CN111851507B - Construction method of pile-arch conversion structure system - Google Patents
Construction method of pile-arch conversion structure system Download PDFInfo
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- CN111851507B CN111851507B CN202010567485.8A CN202010567485A CN111851507B CN 111851507 B CN111851507 B CN 111851507B CN 202010567485 A CN202010567485 A CN 202010567485A CN 111851507 B CN111851507 B CN 111851507B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/08—Restraining of underground water by employing open ditches arranged below the level of the water
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/045—Underground structures, e.g. tunnels or galleries, built in the open air or by methods involving disturbance of the ground surface all along the location line; Methods of making them
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/22—Piles
Abstract
The invention discloses a construction method of a pile-arch conversion structure system, which comprises the steps of monitoring an existing subway section, excavating foundation pit earth and stone, cutting an arch conversion beam, manufacturing and processing conversion beam reinforcing steel bars, performing pile foundation operation and constructing a pile-arch conversion structure. A pile-arch conversion structure is adopted to cross a subway section, and a buffer layer is arranged between the pile-arch conversion structure and surrounding rocks at the top of a tunnel. The pile-arch conversion structure system can replace a straight beam and pile conversion structure system, the size of the conversion structure is reduced, and the load of the conversion structure is reduced; the stress advantage of the arch structure is fully exerted, the surrounding rock pressure is dispersed by the buffer layer, and the influence on the existing tunnel is reduced.
Description
Technical Field
The invention belongs to the technical field of engineering construction, and particularly relates to a construction method of a pile-arch conversion structure system.
Background
With the development of urban subways and national railways, the construction problem that a railway station approaches to an existing subway is increasingly remarkable, and particularly the engineering problem that the existing tunnel is spanned on a railway station house is urgently solved.
In the prior art, an existing tunnel is spanned on a straight beam and pile structure, on the premise of meeting design requirements, the required section size of the straight beam and the piles is large, the quantity of the piles is increased, the reinforcement quantity is increased, and the clear distance between the lower edge of the beam and the vault of the tunnel is reduced; the excavated earth volume is correspondingly increased in the construction process, and the disturbance to the tunnel is large; the diameter and the number of the piles are increased, so that the disturbance of the middle rock clamping construction of the existing double-hole tunnel is increased, and the stress of the tunnel is unfavorable; increasing construction cost and construction period.
Disclosure of Invention
The invention aims to mainly solve the problems of disturbance of pile construction to the existing tunnel, disturbance of foundation pit excavation to the existing tunnel, large-section arch reinforcing steel bar construction positioning, large-volume concrete hydration heat and the like.
The technical scheme adopted by the invention for solving the technical problems is as follows: the construction method of the pile-arch conversion structure system comprises the following steps
(1) Excavating the earth and stone of the foundation pit: the static cutting mode is adopted for layered comprehensive excavation, so that the integrity of the foundation pit is ensured
(11) Performing static cutting by adopting a diamond wire saw chain and a rhinestone in a range of 2 meters above the conversion arched beam, performing vertical cutting separation on the rest area above the conversion arched beam by adopting a large-scale rock cutting machine, and performing horizontal separation from the side by using a large-scale hooking machine;
(12) cutting earth and stone: a 3m rock cutting machine is adopted for layered cutting, the cutting depth of each layer is controlled within 1.5m, and the requirement of 3m layered excavation of simulation checking calculation is met;
(2) cutting arch conversion beam
(21) Excavating edge lines: cutting the bottom of the arched conversion beam into an inclined plane by using a diamond wire saw;
(22) and (3) drilling construction: locally repairing the arched conversion beam by using a rhinestone to enable the bottom of the foundation pit to be arched;
(23) manually trimming corners: adopting manual trimming (manual chiseling and C20 concrete plastering) to enable the bottom of the foundation pit to be arched, thereby finishing the construction of the cushion layer;
(3) manufacturing a transfer beam reinforcement: processing an arch beam stirrup, performing three-dimensional lofting in advance according to the size of the arch beam, and performing size control on the arc of the arch beam stirrup so as to ensure the processing quality of a main rib of the arch beam, checking and calculating the load of a reinforcing steel bar in advance, processing a reinforcing steel bar bracket to ensure the construction safety, uniformly arranging reinforcing steel bars of piles around the main rib of the pile, and then pouring C45 anti-corrosion concrete;
(4) tunnel monitoring
Carrying out horizontal clearance convergence automatic monitoring and vault settlement automatic monitoring on a tunnel at the bottom of a foundation pit, carrying out manual monitoring on horizontal/vertical displacement of a tunnel structure, horizontal displacement of a ballast bed, settlement of the ballast bed and the like, carrying out automatic monitoring on construction vibration speed, and carrying out field inspection on a crack of the tunnel structure;
(5) pile foundation operation
According to the sandstone geological conditions, the hole digging pile construction is carried out manually by adopting a water drill, and when the original tunnel anchor rod is encountered, the static cutting is carried out by adopting the water drill, so that the influence on the tunnel structure is not generated;
(6) pile arch conversion
(61) A pile-arch conversion structure is adopted to cross a subway section, and a buffer layer is arranged between the pile-arch conversion structure and surrounding rock at the top of a tunnel so as to form a pile-arch conversion structure-buffer layer-surrounding rock-tunnel system;
(62) respectively processing an arched beam main rib, an arched beam bottom rib and an arched beam gluten, assembling the arched beam main rib, the arched beam bottom rib and the arched beam gluten into a conversion arched beam through an arched beam stirrup, then performing three-dimensional lofting on the arched beam in advance according to the size of the arched beam, and performing size control on the arc shape of the arched beam, thereby ensuring the processing quality of the arched beam main rib;
(63) positioning the steel bars of the conversion beam: according to the arch size of the bottom of the conversion beam and the length of the steel bars, the steel bar joint is placed in advance, and the steel bar joint is placed in the 1/3 midspan position with smaller stress;
(64) setting a conversion beam steel bar support: the conversion beam steel bar support is formed by processing channel steel and angle steel, the beam and the upright post are 10# channel steel, the column foot plate is 1m long 14a # channel steel, the inclined strut is 50 x 50 angle steel with the length of 600mm, the distance between the beams is 2.5m, the distance between the upright posts is less than or equal to 2.8m, and the height of the upright post is less than or equal to 4.5m
(65) And (6) pouring concrete.
Furthermore, monitoring points are buried in the tunnel in the track traffic interval in the foundation pit excavation process in the step (1), settlement, horizontal displacement and vertical displacement of the interval tunnel structure, the vault, the ballast bed and other structures are monitored, excavation vibration speed is monitored, the vibration speed is controlled to be 2cm/s through simulation calculation, the monitoring points are monitored as a warning value according to 1.5cm/s, and therefore safety of foundation pit earth and stone excavation on the tunnel structure in the track traffic interval is guaranteed.
Further, the drainage of the foundation pit is controlled according to the layering in the construction process in the step (1), a drainage ditch and a water collecting well are respectively built at the top of the pit and at the bottom slope foot of the pit in a visible drainage mode in the foundation pit, the foundation pit is excavated in an uphill drainage mode, the accumulated water of the foundation pit can be drained to the water collecting well in the pit at any time and then is drained to the outside of the pit, and therefore the stability of the foundation pit and the stability of the tunnel structure of the bottom rail transit section are guaranteed.
The invention has the technical effects that:
1, optimizing a foundation pit excavation method, monitoring the deformation of the existing tunnel in real time, and realizing the control of the influence of the foundation pit excavation on the existing tunnel.
And 2, forming a key technology of a pile-arch conversion structure-buffer layer-surrounding rock-tunnel interaction system based on numerical simulation, model test and field monitoring.
3, ensuring the processing precision of the arc-shaped reinforcing steel bar based on three-dimensional lofting; the proportioning of the mass concrete is optimized, the hydration heat of the mass concrete is controlled, and the mass concrete is prevented from cracking due to temperature stress; the self-compacting concrete suitable for the dense reinforcing steel bars is developed, and finally, a large-section large-diameter arched girder construction quality control technology is formed.
The pile-arch conversion structure system can replace a straight beam and pile conversion structure system, the size of the conversion structure is reduced, the load of the conversion structure is reduced, the construction is simplified, the influence on the existing tunnel is reduced, the pile-arch conversion system is adopted in the improved technology, the straight beam is changed into the arch, the stress advantage of the arch structure is fully utilized, the section size is reduced, and the clear distance between the beam and the tunnel is increased; the disturbance to the existing tunnel in excavation square amount and construction is reduced.
Drawings
FIGS. 1-3 are schematic views of a transfer beam cut in sequence in accordance with the present invention;
FIG. 4 is a schematic structural view of a transfer beam dome of the present invention;
FIG. 5 is a schematic view of the construction of the present invention after the transfer beam dome and transfer beam are joined;
FIG. 6 is a schematic structural view of a pile-arch conversion structure of the present invention;
FIGS. 7 to 8 are schematic views of the tunnel settlement monitoring point at the bottom of the foundation pit according to the invention;
FIG. 9 is a structural view of a transfer beam rebar bracket of the present invention;
fig. 10 is a structural view of a conversion beam reinforcing steel bar bracket joint of the invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
The general conversion structure is a conversion system with a straight beam and a pile, and when a large load is faced, the straight beam scheme is stressed greatly, the structural design size is large, and the construction is difficult. The existing pile-arch conversion structure system can reduce the size of the conversion structure and simplify the construction. The invention relates to a construction method of a pile-arch conversion structure system, which mainly aims at excavation of foundation pit earth and stone of a pile-arch conversion structure, monitoring of a bottom tunnel, reinforcement binding of a large-section arched beam and large-volume concrete pouring.
The north station south station house and the city corridor of Chongqing of proposing to build all lie in and open the ten lines of tunnel rail transit of the section of secretly digging of operation, and the city corridor will adopt open cut method excavation for the section of secretly digging is become shallow tunnel by deeply burying the tunnel in the district, consequently needs research transformation engineering to the influence of secretly digging interval tunnel safety.
The pile foundation of the construction project adopting the pile-arch conversion structure form is a manual hole digging pile, the pile diameter is 2m, the pile length is 12m, the pile bottom bearing layer is positioned at the upper part of a tunnel between sections of track traffic, the minimum distance between the pile bottom bearing layer and the tunnel between the sections of ten lines of track traffic is only 2m, the maximum cross-section size of the conversion arched beam is 4.5m, and the minimum distance between the pile bottom bearing layer and the tunnel between the sections of ten lines of track traffic is only 2.5 m.
The technical scheme of the invention mainly comprises the steps of controlling the size and elevation of the arch beam foundation pit excavation, monitoring the disturbance of the existing tunnel in the excavation process, monitoring the disturbance of the existing tunnel in the pile foundation construction, processing, positioning and installing the large-diameter reinforcing steel bars of the arch beam, and calculating, proportioning and pouring maintenance of hydration heat of mass concrete.
The geology of the Chongqing north station is sandstone, the rock strength is hard and can reach about 40Mpa, according to the conversion structure scheme, the minimum distance between the bottom of the conversion arched girder and a tunnel between ten lines of rail transit is only 2.5m, and the minimum distance between the pile foundation and the tunnel between ten lines of rail transit is only 2m, so that a static cutting mode is adopted in the excavation process of foundation pit earthwork, and the influence of the excavation of the earthwork on the tunnel between the ten lines of rail transit at the bottom is controlled.
(1) And excavating the earth and stone of the foundation pit.
In order to guarantee that excavation of foundation pit earth and stone does not influence the interval tunnel structure of bottom track traffic, refine the construction scheme strictly according to simulation checking calculation in the work progress, adopt quiet power cutting mode: the excavation of foundation ditch earth and stone adopts the layering to excavate comprehensively to guarantee the foundation ditch wholeness.
The conversion arched beam and the range of 2 meters above adopt diamond wire saw chain cooperation water drill to carry out static cutting, and the vertical separation of cutting is carried out in all the other upper portions region adoption large-scale rock cutting machine, uses large-scale machine of colluding to carry out horizontal separation from the side. The 3m rock cutting machine is adopted for layered cutting, the cutting depth of each layer is controlled within 1.5m, and the requirement of 3m layered excavation of simulation checking calculation is met.
In the process of excavation of the foundation pit, monitoring points are buried in the tunnel in the track traffic interval, settlement, horizontal displacement and vertical displacement of the interval tunnel structure, the vault, the ballast bed and other structures are monitored, excavation vibration speed is monitored, the vibration speed is controlled to be 2cm/s through simulation calculation, the monitoring points are monitored as warning values according to 1.5cm/s, and therefore safety of excavation of the foundation pit earthwork on the tunnel structure in the track traffic interval is guaranteed.
The drainage of the foundation pit is controlled according to the layering in the construction process, a drainage ditch and a water collecting well are built at the top of the pit and at the bottom slope foot of the pit respectively in a surface drainage mode in the foundation pit, slope excavation is carried out in the foundation pit, the accumulated water of the foundation pit can be discharged to the water collecting well in the pit at any time and then is pumped out of the pit, and therefore the stability of the foundation pit and the stability of the tunnel structure of the bottom track traffic interval are guaranteed.
(2) Provided is an arch conversion beam cutting method.
The first step is as follows: as shown in fig. 1, according to the diamond wire saw cutting method, firstly, the steel wire saw is constructed to the bottom of an arch transfer beam and cut into inclined planes;
the second step is that: as shown in fig. 2, the rhinestone is used for locally repairing the arched transfer beam, so that the bottom of the foundation pit is arched;
the third step: as shown in fig. 3, the bottom of the foundation pit is arched by manual trimming (manual chiseling and plastering with C20 concrete), so that the construction of the cushion layer is completed.
(3) And manufacturing the transfer beam reinforcing bars.
As shown in fig. 4 and 5, the arch beam stirrups are processed in a factory, so that the precision and the quality of the stirrups are controlled, three-dimensional lofting is carried out in advance for the size of the arch beam, size control is carried out on the arc of the arch beam, the processing quality of the main reinforcements of the arch beam is guaranteed, self-compacting concrete is adopted for pouring according to the dense condition of large-section reinforcements, effective measures are taken to reduce hydration heat during large-volume waterproof concrete construction, the concrete quality is guaranteed, and when a pile hole is constructed to a design holding layer, a first party is informed to survey a design and perform construction of a next procedure after related quality testing personnel jointly check that the grooves meet design requirements.
(4) And monitoring the tunnel.
As shown in fig. 6 and 7, the horizontal clearance convergence automatic monitoring and the vault settlement automatic monitoring are carried out on the tunnel at the bottom of the foundation pit, the tunnel structure horizontal displacement, the vertical displacement, the ballast bed horizontal displacement, the ballast bed settlement and the like are manually monitored, the construction vibration speed is automatically monitored, and the field inspection is carried out on the cracks of the tunnel structure.
The pile foundation adopts artifical hole digging pile to be under construction, according to sandstone geological conditions, adopts the water to bore and is under construction, meets former tunnel stock and adopts the water to bore and carry out static cutting, guarantees not to produce the influence to its tunnel structure.
(5) And (5) pile foundation operation.
According to sandstone geological conditions, the water drill is adopted to carry out hole digging pile construction through manual work, and the water drill is adopted to carry out static force cutting when encountering an original tunnel anchor rod, so that the influence on the tunnel structure is not generated.
(6) And (5) pile arch conversion.
In the conversion form of the conversion structure, if a conversion mode of adding piles to the straight beam is adopted, the minimum distance between the beam bottom and the arch crown of the interval tunnel is less than 1 meter (the maximum value of the conversion load design is about 48000 kN), and the support anchor rod of the interval tunnel needs to be cut off, so that the construction risk is high.
If a mode that the conversion arch and the pile span the subway section is adopted, the minimum distance between the bottom of the conversion arch and the vault of the subway section can reach more than 2 meters, and therefore the influence of the reconstruction engineering on the section tunnel is greatly reduced.
Therefore, the engineering has the advantages of large conversion load, large conversion deflection due to the fact that the straight beams are adopted and the piles are added, large construction risk of a conversion system is achieved, and the safety of the existing tunnel is improved due to the fact that the pile-arch conversion structure system is adopted. Therefore, the interaction mechanism between the pile-arch conversion structure and the stratum is researched specially, the interaction mechanism of the pile-arch conversion structure-buffer layer-surrounding rock-tunnel system is basically determined through numerical simulation and model test, the influence of the deep burying of the existing tunnel after excavation of the foundation pit and the influence of the dead weight and the upper load of the pile-arch conversion structure on the interval tunnel at the later stage are analyzed through numerical calculation, and the feasibility of the pile-arch conversion structure is proved. And in the later construction process, the depth and the excavation mode of the earth and stone excavation are refined according to the numerical calculation result, so that the influence of the depth and the excavation mode on the interval tunnel is controlled. But in order to further know the stress mechanism of the pile-arch conversion system in the construction process, the safety of the existing tunnel is ensured and the deformation of the pile-arch conversion structure is controlled by monitoring the internal force and the deformation of the existing tunnel and pile-arch conversion structure in the construction process on site, so that the dynamic design construction is realized.
The conversion arched girder of the subject is divided into three types, wherein the size of the conversion arched girder with the largest section is 4.2m multiplied by 4.5m, the angles of the arched positions of the tunnel according to the track traffic interval are 94.44 degrees and 102.36 degrees respectively, the size of the section of the girder is larger, the diameter of the steel bar is larger, the steel bar is denser, the gluten of the arched girder is 72 HRB400 steel bars with the diameter of 40mm, and the bottom bar is 96 HRB400 steel bars with the diameter of 40 mm. The construction quality control is mainly performed by the manufacturing and installation of the arched girder steel bars and the pouring of large-volume concrete. Aiming at the construction difficulty of the project, the arch beam stirrups are processed in a factory, so that the precision and the quality of the stirrups are controlled, the arch beam size is three-dimensionally lofted in advance, the arc shape is subjected to size control, the processing quality of the main reinforcements of the arch beam is ensured, the reinforcement load is checked in advance, and the construction safety is ensured by processing the reinforcement support. Aiming at the large-volume concrete pouring with dense reinforcing steel bars, the concrete mixing proportion is pre-matched by butting with a mixing station in advance, and the concrete pouring quality is controlled by adopting self-compacting concrete.
Positioning the conversion beam steel bars: according to the arched size of the bottom of the transfer beam and the length of the steel bars, the steel bar joint is lofted in advance, and the steel bar joint is placed in the 1/3 midspan position with smaller stress.
Supporting the transfer beam by steel bar section steel: as shown in fig. 9 and 10, the conversion beam steel bar support is formed by processing channel steel and angle steel, the beam and the column are 10# channel steel, the column foot plate is 1m long 14a # channel steel, the diagonal brace is 50 x 50 angle steel with the length of 600mm, the distance between the beams is 2.5m, the distance between the columns is less than or equal to 2.8m, and the height of the column is less than or equal to 4.5 m.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art; the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (3)
1. A construction method of a pile-arch conversion structure system is characterized by comprising the following steps: comprises the following steps
(1) Excavation of earth and stone of foundation pit
(11) Performing static cutting by adopting a diamond wire saw chain and a rhinestone in a range of 2 meters above the conversion arched beam, performing vertical cutting separation on the rest area above the conversion arched beam by adopting a large-scale rock cutting machine, and performing horizontal separation from the side by using a large-scale hooking machine;
(12) carrying out layered cutting by adopting a rock cutting machine, wherein the cutting depth of each layer is controlled within 1.5 m;
(2) cutting arch conversion beam
(21) Excavating edge lines: cutting the bottom of the arched conversion beam into an inclined plane by using a diamond wire saw;
(22) and (3) drilling construction: locally repairing the arched conversion beam by using a rhinestone to enable the bottom of the foundation pit to be arched;
(23) and (3) manual corner trimming: manually picking and chiseling and plastering by using C20 concrete to enable the bottom to be arched;
(3) manufacturing a transfer beam reinforcement:
processing an arch beam stirrup, performing three-dimensional lofting in advance according to the size of the arch beam, checking and calculating the load of reinforcing steel bars in advance, processing a reinforcing steel bar bracket, uniformly arranging reinforcing steel bars of the pile around a main reinforcing steel bar of the pile, and then pouring anti-corrosion concrete;
(4) tunnel monitoring
Carrying out horizontal clearance convergence automatic monitoring and vault settlement automatic monitoring on an existing tunnel of a foundation pit, carrying out manual monitoring on horizontal/vertical displacement of a tunnel structure, horizontal displacement of a ballast bed and settlement of the ballast bed, carrying out automatic monitoring on construction vibration speed, and carrying out field inspection on cracks of the tunnel structure;
(5) pile foundation operation
According to sandstone geological conditions, carrying out hole digging pile construction by manually adopting a water drill, and carrying out static cutting by adopting the water drill when encountering the original tunnel anchor rod;
(6) pile arch conversion
(61) A pile-arch conversion structure is adopted to cross a subway section, and a buffer layer is arranged between the pile-arch conversion structure and the top of the tunnel;
(62) respectively processing an arched beam main rib, an arched beam bottom rib and an arched beam gluten, assembling the arched beam main rib, the arched beam bottom rib and the arched beam gluten into a conversion arched beam through an arched beam stirrup, and then controlling the size of the arc of the conversion arched beam;
(63) and positioning the conversion beam reinforcing steel bars, arranging a conversion beam reinforcing steel bar support, and finally pouring concrete.
2. The construction method of the pile-arch conversion structure system according to claim 1, wherein in the step (1), monitoring points are buried in the track traffic interval tunnel in the excavation process of the foundation pit, the settlement, horizontal and vertical displacement of the interval tunnel structure, the vault and the ballast bed structure are monitored, the excavation vibration speed is monitored, the vibration speed is controlled to be 2cm/s through simulation calculation, and the monitoring points are monitored according to the alarm value of 1.5cm/s, so that the safety of the track traffic interval tunnel structure in the excavation of the foundation pit earth and stone is ensured.
3. The construction method of a pile-arch conversion structural system according to claim 1, wherein in the step (1), drainage of the foundation pit is controlled according to layers in the construction process, drainage ditches and water collecting wells are built at the top and the bottom slope feet of the foundation pit respectively in a surface drainage mode in the foundation pit, slope excavation is carried out in the foundation pit, and accumulated water in the foundation pit can be drained to the water collecting well in the pit at any time and then is pumped out of the pit, so that stability of the foundation pit and stability of a tunnel structure in a bottom rail traffic interval are guaranteed.
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