CN113832947A - Device and method for reinforcing multiple-track railway with small space passing under shield tunnel - Google Patents
Device and method for reinforcing multiple-track railway with small space passing under shield tunnel Download PDFInfo
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- CN113832947A CN113832947A CN202111308001.9A CN202111308001A CN113832947A CN 113832947 A CN113832947 A CN 113832947A CN 202111308001 A CN202111308001 A CN 202111308001A CN 113832947 A CN113832947 A CN 113832947A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/48—Foundations inserted underneath existing buildings or constructions
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D33/00—Testing foundations or foundation structures
Abstract
The invention relates to the technical field of shield tunnels, in particular to a device and a method for reinforcing a multi-track railway with small space passing under a shield tunnel; transverse lifting beam bundles are connected between every two transverse adjacent longitudinal beam bundles, gusset plates are embedded in two ends of each transverse lifting beam bundle, and the gusset plates are connected with the longitudinal beam bundles at the two ends by using brackets; the transverse lifting beam is arranged below the railway track; the bar-shaped foundation is arranged in the U-shaped groove die, the reinforcement cage is embedded in the bar-shaped foundation, the through long reinforcement is arranged in the reinforcement cage in a penetrating manner, and the plurality of reinforcement cage limiting pieces are fixed on the inner wall of the U-shaped groove die; the support base plate is embedded at the top of the steel reinforcement cage, a plurality of anchor bars are vertically arranged at the bottom of the support base plate, limiting steel plates are symmetrically welded at the top of the support base plate, and the D24 type temporary beam and the D16 type temporary beam are both clamped between the limiting steel plates symmetrically arranged. A built-in monitoring system ensures that problems can be found as early as possible and can be prevented from happening in the bud; the combined underpinning beam improves the rigidity of the reinforcing device and can meet the requirements of wider construction environment and construction technology.
Description
Technical Field
The invention relates to the technical field of shield tunnels, in particular to a device and a method for reinforcing a multi-track railway with small space passing under a shield tunnel.
Background
The shield tunnel passes through a small-spacing multi-track railway downwards, the whole length is reinforced by a D-shaped temporary beam, and the latter is a common construction technology commonly adopted when underground structures such as a downward-passing tunnel, a small bridge, a pipeline, a culvert and the like are constructed on the existing railway line. According to the traditional D-shaped temporary beam construction scheme, after concrete is poured into the excavated buttress (mostly adopting a pile foundation), a longitudinal beam is erected, and a transverse lifting beam is erected on the longitudinal beam. Therefore, the construction workload is large, the floor space of the D-shaped temporary beam pile foundation is insufficient, overhead contact networks above the track are dense, the potential safety hazard of large-scale construction equipment entering the field is large, and the construction is difficult to implement particularly in a peripheral sensitive building dense area. Therefore, in the actual design and construction process, in order to solve the problems, the overhead contact system of the station track is usually powered off, even the overhead contact system is dismantled, and the range of a railway line control area is temporarily expanded so as to create a convenient beam foundation construction condition. Although the method can effectively avoid the related technical problems brought by the traditional D-shaped temporary beam construction, the construction period is longer, uncontrollable factors are increased and railway transportation is seriously influenced due to the fact that the overhead contact system is powered off or the related procedures required for dismantling the overhead contact system are declared and the possible land acquisition problem related to the enlargement of a railway line control area is solved; and facing to the railway lines with small track spacing and large track number, the D-shaped construction beam foundation is difficult to have a landing space. Therefore, how to reduce the construction period and the surrounding environment influence and ensure the pavement reinforcement quality becomes another difficult problem in the field.
Disclosure of Invention
The invention aims to overcome the defects and shortcomings of the prior art, provides a device and a method for reinforcing a small-distance multi-track railway passing through the lower part of a shield tunnel, and solves the problems of insufficient landing space of the traditional D-shaped temporary beam foundation and potential safety hazard of large-scale mechanical approach; and adopt many monitoring means to verify and record each other, the built-in monitoring system ensures that the problem can be found as early as possible, defends suffering from in the bud; the combined underpinning beam improves the rigidity of the reinforcing device and can meet the requirements of wider construction environment and construction technology.
In order to achieve the purpose, the invention adopts the following technical means: the device comprises a D-shaped temporary beam, a middle elastic foundation beam, an outer elastic foundation beam, a U-shaped groove die and a built-in monitoring system;
the D-shaped temporary beam comprises a longitudinal beam, a transverse lifting beam, a concrete cushion, brackets and gusset plates; the longitudinal beam is composed of a D24 type temporary beam and a D16 type temporary beam, the D24 type temporary beam is erected on the middle elastic foundation beam and the outer elastic foundation beam which cross the shield region, and the D16 type temporary beam is erected on the middle elastic foundation beam and the outer elastic foundation beam which are outside the D24 type temporary beam; transverse lifting beam bundles are connected between every two transverse adjacent longitudinal beam bundles, gusset plates are embedded in two ends of each transverse lifting beam bundle, and the gusset plates are connected with the longitudinal beam bundles at the two ends by using brackets; the transverse lifting beam is arranged below the railway track;
the middle elastic foundation beam is arranged at the middle position of the plurality of railway tracks;
the outer elastic foundation beams are arranged at the outer side positions of the plurality of railway tracks;
the U-shaped groove dies are arranged in the middle and on the outer sides of the adjacent tracks, and the middle elastic foundation beam and the outer elastic foundation beam are arranged in the U-shaped groove dies;
the middle elastic foundation beam and the outer elastic foundation beam form an elastic foundation beam framework, and the middle elastic foundation beam and the outer elastic foundation beam both comprise a strip foundation, a steel reinforcement cage limiting sheet, a through long steel reinforcement, a support base plate, an anchor bar, a steel reinforcement cage and a limiting steel plate; the bar-shaped foundation is arranged in the U-shaped groove die, the reinforcement cage is embedded in the bar-shaped foundation, the through long reinforcement is arranged in the reinforcement cage in a penetrating manner, and the plurality of reinforcement cage limiting pieces are fixed on the inner wall of the U-shaped groove die; the support base plate is embedded at the top of the reinforcement cage, a plurality of anchor bars are vertically arranged at the bottom of the support base plate, limiting steel plates are symmetrically welded at the top of the support base plate, and the D24 type temporary beam and the D16 type temporary beam are both clamped between the limiting steel plates which are symmetrically arranged;
the built-in monitoring system is arranged in the middle elastic foundation beam, the outer elastic foundation beam and the concrete cushion layer at the bottom of the U-shaped groove mold, is led out through a data line and is connected to the control center;
the built-in monitoring system comprises a soil pressure box, a steel bar stress meter and a void displacement monitoring meter; the soil pressure box is arranged in the concrete cushion layer and is arranged in a subsider influence area tunneled by the shield tunnel; the steel bar stressometers) are arranged in the through-length steel bars at the upper and lower rows and are fixed in a steel bar cage; the void displacement monitor is embedded at the top of the elastic foundation beam framework.
Preferably, a plurality of cable preformed holes are formed in the position, corresponding to the soil pressure box, of the bottom plate of the U-shaped groove die in a penetrating mode, a plurality of cable preformed grooves are formed in the inner side plate wall of the U-shaped groove die, and a plurality of hoisting holes and grouting holes are formed in the inner side plate wall of the U-shaped groove die in a penetrating mode.
The method for reinforcing the multi-track railway with small passing intervals under the shield tunnel comprises the following operation steps:
firstly, manually digging grooves in a subsection manner along the direction of a railway track according to the size of an elastic foundation beam (namely a middle elastic foundation beam and an outer elastic foundation beam) to dig grooves in parallel, and if necessary, adopting a temporary soil retaining measure to prevent the grooves of the elastic foundation beam from collapsing;
step two, after the groove of the sectional elastic foundation beam is grooved, embedding a soil pressure box at the bottom of the groove, laying a concrete cushion layer after sealing the soil pressure box and externally connecting and protecting a data line, before the cushion layer is initially set, using a rail crane to hoist a U-shaped groove die prefabricated in a factory into the groove of the elastic foundation beam through a hoisting hole, and enabling the data line of the soil pressure box to penetrate through a cable preformed hole and be fixed in the cable preformed groove;
after the U-shaped groove mold is in place, pressing slurry to soil bodies on two sides by using a slurry injection hole reserved on a side plate of the U-shaped groove mold, filling gaps of the soil bodies, improving the stability of the soil bodies, and improving the connection and stress characteristics of the U-shaped groove mold and the soil bodies;
fourthly, a reinforcement cage limiting piece is installed on the inner side of the U-shaped groove die, a manufactured reinforcement cage outside a field is transported and installed by using a rail crane, a reinforcement stress meter is installed at a preset position of the reinforcement cage, a data line is fixed on a full-length reinforcement, the data line is arranged in a cable preformed groove on the inner wall of the U-shaped groove die, and the end part of the data line extends out of the surface of the concrete strip-shaped foundation structure; mounting a support base plate and an anchor bar at the top of the reinforcement cage, and embedding a void displacement monitor at the top;
fifthly, sealing of the reinforcing steel bar stress meter and the void displacement monitoring meter and pouring concrete after external protection of the data line are well performed to form a strip foundation;
step six, repeating the step one to the step five until the construction of all the middle elastic foundation beams and the outer elastic foundation beams is completed;
step seven, extracting an original old sleeper plug from the initial point at intervals of six sleepers, adjusting the distance between adjacent old sleepers, and after finishing, inserting a transverse lifting beam and tamping the track bed;
step eight, horizontally placing the D24 type temporary beams on the elastic foundation beams crossing the shield area by using a rail crane, after the D24 type temporary beams are placed in position, respectively horizontally placing the D16 type temporary beams on the elastic foundation beams outside the D24 type temporary beams by using the rail crane, and repeating the step until all the longitudinal beam on the middle elastic foundation beams and the outer elastic foundation beams are placed in position;
step nine, connecting a transverse lifting beam for supporting a track with longitudinal beams at two ends through a gusset plate and a bracket;
tenthly, after the D-shaped temporary beam is in place, welding limiting steel plates and support base plates pre-embedded at the upper part of the elastic foundation beam on two sides of a longitudinal beam in the D-shaped temporary beam to prevent the D-shaped temporary beam from moving transversely;
step eleven, determining reference points and monitoring points, connecting all monitor data lines (including a soil pressure cell with a built-in monitoring system, a steel bar stress meter and a void displacement monitoring meter) to a control center, and debugging the internal force and displacement real-time monitoring system of the reinforcing device;
step twelve, performing downward penetration construction of the shield tunnel, monitoring in real time, and predicting the trend;
and thirteen, dismantling the D-shaped temporary beam and recovering the normal operation of the railway.
Compared with the prior art, the invention has the beneficial effects that:
1. the groove of the D-shaped temporary beam foundation is excavated manually, partition segmentation and flexible and rapid construction under the condition of small-spacing multi-track railways can be met, and the problems of insufficient landing space and large mechanical approach potential safety hazard of the traditional D-shaped temporary beam pile foundation are solved;
2. the adopted elastic foundation beam and the D-shaped temporary beam form a combined underpinning longitudinal beam, so that the overall rigidity of a underpinning system is improved, the stratum disturbance caused by shield tunneling is reduced, and stratum displacement is caused, which is mainly shown as foundation settlement in the construction process of passing a railway under a shield tunnel, and further railway track settlement is caused, and travelling is damaged;
3. by the aid of the built-in monitoring system and the monitoring data processing system, deformation and stress are monitored and predicted in real time, errors and misinformation caused by human factors due to long time intervals of traditional safety monitoring are solved, various monitoring means are mutually verified and recorded, problems can be found as soon as possible, and the problems are prevented;
4. the U-shaped groove die of the factory prefabrication that adopts can be customized according to the demand is nimble, and the design such as the slip casting hole of reserving on the U-shaped groove die, cable preformed hole, cable preformed groove not only effectively guarantees slot stability, can also protect monitoring element data line from destroying, acquires more accurate comprehensive monitoring data, can satisfy more extensive construction environment and construction technical requirement.
Description of the drawings:
FIG. 1 is a plan view of the overall system of the present invention.
Figure 2 is a longitudinal cross-sectional view of the overall system of the present invention.
Figure 3 is a cross-sectional view of the overall system of the present invention.
FIG. 4 is a schematic structural diagram of the strip foundation, the support base plate, the anchor bars and the limiting steel plate of the present invention.
Fig. 5 is a schematic structural view of the reinforcement cage of the present invention.
Fig. 6 is a schematic structural view of a U-shaped slot die in the present invention.
FIG. 7 is a schematic view of the inner side structure of the side plate of the U-shaped slot die of the present invention.
FIG. 8 is a schematic view of the outer side structure of the side plate of the U-shaped slot die in the present invention.
FIG. 9 is a schematic view of the bottom plate structure of the U-shaped slot die of the present invention.
FIG. 10 is a flow chart of the construction of the present invention.
Description of reference numerals:
the device comprises a railway track 1, a middle elastic foundation beam 2, an outer elastic foundation beam 3, a U-shaped groove mold 4, a strip foundation 5, a D24 type temporary beam 6, a D16 type temporary beam 7, a longitudinal beam 8, a transverse beam 9, a concrete cushion layer 10, a bracket 11, a gusset plate 12, a soil pressure box 13, a steel bar stress meter 14, a steel bar cage limiting sheet 15, a through long steel bar 16, a support base plate 17, an anchor bar 18, a shield tunnel 19, a steel bar cage 20, a hoisting hole 21, a grouting hole 22, a cable preformed hole 23, a limiting steel plate 24, a cable preformed groove 25 and a void displacement monitoring meter 26.
The specific implementation mode is as follows:
the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and the preferred embodiments in the description are only examples, and all other embodiments obtained by those skilled in the art without any inventive work belong to the protection scope of the present invention.
As shown in fig. 1 to 10, the following technical means are adopted in the present embodiment: the device comprises a D-shaped temporary beam, a middle elastic foundation beam 2, an outer elastic foundation beam 3, a U-shaped groove die 4 and a built-in monitoring system;
the D-shaped temporary beam comprises a longitudinal beam 8, a transverse lifting beam 9, a concrete cushion 10, a bracket 11 and a gusset plate 12; the longitudinal beam 8 is composed of a D24 type temporary beam 6 and a D16 type temporary beam 7, the D24 type temporary beam 6 is erected on the middle elastic foundation beam 2 and the outer elastic foundation beam 3 which cross the shield area, and the D16 type temporary beam 7 is erected on the middle elastic foundation beam 2 and the outer elastic foundation beam 3 which are outside the D24 type temporary beam 6; transverse lifting beams 9 are connected between every two transversely adjacent longitudinal beams 8, gusset plates 12 are embedded in two ends of each transverse lifting beam 9, and the gusset plates 12 are connected with the longitudinal beams 8 at the two ends through brackets 11; the transverse lifting beam 9 is arranged below the railway track 1;
the middle elastic foundation beam 2 is arranged at the middle position of the plurality of railway tracks 1;
the outer elastic foundation beams 3 are arranged at the outer positions of the plurality of railway tracks 1;
the U-shaped groove molds 4 are arranged in the middle and on the outer sides of adjacent tracks, and the middle elastic foundation beam 2 and the outer elastic foundation beam 3 are arranged in the U-shaped groove molds 4;
the middle elastic foundation beam 2 and the outer elastic foundation beam 3 form an elastic foundation beam framework, and both comprise a strip foundation 5, a reinforcement cage limiting piece 15, a through long reinforcement 16, a support base cushion plate 17, an anchor rib 18, a reinforcement cage 20 and a limiting steel plate 24; the bar-shaped foundation 5 is arranged in the U-shaped groove die 4, the reinforcement cage 20 is embedded in the bar-shaped foundation 5, the through reinforcement 16 penetrates through the reinforcement cage 20, and the plurality of reinforcement cage limiting pieces 15 are fixed on the inner wall of the U-shaped groove die 4; the support base plate 17 is embedded at the top of the reinforcement cage 20, a plurality of anchor bars 18 are vertically arranged at the bottom of the support base plate 17, limiting steel plates 24 are symmetrically welded at the top of the support base plate 17, and the D24 type temporary beam 6 and the D16 type temporary beam 7 are both clamped between the limiting steel plates 24 which are symmetrically arranged;
the built-in monitoring system is arranged in the middle elastic foundation beam 2, the outer elastic foundation beam 3 and the concrete cushion layer 10 at the bottom of the U-shaped groove mold 4, is led out through a data line and is connected to a control center;
the built-in monitoring system comprises a soil pressure cell 13, a steel bar stress meter 14 and a void displacement monitoring meter 26; the soil pressure box 13 is arranged in the concrete cushion 10 and is arranged in a subsider influence area tunneled by the shield tunnel; the steel bar stress meter 14 is arranged in the through long steel bars 16 at the upper row and the lower row and is fixed in the steel bar cage 20; the void displacement monitor 26 is embedded on the top of the elastic foundation beam framework.
As an optimized scheme, furthermore, a plurality of cable preformed holes 23 are formed in the position, corresponding to the soil pressure cell, of the bottom plate of the U-shaped groove die 4 in a penetrating manner, a plurality of cable preformed grooves 25 are formed in the inner side wall of the U-shaped groove die 4, and a plurality of hoisting holes 21 and grouting holes 22 are formed in the inner side wall of the U-shaped groove die 4 in a penetrating manner.
The method for reinforcing the multi-track railway with small passing intervals under the shield tunnel comprises the following operation steps:
firstly, manually digging grooves in a subsection manner along the railway track direction according to the size of an elastic foundation beam (namely a middle elastic foundation beam 2 and an outer elastic foundation beam 3) to dig grooves in parallel, and if necessary, adopting a temporary soil retaining measure to prevent the grooves of the elastic foundation beam from collapsing;
step two, after the groove of the sectional elastic foundation beam is formed, burying a soil pressure box 13 at the bottom of the groove, laying a concrete cushion layer 10 after sealing the soil pressure box and protecting the external connection of a data line, before the cushion layer is initially set, using a rail crane to hoist a U-shaped groove die 4 prefabricated in a factory into the groove of the elastic foundation beam through a hoisting hole 21, and enabling the data line of the soil pressure box 13 to penetrate through a cable preformed hole 23 and be fixed in a cable preformed groove 25;
after the U-shaped groove die 4 is in place, grouting soil on two sides by using grouting holes 22 reserved in side plates of the U-shaped groove die 4 to fill gaps of the soil, improve the stability of the soil and improve the connection and stress characteristics of the U-shaped groove die 4 and the soil;
fourthly, installing a reinforcement cage limiting piece 15 on the inner side of the U-shaped groove die 4, transporting and installing a manufactured reinforcement cage 20 outside a field by using a rail crane, installing a reinforcement stress meter 14 on the reinforcement cage 20 at a preset position, fixing a data line on a through-length reinforcement 16, arranging the data line in a cable preformed groove 25 on the inner wall of the U-shaped groove die 4, and extending the end part of the data line out of the structural surface of the concrete strip foundation 5; a support base plate 17 and an anchor bar 18 are arranged at the top of the reinforcement cage 20, and a void displacement monitor 26 is embedded at the top;
fifthly, sealing the reinforcing steel bar stress meter 14 and the void displacement monitoring meter 26, and pouring concrete after external protection of the data line to form a strip foundation 5;
step six, repeating the step one to the step five until all the middle elastic foundation beams 2 and the outer elastic foundation beams 3 are constructed;
step seven, extracting one original old sleeper plug from the initial point at intervals of six sleepers, adjusting the distance between adjacent old sleepers, inserting a transverse lifting beam 9 and tamping the track bed after finishing the adjustment;
step eight, horizontally placing the D24 type temporary beams 6 on the elastic foundation beams crossing the shield area by using a rail crane, after the D24 type temporary beams 6 are placed in position, similarly horizontally placing the D16 type temporary beams 7 on the elastic foundation beams outside the D24 type temporary beams 6 by using the rail crane respectively, and repeating the step until all the longitudinal beam 8 on the middle elastic foundation beams 2 and the outer elastic foundation beams 3 are placed in position;
step nine, connecting a transverse lifting beam 9 for supporting a track with longitudinal beams 8 at two ends through gusset plates and brackets;
tenthly, after the D-shaped temporary beam is in place, welding limiting steel plates 24 with support base plates 17 pre-embedded at the upper part of the elastic foundation beam on two sides of a longitudinal beam 8 in the D-shaped temporary beam to prevent the D-shaped temporary beam from moving transversely;
step eleven, determining reference points and monitoring points, connecting all monitor data lines (including a soil pressure cell 13 with a built-in monitoring system, a steel bar stress meter 14 and a void displacement monitoring meter 26) to a control center, and debugging a real-time monitoring system for internal force and displacement of the reinforcing device;
step twelve, the shield tunnel 19 is constructed in a downward penetrating mode, monitoring is carried out in real time, and the trend is predicted;
and thirteen, dismantling the D-shaped temporary beam and recovering the normal operation of the railway.
Compared with the prior art, the beneficial effects of the embodiment are as follows:
1. the groove of the D-shaped temporary beam foundation is excavated manually, partition segmentation and flexible and rapid construction under the condition of small-spacing multi-track railways can be met, and the problems of insufficient landing space and large mechanical approach potential safety hazard of the traditional D-shaped temporary beam pile foundation are solved;
2. the adopted elastic foundation beam and the D-shaped temporary beam form a combined underpinning longitudinal beam, so that the overall rigidity of a underpinning system is improved, the stratum disturbance caused by shield tunneling is reduced, and stratum displacement is caused, which is mainly shown as foundation settlement in the construction process of passing a railway under a shield tunnel, and further railway track settlement is caused, and travelling is damaged;
3. by the aid of the built-in monitoring system and the monitoring data processing system, deformation and stress are monitored and predicted in real time, errors and misinformation caused by human factors due to long time intervals of traditional safety monitoring are solved, various monitoring means are mutually verified and recorded, problems can be found as soon as possible, and the problems are prevented;
4. the U-shaped groove die of the factory prefabrication that adopts can be customized according to the demand is nimble, and the design such as the slip casting hole of reserving on the U-shaped groove die, cable preformed hole, cable preformed groove not only effectively guarantees slot stability, can also protect monitoring element data line from destroying, acquires more accurate comprehensive monitoring data, can satisfy more extensive construction environment and construction technical requirement.
It will be appreciated by those skilled in the art that modifications and equivalents may be made to the embodiments described above, and that various modifications, equivalents, improvements and the like may be made without departing from the spirit and scope of the invention.
Claims (3)
1. To the reinforcing apparatus of passing booth apart from many station roads railway under the shield tunnel, its characterized in that: the device comprises a D-shaped temporary beam, a middle elastic foundation beam (2), an outer elastic foundation beam (3), a U-shaped groove die (4) and a built-in monitoring system;
the D-shaped temporary beam comprises a longitudinal beam (8), a transverse lifting beam (9), a concrete cushion (10), a bracket (11) and a gusset plate (12); the longitudinal beam (8) is composed of a D24 type temporary beam (6) and a D16 type temporary beam (7), the D24 type temporary beam (6) is erected on the middle elastic foundation beam (2) and the outer elastic foundation beam (3) which cross the shield area, and the D16 type temporary beam (7) is erected on the middle elastic foundation beam (2) and the outer elastic foundation beam (3) which are outside the D24 type temporary beam (6); transverse lifting beam bundles (9) are connected between the transverse adjacent longitudinal beam bundles (8), gusset plates (12) are embedded in the two ends of the transverse lifting beam bundles (9), and the gusset plates (12) are connected with the longitudinal beam bundles (8) at the two ends by using corbels (11); the transverse lifting beam (9) is arranged below the railway track (1);
the middle elastic foundation beam (2) is arranged at the middle position of the plurality of railway tracks (1);
the outer elastic foundation beams (3) are arranged at the outer side positions of the railway tracks (1);
the U-shaped groove molds (4) are arranged in the middle and at the outer sides of the adjacent tracks, and the middle elastic foundation beam (2) and the outer elastic foundation beam (3) are arranged in the U-shaped groove molds (4);
the middle elastic foundation beam (2) and the outer elastic foundation beam (3) form an elastic foundation beam framework, and both the middle elastic foundation beam and the outer elastic foundation beam comprise a strip foundation (5), a reinforcement cage limiting piece (15), a through long reinforcement (16), a support base plate (17), an anchor bar (18), a reinforcement cage (20) and a limiting steel plate (24); the bar foundation (5) is arranged in the U-shaped groove die (4), the reinforcement cage (20) is embedded in the bar foundation (5), the through reinforcement (16) penetrates through the reinforcement cage (20), and the plurality of reinforcement cage limiting pieces (15) are fixed on the inner wall of the U-shaped groove die (4); the support base plate (17) is embedded at the top of the reinforcement cage (20), a plurality of anchor bars (18) are vertically arranged at the bottom of the support base plate (17), limiting steel plates (24) are symmetrically welded at the top of the support base plate (17), and the D24 type temporary beam (6) and the D16 type temporary beam (7) are clamped between the limiting steel plates (24) which are symmetrically arranged;
the built-in monitoring system is arranged in the middle elastic foundation beam (2), the outer elastic foundation beam (3) and the concrete cushion (10) at the bottom of the U-shaped groove mold (4), is led out through a data line and is connected to the control center;
the built-in monitoring system comprises a soil pressure box (13), a steel bar stress meter (14) and a void displacement monitoring meter (26); the soil pressure box (13) is arranged in the concrete cushion (10) and is arranged in a subsider influence area tunneled by the shield tunnel; the steel bar stress meter (14) is arranged in the through long steel bars (16) at the upper and lower rows and is fixed in the steel bar cage (20); the void displacement monitoring meter (26) is embedded at the top of the elastic foundation beam framework.
2. The reinforcing apparatus for the multi-track railway with small passing distance under the shield tunnel according to claim 1, wherein: the bottom plate of U type groove mould (4) corresponds soil pressure cell department and runs through and has seted up a plurality of cable preformed hole (23), and the curb plate inner wall of U type groove mould (4) has seted up a plurality of cable preformed groove (25), and the curb plate inner wall of U type groove mould (4) runs through and has seted up a plurality of hole for hoist (21) and slip casting hole (22).
3. The method for reinforcing the multi-track railway with small passing intervals under the shield tunnel comprises the following operation steps:
firstly, manually digging grooves in parallel along the railway track direction according to the size of the elastic foundation beam by beginning to segment, and adopting a temporary soil retaining measure to prevent the elastic foundation beam grooves from collapsing if necessary;
step two, after the groove of the sectional elastic foundation beam is grooved, burying a soil pressure box (13) at the bottom of the groove, paving a concrete cushion (10) after sealing the soil pressure box and externally connecting and protecting a data line, before the cushion is initially set, using a track crane to hoist a U-shaped groove die (4) prefabricated in a factory into the groove of the elastic foundation beam through a hoisting hole (21), and enabling the data line of the soil pressure box (13) to penetrate through a cable preformed hole (23) and be fixed in a cable preformed groove (25);
after the U-shaped groove mold (4) is in place, pressing soil bodies on two sides by using grouting holes (22) reserved on side plates of the U-shaped groove mold (4) to fill gaps of the soil bodies, improving the stability of the soil bodies and improving the connection and stress characteristics of the U-shaped groove mold (4) and the soil bodies;
fourthly, installing a reinforcement cage limiting piece (15) on the inner side of the U-shaped groove mold (4), transporting and installing the reinforcement cage (20) which is manufactured outside a field by using a rail crane, installing a reinforcement stress meter (14) on the reinforcement cage (20) at a preset position, fixing a data line on a full-length reinforcement (16), arranging the data line in a cable preformed groove (25) on the inner wall of the U-shaped groove mold (4), and extending the end part of the data line out of the structural surface of the concrete strip foundation (5); a support base plate (17) and an anchor bar (18) are arranged at the top of the reinforcement cage (20), and a void displacement monitor (26) is embedded at the top;
step five, sealing the steel bar stress meter (14) and the void displacement monitoring meter (26) and pouring concrete after external protection of the data line to form a strip foundation (5);
step six, repeating the step one to the step five until all the middle elastic foundation beams (2) and the outer elastic foundation beams (3) are constructed;
step seven, drawing one original old sleeper plug from the starting point at intervals of six sleepers, adjusting the distance between adjacent old sleepers, and after finishing, inserting a transverse lifting beam (9) and tamping a track bed;
step (eight), flatly arranging a D24 type temporary beam (6) on an elastic foundation beam crossing a shield area by using a rail crane, flatly arranging a D16 type temporary beam (7) on the elastic foundation beam outside the D24 type temporary beam (6) by using the rail crane in the same way after the D24 type temporary beam (6) is in place, and repeating the step until all longitudinal beam (8) on the middle elastic foundation beam (2) and the outer elastic foundation beam (3) are in place;
step nine, connecting a transverse lifting beam (9) for supporting a track with longitudinal beams (8) at two ends through gusset plates and brackets;
after the D-shaped temporary beam is in place, welding limiting steel plates (24) with support base plates (17) pre-embedded at the upper part of the elastic foundation beam on two sides of a longitudinal beam (8) in the D-shaped temporary beam to prevent the D-shaped temporary beam from moving transversely;
step eleven, determining reference points and monitoring points, connecting all monitor data lines to a control center, and debugging a real-time monitoring system for internal force and displacement of the reinforcing device;
step twelve, performing downward penetration construction of the shield tunnel (19), monitoring in real time and predicting the trend;
and (thirteen) dismantling the D-shaped temporary beam and recovering the normal operation of the railway.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308001.9A CN113832947A (en) | 2021-11-05 | 2021-11-05 | Device and method for reinforcing multiple-track railway with small space passing under shield tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308001.9A CN113832947A (en) | 2021-11-05 | 2021-11-05 | Device and method for reinforcing multiple-track railway with small space passing under shield tunnel |
Publications (1)
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114658003A (en) * | 2022-04-08 | 2022-06-24 | 中铁第五勘察设计院集团有限公司 | Railway high-low staggered platform reinforcing system and construction method |
| CN116906055A (en) * | 2023-09-12 | 2023-10-20 | 中南大学 | Construction method for controlling deformation of tunnel underpass railway bed and shed frame supporting structure |
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2021
- 2021-11-05 CN CN202111308001.9A patent/CN113832947A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114658003A (en) * | 2022-04-08 | 2022-06-24 | 中铁第五勘察设计院集团有限公司 | Railway high-low staggered platform reinforcing system and construction method |
| CN114658003B (en) * | 2022-04-08 | 2023-07-21 | 中铁第五勘察设计院集团有限公司 | Railway high-low staggered platform reinforcing system and construction method |
| CN116906055A (en) * | 2023-09-12 | 2023-10-20 | 中南大学 | Construction method for controlling deformation of tunnel underpass railway bed and shed frame supporting structure |
| CN116906055B (en) * | 2023-09-12 | 2023-11-21 | 中南大学 | Construction method for controlling deformation of tunnel underpass railway bed and shed frame supporting structure |
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