CN213867697U - Arrangement structure of pressure pipeline and drainage gallery suitable for TBM construction - Google Patents
Arrangement structure of pressure pipeline and drainage gallery suitable for TBM construction Download PDFInfo
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- CN213867697U CN213867697U CN202021290224.8U CN202021290224U CN213867697U CN 213867697 U CN213867697 U CN 213867697U CN 202021290224 U CN202021290224 U CN 202021290224U CN 213867697 U CN213867697 U CN 213867697U
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Abstract
The utility model discloses a pressure pipeline and drainage gallery arrangement structure suitable for TBM construction, including the construction branch tunnel that is used for many parallel pressure pipelines middle level caves of construction, will excavate the starting point of drainage gallery on the construction branch tunnel and set up as a point, excavate by a point and form first section drainage gallery and the second section drainage gallery that connects gradually, the connection inflection point between first section drainage gallery and the second section drainage gallery sets up as b point, the tail end of second section drainage gallery sets up as c point; the tail end of the second section of drainage gallery is connected with a snake-shaped drainage gallery, the snake-shaped drainage gallery is connected with a plurality of deep drainage holes, and the tail end of the snake-shaped drainage gallery is set as a point d; the tail end of the snakelike drainage gallery is connected with the point b of the first drainage gallery through the seventh drainage gallery. The utility model discloses simple structure, the advantage lies in can rationally arranging of drainage gallery chamber to the construction characteristics of TBM machinery, arranges construction machinery's approach and transition, avoids the construction scheduling problem of being obstructed.
Description
Technical Field
The utility model belongs to the technical field of hydraulic and hydroelectric engineering, concretely relates to be suitable for pipeline under pressure and drainage corridor's arrangement structure of 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 the TBM method to carry out pipeline under pressure drainage corridor has just been mentioned in "a power station pipeline under pressure drainage corridor structure" (CN201910501349.6), and is very good example. But there are also problems from the point of view of the description.
(1) The requirement of TBM construction on a site is higher, so that the entering and leaving of a machine need to be arranged in detail in the actual engineering design. The drain gallery is referred to herein as a closed loop, but there is no description of how the TBM enters the loop for initial point excavation of the drain gallery, and how it leaves the drain gallery after the closed loop drain gallery has been excavated.
(2) The drainage corridor described therein is located in the middle of the level in each two pressure pipes, at a level close to that of the level in the high-pressure pipes, and this design is the design solution adopted by most power stations. The design scheme can destroy rock mass between the level tunnels in every two pressure pipelines, influence the combined stress of surrounding rock and the steel plate, increase the thickness of the steel plate and improve investment; meanwhile, the horizontal holes, the drainage galleries and the construction branch holes in the pressure pipelines are arranged in the adjacent areas at the same elevation in a longitudinal and transverse mode, so that the difficulty in arranging drainage ditches at the bottoms of the drainage galleries is increased.
(3) As depicted in fig. 3, the deep drain holes are formed on only one side of the pressure pipes on both sides above the cavern, unlike the deep drain holes formed on both sides of the cavern in the middle pressure pipe, which is also the design scheme adopted by most power stations. In the design, only one side above the flat hole in the pressure pipelines at two sides is provided with the deep drainage hole, so that a closed drainage area is difficult to form, and the effect of reducing external water is weakened.
The difficulty of adopting TBM to construct the drainage gallery is as follows: how to reasonably arrange the route of the drainage gallery can ensure the effective construction of the TBM and ensure the rapid and safe excavation of the drainage gallery; but also can generate better drainage effect on rock mass around the flat hole in the pressure pipeline and reduce the underground water level in time; and simultaneously, the integrity of rock mass between the flat holes in the pressure pipeline is protected as much as possible. The prior art efforts have still suffered from a number of deficiencies to address the above problems.
Based on the circumstances, the utility model provides a be suitable for pipeline under pressure and drainage corridor's arrangement structure of TBM construction can effectively solve above problem.
SUMMERY OF THE UTILITY MODEL
To the not enough of existence among the prior art, the utility model aims to provide a be suitable for pipeline under pressure and drainage corridor's arrangement structure of TBM construction. The utility model discloses simple structure, drainage gallery circuit and slope reasonable in design thereof, three birds with one stone, the advantage lies in can rationally arranging of drainage gallery chamber to the construction characteristics of TBM machinery, arranges construction machinery's approach and transition, avoids the construction scheduling problem that is obstructed. Meanwhile, the elevation of the drainage gallery is improved, the damage to the middle rock mass at the same elevation of the horizontal tunnel in the pressure pipeline is reduced, the integrity of surrounding rocks in the area is improved, the sharing ratio of the surrounding rocks to the internal water pressure is increased, and the investment is reduced. The outside of the adit in the pressure pipeline of both sides respectively increases a set of drainage corridor for 2 drainage corridors all have in each pressure pipeline adit top, beat dark wash port from the drainage corridor, the adit all can form confined drainage interval in every pressure pipeline like this, can more effectual reduction groundwater, reduces the steel sheet wall thickness and increases and adds into the interannular distance, reduces the engineering investment and the construction degree of difficulty.
In order to solve the technical problem, the utility model discloses a following technical scheme realizes:
an arrangement structure of a pressure pipeline and a drainage gallery suitable for TBM construction comprises a construction branch hole for constructing a plurality of horizontal holes in parallel pressure pipelines; setting the starting point of the drainage gallery excavated on the construction branch tunnel as a point a, excavating and forming a first section of drainage gallery and a second section of drainage gallery which are sequentially connected from the point a, setting the connection inflection point between the first section of drainage gallery and the second section of drainage gallery as a point b, and setting the tail end of the second section of drainage gallery as a point c; from point a to point c through point b, the elevation of the interval is raised;
the tail end of the second section of drainage gallery is connected with a snake-shaped drainage gallery arranged above a horizontal hole in the pressure pipeline, the snake-shaped drainage gallery is connected with a plurality of deep drainage holes, and the tail end of the snake-shaped drainage gallery is set as a point d; from point c to point d, the elevation of the interval is reduced;
the tail end of the snakelike drainage gallery is connected with a point b of the first drainage gallery through a seventh drainage gallery, and an inflection point on the seventh drainage gallery, which is close to the point b, is set as a point e; the elevation of the interval is reduced from the point d to the point a through the points e and b.
As an optimal technical scheme of the utility model, snakelike drainage corridor is including the third section drainage corridor, first section plane bend, fourth section drainage corridor, second section plane bend, fifth section drainage corridor, third section plane bend and the sixth section drainage corridor that connect gradually, and the head end and the c point of third section drainage corridor are connected, and the tail end and the d point of sixth section drainage corridor are connected.
As an optimized technical scheme of the utility model, by the drainage corridor in this interval of c point to d point, adopt snakelike lines on the planar arrangement, the slope is than being 0.5%.
As the utility model discloses an optimized technical scheme, by the drainage corridor in this interval of c point to d point, the top elevation height of the flat hole in its bottom excavation elevation ratio pressure pipeline is 25 ~ 30 m.
As an optimized technical scheme of the utility model, the slope of first section drainage corridor and second section drainage corridor is not more than 10%.
As an optimal technical scheme of the utility model, the drainage corridor adopts the mode formation of TBM excavation construction, and its section is circular, and the diameter is 3.5m, and the turning radius of turning department needs to satisfy the requirement that TBM marched.
As the utility model discloses a preferred technical scheme, the adit includes three penstock mesochims of parallel arrangement among the penstock, and the upper left and right oblique side of adit respectively corresponds in every penstock is equipped with a drainage corridor.
As an optimal technical scheme of the utility model, deep drainage hole respectively with the inside intercommunication of third section drainage corridor, fourth section drainage corridor, fifth section drainage corridor and sixth section drainage corridor.
As an optimal technical scheme of the utility model, dark wash port passes through the PVC pipe and sets up the soft formula of snakelike drainage corridor and does not permeate water the union coupling, and the soft formula does not permeate water the pipe and leads water to in the escape canal of snakelike drainage corridor bottom.
Compared with the prior art, the utility model, following advantage and beneficial effect have:
the utility model discloses simple structure, drainage corridor circuit and slope reasonable in design thereof, three birds with one stone, specifically can the aggregate do:
firstly, the method comprises the following steps: the drainage gallery line and the spatial relation between the drainage gallery line and the horizontal segment construction branch tunnel in the pressure pipeline and the horizontal tunnel in the pressure pipeline are reasonably arranged, so that the advancing mode of the TBM machine is simple and clear, and the advantages of high construction efficiency, high excavation speed, safe construction process and the like brought by the adoption of the TBM can be better exerted.
Secondly, the method comprises the following steps: the integrity of rock masses at the same height between the horizontal tunnels in the pressure pipeline can be ensured, the running safety of the horizontal tunnels in the pressure pipeline is improved, the wall thickness of the steel plate is reduced to a certain extent, and the investment is saved.
Thirdly, the method comprises the following steps: the left upper part and the right upper part of the adit in each pressure pipeline are respectively provided with a drainage gallery, and deep drainage holes are drilled in the drainage galleries, so that the adit in each pressure pipeline can form a closed drainage interval, the underground water level can be effectively reduced, the wall thickness of a steel plate is reduced, the distance between the feeding rings is increased, 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 structural view of the longitudinal section of the present invention (section A-A);
fig. 3 is a typical cross-sectional view of the drainage gallery of the present invention.
Detailed Description
In order to make the technical solution of the present invention better understood by those skilled in the art, the following description of the preferred embodiments of the present invention is given with reference to the accompanying examples, but it should be understood that the drawings are for illustrative purposes only and are not to 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.
As shown in figure 1, the arrangement structure of the pressure pipeline and the drainage gallery suitable for TBM construction comprises a construction branch hole 1 for constructing a plurality of parallel pressure pipeline middle flat holes 2, wherein the pressure pipeline middle flat holes 2 penetrate through the construction branch hole 1 and are vertical to the construction branch hole 1; setting the starting point of the drainage gallery excavated on the construction branch tunnel 1 as a point a, excavating and forming a first section of drainage gallery 3 and a second section of drainage gallery 4 which are sequentially connected from the point a, setting the connection inflection point between the first section of drainage gallery 3 and the second section of drainage gallery 4 as a point b, and setting the tail end of the second section of drainage gallery 4 as a point c; the elevation of the interval is increased from the point a to the point c through the point b.
Specifically, the gradient of the first section of the drainage gallery 3 and the second section of the drainage gallery 4 is not more than 10%; the drainage gallery is formed by adopting a TBM excavation construction mode, the section of the drainage gallery is circular, the diameter of the drainage gallery is 3.5m, and the turning radius of a turning part needs to meet the requirement of TBM advancing.
The tail end of the second section of the drainage gallery 4 is connected with a snake-shaped drainage gallery, and the tail end of the snake-shaped drainage gallery is set as a point d; the snakelike drain gallery comprises a third section of drain gallery 51, a first section of plane bend 61, a fourth section of drain gallery 52, a second section of plane bend 62, a fifth section of drain gallery 53, a third section of plane bend 63 and a sixth section of drain gallery 54 which are sequentially connected, wherein the head end of the third section of drain gallery 51 is connected with the point c, and the tail end of the sixth section of drain gallery 54 is connected with the point d.
Specifically, from point c to point d, the elevation of the interval is reduced; the drainage gallery in the interval from the point c to the point d adopts a serpentine line on the plane arrangement, and the slope ratio is 0.5 percent. The elevation of the bottom plate at the point c is higher than the certain height of the flat hole 2 in the pressure pipeline. Through comprehensive analysis, if the height difference is too small, the integrity of surrounding rocks between the flat holes 2 in the pressure pipeline can still be influenced by the drainage gallery excavation; if the height difference is too large, the rock mass in the range of the height difference between the drainage gallery and the adit in the pressure pipeline is a drainage vacuum zone, and no effective drainage measure is provided, so that the external water pressure of the steel plate can be increased. And positioning the height difference by 25-30 m through numerical calculation and multi-target decision.
Specifically, the pressure pipeline middle adit 2 comprises three pressure pipeline middle adits 2 which are arranged in parallel, and a drainage gallery is correspondingly arranged above the left inclined hole and the right inclined hole of each pressure pipeline middle adit 2, so that rock bodies between the pressure pipelines middle adits 2 are intact. The snakelike drain gallery is provided with deep drain holes 8 which are respectively communicated with the interiors of the third section of drain gallery 51, the fourth section of drain gallery 52, the fifth section of drain gallery 53 and the sixth section of drain gallery 54; as shown in FIG. 2, a drain hole 8 with a depth of 30-40 m is drilled from a range of 100-120 degrees of a central angle of a top arch of the drain gallery, and the row spacing is 5 m; the pilot tunnel 2 in each pressure channel is located under a closed drainage curtain consisting of a drainage gallery and a deep drainage hole 8.
As shown in fig. 3, the deep drain hole 8 is connected to a soft watertight pipe 10 provided in the serpentine drain gallery through a PVC pipe 9, and the soft watertight pipe 10 guides water to a drain 11 at the bottom of the serpentine drain gallery. The groundwater flows into a drainage ditch 11 under the bottom plate after passing through a deep drainage hole 8, a PVC pipe 9 and a soft impermeable pipe 10 of the drainage gallery. The groundwater collected in the drainage corridor flows from point c through points d, e, b and a and finally into the construction branch hole 1, thus flowing out of the mountain.
The tail end of the sixth drainage gallery 54 is connected with the point b of the first drainage gallery 3 through a seventh drainage gallery 7, and the inflection point on the seventh drainage gallery 7 close to the point b is set as a point e; the elevation of the interval is reduced from the point d to the point a through the points e and b.
The utility model provides a be suitable for pipeline under pressure and drainage corridor's arrangement structure's of TBM construction method, including following construction steps:
s1, taking a certain area before a point a of a construction branch tunnel 1 as an assembly site of a TBM, and installing and debugging the TBM;
s2, after the TBM is debugged and well operated, constructing a first section of drainage gallery 3 and a second section of drainage gallery 4 from a point a, wherein the two sections of drainage galleries are in a climbing mode, the gradient is not more than 10%, and finally the bottom excavation elevation of the two sections of drainage galleries needs to be 25-30 m higher than the top elevation of the flat hole 2 in the pressure pipeline when the two sections of drainage galleries reach a point c.
S3, excavating construction is sequentially carried out on a third section of drainage gallery 51, a first section of plane bend 61, a fourth section of drainage gallery 52, a second section of plane bend 62, a fifth section of drainage gallery 53, a third section of plane bend 63 and a sixth section of drainage gallery 54, excavating is carried out from a point c to a point d, a descending mode is adopted, and the gradient is 0.5%;
s4, constructing the seventh drainage gallery 7 from the point d to the point b through the point e, and determining the concrete gradient according to field actual measurement in a slope descending mode;
and S5, after the construction of the seventh drainage gallery 7 is finished, the construction machinery is finally transported out of the underground chamber group through the first drainage gallery 3 which is formed by excavation and the construction branch hole 1.
According to the utility model discloses a description and attached drawing, the field technical staff makes or uses very easily the utility model discloses a be suitable for pipeline under pressure and drainage corridor's of TBM construction arrangement structure to can produce the positive effect that the utility model discloses record.
Unless otherwise specified, in the present invention, if the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings, it is only for the 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 used 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.
Unless expressly stated or limited otherwise, the terms "disposed," "connected," and "connected" are used broadly and encompass both fixed and removable connections, or integral connections; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The above is only the preferred embodiment of the present invention, not to the limitation of the present invention in any form, all the technical matters of the present invention all fall into the protection scope of the present invention to any simple modification and equivalent change of the above embodiments.
Claims (9)
1. An arrangement structure of a pressure pipeline and a drainage corridor suitable for TBM construction is characterized in that: the construction method comprises the following steps of constructing a branch hole (1) of a horizontal hole (2) in a plurality of parallel pressure pipelines, setting the starting point of excavating a drainage gallery on the branch hole (1) as a point a, excavating the point a to form a first section of drainage gallery (3) and a second section of drainage gallery (4) which are sequentially connected, setting the connection inflection point between the first section of drainage gallery (3) and the second section of drainage gallery (4) as a point b, and setting the tail end of the second section of drainage gallery (4) as a point c; from point a to point c through point b, the elevation of the interval is raised;
the tail end of the second section of the drainage gallery (4) is connected with a snake-shaped drainage gallery arranged above the horizontal hole (2) in the pressure pipeline, the snake-shaped drainage gallery is connected with a plurality of deep drainage holes (8), and the tail end of the snake-shaped drainage gallery is set as a point d; from point c to point d, the elevation of the interval is reduced;
the tail end of the snakelike drainage gallery is connected with a point b of the first drainage gallery (3) through a seventh drainage gallery (7), and an inflection point, close to the point b, on the seventh drainage gallery (7) is set as a point e; the elevation of the interval is reduced from the point d to the point a through the points e and b.
2. The arrangement of pressure pipes and drainage galleries suitable for TBM construction according to claim 1, characterized in that: the snakelike drain gallery comprises a third section of drain gallery (51), a first section of plane bend (61), a fourth section of drain gallery (52), a second section of plane bend (62), a fifth section of drain gallery (53), a third section of plane bend (63) and a sixth section of drain gallery (54) which are sequentially connected, wherein the head end of the third section of drain gallery (51) is connected with the point c, and the tail end of the sixth section of drain gallery (54) is connected with the point d.
3. The arrangement of pressure pipes and drainage galleries suitable for TBM construction according to claim 2, wherein: the drainage gallery in the interval from the point c to the point d adopts a serpentine line on the plane arrangement, and the slope ratio is 0.5 percent.
4. The arrangement of pressure pipes and drainage galleries suitable for TBM construction according to claim 1, characterized in that: and c, excavating the drainage gallery in the interval from the point c to the point d, wherein the bottom of the drainage gallery is 25-30 m higher than the top of the horizontal tunnel (2) in the pressure pipeline in elevation.
5. The arrangement of pressure pipes and drainage galleries suitable for TBM construction according to claim 1, characterized in that: the gradient of the first section of the drainage gallery (3) and the second section of the drainage gallery (4) is not more than 10%.
6. The arrangement of pressure pipes and drainage galleries suitable for TBM construction according to claim 1, characterized in that: the drainage gallery is formed by adopting a TBM excavation construction mode, the section of the drainage gallery is circular, the diameter of the drainage gallery is 3.5m, and the turning radius of a turning part needs to meet the requirement of TBM advancing.
7. The arrangement of pressure pipes and drainage galleries suitable for TBM construction according to claim 1, characterized in that: the pressure pipeline middle adit (2) comprises three pressure pipeline middle adits which are arranged in parallel, and a drainage gallery is correspondingly arranged above the left inclined part and the right inclined part of each pressure pipeline middle adit (2), so that the pressure pipeline middle adit (2) can be sealed to form a drainage curtain.
8. The arrangement of pressure pipes and drainage galleries suitable for TBM construction according to claim 2, wherein: the deep drain hole (8) is respectively communicated with the interiors of the third section of drain gallery (51), the fourth section of drain gallery (52), the fifth section of drain gallery (53) and the sixth section of drain gallery (54).
9. The arrangement of pressure pipes and drainage galleries suitable for TBM construction according to claim 8, wherein: deep drainage hole (8) are connected with soft type watertight pipe (10) arranged in snakelike drainage gallery through PVC pipe (9), soft type watertight pipe (10) leads water to drainage ditch (11) at snakelike drainage gallery bottom, and bottom drainage ditch (11) are located bottom plate center 2 side.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112195883A (en) * | 2020-07-02 | 2021-01-08 | 中国电建集团华东勘测设计研究院有限公司 | Arrangement structure and construction method of pressure pipeline and drainage gallery suitable for TBM construction |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112195883A (en) * | 2020-07-02 | 2021-01-08 | 中国电建集团华东勘测设计研究院有限公司 | Arrangement structure and construction method of pressure pipeline and drainage gallery suitable for TBM construction |
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