CN218235142U

CN218235142U - Mine method underground tunnel stagnant water curtain

Info

Publication number: CN218235142U
Application number: CN202221511315.9U
Authority: CN
Inventors: 黄怀宁; 侯宇迪; 惠丽萍; 薛茹镜; 李名淦
Original assignee: Beijing General Municipal Engineering Design and Research Institute Co Ltd
Current assignee: Beijing General Municipal Engineering Design and Research Institute Co Ltd
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2023-01-06
Anticipated expiration: 2032-06-17

Abstract

A mine method underground tunnel waterproof curtain is a closed vertical wall type waterproof curtain 2 and comprises a two-side wall type waterproof curtain 201 and a transverse wall type waterproof curtain 202 which are connected in a closed mode; the upper pilot tunnel area is a reinforced stratum, an arch-shaped cavern is formed when the upper pilot tunnel is positioned above the underground water level, the two side wall type waterproof curtains 201 are arranged downwards by penetrating through two outer side bottom corners of the upper pilot tunnel cavern, the bottom of the waterproof curtain enters a waterproof stratum 1 to a certain depth, and the waterproof stratum 1 is a naturally-existing stratum with a low seepage coefficient below the underground water level; and a transverse wall type waterproof curtain 202 which is arranged transversely from the upper cavity in the same thickness and enters the waterproof stratum 1 by a certain depth is arranged in the same thickness direction, and is connected with the wall type waterproof curtains on the two sides into a whole to form the closed vertical wall type waterproof curtain 2. The utility model discloses the mode that whole section face slip casting was compared in stagnant water construction has reduced partly unnecessary slip casting volume.

Description

Mine method underground tunnel stagnant water curtain

Technical Field

The utility model relates to a waterproof curtain structure technical field that can be used to groundwater stagnant water among the underground tunnel engineering handles specifically is to provide a mine method underground tunnel waterproof curtain.

Background

At present, in the underground tunnel construction process by adopting a mining method, particularly under the condition of a soil stratum, the excavation operation is generally required to be carried out under a waterless state for the consideration of excavation construction safety. Therefore, when the underground tunnel cross section enters the ground water level, the ground water must be treated first. There are two main modes of precipitation and water stop for treating underground water. The precipitation is generally to pump water through setting up precipitation well, falls the tunnel excavation scope local ground water level below excavation section position. The water stopping is generally realized by forming a water stopping curtain with a certain thickness outside the excavation contour line of the tunnel, preventing underground water from entering the excavation range and performing excavation construction under the obstruction of the water stopping curtain. Precipitation is relatively wasteful of water resources and causes ground settlement risks, often being restricted in use in cities.

The former waterproof curtain is generally formed by underground continuous walls, occlusive piles, jet grouting piles, full-section grouting and the like. Common construction machinery of underground continuous walls, secant piles and jet grouting piles is tall and big, is generally used for open cut construction, and is not suitable for underground tunnel engineering with a mine method with limited space. In recent years, although the use of a specially designed miniaturized machine in a mine-method pilot hole is realized, the pilot hole is generally required to be additionally arranged outside a tunnel section for waterproof curtain construction, so that redundant excavation engineering is generated, the excavation section is widened, and the mine-method construction risk is increased. The full-section grouting is a water-stop curtain form which is more common in underground tunnel engineering of a mine method, and is carried out on a tunnel section entering underground water, so that the slurry extrudes the underground water out of an excavation area, the impermeability coefficient of a soil layer is improved, and a water-resisting layer with a certain thickness is formed outside an excavation contour line. The waterproof curtain slip casting work volume of full section slip casting form is very big, and is the effective water barrier of reality except excavation profile line border, and all the other inside slip casting body are the slip casting that does not have the stagnant water purpose, all are excavated at the excavation in-process, and the cost is higher and there is great waste.

SUMMERY OF THE UTILITY MODEL

Aiming at the problems, the waterproof curtain for the mine underground tunnel aims at solving the technical problems that the waterproof curtain grouting engineering quantity of the mine underground tunnel in a full-section grouting form is very large, the grouting body of the rest inner parts is grouting without a waterproof purpose except that an excavation contour line circle is an actual effective waterproof layer, the grouting body is excavated in the excavation process, the manufacturing cost is high, and great waste exists.

The technical scheme of the utility model as follows:

a mine method underground tunnel waterproof curtain is a closed vertical wall type waterproof curtain 2 and comprises a two-side wall type waterproof curtain 201 and a transverse wall type waterproof curtain 202 which are connected in a closed mode; the upper layer pilot tunnel area is a reinforced stratum, an arch-shaped cavern is formed when the upper layer pilot tunnel is positioned above the underground water level, the two side wall type waterproof curtains 201 are arranged downwards and penetrate through the two outer bottom corners of the upper layer pilot tunnel cavern, the bottom of the waterproof curtain enters a waterproof stratum 1 to a certain depth, and the waterproof stratum 1 is a stratum which naturally exists below the underground water level and has a low seepage coefficient; and a transverse wall type waterproof curtain 202 which is arranged transversely from the upper cavity in a direction perpendicular to the excavation direction and has the same thickness and enters the waterproof stratum 1 for a certain depth is connected with the wall type waterproof curtains on the two sides into a whole to form the closed vertical wall type waterproof curtain 2.

The mine method underground tunnel waterproof curtain is characterized in that two side wall type waterproof curtains 201 and a transverse wall type waterproof curtain 202 are grouting bodies.

The mine method underground tunnel waterproof curtain is characterized in that a plurality of transverse wall type waterproof curtains are arranged at intervals.

The mine underground tunnel waterproof curtain is characterized in that a lower-layer pilot tunnel 4 is arranged below an upper-layer pilot tunnel 3 in the area of the tunnel waterproof curtain; and constructing a tunnel structure in the upper and lower guide holes.

The utility model discloses to only the lower part section get into the mine method tunnel of groundwater, utilize its upper portion space that does not get into groundwater, through the mode of slip casting, along section excavation lateral wall outline line both sides certain limit, vertical grout downwards gets into the water barrier until making the slip casting body, forms vertical wall formula stagnant water curtain in excavation section both sides. And underground water in the tunnel is drained while a lower guide tunnel is excavated through the separation of transverse and longitudinal waterproof curtains to form a tunnel section. When reaching the stagnant water construction, compare the mode of whole section face slip casting and reduced partly unnecessary slip casting volume.

The effects of the utility model

The utility model discloses utilize its upper portion space that does not get into groundwater, through the mode of slip casting, along section excavation lateral wall outline line both sides certain limit, vertical grout downwards, until making the slip casting body get into the water barrier, form vertical wall formula stagnant water curtain in excavation section both sides. And underground water in the tunnel is drained while a lower guide tunnel is excavated through the separation of transverse and longitudinal waterproof curtains to form a tunnel section. When reaching the stagnant water construction, compare the mode of whole section face slip casting and reduced partly unnecessary slip casting volume.

Drawings

FIG. 1 is a schematic diagram of the step sequence of the step (I) cross section construction of the present invention,

FIG. 2 is a schematic view of the step sequence of the step (II) cross section construction of the present invention,

FIG. 3 is a schematic view of the step sequence of the construction of the vertical section in step (III) of the present invention,

figure 4 is a schematic view of the horizontal cross-section construction process of figure 3,

FIG. 5 is a schematic view of the step sequence of the step (III) vertical section construction of the present invention,

figure 6 is a schematic view of the horizontal cross-section construction process of figure 5,

FIG. 7 is a schematic view of the step sequence of the construction of the vertical section in step (III) of the present invention,

figure 8 is a schematic view of the horizontal cross-section construction process of figure 7,

figure 9 is a schematic view of the cross-sectional construction process of figure 7,

FIG. 10 is a schematic view of the step sequence of the step (four) cross-section construction of the present invention,

description of the figures:

the waterproof structure comprises a waterproof stratum 1, a closed vertical wall type waterproof curtain 2, two side wall type waterproof curtains 201, a transverse wall type waterproof curtain 202, an upper layer pilot tunnel 3, a No. 1 cavern 301, a No. 2 cavern 302, an upper layer preliminary support 31, an upper layer temporary intermediate wall 32, an upper layer temporary inverted arch 33, a lower layer pilot tunnel 4, a No. 3 cavern 401, a No. 4 cavern 402, a lower layer preliminary support 41, a lower layer temporary intermediate wall 42 and a permanent secondary lining 5.

Detailed Description

In order to clearly understand the technical solution of the present invention, the following detailed description is made with reference to the accompanying drawings.

Referring to fig. 2, 3 and 4, the waterproof curtain for the underground tunnel by the mining method of the present invention is a closed vertical wall type waterproof curtain 2, which comprises a closed connection two side wall type waterproof curtain 201 and a transverse wall type waterproof curtain 202; the upper pilot tunnel area is a reinforced stratum, an arch-shaped cavern is formed when the upper pilot tunnel is positioned above the underground water level, the two side wall type waterproof curtains 201 are arranged downwards by penetrating through two outer side bottom corners of the upper pilot tunnel cavern, the bottom of the waterproof curtain enters a waterproof stratum 1 to a certain depth, and the waterproof stratum 1 is a naturally-existing stratum with a low seepage coefficient below the underground water level; and a transverse wall type waterproof curtain 202 which is arranged transversely from the upper cavity in the same thickness and enters the waterproof stratum 1 by a certain depth is arranged in the same thickness direction, and is connected with the wall type waterproof curtains on the two sides into a whole to form the closed vertical wall type waterproof curtain 2.

The underground tunnel waterproof curtain adopting the mining method is characterized in that a lower-layer pilot tunnel 4 is arranged below an upper-layer pilot tunnel 3 in the area of the underground tunnel waterproof curtain; and (3) constructing a tunnel structure in the upper and lower guide holes, as shown in figures 9 and 10.

Referring to fig. 1-10, the utility model relates to a construction method of a mine method underground tunnel waterproof curtain, which comprises the following steps:

excavating and penetrating an upper-layer No. 1 cavern 301 and a No. 2 cavern 302 which are positioned at an underground water level, and synchronously constructing a primary support structure of the cavern; referring to fig. 1, the groundwater level is below the bottoms of the No. 1 cavern 301 and the No. 2 cavern 302;

after the upper-layer cavern 1 and the upper-layer cavern 2 are communicated, grouting downwards at bottom corners of two outer sides of the communicated cavern to form a grouting body which has a certain thickness and extends into the water-proof stratum 1 to a certain depth and serves as a two-side wall type water-stopping curtain 201; as shown with reference to figure 2 of the drawings,

step (III), as shown in fig. 3 and 4, a transverse grouting body is applied from the upper cavity in the direction perpendicular to the excavation direction at a certain distance from the front of the tunnel face and with the same thickness, enters the waterproof stratum 1 by a certain depth, serves as a transverse wall type waterproof curtain 202, and is closed with the wall type waterproof curtains 201 on the two sides of the previous step; referring to fig. 5 and 6, groundwater within the range of the waterproof curtain is pumped out; referring to fig. 7, 8 and 9, excavating a cavity No. 3, a cavity No. 4 and a cavity No. 3 in underground water to the front of a transverse waterproof curtain;

step (IV), repeating the construction cycle of grouting to form a transverse waterproof curtain, pumping underground water and excavating a cavern in the step (III) until the construction cycle is communicated with No. 3 and No. 4 caverns in the underground water; and (5) dismantling the primary support in sections, paving a waterproof plate, and pouring a permanent secondary lining structure. As shown with reference to figure 10 of the drawings,

the construction method of the underground tunnel waterproof curtain by the mine method comprises the following steps of (I), positioning an upper layer cavity 1 and a cavity 2 above an underground water level, reserving core soil when the cavity 1 of a pilot tunnel is excavated, staggering upper and lower steps for 3-5m when the cavity 1 of the pilot tunnel is excavated by a step method, erecting a steel grating, reinforcing arch legs by adopting foot locking anchor rods, spraying primary support concrete by using a hanging net, and timely performing first-stage support construction and back grouting on the upper layer; after the No. 1 cavern is communicated, excavating a No. 2 cavern 302 of an upper guide tunnel parallel to the No. 1 cavern by the same method, and applying an upper primary support II and back grouting until the No. 2 cavern is communicated; an upper temporary intermediate wall 32 is arranged between the No. 1 cavern and the No. 2 cavern; constructing an upper temporary inverted arch 33 at the bottom of the upper pilot tunnel; see fig. 1.

The mine method underground tunnel waterproof curtain construction method comprises the following steps that an upper primary support I and an upper primary support II form an upper primary support 31.

The underground tunnel waterproof curtain construction method by the mine method is characterized in that in the step (III), the transverse wall type waterproof curtain 202 and the two side wall type waterproof curtains 201 are closed to form a closed vertical wall type waterproof curtain 2, and then underground water in the range of the closed vertical wall type waterproof curtain is pumped out; in the closed vertical wall type waterproof curtain 2, a No. 3 grotto 401 is excavated firstly, core soil is reserved, upper and lower steps are staggered by 3-5m when the step method is adopted for excavation, a steel grating is erected, a locking anchor rod is adopted for reinforcing arch feet, primary support concrete is sprayed on a hanging net, and the third primary support and the back grouting of a lower layer of construction are carried out in time; when the No. 3 cavern advances 5-7m, excavating the No. 4 cavern 402 parallel to the No. 3 cavern, and applying the lower-layer primary support four and back grouting until the No. 3 cavern and the No. 4 cavern are excavated to the front of the transverse waterproof curtain 202; a lower temporary intermediate wall 42 is arranged between the No. 3 cavern and the No. 4 cavern; see fig. 8.

The underground tunnel waterproof curtain construction method adopting the mining method is characterized in that the step (IV) of grouting to form a transverse waterproof curtain, pumping underground water and excavating a cavern is a construction step of repeating the step (III) for multiple times.

The construction method of the underground tunnel waterproof curtain by the mining method comprises the following steps that (IV), after a primary support tunnel chamber is communicated, the bottom of a lower temporary middle partition wall is cut off by a section of 5-7m, a tunnel inverted arch waterproof layer is constructed on a lower temporary inverted arch, an inverted arch secondary lining is poured, and a steel bar and waterproof plate joint is reserved; and cutting off a section of 5-7m, removing the residual upper and lower temporary middle bulkheads and upper temporary inverted arches, constructing an arch part and a side wall waterproof layer, pouring a secondary lining structure, sealing to form a ring, and timely performing secondary lining back grouting, wherein the step is shown in figure 10.

Claims

1. A mine method underground tunnel waterproof curtain is characterized in that the waterproof curtain is a closed vertical wall type waterproof curtain (2) and comprises two side wall type waterproof curtains (201) and a transverse wall type waterproof curtain (202) which are connected in a closed mode; the upper layer pilot tunnel area is a reinforced stratum, an arch-shaped cavern is formed when the upper layer pilot tunnel is positioned above the underground water level, the two side wall type waterproof curtains (201) are arranged downwards and penetrate through the bottom corners of the two outer sides of the upper layer pilot tunnel cavern, the bottom of the upper layer pilot tunnel cavern enters a water-proof stratum (1) to a certain depth, and the water-proof stratum (1) is a stratum which naturally exists below the underground water level and has a low seepage coefficient; the transverse wall type waterproof curtain (202) which is arranged transversely in the same thickness from the upper cavity vertical to the excavation direction and enters the waterproof stratum (1) for a certain depth is connected with the wall type waterproof curtains on the two sides into a whole to form the closed vertical wall type waterproof curtain (2).

2. The mine underground tunnel waterproof curtain of claim 1, wherein the two side wall waterproof curtains (201) and the transverse wall waterproof curtain (202) are grouting bodies.

3. The mine underground tunnel waterproof curtain of claim 1, wherein a plurality of transverse wall type waterproof curtains are arranged at intervals.

4. The mine underground tunnel waterproof curtain of claim 1, wherein a lower guide hole (4) is arranged below an upper guide hole (3) in the area inside the tunnel waterproof curtain; and constructing a tunnel structure in the upper and lower guide holes.