, a maintenance hole is constructed by drilling and blasting.

[0023] Furthermore, the following steps are included between S1 and S2:

[0024] S121: Spray concrete on the inspection hole or use system anchors for support;

[0025] S122: Cast-in-place concrete to form secondary lining;

[0026] S123: When the secondary lining strength reaches more than 70%, the arch of the inspection hole is backfilled and grouting is carried out to form a concrete layer.

[0027] Furthermore, in S4, a plurality of hooks are arranged at the front edge of the top of the reinforced concrete door opening, and the impedance door is positioned and installed by the hooks.

[0028] Compared with the prior art, the present invention has the following beneficial effects:

[0029] The present invention sets an inspection hole at the end of the inclined hole type surge chamber, arranges an impedance door in front of the hole, and reserves an impedance hole in the door. Through the opening and closing activities of the impedance door, it not only meets the needs of hydraulic impedance during the operation period, but also achieves the purpose of large channel and long-distance operation during the inspection period, solves the problem that the inspection channel of the impedance inclined hole surge chamber is small during the inspection period, which is not conducive to long-distance inspection operations, and the structure is simple and easy to implement, and has good application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 A schematic longitudinal section of a movable impedance door structure for an inclined tunnel type surge chamber according to the present invention;

[0032] Figure 2 for Figure 1 AA cross-section of the structure shown before the impedance gate is installed;

[0033] Figure 3 for Figure 1 AA cross-section of the structure shown after the impedance gate is installed;

[0034] Figure 4 for Figure 2 BB cross-section of the structure shown after the impedance gate is installed;

[0035] Figure 5 for Figure 1 The schematic diagram of the structure of the impedance gate is shown;

[0036] Description of reference numerals:

[0037] Inspection hole 1; concrete layer 14; reinforced concrete door frame wall 2; door opening 21; door frame 22; drainage trough 23; impedance door 3; impedance hole 32; locking device 34; hook 4; inclined tunnel type surge chamber 700; main tunnel 600; tunnel opening 800; ground line 100; colloidal soil layer 200; fully weathered layer 300; strongly weathered layer 400; weakly weathered layer 500; sprayed concrete layer 12; system anchor rod 13; grouting layer 15; hinge 33. DETAILED DESCRIPTION

[0038] In order to make the above-mentioned purposes, features and advantages of the present invention more obvious and easy to understand, the technical solution of the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. It should be pointed out that the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] It should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0040] The terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Thus, a feature defined as "first", "second", and "third" may explicitly or implicitly include one or more of the features.

[0041] Example

[0042] like Figure 2-4 As shown, the present invention proposes a movable impedance door structure for an inclined tunnel type surge chamber, which is arranged in a maintenance tunnel 1 with a concrete layer 14 on the inner wall, and the movable impedance door structure includes a reinforced concrete door frame wall 2 horizontally arranged at the opening of the maintenance tunnel 1; the reinforced concrete door frame wall 2 is provided with a door opening 21, the door opening 21 is provided with a door frame 22, and an impedance door 3 with an impedance hole 32 is hinged in the door frame 22;

[0043] The reinforced concrete door frame wall 2 is used to control the size and scale of the impedance door 3;

[0044] The door opening 21 is used to form a driving passage for long-distance maintenance in conjunction with the opened impedance door 3 when the inclined tunnel type surge chamber is in maintenance period;

[0045] The door frame 22 is used to fix the impedance door 3 and bear the load transmitted by the impedance door 3;

[0046] The impedance hole 32 is used to cooperate with the inspection hole 1 to perform hydraulic pressure regulation when the inclined hole type pressure regulating chamber is in operation;

[0047] The impedance gate 3 is used as a movable component for related operations during the maintenance and operation period of the inclined tunnel type surge chamber, and is used to simultaneously meet the needs of hydraulic pressure regulation and long-distance driving maintenance;

[0048] Specifically, a reinforced concrete door frame wall 2 is set at the front end of the inspection hole 1, and a door opening 21 is reserved in the middle for the passage of cars. Door frames 22 are embedded around the door opening 21, and the door frames 22 are specifically L-shaped steel pads; preferably, in this embodiment, the reinforced concrete door frame wall 2 is about 40 centimeters thick, and the door opening is preferably rectangular, with a net width of about four meters and a net height of about two meters.

[0049] In the present embodiment, the impedance door 3 further comprises a left door leaf having a first notch hinged to the left side of the door frame 22 and a right door leaf having a second notch hinged to the right side of the door frame 22, wherein the first notch and the second notch are arranged side by side to form an impedance hole 32; specifically, the impedance door 3 is preferably but not limited to steel material, and the steel impedance door 3 is divided into two leaves, the left and right sides and the top overlap the reinforced concrete door frame wall 2 by 100 mm, and the bottom overlaps by 150 mm, and a steel pad is provided at the overlap; the left door leaf and the right door leaf are special-shaped steel door panels, and an impedance hole 32 is reserved in the middle and lower parts, and each door panel has a stainless steel hinge 33 on the side; in the present embodiment, A 60mm structural seam is reserved between the left and right special-shaped steel door panels for deformation reserve. The door panels are made of Q345 steel welding. The structure has main steel beams, secondary steel beams, edge steel beams and front and back steel plates. The net width of a single door is 1.68-2.15 meters and the net height is 2.50 meters. The impedance hole is in the shape of a city gate (of course, a rectangular shape can also be selected), with a net width of 1.00 meters and a net height of 1.60 meters, which can also be used as a manhole. Four M50 stainless steel hinges 33 are arranged on the side of each door panel, and the hinges 33 are fully welded to the door panel and the door opening steel pad on both sides. The surface of the left and right door panels is provided with a drinking water grade anti-corrosion coating.

[0050] Specifically, the reinforced concrete door frame wall 2 is used to control the size and scale of the impedance door 3 to facilitate the opening and closing of the door leaf; when the scale of the opening and closing door leaf is determined by the required inspection channel size, the remaining part of the inspection hole is closed with the door frame wall; the door frame 22 is used to fix the impedance door 3 and bear the load transmitted by the door leaf.

[0051] In the present embodiment, the first notch is a notch at the lower right corner of the left door leaf; the second notch is a notch at the lower left corner of the right door leaf.

[0052] In this embodiment, a drainage groove 23 is further provided at the bottom of the door frame 22; specifically, the drainage groove 23 is 0.15 meters high and 1.00 meters wide.

[0053] Furthermore, in this embodiment, the left door leaf and the right door leaf are both provided with a locking device 34. Specifically, under normal conditions, the impedance door 3 is locked to the reinforced concrete door frame wall 2 by the locking device 34. Each door panel has a stainless steel locking device 34 on the side. The locking device 34 includes components such as a lock head, a connecting rod head, a steel swivel arm, a hinge seat, a locking seat and a crank handle. During operation, the impedance door 3 is locked / detached from the reinforced concrete door frame wall 2 by rotating the steel swivel arm.

[0054] In this embodiment, the cross section of the impedance hole 32 is a combination of three sides of a rectangle and an arc.

[0055] like Figure 2-4 As shown, the present invention further proposes a method for constructing a movable impedance door structure for an inclined tunnel type surge chamber as described above, comprising the following steps:

[0056] S1: A maintenance tunnel 1 is set at the intersection of the end of the inclined tunnel surge chamber and the main tunnel;

[0057] S2: A reinforced concrete door frame wall 2 with a reserved door opening 21 in the middle is set at the front end of the inspection hole 1;

[0058] S3: An impedance door 3 with an impedance hole 32 reserved in the door is provided on the reinforced concrete door opening 21;

[0059] S4: Position and install impedance gate 3.

[0060] Specifically, Figure 1 As shown, a drilling and blasting maintenance tunnel 1 is set at the intersection of the end of the inclined tunnel surge chamber and the main tunnel, and a steel impedance door 3 is set at the front end of the tunnel. The inclined tunnel surge chamber still has impedance function during operation, and a car can be driven directly into the main tunnel from the tunnel entrance during maintenance. It should be noted that Figure 1 The “inclined tunnel type surge chamber 700”, “main tunnel 600”, “tunnel entrance 800”, “ground line 100”, “colluvial soil layer 200”, “fully weathered layer 300”, “strongly weathered layer 400” and “weakly weathered layer 500” shown therein are all common knowledge in the industry.

[0061] In this embodiment, further, in S1, a maintenance tunnel 1 is constructed by drilling and blasting; specifically, a drilling and blasting maintenance tunnel 1 is set at the intersection of the end of the inclined tunnel surge chamber and the main tunnel, and after the excavation of the cavern is completed, concrete is sprayed to form a sprayed concrete layer 12, and system anchor rods 13 are used for support, and then cast-in-place molded concrete secondary lining is implemented to form a concrete layer 14, and when the strength of the secondary lining reaches more than 70%, the arch is backfilled and grouted to form a grouting layer 15; in the optimization of this implementation, the drilling and blasting maintenance tunnel is in the shape of a city gate tunnel (of course, a horseshoe shape can also be selected), with a net width of 5.36 meters, a net height of 5.28 meters, and a secondary lining thickness of 40 centimeters.

[0062] In this embodiment, the following steps are further included between S1 and S2:

[0063] S121: spraying concrete on the inspection tunnel 1, or using the system anchor rod 13 for support; specifically, the inspection tunnel 1 can be used as a construction branch tunnel of the main tunnel during the construction period. When the inspection tunnel 1 is located in the Class II surrounding rock section, spraying concrete is used for initial support. When the inspection tunnel 1 is located in the Class III surrounding rock section, a combination of spraying concrete and system anchor rod 13 is used for initial support.

[0064] S122: Cast-in-place concrete to form secondary lining;

[0065] S123: When the secondary lining strength reaches more than 70%, backfill grouting is performed on the arch of the inspection hole 1 to form a concrete layer 14.

[0066] In this embodiment, in S4, a plurality of hooks 4 (such as Figure 4 As shown, Figure 4 The arrow on the left indicates the direction of the main tunnel. Figure 4 The direction of the arrow on the right is the direction of the inclined hole type surge chamber), and the impedance door 3 is positioned and installed through the hook 4.

[0067] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A movable impedance door structure for an inclined tunnel type surge chamber, arranged in a maintenance tunnel (1), wherein the inner wall of the maintenance tunnel (1) is provided with a concrete layer (14), characterized in that: The movable impedance door structure comprises a reinforced concrete door frame wall (2) transversely arranged at the opening of an inspection hole (1); the reinforced concrete door frame wall (2) is provided with a door opening (21); the door opening (21) is provided with a door frame (22); an impedance door (3) having an impedance hole (32) is hingedly connected in the door frame (22); The reinforced concrete door frame wall (2) is used to control the size and scale of the impedance door (3); The door opening (21) is used to form a traffic passage in cooperation with the opened impedance door (3) when the inclined tunnel type surge chamber is in the maintenance period; The door frame (22) is used to fix the impedance door (3) and bear the load transmitted by the impedance door (3); The impedance hole (32) is used to cooperate with the inspection hole (1) to perform hydraulic pressure regulation when the inclined hole type pressure regulating chamber is in operation; The impedance gate (3) is used as a movable component for operations related to the maintenance period and operation period of the inclined tunnel type surge chamber, and is used to simultaneously meet the needs of hydraulic pressure regulation and vehicle maintenance; The impedance door (3) comprises a left door leaf having a first notch and hinged to the left side of the door frame (22) and a right door leaf having a second notch and hinged to the right side of the door frame (22), wherein the first notch and the second notch are arranged side by side to form an impedance hole (32).

2. The movable impedance door structure for the inclined cave type surge chamber according to claim 1 is characterized in that: The first notch is a notch at the lower right corner of the left door leaf; the second notch is a notch at the lower left corner of the right door leaf.

3. The movable impedance door structure for the inclined cave type surge chamber according to claim 1 is characterized in that: The bottom of the door frame (22) is provided with a drainage groove (23).

4. The movable impedance door structure for the inclined cave type surge chamber according to claim 1 is characterized in that: The left door leaf and the right door leaf are both provided with a locking device (34).

5. The movable impedance door structure for the inclined cave type surge chamber according to claim 1 is characterized in that: The cross section of the impedance hole (32) is a combined figure formed by three sides of a rectangle and an arc.

6. A method for constructing a movable impedance door structure for an inclined tunnel type surge chamber as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: S1: A maintenance tunnel (1) is set at the intersection of the end of the inclined tunnel surge chamber and the main tunnel; S2: A reinforced concrete door frame wall (2) with a reserved door opening (21) in the middle is arranged at the front end of the inspection hole (1); S3: An impedance door (3) having an impedance hole (32) reserved in the door is arranged on the reinforced concrete door opening (21); S4: Position and install the impedance gate (3).

7. The method for constructing a movable impedance door structure for an inclined tunnel type surge chamber according to claim 6, characterized in that: In S1, a maintenance tunnel (1) is constructed by drilling and blasting.

8. The method for constructing a movable impedance door structure for an inclined tunnel type surge chamber according to claim 6, characterized in that: The following steps are also included between S1 and S2: S121: spray concrete on the inspection hole (1), or use system anchor rods for support; S122: Cast-in-place concrete to form secondary lining; S123: When the secondary lining strength reaches more than 70%, the arch of the inspection hole (1) is backfilled and grouted to form a concrete layer (14).

9. The method for constructing a movable impedance door structure for an inclined tunnel type surge chamber according to claim 6, characterized in that: In S4, a plurality of hooks (4) are arranged at the top front edge of the reinforced concrete door opening (21), and the impedance door (3) is positioned and installed by the hooks (4).

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