阅读说明：本技术 一种天窗期内完成整体道床沉降快速修复施工方法 (Construction method for completing rapid restoration of settlement of integral ballast bed in skylight period ) 是由 杨明辉 田春香 李粮余 张凯 葛根荣 刘喆丰 刘在庆 曹保 于 2020-06-24 设计创作，主要内容包括：本发明公开了一种天窗期内完成整体道床沉降快速修复施工方法,该修复施工方法用于在天窗期内进行,包括以下步骤：采用调高扣件恢复线位、凿除原长轨枕及周围道床混凝土、铺设新短轨枕、钢筋植入、支立模板以及通过聚合物水泥砂浆进行浇筑。在天窗期内对轨枕进行修复施工,该施工方法通过聚合物水泥砂浆进行浇筑养护形成新的道床结构,实现整体道床沉降的快速恢复,该施工方法现场工程量小,聚合物水泥砂浆可以快速硬化道床,缩短道床修复施工工期,大大减少对运营的影响,通过调高扣件使轨底与道床面之间的间隙增大,使其能够满足工务抢修时安装钢轨急救器的空间需要,缩短了应急处置时间,降低对列车运行和乘客出行的影响。(The invention discloses a rapid repairing construction method for finishing integral ballast bed settlement in a skylight period, which is used for repairing construction in the skylight period and comprises the following steps: the method comprises the steps of restoring linear positions by using a height-adjusting fastener, chiseling off original long sleepers and surrounding track bed concrete, laying new and short sleepers, implanting reinforcing steel bars, erecting templates and pouring by using polymer cement mortar. The sleeper is repaired in the skylight period, the construction method forms a new track bed structure through pouring and maintaining polymer cement mortar, the rapid restoration of the settlement of the whole track bed is realized, the construction method is small in field engineering quantity, the polymer cement mortar can rapidly harden the track bed, the repair construction period of the track bed is shortened, the influence on the operation is greatly reduced, the gap between the rail bottom and the track bed surface is increased through heightening the fastener, the space requirement for installing a steel rail emergency device during the emergency repair of the engineering work can be met, the emergency disposal time is shortened, and the influence on the train operation and the trip of passengers is reduced.)

1. A construction method for completing rapid restoration of integral ballast settlement in a skylight period is characterized in that the construction method carries out construction in the skylight period and comprises the following steps:

the linear position is restored by adopting a height-adjusting fastener (4);

chiseling the original long sleeper (5) and the concrete of the surrounding track bed;

laying a new short sleeper;

implanting steel bars;

erecting a template;

pouring is carried out through polymer cement mortar (3).

2. The construction method for completing the rapid restoration of the integral track bed settlement in the skylight period as claimed in claim 1, wherein said heightening fastener (4) comprises a rail lower backing plate (41), a backing plate (42) and a plate lower heightening backing plate (43), said rail lower backing plate (41) is located at the top of said backing plate (42), and said plate lower heightening backing plate (43) is located at the bottom of said backing plate (42).

3. The construction method for completing the rapid restoration of the integral ballast settlement in the skylight period as claimed in claim 2, wherein in the step of chiseling the original long sleeper (5) and the concrete of the surrounding ballast, the sleeper in the renovation range is taken out from the concrete ballast by adopting the principle of three-in-one chiseling, and the chiseling surface of the ballast is kept rough;

in the range of the chiseled track bed, the bottom of the installed new sleeper has a space of 40-60 mm, and the periphery of the new sleeper has a space of 70-90 mm.

4. The construction method for completing the rapid restoration of the settlement of the whole track bed in the skylight period according to claim 1, wherein in the step of laying new short sleepers, the new short sleepers are scattered and laid at the positions of original sleepers, and when the settlement of the track bed is within 50mm, common sleepers are adopted; when the settlement of the track bed is more than 50mm and less than 100mm, the reinforced sleeper is adopted.

5. The construction method for completing the rapid restoration of the settlement of the integral track bed in the skylight period as claimed in claim 1, wherein after the new short sleeper is laid in the step, the originally designed fastener is installed, and the bolt is tightened to hang the new short sleeper below the steel rail.

6. The construction method for completing the rapid restoration of the integral track bed settlement in the skylight period as claimed in claim 1, wherein before the step of laying the new short sleeper, the method comprises the steps of cleaning up scraps, washing the chiseled surface and removing impurities;

the bed is then painted with an undercoating material in the gouged area.

7. The construction method for completing the rapid restoration of the settlement of the integral track bed in the skylight period according to claim 1, wherein in the step of steel bar implantation, holes are drilled in the track bed at four corners of the sleeper, a first threaded steel bar (1) is implanted, and a second threaded steel bar (2) with an upper layer and a lower layer is arranged on the periphery of the sleeper;

the implanted twisted steel I (1) is firmly bound with the upper and lower layers of twisted steel II (2), the height of the bottom layer of twisted steel II (2) is flush with the height of the sleeper stretching reinforcing steel bar, the upper and lower layers of twisted steel II (2) are welded with the sleeper stretching reinforcing steel bar, the welding length is not less than 60mm, and the height of the welding line is not less than 4 mm.

8. The method for completing the rapid restoration construction of the integral ballast settlement in the skylight period as claimed in claim 1, wherein in the step of erecting the formwork, a formwork line is ejected on the ballast surface, and then the formwork is connected.

9. The construction method for completing the rapid restoration of the settlement of the integral ballast bed in the skylight period according to claim 1, wherein the sundries are cleaned again after the templates are erected in the step;

then, polymer cement mortar (3) is prepared.

10. The construction method for completing the rapid restoration of the integral ballast settlement in the skylight period according to any one of claims 1 to 9, wherein the step is performed by pouring polymer cement mortar (3), the cement mortar naturally flows from one side to the other side of the sleeper when the polymer cement mortar (3) is poured, then the vibration is performed, after the bottom of the filled sleeper is vibrated to be compact, the forward pouring is continued, and the surface of the ballast concrete is subjected to surface plastering treatment;

cleaning the steel rail after the vibration is finished, and maintaining after the pouring is finished;

and after the pouring is finished, repeating the steps according to the principle of cutting three holes by one, until the sleepers in the renovation range are completely repaired.

Technical Field

The invention relates to the field of rail transit, in particular to a construction method for completing rapid restoration of integral ballast bed settlement in a skylight period.

Background

With the continuous improvement of the level of urban modernization in China, the development of a rapid rail transit system becomes a necessary choice for urban public transport construction. However, the geological conditions of various cities are obviously different, and some cities such as Shanghai, Tianjin, Guangzhou, Hangzhou and Ningbo belong to soft soil areas, so that the geological conditions bring challenges to the stability of the tunnel after operation. In recent years, the settlement phenomenon of the subway tunnel in soft soil after operation is increasingly serious due to reasons of liquefaction of a saturated sand soil layer, vibration sinking of saturated clay, softening of granite residual soil and the like caused by uneven settlement of a soil body of a lower layer of the tunnel, adjacent construction influence, ground load and water level change, asynchronous deformation and leakage of the tunnel and a station and vibration excitation of a subway train.

Meanwhile, the connection channel of the shield tunnel constructed in the soft soil stratum is generally constructed by adopting a freezing method, namely, freezing holes which are basically parallel to the direction of the connection channel are arranged along the periphery of an excavated section, and then low-temperature brine is circulated in the freezing holes to freeze the water-containing stratum near the freezing holes to form a frozen soil curtain with high strength and good water sealing property, and the channel is constructed by secretly excavating under the protection of the frozen soil curtain. After the contact channel main structure construction is finished, the cooling is stopped, the soil body is naturally thawed, and the thawing process can cause the settlement of the tunnel near the contact channel. Such settlement is severe at the early stage of operation.

The subway tunnel subsides the in-process and inevitably can lead to the inhomogeneous settlement of circuit, causes the separation of ballast bed and section of jurisdiction to take off from this, the ballast bed fracture, section of jurisdiction damage, and then leads to structure percolating water, track state to worsen, train dynamic load increase etc. will influence the normal use and the driving safety of subway at last. Usually, a small amount of settlement can be repaired through the track bed fastener, and once the settlement exceeds the adjusting capacity of the fastener (the maximum height adjustment is generally 30mm), the track bed may need to be repaired to meet the requirement of track smoothness.

Because the subway is operated, the subway operation can not be interrupted, and the whole track bed settlement treatment construction can only be treated within the time range of the skylight. At present, the method for renovating and repairing the track bed usually adopts the steps of chiseling a sleeper, burying a new sleeve in a drill hole, and pouring cement mortar into a bearing rail table type track bed in situ, or adopts the steps of chiseling the sleeper and a track bed surface, burying a new sleeve in a drill hole, and pouring a sleeper-free track bed by using cement mortar. Its disadvantages are easy breakage and poor durability; the construction quality of the rail bottom slope is not easy to guarantee, so that the abrasion of the steel rail is aggravated; the gap between the rail bottoms is small, and the emergency repair installation of the steel rail emergency treatment device is very difficult when the rail is broken. The existing methods are time-consuming, labor-consuming and large in investment, normal operation of the subway needs to be guaranteed, construction difficulty is high, and construction period is long.

Disclosure of Invention

The invention aims to: aiming at the problems that the table track bed or the sleeper-free track bed of a cast-in-place rail bearing poured by cement mortar in the prior art is easy to damage and poor in durability, the construction quality of a rail bottom slope is not easy to guarantee, the abrasion of a steel rail is aggravated, the gap between the rail bottom is small, and the steel rail emergency treatment device is difficult to mount in emergency repair during rail breakage, the construction method for rapidly repairing the settlement of the whole track bed in a skylight period is provided.

In order to achieve the purpose, the invention adopts the technical scheme that:

a rapid repairing construction method for finishing integral ballast bed settlement in a skylight period is used for being carried out in the skylight period and comprises the following steps:

restoring the linear position by adopting a height-adjusting fastener;

chiseling the original long sleeper and the concrete of the surrounding track bed;

laying a new short sleeper;

implanting steel bars;

erecting a template;

pouring is performed by polymer cement mortar.

By the method, the sleeper is repaired in the skylight period, the construction method forms a new track bed structure through pouring and maintaining polymer cement mortar, the rapid restoration of the settlement of the whole track bed is realized, the construction method is small in field engineering quantity, the polymer cement mortar can rapidly harden the track bed, the repair construction period of the track bed is shortened, the influence on operation is greatly reduced, the gap between the rail bottom and the track bed surface is increased by heightening the fasteners, the space requirement for installing a steel rail emergency device during the emergency repair of work can be met, the emergency disposal time is shortened, and the influence on the operation of a train and the trip of passengers is reduced;

the method can ensure the construction quality of the rail bearing platform and the rail bottom slope, has good durability, and has the advantages of simple construction process, strong operability, convenient material purchase, simple mechanical equipment, high construction efficiency and good technical advantages and economic benefits compared with other ballast bed settlement repairing construction methods.

The skylight period in the present invention is typically 23: 40-4: and 40, dividing the skylight period into a first stage, a second stage, a third stage, a fourth stage and a fifth stage according to the actual condition of the construction site, and determining the construction steps required to be carried out in each stage according to the actual condition of the construction site.

As a preferred scheme of the invention, the height-adjusting fastener comprises a rail lower backing plate, a backing plate and a plate lower height-adjusting backing plate, wherein the rail lower backing plate is positioned at the top of the backing plate, and the plate lower height-adjusting backing plate is positioned at the bottom of the backing plate. Through the structure, the rail is heightened by 0-10mm by the rail lower backing plate, the rail is heightened by 0-60mm by the backing plate, and the rail is heightened by 0-30mm by the plate lower heightening backing plate.

As a preferred scheme of the invention, in the step of chiseling the original long sleeper and the concrete of the surrounding track bed, the sleeper in the renovation range is taken out from the concrete track bed by adopting the principle of dividing three parts by one part, and the chiseling surface of the track bed is kept rough;

in the range of the chiseled track bed, the bottom of the new sleeper has a space of 40mm-60mm, and the periphery of the new sleeper has a space of 70-90 mm.

As the preferred scheme of the invention, the new short sleepers are paved in the step of paving the new short sleepers, the new short sleepers are scattered and paved at the position of the original sleepers, and the common sleepers are adopted when the settlement of the track bed is within 50 mm; when the settlement of the track bed is more than 50mm and less than 100mm, the reinforced sleeper is adopted. Through the steps, the connection strength of the sleeper and the track bed can be enhanced by roughening the periphery of the common sleeper, and the durability is improved.

As a preferred scheme of the invention, after the new short sleeper is laid in the step, the originally designed fastener is installed, and the bolt is screwed down, so that the new short sleeper is suspended below the steel rail.

The originally designed fastener in the invention refers to a common fastener in the prior art.

As a preferred scheme of the invention, before the step of laying a new short sleeper, the method cleans the scraps, washes the chiseled surface and removes impurities;

the bed is then painted with an undercoating material in the gouged area.

As a preferred scheme of the invention, the steps of implanting the steel bars into a track bed at four corners of a sleeper, drilling holes in the track bed, implanting a first threaded steel bar, and arranging an upper layer and a lower layer of second threaded steel bars on the periphery of the sleeper;

the implanted first twisted steel is firmly bound with the upper and lower two layers of twisted steel, the bottom layer of twisted steel is flush with the height of the steel bar stretched out from the sleeper, the upper and lower two layers of twisted steel are welded with the steel bar stretched out from the sleeper, the welding length is not less than 60mm, and the height of the welding line is not less than 4 mm.

As a preferable aspect of the present invention, in the step of erecting the template, a template line is ejected on the road bed surface, and then the template is attached.

As a preferred scheme of the invention, after the step of erecting the template is completed, sundries are cleaned again;

then preparing polymer cement mortar.

As a preferred scheme of the invention, the steps are in pouring through polymer cement mortar, when pouring the polymer cement mortar, the cement mortar flows naturally from one side of the sleeper to the other side, then the vibration is carried out, after the bottom of the filled sleeper is vibrated to be compact, the forward pouring is continued, and the surface of the concrete of the track bed is subjected to plastering treatment;

cleaning the steel rail after the vibration is finished, and maintaining after the pouring is finished;

and after the pouring is finished, repeating the steps according to the principle of cutting three holes by one, until the sleepers in the renovation range are completely repaired.

In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:

1. the sleeper is repaired in a skylight period, the construction method forms a new track bed structure through pouring and curing polymer cement mortar, the rapid restoration of the settlement of the whole track bed is realized, the construction method has small field engineering amount, the polymer cement mortar can rapidly harden the track bed, the repair construction period of the track bed is shortened, the influence on the operation is greatly reduced, the gap between the rail bottom and the track bed surface is increased through heightening the fastener, the space requirement for installing a steel rail emergency device during the emergency repair of the engineering work can be met, the emergency disposal time is shortened, and the influence on the train operation and the trip of passengers is reduced;

the method can ensure the construction quality of the rail bearing platform and the rail bottom slope, has good durability, and has the advantages of simple construction process, strong operability, convenient material purchase, simple mechanical equipment, high construction efficiency and good technical advantages and economic benefits compared with other ballast bed settlement repairing construction methods.

Drawings

FIG. 1 is a flow chart of a construction method for completing rapid restoration of monolithic roadbed settlement in a skylight period according to the invention.

Figure 2 is a schematic structural view of a repaired track bed structure according to the present invention.

Fig. 3 is a partially enlarged view of the area a in fig. 2.

Figure 4 is a schematic plan view of the monolithic track bed structure of the present invention.

Fig. 5 is a schematic structural view of the height-adjusting fastener of the present invention.

Icon: 1-twisted steel bar I; 2-twisted steel bar II; 3-polymer cement mortar; 4-heightening fasteners; 41-rail lower backing plate; 42-a backing plate; 43-raising the base plate under the plate; 5-original long sleeper.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings.

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.