CN215715116U

CN215715116U - Arrangement structure suitable for horizontal tunnel and drainage gallery in pressure pipeline for TBM construction

Info

Publication number: CN215715116U
Application number: CN202120467558.6U
Authority: CN
Inventors: 吴都; 李高会; 杨飞; 王东锋; 赵瑞存; 姚敏杰; 袁翔; 章梦捷
Original assignee: PowerChina Huadong Engineering Corp Ltd
Current assignee: PowerChina Huadong Engineering Corp Ltd
Priority date: 2021-03-04
Filing date: 2021-03-04
Publication date: 2022-02-01
Anticipated expiration: 2031-03-04

Abstract

The utility model discloses an arrangement structure of a adit and a drainage gallery in a pressure pipeline suitable for TBM construction, and belongs to the field of hydraulic and hydroelectric engineering. The structure comprises a construction branch hole for constructing the flat hole in at least two parallel pressure pipelines, wherein an assembly field for assembling TBM machinery and a disassembly field for disassembling TBM machinery are respectively built at the left side and the right side of the construction branch hole on one side of the flat hole in the pressure pipeline, the assembly field is connected with the excavation end of a first section of drainage gallery, the tail end of the first section of drainage gallery is connected with the excavation end of a second section of drainage gallery, the tail end of the second section of drainage gallery is connected with the disassembly field, and the connection point of the first section of drainage gallery and the second section of drainage gallery is positioned at the other side of the flat hole in the pressure pipeline. The utility model has simple structure, and the drainage gallery reasonably arranges the hole axes under the precondition of fully utilizing the construction branch holes, thereby obtaining good effect.

Description

Arrangement structure suitable for horizontal tunnel and drainage gallery in pressure pipeline for TBM construction

Technical Field

The utility model relates to the field of hydraulic and hydroelectric engineering, in particular to an arrangement structure of a adit and a drainage gallery in a pressure pipeline suitable for TBM construction.

Background

The pressure pipeline of the hydropower station is generally designed by adopting a steel plate lining, and the steel plate lining has the advantages of high strength, good internal water bearing condition, good seepage resistance and the like, but also has the fatal defect of resisting external water pressure difference. In response to this weakness, a drain gallery is provided around the high pressure pipe with the aim of lowering the ground water level in the vicinity of the high pressure pipe. The excavation section of the drainage gallery is generally very small, the construction difficulty is very large by using a drilling and blasting method, and the safety and the construction progress are difficult to guarantee. Therefore, in recent years, a few power stations introduce a relatively advanced TBM method to carry out construction of the drainage gallery, so that two problems of safety and progress are solved to a great extent. For example, the utility model discloses a construction that adopts TBM to carry out the gallery of the pressure pipe middle level tunnel drainage gallery has been mentioned in utility model patent a power station pressure pipeline drainage gallery structure (CN 201910501349.6), but can see from the article that the design of this patent all has certain limitation.

(1) Firstly, the patent mainly aims at that the horizontal hole in the pressure pipeline is 3 tunnels arranged in parallel, a drainage gallery is respectively arranged in the middle of each 2 tunnels, and finally a closed loop is formed. However, in many practical projects, only the holes in 2 pressure pipelines are provided, and as the TBM construction machinery is limited by the turning radius (the turning radius of the TBM small-section tunneling tunnel is more than or equal to 30m), the arrangement of drainage galleries among the holes in 2 pressure pipelines is still infeasible according to the method.

If the related arrangement is carried out according to the scheme, the distance between the 2 middle holes is increased so as to meet the requirement of turning radius of the TBM construction machine. This presents 2 direct problems:

1) the distance between 2 single water inlets/outlets of the water inlet/outlet of the upper reservoir is increased, so that the excavation scale of the water inlet/outlet area of the upper reservoir is increased, and the investment is increased;

2) the center distance of the unit is enlarged, the scale of an underground workshop is increased, and the excavation difficulty and investment are further increased.

(2) The TBM machine has a large volume and high space requirement on a construction site, but the patent does not describe how the TBM machine enters a site for construction and leaves the drainage gallery after the annular drainage gallery is closed to be excavated.

(3) As depicted in fig. 3, there are deep drainage holes on only one side above the cavern in the pressure conduits on both sides, unlike deep drainage holes on both sides above the cavern in the pressure conduit in the middle. In the design, only one side of the flat hole in the pressure pipelines at two sides is provided with the drainage hole, so that a closed drainage area is difficult to form, and the effect of reducing the external water is weakened.

The utility model aims at the following difficulties: aiming at the design scheme that the water delivery line is a 2-hole 4-machine, the route of the drainage gallery is reasonably arranged, so that the effective construction of the drainage gallery by the TBM machine can be ensured; and the horizontal holes in the 2 pressure pipelines are uniformly positioned below the closed drain holes, so that the effect of draining external water is greatly enhanced.

Based on the conception, the utility model provides an arrangement structure of a adit and a drainage gallery in a steel plate lining pressure pipeline, which is suitable for TBM construction.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model aims to provide an arrangement structure of a adit and a drainage gallery in a pressure pipeline, which is suitable for TBM construction. The drainage gallery is simple in structure, well achieves good effect by reasonably arranging the shaft line of the hole under the precondition of fully utilizing the construction branch hole, and comprises the following specific steps: (1) on the premise of not increasing the water inlet/outlet of an upper reservoir and the excavation scale of an underground factory building, the major technical problems that the distance between 2 medium level holes is small and the TBM machine is difficult to turn when the water delivery line is a 2-hole 4-machine mode are successfully solved. (2) On the premise of not particularly excavating the underground chambers, the space of the middle adit construction branch tunnel is fully utilized, and the entry and transition of the TBM machine are reasonably arranged, so that the investment is saved, the integrity of the underground chambers is guaranteed to the greatest extent, and unnecessary excavation is reduced. (3) The drainage gallery is positioned at the left side and the right side 2 of the flat hole in the 2 pressure pipelines, and deep drainage holes are drilled from the drainage gallery, so that the flat hole in each pressure pipeline can form a closed drainage interval, and the underground water can be effectively reduced.

In order to solve the technical problems, the utility model is realized by the following technical scheme:

the utility model provides an arrangement structure of a adit and a drainage gallery in a pressure pipeline suitable for TBM construction, which comprises a construction branch tunnel used for constructing the adit in at least two parallel pressure pipelines, wherein an assembly field for TBM mechanical assembly and a disassembly field for TBM mechanical disassembly are respectively built on the left side and the right side of the construction branch tunnel on one side far away from the adit in the pressure pipeline, the assembly field is connected with the excavation end of a first section of the drainage gallery, the tail end of the first section of the drainage gallery is connected with the excavation end of a second section of the drainage gallery, the tail end of the second section of the drainage gallery is connected with the disassembly field, and the connection point of the first section of the drainage gallery and the second section of the drainage gallery is positioned on the other side far away from the adit in the pressure pipeline.

As a preferred technical scheme of the utility model, the first section of the drainage gallery comprises a first drainage gallery connecting section, a first drainage gallery turning section, a first drainage gallery horizontal section, a second drainage gallery turning section, a first drainage gallery vertical section, a third drainage gallery turning section and a second drainage gallery horizontal section which are formed by excavation at an assembly field and are connected in sequence.

As a preferred technical scheme of the utility model, the first section of the drainage gallery is formed by climbing and excavating according to a certain gradient in the whole process.

As a preferred technical scheme of the utility model, the second section of the drainage gallery comprises a third drainage gallery horizontal section, a fourth drainage gallery turning section, a second drainage gallery vertical section, a fifth drainage gallery turning section, a fourth drainage gallery horizontal section, a sixth drainage gallery turning section and a second drainage gallery connecting section which are sequentially connected and formed by excavating the tail end of the first section of the drainage gallery.

As a preferred technical scheme of the utility model, the second section of the drainage gallery is formed by slope descending and excavation in the whole process according to a certain gradient.

As a preferable aspect of the present invention, the first drain gallery vertical section is located on a downstream side of an end of the cavern in the pressure pipe, and the second drain gallery vertical section is located on an upstream side of a beginning of the cavern in the pressure pipe.

As a preferred technical scheme of the utility model, the horizontal sections of the first, second, third and fourth drainage galleries are positioned at two sides of the outer part of the flat hole in the pressure pipeline, the elevation is approximately as high as the flat hole in the pressure pipeline, the rock mass in the middle area of the flat hole in the two adjacent pressure pipelines is not damaged by TBM tunneling, and the surrounding rock is complete.

As a preferred technical scheme of the utility model, the horizontal sections of the first, second, third and fourth drainage galleries are constructed with drainage holes along certain angles towards the middle area, so that the horizontal hole in the pressure pipeline is positioned below a closed drainage space formed by the drainage holes.

Compared with the prior art, the utility model has the following advantages and beneficial effects:

the utility model has simple structure, reasonable design of the drainage gallery line and the gradient thereof, two purposes, and can be summarized as follows:

firstly, the method comprises the following steps: on the premise of not increasing the water inlet/outlet of an upper reservoir and the excavation scale of an underground factory building, the major technical problems that the distance between 2 middle level holes is small and the TBM machinery is difficult to turn when the water delivery line is a 2-hole 4-machine are successfully solved, so that the TBM excavation becomes possible, and the construction progress and the safety are ensured.

Secondly, the method comprises the following steps: the 2 flat holes in the high-pressure pipelines are located below the closed drain holes, so that the flat holes in each high-pressure pipeline can form a closed drainage interval, the effect of leading out external water is greatly enhanced, the wall thickness of a steel plate is reduced, the feeding distance between rings is reduced, and the engineering investment and the construction difficulty are further reduced.

Drawings

FIG. 1 is a schematic plan view of the present invention;

FIG. 2 is a schematic longitudinal sectional view (section A-A) of the present invention.

Detailed Description

In order that those skilled in the art will better understand the technical solutions of the present invention, the following description of the preferred embodiments of the present invention is provided in conjunction with specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the patent; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the present patent.

The utility model will be further described with reference to the following figures 1 and 2 and examples, but without limiting the utility model thereto.

As shown in fig. 1, in the present embodiment, an arrangement structure of a adit and a drainage gallery in a steel plate lining pressure pipe suitable for TBM construction is provided, in which an assembly yard 2 and a disassembly yard 6 are respectively built on left and right sides of a construction branch tunnel 1 far from one side of a adit 7 in a pressure pipe by using an original construction branch tunnel 1. And (3) excavating from the point a of the assembly field 2 to a point b to a point c by adopting a TBM (tunnel boring machine), so as to form a first section of drainage gallery and a second section of drainage gallery, wherein a connection point (point b) of the first section of drainage gallery and the second section of drainage gallery is positioned at the other side far away from the plain tunnel 7 in the pressure pipeline, and finally, an annular closed drainage gallery is formed.

Related components of the TBM machine can be assembled in the assembly field 2, and the section size and the length of the related components need to meet the requirements of assembling of the TBM machine; the assembled TBM machine needs to be disassembled in a disassembling field 6 and transported out of a construction branch tunnel, and the section size and the length of the assembled TBM machine need to meet the requirements of the TBM machine for disassembly.

Specifically, the TBM machine starts from a point a and reaches a point b along a first drainage gallery connecting section 3-1, a first drainage gallery turning section 4-1, a first drainage gallery horizontal section 5-1, a second drainage gallery turning section 4-2, a first drainage gallery vertical section 6-1, a third drainage gallery turning section 4-3 and a second drainage gallery horizontal section 5-2, and the TBM climbs the slope in the whole process according to the gradient of 5%.

Specifically, the TBM machine starts from a point b and reaches a point c along a third drainage gallery horizontal section 5-3, a fourth drainage gallery turning section 4-4, a second drainage gallery vertical section 6-2, a fifth drainage gallery turning section 4-5, a fourth drainage gallery horizontal section 5-4, a sixth drainage gallery turning section 4-6 and a second drainage gallery connecting section 3-2, and the TBM is constructed in a descending slope manner in the whole process.

Specifically, the horizontal sections of the first, second, third and fourth drainage galleries are located on two sides of the outer portion of the horizontal tunnel 7 in the pressure pipeline, rock bodies in the middle area of the horizontal tunnel 7 in the two pressure pipelines are not damaged by TBM tunneling, and surrounding rocks are complete.

Specifically, the first drain gallery vertical section 6-1 is located on the downstream side of the end of the cavern 7 in the pressure pipe, and the second drain gallery vertical section 6-2 is located on the upstream side of the beginning of the cavern 7 in the pressure pipe.

As shown in figure 2, the construction of the drain holes 8 is carried out from the horizontal sections of the first, second, third and fourth drain galleries to the middle area along a certain angle, so that the flat holes 7 in the 2 pressure pipelines are all positioned below the closed drain space formed by the drain holes 8.

Specifically, the cross section of the drainage gallery is a circle with the diameter of 3.5 m.

Based on the structure, the utility model provides a construction method of an arrangement structure of a adit and a drainage gallery in a steel plate lining pressure pipeline, which is suitable for TBM construction, and comprises the following construction steps:

s1, carrying out drilling and blasting excavation on the assembly field 2 in a proper area of the excavated construction branch tunnel 1, wherein the space of the assembly field 2 must meet the requirement of mechanical assembly of the TBM; selecting a proper area to carry out drilling and blasting excavation of the disassembly field 6, wherein the space of the disassembly field 6 must meet the requirement of TBM mechanical disassembly;

s2, adopting a TBM machine to perform climbing excavation along a first drainage gallery connecting section 3-1, a first drainage gallery turning section 4-1, a first drainage gallery horizontal section 5-1, a second drainage gallery turning section 4-2, a first drainage gallery vertical section 6-1, a third drainage gallery turning section 4-3 and a second drainage gallery horizontal section 5-2 in sequence according to a certain gradient in the whole process to form a first section of drainage gallery;

s3, adopting a TBM machine to continuously descend and excavate along a third drainage gallery horizontal section 5-3, a fourth drainage gallery turning section 4-4, a second drainage gallery vertical section 6-2, a fifth drainage gallery turning section 4-5, a fourth drainage gallery horizontal section 5-4, a sixth drainage gallery turning section 4-6 and a second drainage gallery connecting section 3-2 according to a certain gradient in the whole process to form a second section of drainage gallery, and finally forming an annular closed drainage gallery;

s4, constructing the drain holes 8 along the horizontal sections of the first, second, third and fourth drain galleries to the middle area along a certain angle, so that the horizontal holes 7 in the 2 pressure pipelines are all positioned below the closed drain space formed by the drain holes 8;

s5, the TBM machine disassembles the related components in the disassembly field 6, and finally, the components are transported out of the underground chamber along the adit construction branch tunnel 1.

According to the description and the drawings, the arrangement structure of the adit and the drainage gallery in the pressure pipeline suitable for TBM construction can be easily manufactured or used by the technical personnel in the field, and the positive effects recorded by the utility model can be generated.

Unless otherwise specified, in the present invention, if there is an orientation or positional relationship indicated by terms of "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, rather than to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, therefore, the terms describing orientation or positional relationship in the present invention are for illustrative purposes only, and should not be construed as limiting the present patent, specific meanings of the above terms can be understood by those of ordinary skill in the art in light of the specific circumstances in conjunction with the accompanying drawings. Furthermore, the terms "first," "second," "third," "fourth," "fifth," "sixth," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass, for example, being fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications and equivalent variations of the above embodiments according to the technical spirit of the present invention are included in the scope of the present invention.

Claims

1. Be suitable for arrangement structure of adit and drainage corridor in pressure pipeline of TBM construction, its characterized in that: including being arranged in constructing construction branch hole (1) of adit (7) in two at least parallel pressure pipelines, the left and right sides of construction branch hole (1) of adit (7) one side is being kept away from the pressure pipeline is built respectively and is supplied assembly field (2) of TBM mechanical assembly and supply dismantlement field (6) that TBM machinery was disassembled, assembly field (2) are connected with the excavation end of first section drainage corridor, the end of first section drainage corridor is connected with the excavation end of second section drainage corridor, the end and the dismantlement field (6) of second section drainage corridor are connected, and the tie point of first section drainage corridor and second section drainage corridor is located the opposite side of keeping away from adit (7) in the pressure pipeline.

2. The arrangement of the adit and drain galleries in a pressure pipe suitable for TBM construction according to claim 1, wherein: the first section of the drainage gallery comprises a first drainage gallery connecting section (3-1), a first drainage gallery turning section (4-1), a first drainage gallery horizontal section (5-1), a second drainage gallery turning section (4-2), a first drainage gallery vertical section (6-1), a third drainage gallery turning section (4-3) and a second drainage gallery horizontal section (5-2) which are sequentially connected and formed by excavation at an assembly field (2).

3. The arrangement of the adit and drain galleries in a pressure pipe suitable for TBM construction according to claim 1 or 2, wherein: the first section of drainage gallery is formed by climbing and excavating according to a certain gradient in the whole process.

4. The arrangement of the adit and drain galleries in a pressure pipe suitable for TBM construction according to claim 1, wherein: the second section of the drainage gallery comprises a third drainage gallery horizontal section (5-3), a fourth drainage gallery turning section (4-4), a second drainage gallery vertical section (6-2), a fifth drainage gallery turning section (4-5), a fourth drainage gallery horizontal section (5-4), a sixth drainage gallery turning section (4-6) and a second drainage gallery connecting section (3-2) which are sequentially connected and formed by excavating the tail end of the first section of the drainage gallery.

5. The arrangement of the adit and drain galleries in a pressure pipe suitable for TBM construction according to claim 1 or 4, wherein: and the second section of drainage gallery is formed by slope descending and excavation in the whole course according to a certain gradient.

6. The arrangement of the adit and drain galleries in a pressure pipe suitable for TBM construction according to claim 2 or 4, wherein: the first drainage gallery vertical section (6-1) is located on the downstream side of the tail end of the horizontal hole (7) in the pressure pipeline, and the second drainage gallery vertical section (6-2) is located on the upstream side of the starting end of the horizontal hole (7) in the pressure pipeline.

7. The arrangement of the adit and drain galleries in a pressure pipe suitable for TBM construction according to claim 2 or 4, wherein: the horizontal sections of the first, second, third and fourth drainage galleries are positioned at two sides of the outer part of the pressure pipeline middle adit (7), the elevation is approximately as high as the pressure pipeline middle adit (7), the rock mass in the middle area of the two adjacent pressure pipelines middle adit (7) is not damaged by TBM tunneling, and the surrounding rock is complete.

8. The arrangement of the adit and drain galleries in a pressure pipe suitable for TBM construction according to claim 1, wherein: the horizontal sections of the first, second, third and fourth drainage galleries are constructed with the drainage holes (8) along a certain angle towards the middle area, so that the horizontal hole (7) in the pressure pipeline is positioned below a closed drainage space formed by the drainage holes (8).