CN111350106A - Railway track temporary supporting structure and construction method thereof - Google Patents
Railway track temporary supporting structure and construction method thereof Download PDFInfo
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- CN111350106A CN111350106A CN202010224853.9A CN202010224853A CN111350106A CN 111350106 A CN111350106 A CN 111350106A CN 202010224853 A CN202010224853 A CN 202010224853A CN 111350106 A CN111350106 A CN 111350106A
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B37/00—Making, maintaining, renewing, or taking-up the ballastway or the track, not provided for in a single one of groups E01B27/00 - E01B35/00
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Abstract
The invention discloses a temporary supporting structure for a railway track, which comprises a plurality of fulcrum piles, wherein the fulcrum piles are vertically arranged between an existing railway track and a newly-built tunnel, and are uniformly arranged at intervals along the existing railway track; the longitudinal support beams are horizontally arranged at the upper parts of the fulcrum piles and are arranged in parallel along the direction of the existing railway track; a transverse supporting beam is arranged at the intersection point of the fulcrum pile and the longitudinal supporting beam and is arranged between the fulcrum pile and the longitudinal supporting beam; a plurality of transverse distribution beams are arranged between every two adjacent transverse support beams; the invention utilizes the combination of the fulcrum piles, the longitudinal supporting beams, the transverse supporting beams and the transverse distribution beams to form an overhead stress structure; the load of the existing railway track is transmitted to the overhead stressed structure, the settlement of the existing railway track is effectively reduced, the temporary supporting structure is removed after the newly-built tunnel construction passes through the existing railway track section, favorable construction conditions are provided for the tunnel construction, and the safety, the stability and the durability of the existing railway track are ensured.
Description
Technical Field
The invention belongs to the technical field of shield construction, and particularly relates to a railway track temporary supporting structure and a construction method thereof.
Background
In the past decades, China has seen an unprecedented trend of subway construction, with huge and continuous demands on infrastructure and traffic systems. With the increasing development of infrastructure systems in cities of China, many subway tunnel constructions have to run through existing railway tracks. Because the shield method is widely adopted in the construction of new tunnels, when existing railway tracks are penetrated under a newly-built tunnel, the settlement of the railway tracks is inevitably caused due to the further influence of foundation deformation and soil motion on surrounding structures, and even the safe operation of trains is possibly threatened.
The construction of a new tunnel is a very delicate process, and in order to ensure the safety, stability and durability of the existing line, the temporary support is carried out on the existing operation railway track, and the adverse effect brought by the settlement of the railway track is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a temporary supporting structure for a railway track and a construction method thereof, and aims to solve the technical problem of the settlement of the existing railway track caused by the fact that a newly-built tunnel penetrates through the existing railway track.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention provides a temporary supporting structure of a railway track, which comprises a plurality of fulcrum piles, a longitudinal supporting beam, a transverse supporting beam and a transverse distribution beam, wherein the fulcrum piles are vertically arranged in the upper covering layer of a newly-built tunnel in parallel and are positioned below the existing railway track; the fulcrum piles are uniformly arranged at intervals along an ascending line, a descending line and a central axis of the existing railway track; the longitudinal support beams are horizontally arranged at the upper parts of the fulcrum piles and are arranged in parallel along the direction of the existing railway track;
the system comprises a plurality of fulcrum piles, a longitudinal support beam, a plurality of fulcrum piles, a plurality of longitudinal support beams and a plurality of supporting columns, wherein the fulcrum piles are connected together along the lower part of an upper line of the existing railway track by the aid of the longitudinal support beam;
a transverse supporting beam is arranged at the intersection point of the fulcrum pile and the longitudinal supporting beam, is fixedly arranged between the fulcrum pile and the longitudinal supporting beam and is vertical to the existing railway track; a plurality of transverse distribution beams are arranged between every two adjacent transverse supporting beams and are uniformly and fixedly arranged below the longitudinal supporting beams.
Further, sleepers are fully paved between the transverse support beams and the fulcrum piles; the upper end of the sleeper is connected with the transverse supporting beam, and the lower end of the sleeper is connected with the pile top of the fulcrum pile.
Furthermore, the transverse supporting beams and the longitudinal supporting beams are connected through U-shaped bolt hoops, and the transverse distribution beams and the longitudinal supporting beams are connected through U-shaped bolt hoops.
Furthermore, the fulcrum pile is formed by digging holes in a quick-drying cement concrete protecting wall.
Furthermore, a cap beam is arranged on the top of the fulcrum pile, and the elevation of the cap beam top is lower than the elevation of the embankment surface of the existing railway track.
Furthermore, the transverse supporting beams and the transverse distribution beams are insulated from the existing railway tracks.
The invention also provides a construction method of the railway track temporary supporting structure, which comprises the following steps:
step 4, uniformly arranging a plurality of transverse distribution beams between two adjacent transverse support beams, and fixedly connecting the transverse distribution beams with the longitudinal support beams;
and 5, after the newly built tunnel construction penetrates through the section of the existing railway track, removing the temporary supporting device and recovering the original appearance of the existing railway track.
Further, in the step 1, before the construction of the pivot piles, grouting reinforcement treatment is carried out on the upper railway subgrade of the newly-built tunnel penetrating through the range of the existing railway track;
the grouting reinforcement parameters are specifically as follows: grouting reinforcement is carried out on the roadbed of the existing railway track by adopting a perforated pipe, grouting drill holes are arranged on two sides of the existing railway track in a quincunx shape, the positions of the grouting drill holes form 90 degrees with each other, and grouting materials adopt cement-water glass double-liquid slurry.
Further, in step 5, when the temporary supporting structure is removed, the transverse distribution beams are firstly removed, then the longitudinal supporting beams are removed, and finally the transverse supporting beams are removed.
Further, in the step 5, in the original appearance recovery process of the existing railway track, the gap between the rail bottom of the existing railway track and the embankment, which is caused by temporary support, is backfilled by adopting a filler, so that the load of the existing railway track is born by the upper covering layer of the newly-built tunnel.
Compared with the prior art, the invention has the beneficial effects that:
the invention provides a temporary supporting structure of a railway track, which utilizes a fulcrum pile, a longitudinal supporting beam, a transverse supporting beam and a transverse distribution beam to form an overhead stress structure; the supporting point pile is used for bearing the load of an upper part component, the longitudinal supporting beam is used as a longitudinal supporting component, the transverse supporting beam vertical to the axis of the railway track and the transverse distribution beam are used as transverse supporting components, the existing railway track and the upper load are transmitted to the overhead stress structure, the load transmitted from the upper part is transmitted to the supporting point pile completely and borne by a covering layer around the supporting point pile, the stability is good, the soil body settlement caused by the extrusion of the load on the existing railway track when a train passes through is effectively reduced, the temporary supporting structure is removed after the newly-built tunnel construction passes through the existing railway track section, favorable construction conditions are provided for the newly-built tunnel construction to pass through the existing railway track line, and meanwhile, the safety, the stability and the durability of the existing railway track are guaranteed.
Furthermore, a sleeper is arranged at the pile top of the fulcrum pile, has certain flexibility and elasticity, can be properly deformed to buffer pressure when a train passes by, and then transmits the huge pressure transmitted from the upper part to the fulcrum pile; due to the good toughness of the sleeper, the train can be well restored to the original shape after passing.
Furthermore, the transverse supporting beams or the transverse distribution beams are connected with the longitudinal supporting beams by U-shaped bolt hoops, so that the load applied to the transverse distribution beams when a train passes through can be effectively transferred to the longitudinal supporting beams, then transferred to the transverse supporting beams by the longitudinal supporting beams, and finally all the load on the upper part is borne by the fulcrum piles; the load when the train passes through can be effectively transmitted to the longitudinal supporting beam through the transverse distribution beam, the phenomenon that the transverse distribution beam excessively sinks after bearing the load and cannot achieve the temporary supporting effect of the railway track is avoided, the structural stability is improved, and the effective transmission of the load is ensured.
Furthermore, the supporting point pile is formed by manually digging holes on the retaining wall, the pile forming mode is convenient to construct, the speed is high, the manufacturing cost is relatively saved, the working surface of construction beside the railway track is limited, and the construction requirements can be met by manually digging holes on the retaining wall without large-scale mechanical equipment.
Furthermore, the cap beam is arranged on the fulcrum pile and is an important component for bearing the upper part and the lower part, and the upper load is transmitted to the fulcrum pile through the cap beam, so that the stress of the fulcrum pile is more uniform, and the stability of the whole supporting structure is enhanced.
Furthermore, as the railway track is used as a signal return line, the transverse supporting beams and the transverse distribution beams are insulated from the existing railway track, stray current interference is effectively prevented, the influence of the strut structure on the running of the train on the existing railway track is reduced, and the normal running of the train on the existing railway track is ensured.
The invention also provides a construction method of the temporary supporting structure of the railway track, which has small construction difficulty and does not need large-scale mechanical equipment in the construction process; the cost is low, the supporting structure can be disassembled after the shield passes through the railway track, and the used materials can be recycled; the influence on railway operation is small, and railway transportation shifts or railway lines are not required to be limited; the structure is stable, the formed overhead stress structure can effectively support the railway track, and the effect of reducing soil body settlement is good.
Furthermore, the consolidation stability of the roadbed is improved by grouting and reinforcing the upper railway roadbed in the range of the newly-built tunnel penetrating through the existing railway track, the grouting and reinforcing are realized by uniformly injecting cement-water glass double-liquid slurry into a soil layer to enable the slurry to enter a cavity or a crack formed by the damaged roadbed soil body structure and be filled by the grouting and reinforcing machine, and the rock soil can be cemented into a whole after being hardened, so that the load transfer performance can be improved, the railway roadbed is reinforced, and the settlement is reduced.
Furthermore, the gap between the bottom of the existing railway track and the embankment caused by temporary support is backfilled by adopting the filler, so that the load of the existing railway track is borne by the overlying soil body after the temporary support structure is removed, and the safety, stability and durability of the existing railway track are ensured.
The temporary supporting structure for the railway track and the construction method thereof provide temporary supporting for the existing railway track to pass downwards, and effectively prevent the over-limit of the horizontal displacement difference or the over-limit of the height difference of the railway track caused by the settlement of the covering layer on the upper part in the construction process of a newly-built tunnel; the existing railway track level difference exceeds the limit, so that the vehicle is easy to shake, the stress of two tracks is uneven, the railway track is uneven and abraded, and derailment accidents can happen in severe cases; the rail irregularity can be further enlarged if the front and rear height difference of the railway rail exceeds the limit, the damage of the locomotive to the rail is aggravated, and a vicious circle is formed; the railway track temporary supporting structure provides safety guarantee for an operated railway, provides favorable conditions for a newly-built tunnel shield to penetrate through an existing line, accelerates the construction progress and creates economic benefits.
Drawings
Fig. 1 is a longitudinal sectional view of a temporary support structure for railway rails according to the present invention;
fig. 2 is a schematic plan view of a temporary support structure for a railway track according to the present invention;
fig. 3 is a flow chart of a construction process of the temporary supporting structure of the railway track.
The method comprises the following steps of 1 fulcrum pile, 2 longitudinal supporting beams, 3 transverse supporting beams, 4 transverse distribution beams, 5U-shaped bolt hoops, 6 sleepers and 7 newly-built tunnels.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating embodiments of the invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1-3, the invention provides a temporary supporting structure for a railway track, which is arranged between a newly-built tunnel 7 and an existing railway track passing through the newly-built tunnel, and comprises a plurality of fulcrum piles 1, three longitudinal supporting beams 2, transverse supporting beams 3, transverse distribution beams 4, U-shaped bolt hoops 5 and sleepers 6.
The pivot piles 1 are vertically arranged in parallel in an upper covering layer of the newly-built tunnel 7 and are positioned below the existing railway track; the fulcrum piles 1 are uniformly arranged at intervals along an ascending line, a descending line and a central axis of the existing railway track; three longitudinal support beams 2 are horizontally arranged at the upper part of the fulcrum pile 1 and are arranged in parallel along the direction of the existing railway track.
Wherein, a plurality of fulcrum stake 1 that first longitudinal support beam 2 will follow the existing railway track upward line below links together, and a plurality of fulcrum stake 1 that second longitudinal support beam 2 will follow the existing railway track downslope below links together, and a plurality of fulcrum stake 1 that third longitudinal support beam 2 will follow the existing railway track axis below links together.
The fulcrum pile 1 is formed by digging holes in a quick-drying cement concrete retaining wall, a cap beam is arranged at the pile top of the fulcrum pile 1, and the elevation of the cap beam top is lower than the elevation of the embankment face of the existing railway track.
A transverse supporting beam 3 is arranged at the intersection point of the fulcrum pile 1 and the longitudinal supporting beam 2, and the transverse supporting beam 3 is fixedly arranged between the fulcrum pile 1 and the longitudinal supporting beam 2 and is vertical to the existing railway track; the transverse supporting beam 3 and the longitudinal supporting beam 2 are connected by a U-shaped bolt hoop 5; and sleepers 6 are fully paved between the transverse supporting beams 3 and the fulcrum piles 1, the upper ends of the sleepers 6 are connected with the transverse supporting beams 3, and the lower ends of the sleepers 6 are connected with the pile tops of the fulcrum piles 1.
A plurality of transverse distribution beams 4 are arranged between every two adjacent transverse supporting beams 3, the transverse distribution beams 4 are uniformly and fixedly arranged below the longitudinal supporting beam 2, and the transverse distribution beams 4 are connected with the longitudinal supporting beam 2 by U-shaped bolt hoops 5; the transverse supporting beams 3 and the transverse distribution beams 4 are insulated from the existing railway tracks.
The invention also provides a construction method of the railway track temporary supporting structure, which comprises the following steps:
And 2, erecting a transverse support beam 3 above the fulcrum pile 1 in the direction vertical to the axis of the existing railway track.
And 3, erecting longitudinal support beams 2 above the transverse support beams 3 along the axial direction of the existing railway track.
And 4, uniformly arranging a plurality of transverse distribution beams 4 between two adjacent transverse support beams 2, and fixedly connecting the transverse distribution beams 4 with the longitudinal support beams 2.
Step 5, after the newly built tunnel 7 is constructed to pass through the section of the existing railway track, the temporary supporting structure is removed, and the original appearance of the existing railway track is recovered; when the temporary supporting structure is dismantled, firstly dismantling the transverse distribution beam 4, then the longitudinal supporting beam 2 and finally the transverse supporting beam 3; in the original appearance recovery process of the existing railway track, the gap between the rail bottom of the existing railway track and the embankment caused by temporary support is backfilled by adopting filler, so that the load of the existing railway track is born by the upper covering layer of the newly-built tunnel 7.
Examples
The embodiment provides a railway track temporary supporting structure and a construction method thereof, which are used for temporarily supporting and reinforcing the existing railway track when a new tunnel penetrates through the existing railway track, so that the settlement of the existing railway track caused by shield construction of the new tunnel is reduced, and the safe operation of the railway track is ensured.
When a shield machine passes through an existing railway in the construction process of a newly-built tunnel, the relative stability of a soil layer is easily damaged, great surrounding rock disturbance is caused, an excavation face is unstable, and construction problems such as roof fall and the like easily occur, so that the ground is excessively settled, the construction is damaged, and the safety of railway operation is influenced; by adopting the temporary supporting method and combining the grouting process, railway track settlement caused by soil body settlement can be greatly reduced, and the existing railway track is well protected.
In this embodiment, when the newly-built shield tunnel penetrates through the existing railway track at an included angle of 45 degrees, the soil covering from the top of the tunnel to the roadbed of the existing railway track is about 6m, and the soil covering to the railway track is about 13 m. The pebble stratum passed by the tunnel shield is low in compressibility and strong in water permeability, surrounding rocks are easy to collapse, large collapse can occur when the surrounding rocks are not properly treated, the side walls of the surrounding rocks are often small collapse, and the ground surface is easy to sink or collapse to the ground surface when the surrounding rocks are shallowly buried; meanwhile, the cable is buried in the slope toe of the roadbed, the adjacent position relations of important facilities are close, the risk of the shield penetrating the railway downwards is high, grouting reinforcement needs to be carried out on the railway roadbed before the shield penetrates downwards, and temporary support measures need to be adopted on the track within the interval influence range.
The temporary supporting structure for the railway track comprises a plurality of fulcrum piles 1, three longitudinal supporting beams 2, transverse supporting beams 3, transverse distribution beams 4, U-shaped bolt hoops 5 and sleepers 6;
the pivot piles 1 are vertically arranged in parallel in an upper covering layer of the newly-built tunnel 7 and are positioned below the existing railway track; the fulcrum piles 1 are uniformly arranged at intervals along an ascending line, a descending line and a central axis of the existing railway track, and the load transmitted from the upper component is born by constructing the fulcrum piles 1 at preset intervals. The fulcrum pile 1 is formed by digging holes in a C35 quick-drying cement concrete retaining wall, the diameter and the length of the fulcrum pile 1 are 1.5m, 5m and 17m in consideration of the geological condition of a newly-built tunnel 7 in a tunneling stratum; the pile top of the fulcrum pile 1 is provided with a cap beam, and the elevation of the cap beam top is lower than the elevation of the embankment surface of the existing railway track.
The three longitudinal support beams 2 are horizontally arranged at the upper part of the fulcrum pile 1 and are arranged in parallel along the direction of the existing railway track; wherein, a plurality of fulcrum piles 1 below the ascending line of the existing railway track are connected together by a first longitudinal supporting beam 2, a plurality of fulcrum piles 1 below the descending line of the existing railway track are connected together by a second longitudinal supporting beam 2, and a plurality of fulcrum piles 1 below the central axis of the existing railway track are connected together by the longitudinal supporting beam 2. The longitudinal support beam 2 is used as a longitudinal bearing member, and two I100I-shaped steel beams are adopted for a single longitudinal support beam 2, wherein the length of the I100I-shaped steel beam is 53 m.
A transverse supporting beam 3 is arranged at the intersection point of the fulcrum pile 1 and the longitudinal supporting beam 2, and the transverse supporting beam 3 is fixedly arranged between the fulcrum pile 1 and the longitudinal supporting beam 2 and is vertical to the existing railway track; and sleepers 6 are fully paved between the transverse supporting beams 3 and the fulcrum piles 1, the upper ends of the sleepers 6 are connected with the transverse supporting beams 3, and the lower ends of the sleepers 6 are connected with the pile tops of the fulcrum piles 1.
A plurality of transverse distribution beams 4 are arranged between every two adjacent transverse support beams 3, and the plurality of transverse distribution beams 4 are uniformly and fixedly arranged below the longitudinal support beam 2; the transverse supporting beams 3 and the transverse distribution beams 4 are insulated from the existing railway tracks.
The single transverse supporting beam 3 is composed of five 3703I-steel beams, the five 3703I-steel beams are welded and fixed together, and the U-shaped bolt hoop 5 is adopted to be fixedly connected with the longitudinal supporting beam 2; the single transverse distribution beam 4 is made of a single 3703I-steel, the single 3703I-steel is fixedly connected with the longitudinal support beam 2 through a U-shaped bolt hoop 5, and the transverse support beam 3 and the transverse distribution beam 4 are used as transverse bearing members.
The invention relates to a construction method of a temporary supporting structure of a railway track, which comprises the following steps:
adopting steel perforated pipes to carry out grouting reinforcement on a railway roadbed, wherein the steel perforated pipes adopt thin-wall steel pipes with the diameter of 50-60 mm, small holes with different intervals are drilled on the thin-wall steel pipes, the steel perforated pipes are driven or drilled and inserted into an upper covering layer, grouting drill holes are distributed on two sides of an existing railway in a quincunx shape, and the grouting drill hole positions form 90 degrees with each other; and injecting grouting material into the steel perforated pipe by adopting pressure, so that the grouting material enters a cavity or a crack formed by the damaged soil body structure of the railway roadbed through the small hole and is filled by the grouting material, the load transfer performance can be improved, the railway roadbed is reinforced, and the settlement is reduced. The grouting pressure is 0.2-0.4MPa, the grouting material adopts 1:1 cement-water glass double-liquid slurry, cement and water glass solution are alternately injected into the railway roadbed, the two solutions react rapidly to play a role in cementing and filling pores, so that the strength and the bearing capacity of the railway roadbed are improved; the double-liquid grouting is adopted, the defects that the single-liquid cement slurry is long in setting time and difficult to control, the calculus rate is low under the condition of flowing water and the like are overcome, the grouting reinforcement effect is improved, the cement grouting range is expanded, the application range is wide, and the double-liquid grouting method can be used for various soil layers. The steel perforated pipe grouting reinforcement range is 20m outside the two sides of the section of the newly-built tunnel passing through the existing railway track.
And arranging inspection holes after grouting is finished, wherein the number of the inspection holes is not less than 5-10% of the total number of grouting drilled holes, the whole grouting range can be covered, coring is carried out to observe the grout filling condition, and the grout filling rate is not less than 85%.
And 2, when the newly-built tunnel shield construction needs to pass through the lower part of the existing railway, fulcrum piles with preset intervals are constructed on the two sides of the ascending line and the descending line of the existing railway track and on the central axis, and the fulcrum piles are used for bearing the load transmitted from the upper component.
The fulcrum pile adopts C35 quick-drying cement concrete dado hole digging pile forming, the dado thickness is 0.15m, the diameter of the digging hole is 1.5m, a water drainage hole is reserved in the dado of the permeable layer section for facilitating the drainage of the organization in the hole, which is beneficial to the drainage of a connecting pipe and is blocked before the concrete is poured, and if the water inflow is large in the confined water of the diving layer, cement mortar is adopted to press and fill the pebble ring to seal the diving layer; according to geological conditions, the length of the fulcrum piles is set to be 5m and 17m, the fulcrum piles are driven into the bearing layer, and the distance between every two adjacent fulcrum piles in the existing railway track direction is not more than 15 m.
Step 4, erecting a longitudinal support beam above the transverse support beam along the axial direction of the existing railway track, wherein the longitudinal support beam is used as a longitudinal bearing member and can transfer the upper load to the fulcrum pile and then to the soil body through the fulcrum pile so as to meet the supporting construction requirement; the single longitudinal supporting beam adopts two I100 steel beams, the length of the longitudinal supporting beam is 53m, and when the upper load of the existing railway track is large, the reinforcing length of the longitudinal supporting beam is increased by a proper amount; the transverse supporting beam and the longitudinal supporting beam are fixedly connected by the U-shaped bolt hoop, so that the transverse supporting beam and the longitudinal supporting beam are reliably connected, and the upper load is effectively transferred between the transverse supporting beam and the longitudinal supporting beam.
Step 5, uniformly arranging a plurality of transverse distribution beams between two adjacent transverse support beams, wherein a single 3703I-steel is adopted for a single transverse distribution beam; the transverse distribution beam and the longitudinal support beam are fixedly connected through the U-shaped bolt hoop, the transverse distribution beam and the transverse support beam are jointly used as a transverse bearing component, and the U-shaped bolt hoop and the longitudinal support beam are fixedly connected, so that the load when a train passes through can be effectively transmitted to the longitudinal support beam through the transverse distribution beam, the phenomenon that the transverse distribution beam excessively sinks after bearing the load is avoided, the temporary support effect of the railway track cannot be achieved, the structural stability is improved, and the effective transmission of the load is ensured.
When the transverse distribution beams are erected, after manual excavation is carried out on the rail bottom of the existing railway track, the transverse distribution beams are placed at preset positions, and the distance between every two adjacent transverse distribution beams is 0.6 m; the manual excavation is adopted, the disturbance to the soil body is effectively reduced, and the good effect of supporting the rail bottom of the railway track is realized.
The invention relates to a temporary supporting structure of a railway track and a construction method thereof, which are used for solving the problems that when a newly-built tunnel shield penetrating the existing railway track is constructed, the railway track is settled due to soil settlement caused by the soil settlement, and the safety, the stability and the durability of an operated railway are influenced; constructing fulcrum piles with preset intervals at two sides of an up-down line and below a central axis of an existing line to bear loads transmitted by an upper member, erecting longitudinal support beams on the fulcrum piles along the railway direction to serve as longitudinal bearing members, and arranging transverse support beams and transverse distribution beams along the direction vertical to the railway to serve as transverse bearing members; the load of the existing railway in the range of the section passing through the lower section of the section is transmitted to an overhead stressed structure consisting of fulcrum piles, longitudinal supporting beams, transverse supporting beams and transverse distribution beams, so that a temporary supporting system is formed for the existing railway of the section passing through the lower section of the section, all components are removed after tunnel construction passes through a railway track section, the settlement of the existing railway is effectively reduced, favorable conditions are provided for the construction of the subway shield to pass through the existing railway, and the safety, the stability and the durability of the operated railway are ensured.
Although the embodiments of the present invention have been described in detail with reference to the accompanying drawings, the embodiments of the present invention are not limited to the details of the above embodiments, and various simple modifications can be made to the technical solutions of the embodiments of the present invention within the technical idea of the embodiments of the present invention, and the simple modifications all belong to the protection scope of the embodiments of the present invention.
It should be noted that the various features described in the above embodiments may be combined in any suitable manner without departing from the scope of the invention. In order to avoid unnecessary repetition, the embodiments of the present invention do not describe every possible combination.
Claims (10)
1. A railway track temporary supporting structure is characterized by comprising a plurality of fulcrum piles (1), a longitudinal supporting beam (2), a transverse supporting beam (3) and transverse distribution beams (4), wherein the fulcrum piles (1) are vertically arranged in an upper covering layer of a newly-built tunnel (7) in parallel and are positioned below an existing railway track; a plurality of fulcrum piles (1) are uniformly arranged at intervals along an ascending line, a descending line and a central axis of the existing railway track; the longitudinal support beam (2) is horizontally arranged at the upper part of the fulcrum pile (1) and is arranged in parallel along the direction of the existing railway track;
the system comprises a plurality of fulcrum piles (1) below an existing railway track ascending line, a plurality of fulcrum piles (1) below the existing railway track descending line, a longitudinal supporting beam (2), and a longitudinal supporting beam (2), wherein the fulcrum piles (1) below the existing railway track ascending line are connected together;
a transverse supporting beam (3) is arranged at the intersection point of the fulcrum pile (1) and the longitudinal supporting beam (2), and the transverse supporting beam (3) is fixedly arranged between the fulcrum pile (1) and the longitudinal supporting beam (2) and is vertical to the existing railway track; a plurality of transverse distribution beams (4) are arranged between two adjacent transverse supporting beams (3), and the transverse distribution beams (4) are uniformly and fixedly arranged below the longitudinal supporting beam (2).
2. A railway track temporary supporting construction according to claim 1, wherein sleepers (6) are fully laid between the lateral supporting beams (3) and the fulcrum piles (1); the upper end of the sleeper (6) is connected with the transverse supporting beam (3), and the lower end of the sleeper (6) is connected with the pile top of the fulcrum pile (1).
3. A temporary support structure for railway tracks according to claim 1, characterized in that the cross support beams (3) are connected with the longitudinal support beams (2) by U-shaped bolt hoops (5), and the cross distribution beams (4) are connected with the longitudinal support beams (2) by U-shaped bolt hoops (5).
4. A railway track temporary supporting structure according to claim 1, wherein the fulcrum piles (1) are formed by digging holes in quick-drying cement concrete retaining walls.
5. A railway track temporary support structure according to claim 1, wherein the pile top of the fulcrum pile (1) is provided with a cap beam, and the cap beam top has an elevation lower than the level of the embankment face of the existing railway track.
6. A temporary support structure for railway tracks, according to claim 1, characterized in that the transverse supporting beams (3) and the transverse distribution beams (4) are insulated from the existing railway track.
7. A construction method of a temporary supporting structure of a railway track as claimed in any one of claims 1 to 6, comprising the steps of:
step 1, when a newly-built tunnel (7) passes through an existing railway track, constructing a fulcrum pile (1) below an uplink line, a downlink line and a central axis of the existing railway track;
step 2, erecting a transverse support beam (3) above the fulcrum pile (1) in the direction vertical to the axis of the existing railway track;
step 3, erecting a longitudinal support beam (2) above the transverse support beam (3) along the axial direction of the existing railway track;
step 4, uniformly arranging a plurality of transverse distribution beams (4) between two adjacent transverse supporting beams (2), and fixedly connecting the transverse distribution beams (4) with the longitudinal supporting beams (2);
and 5, after the newly built tunnel (7) is constructed to pass through the section of the existing railway track, the temporary supporting device is dismantled, and the original appearance of the existing railway track is restored.
8. The construction method of a temporary supporting structure of a railway track according to claim 7, wherein in the step 1, before the pivot piles (1) are constructed, grouting reinforcement treatment is carried out on the upper railway subgrade of the range of the existing railway track under the newly-built tunnel (7);
the grouting reinforcement parameters are specifically as follows: grouting reinforcement is carried out on the roadbed of the existing railway track by adopting a perforated pipe, grouting drill holes are arranged on two sides of the existing railway track in a quincunx shape, the positions of the grouting drill holes form 90 degrees with each other, and grouting materials adopt cement-water glass double-liquid slurry.
9. A method of constructing a temporary support structure for railway tracks, according to claim 7, wherein in step 5, the temporary support structure is removed by removing the transverse distribution beams (4), then the longitudinal support beams (2), and finally the transverse support beams (3).
10. The construction method of a temporary supporting structure of a railway track according to claim 7, wherein in the step 5, in the original form restoration process of the existing railway track, the gap between the bottom of the existing railway track and the embankment caused by the temporary support is backfilled with filler so that the load of the existing railway track is borne by the upper covering layer of the newly-built tunnel (7).
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| CN202010224853.9A CN111350106A (en) | 2020-03-26 | 2020-03-26 | Railway track temporary supporting structure and construction method thereof |
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