CN212896240U

CN212896240U - Quick block structure of interim shutoff of diversion tunnel import

Info

Publication number: CN212896240U
Application number: CN202021378079.9U
Authority: CN
Inventors: 王瑞
Original assignee: China Hydropower Consulting Group Guiyang Survey And Design Institute Of Geotechnical Engineering Co ltd; PowerChina Guiyang Engineering Corp Ltd
Current assignee: China Hydropower Consulting Group Guiyang Survey And Design Institute Of Geotechnical Engineering Co ltd; PowerChina Guiyang Engineering Corp Ltd
Priority date: 2020-07-14
Filing date: 2020-07-14
Publication date: 2021-04-06
Anticipated expiration: 2030-07-14

Abstract

The utility model provides a quick block structure of interim shutoff of diversion tunnel import, including setting up in the door well of diversion tunnel import department, offered the gate slot along circumference in the door well, the caulking groove has been offered along circumference respectively to the upper reaches side of gate slot and downstream side in the door well, and the gate slot all link up the door well with the upper end of caulking groove, and two steel sheets extend in the gate well and the caulking groove by the upper end of the caulking groove of last downstream side respectively, and has backfilled the concrete through the upper end opening part of gate slot between two steel sheets, and gate slot bottom sets up basic dowel, and gate slot bottom and limit wall set up the inflation stagnant water strip. The method solves the problems that the existing method is long in period, high in construction difficulty, easy to cause water leakage, and influences the construction quality of the permanent plug in the later period. Belongs to the technical field of water and electricity hydraulic engineering.

Description

Quick block structure of interim shutoff of diversion tunnel import

Technical Field

The utility model relates to a quick block structure of interim shutoff of diversion tunnel import belongs to water and electricity hydraulic engineering technical field.

Background

In the hydraulic and hydroelectric engineering, for the construction of a flexible dam, in order to ensure the safety of the construction of a main body structure of the dam, diversion flood control is often performed by combining a diversion tunnel with an upper cofferdam and a lower cofferdam, and the diversion tunnel needs to be blocked before water storage. The plugging of the diversion tunnel comprises temporary plugging at an inlet and permanent plugging at an anti-seepage plug, wherein the temporary plugging at the inlet is required before the permanent plug is constructed.

The engineering measure of the temporary plugging of the diversion tunnel inlet is that a metal gate is usually adopted for lower gate water storage, a gate well is arranged at the diversion tunnel inlet in the traditional mode, a plane sliding gate is arranged in the gate well, and at ordinary times, a gate locking ingot is arranged on an overhaul platform, and during plugging, the gate is slowly put down and closed by using a fixed winch. For projects with medium and small sizes, low lower gate water heads and slow water level rising, the temporary plugging of the diversion tunnel inlet is carried out by adopting a traditional metal gate method, the installation of embedded parts of metal structures, the water stop installation, the gate production and the hoisting are involved, different specialties are crossed, the construction period is long, and the construction cost is high due to large project amount. At present, some projects adopt the prefabricated reinforced concrete stop log door to carry out the interim shutoff of diversion tunnel import, but prefabricated reinforced concrete stop log door preparation cycle length must carry out the hoist and mount construction, and the construction degree of difficulty is big, and for convenient hoist and mount, the prefabricated stop log door need be less than the certain size of gate well, therefore after the prefabricated stop log door is laid, easily leads to leaking, influences the construction quality of permanent end cap in later stage.

SUMMERY OF THE UTILITY MODEL

The utility model provides a quick block structure of interim shutoff of diversion tunnel import to solve the cycle length that current method exists, the construction degree of difficulty is big, and easily leads to leaking, influences the construction quality scheduling problem of the permanent end cap in later stage.

For solving the above-mentioned problem, plan to adopt such a quick block structure of interim shutoff of diversion tunnel import, including setting up in the door well of diversion tunnel import department, seted up the gate slot along circumference in the door well, the caulking groove has been seted up along circumference respectively to the upstream side and the downstream side of gate slot in the door well, and the upper end of gate slot and caulking groove all link up the door well, and two steel sheets extend in the gate well and inlay in the caulking groove by the upper end of the caulking groove of last downstream side respectively, and has filled back the concrete through the upper end opening part of gate slot between two steel sheets.

In the quick plugging structure, the structural size of the gate shaft is consistent with that of the diversion tunnel,

in the rapid plugging structure, foundation dowels are also distributed and fixed in the door well between the two caulking grooves, one end of each foundation dowel is embedded and fixed in a bottom plate of the door well, and the other end of each foundation dowel extends to an inner cavity of the door well, so that the stability of concrete is improved;

among the aforesaid quick block structure, the bottom and the boundary wall of door groove still are provided with the inflation sealing rod along the circumference of door well.

Compared with the prior art, the utility model discloses the mode that can adopt the site pouring carries out the quick shutoff construction of diversion tunnel import, has cancelled production, the prevention of seepage of conventional metal gate or prefabricated stoplog door and has handled and the construction of on-the-spot hoist and mount, makes this utility model have following effect:

1) the steel plates are arranged at the upper and lower positions of the door slot, so that the door slot backfilling concrete template can be taken as the door slot backfilling concrete template, the door slot backfilling concrete forms an integral stress structure, the rigidity of the door slot backfilling concrete is enhanced, and the safety of the structure is ensured.

2) Chiseling treatment is carried out on the side wall of the door groove, combination of new and old concrete contact surfaces can be guaranteed, and meanwhile, the expansion water stop strip is arranged at the door groove, so that the anti-seepage effect of the plugging structure can be effectively guaranteed.

3) The diversion tunnel inlet plugging structure is constructed in a cast-in-place mode, processes such as template installation are omitted, the structure is simple, construction is convenient, rapid construction can be achieved, meanwhile, the engineering quantity is reduced, and the engineering investment is reduced.

Drawings

FIG. 1 is an axial cross-sectional view of the present invention;

FIG. 2 is a cross-sectional view A-A of FIG. 1;

FIG. 3 is a cross-sectional view B-B of FIG. 1;

fig. 4 is a cross-sectional view C-C of fig. 1.

Detailed Description

To further clarify the objects, technical solutions and advantages of the present invention, a more particular description of the invention will be rendered by reference to the appended drawings, which are illustrated in the appended drawings.

Examples

Referring to fig. 1 to 4, the present embodiment provides a temporary plugging fast plugging structure for diversion tunnel entrance, which includes a gate shaft 1 disposed at the entrance of the diversion tunnel for facilitating diversion flood and post plugging of the diversion tunnel, the structural size of the gate shaft 1 is the same as that of the diversion tunnel, a city gate tunnel type is mostly adopted in the engineering, and a caulking groove 4 for mounting a steel plate 2 at the post and a gate groove 5 for pouring concrete 3 are disposed on the gate shaft 1, a caulking groove 4 is respectively disposed at the upper and lower streams of the gate groove 5, a steel plate 2 is disposed in the caulking groove, the steel plate 2 can be used as a concrete 3 template for facilitating construction, and forms an integral stressed structure with backfilled concrete 3, so as to enhance the overall rigidity of the plugging structure and ensure the safety of the structure, a foundation dowel 6 is disposed at the bottom of the gate groove 5, the dowel is made of a phi 25 steel bar, L is 1.5m @0.3 × 0.3m, the exposed 1m, the rectangular arrangement is adopted, the foundation dowel 6 is disposed in, the stability of structure can be increased, the safety of structure is guaranteed.

An expansion water stop strip 7 is arranged at the bottom and the side wall of the door slot 5, and the BW-II type expansion water stop strip 7 is adopted to ensure the seepage-proofing effect of the plugging structure and avoid the influence of the seepage water of the plugging structure on the construction quality of the permanent plug.

Before concrete 3 is poured in the gate slot 5, chiseling treatment is carried out on a new concrete joint surface and an old concrete joint surface, the chiseling depth is not less than 2cm, but concrete reinforcing steel bars of the gate shaft 1 cannot be damaged so as to ensure reliable combination of the concrete 3 and original concrete of the gate shaft 1, and the concrete 3 adopts quick-setting concrete, so that the maintenance time of a plugging structure is shortened, and the engineering construction progress is accelerated.

The specific implementation sequence is as follows:

a. constructing a gate shaft 1 structure, and plugging the gate shaft 1 at the inlet of the diversion tunnel before the engineering lower brake water storage;

b. before plugging, chiseling the periphery of a new concrete joint surface and an old concrete joint surface of a concrete 3 pouring area in a door well 1;

c. arranging basic dowel bars 6 at the door slots 5 according to design;

d. a BW-II type expansion water stop strip 7 is arranged at the door slot 5 according to design;

e. installing a steel plate 2;

f. backfilling concrete 3 in the door slot 5 and pouring;

g. and (3) curing the concrete.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims

1. The utility model provides a quick block structure of interim shutoff of diversion tunnel import which characterized in that: including setting up in door well (1) of diversion tunnel import department, door slot (5) have been seted up along circumference in door well (1), caulking groove (4) have been seted up along circumference respectively to the upstream side and the downstream side of door slot (5) in door well (1), and the upper end of door slot (5) and caulking groove (4) all link up door well (1), two steel sheet (2) extend in door well (1) and inlay in caulking groove (4) by the upper end of caulking groove (4) of last downstream side respectively, and the upper end opening part through door slot (5) is backfilled with concrete (3) between two steel sheet (2).

2. The temporary plugging fast plugging structure for diversion tunnel inlet of claim 1, wherein: the structural size of the gate shaft (1) is uniform with that of the diversion tunnel.

3. The temporary plugging fast plugging structure for diversion tunnel inlet of claim 1, wherein: still distribute in the door well (1) between two caulking grooves (4) and be fixed with basic dowel steel (6), in the bottom plate that is fixed in door well (1) was inlayed to the one end of basic dowel steel (6), the other end extended the inner chamber of door well (1).

4. The temporary plugging fast plugging structure for diversion tunnel inlet of claim 1, wherein: the bottom and the side wall of the door slot (5) are also provided with an expansion water stop strip (7) along the circumferential direction of the door well (1).