阅读说明：本技术 一种钢弹簧浮置板道床局部改造工艺 (Local transformation process for steel spring floating slab track bed ) 是由 展超群 雷鸣 陈志远 段启楠 赵勇 桂磊 范长林 王尧 于 2021-08-24 设计创作，主要内容包括：本发明提供一种钢弹簧浮置板道床局部改造工艺,首先对现状浮置板系统及其零部件进行更换检修,同时对接触网进行标高调整后解除无缝线路；然后对每块浮置板的隔振器和轨道进行标高测量,计算出需要调整抬升的高度；再通过调高垫板的搭配组合对隔振器和轨道进行抬升；并对抬升后的轨道进行加固并调整轨道状态；然后去除道床改造位置的轨枕混凝土,替换安装预制轨枕及扣件；最后再重新浇注混凝土对道床进行加固。本发明通过该工艺在现有钢弹簧浮置板道床的基础上进行局部改造,实现道床轨面高程的调整,使用预制轨枕替换掉原来无轨枕结构,消除线路现状缺陷,提高轨道设备状态,整体工艺简单,提高了道床高程改造施工效率,保证道床后续的稳定运行。(The invention provides a local transformation process of a steel spring floating slab track bed, which comprises the following steps of firstly, replacing and overhauling a current floating slab system and parts thereof, and removing a seamless line after carrying out elevation adjustment on a contact net; then, carrying out elevation measurement on the vibration isolator and the track of each floating slab, and calculating the height to be adjusted and lifted; lifting the vibration isolator and the track by matching and combining the height adjusting base plates; reinforcing the lifted track and adjusting the track state; removing the sleeper concrete at the track bed reconstruction position, and replacing and installing the prefabricated sleeper and the fastener; and finally, pouring concrete again to reinforce the ballast bed. The invention carries out local transformation on the basis of the prior steel spring floating slab track bed by the process, realizes the adjustment of the track bed rail surface elevation, replaces the prior trackless sleeper structure by the prefabricated sleeper, eliminates the current situation defect of the line, improves the track equipment state, has simple integral process, improves the track bed elevation transformation construction efficiency and ensures the subsequent stable operation of the track bed.)

1. A local transformation process for a steel spring floating slab track bed is characterized by comprising the following steps:

the method comprises the following steps that firstly, a current floating slab system and parts thereof are replaced and maintained, and meanwhile, seamless lines are removed after elevation adjustment is carried out on a contact net;

secondly, carrying out elevation measurement on the vibration isolator and the track of each floating slab, and calculating the height to be adjusted and lifted;

lifting the vibration isolator and the track through the matching combination of the heightening base plates;

step four, reinforcing the lifted track and adjusting the track state;

removing the sleeper concrete at the track bed reconstruction position, and replacing and installing the prefabricated sleeper and the fastener;

and step six, pouring concrete again to reinforce the ballast bed.

2. The local transformation process of the steel spring floating slab track bed according to claim 1, wherein the lifting adjustment of the vibration isolator specifically comprises the following steps:

determining the design elevation of the reconstruction of the ballast bed;

taking the interval of 1-1.2m on the vibration isolator of each floating slab as a measurement reference point and measuring the corresponding height of each reference point;

comparing the measured elevation of each datum point with the designed elevation to calculate the lifting height of the vibration isolator, wherein the lifting height is smaller than the designed elevation, and the difference value is 5-11 mm;

calculating the combination and collocation conditions of the height-adjusting base plates required by each lifting height;

a displacement sensor and a pressure sensor are installed on the vibration isolator;

and the vibration isolators of each floating slab are sequentially lifted and adjusted through the jacks and the height-adjusting base plates.

3. The local transformation process of the steel spring floating slab track bed according to claim 2, wherein in the lifting adjustment, the second floating slab is processed along the slope, so that each vibration isolator is ensured to be in a stressed non-suspended state and to be in smooth transition.

4. The local transformation process of the steel spring floating slab track bed according to claim 1, wherein the lifting adjustment specifically comprises the following steps:

carrying out elevation measurement on the existing rail surface;

comparing the measured elevation of the rail surface with the designed elevation to calculate the lifting height of the rail surface;

the rail surface is lifted by the combination and matching of the heightening base plate.

5. The local transformation process of the steel spring floating slab track bed according to claim 1, wherein the fourth step is realized by the following method:

installing a lengthened anchoring bolt for reinforcement according to the height of the heightening base plate;

installing a temporary steel rail reinforcing device in the height-adjusting section;

after the height of the track is adjusted in place, the bottom slope, the track gauge and the direction of the track are adjusted through the wedge-shaped rubber pad and the track gauge block.

6. The local transformation process of the steel spring floating slab track bed according to claim 1, wherein the step five is realized by the following method:

checking and repairing the sealing property of the sealing rubber strips on the two sides of the chiseled section;

laying a temporary isolation tarpaulin on the upper part of the sealing rubber strip;

chiseling the concrete at the original sleeper of the track bed in a mode of taking one out of three, and adjusting the existing transverse steel bars in the track bed to be adaptive to the prefabricated sleeper;

cleaning waste residues in the pit, coating an interface agent, and replacing and installing a prefabricated sleeper and a fastener;

and detecting and confirming the geometric state of the line to ensure that the geometric state of the line is within an allowable deviation range.

Technical Field

The invention relates to the technical field of rail transit construction, in particular to a local transformation process of a steel spring floating slab track bed.

Background

The direct-buried fastener steel spring floating plate vibration reduction ballast bed engineering is used for solving the problems of damage of vibration and noise to the environment and influence of resident life in rail transit.

In specific use, the damping track bed of the direct-buried fastener steel spring floating plate can be seriously damaged after long-time operation, for example: the general inefficacy of bullet strip, anchor bolt inefficacy and compressive resistance are not enough, iron backing plate lower part is unsmooth, backing plate fracture, the broken, the fracture of floating slab shear hinge etc. of railway roadbed for the track is difficult to keep the needs of normal operating, and the rail appears examining transfinites, produces great hidden danger to operation safety, consequently, need to carry out local transformation to the floating slab of long-time operation.

Through relevant tests and expert review, the original direct-buried fastener is replaced by the prefabricated sleeper and the DTIII2-B type fastener, and the floating plate operated for a long time is reconstructed and repaired. Prefabricated sleeper can be connected with former railway roadbed reinforcing bar, but the sleeper produces the conflict and the long-time operation in tunnel with former railway roadbed reinforcing bar position has produced inhomogeneous settlement, and current situation floating slab railway roadbed rail surface elevation differs great with the design rail surface elevation of transformation, needs to carry out the lifting transformation to the floating slab height to eliminate track equipment defect, improve the track state, eliminate the operation hidden danger.

Disclosure of Invention

The invention aims to provide a local transformation process of a steel spring floating slab track bed, which aims to solve the problems in the background technology and ensure safe operation in the high-altitude transformation of the floating slab track bed.

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

a local transformation process for a steel spring floating slab track bed comprises the following steps:

the method comprises the following steps that firstly, a current floating slab system and parts thereof are replaced and maintained, and meanwhile, seamless lines are removed after elevation adjustment is carried out on a contact net;

secondly, carrying out elevation measurement on the vibration isolator and the track of each floating slab, and calculating the height to be adjusted and lifted;

lifting the vibration isolator and the track through the matching combination of the heightening base plates;

step four, reinforcing the lifted track and adjusting the track state;

removing the sleeper concrete at the track bed reconstruction position, and replacing and installing the prefabricated sleeper and the fastener;

and step six, pouring concrete again to reinforce the ballast bed.

Further, the lifting adjustment of the vibration isolator specifically comprises the following steps:

determining the design elevation of the reconstruction of the ballast bed;

taking the interval of 1-1.2m on the vibration isolator of each floating slab as a measurement reference point and measuring the corresponding height of each reference point;

comparing the measured elevation of each datum point with the designed elevation to calculate the lifting height of the vibration isolator, wherein the lifting height is smaller than the designed elevation, and the difference value is 5-11 mm;

calculating the combination and collocation conditions of the height-adjusting base plates required by each lifting height;

a displacement sensor and a pressure sensor are installed on the vibration isolator;

and the vibration isolators of each floating slab are sequentially lifted and adjusted through the jacks and the height-adjusting base plates.

Preferably, in the lifting adjustment, the second floating plate is processed in a downslope mode, and each vibration isolator is guaranteed to be in a stressed non-suspension state and to be in smooth transition.

Further, the lifting adjustment of the vibration isolator specifically comprises the following steps:

carrying out elevation measurement on the existing rail surface;

comparing the measured elevation of the rail surface with the designed elevation to calculate the lifting height of the rail surface;

the rail surface is lifted by the combination and matching of the heightening base plate.

Further, the fourth step is specifically realized by the following method:

installing a lengthened anchoring bolt for reinforcement according to the height of the heightening base plate;

installing a temporary steel rail reinforcing device in the height-adjusting section;

after the height of the track is adjusted in place, the bottom slope, the track gauge and the direction of the track are adjusted through the wedge-shaped rubber pad and the track gauge block.

Further, the fifth step is specifically realized by the following method:

checking and repairing the sealing property of the sealing rubber strips on the two sides of the chiseled section;

laying a temporary isolation tarpaulin on the upper part of the sealing rubber strip;

chiseling the concrete at the original sleeper of the track bed in a mode of taking one out of three, and adjusting the existing transverse steel bars in the track bed to be adaptive to the prefabricated sleeper;

cleaning waste residues in the pit, coating an interface agent, and replacing and installing a prefabricated sleeper and a fastener;

and detecting and confirming the geometric state of the line to ensure that the geometric state of the line is within an allowable deviation range.

According to the technical scheme, the local transformation is carried out on the basis of the conventional steel spring floating slab track bed through the process, the height of the track bed rail surface is adjusted, the original sleeper-free structure is replaced by the prefabricated sleeper, the current situation defect of the line is overcome, the track equipment state is improved, the overall process is simple, the elevation transformation construction efficiency of the track bed is improved, and the subsequent stable operation of the track bed is ensured.

Drawings

FIG. 1 is a schematic flow chart of the steps of the present invention;

Detailed Description

A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The local transformation process of the steel spring floating slab track bed shown in figure 1 specifically comprises the following steps:

s1, replacing and overhauling the current floating plate system and parts thereof, and removing the seamless line after the elevation adjustment of the contact net is carried out;

s2, carrying out elevation measurement on the vibration isolator and the track of each floating slab, and calculating the height to be adjusted;

s3, lifting the vibration isolator and the track through the matching combination of the heightening base plates;

specifically, the lifting adjustment of the vibration isolator specifically comprises the following steps: firstly, determining the design elevation of the track bed reconstruction; then, taking the interval of 1-1.2m on the vibration isolator of each floating slab as a measurement reference point and measuring the corresponding height of each reference point; then comparing the measured elevation of each datum point with the designed elevation to calculate the lifting height of the vibration isolator, wherein the lifting height is smaller than the designed elevation, and the difference value is 5-11 mm; calculating the combination and collocation conditions of the height-adjusting base plates required by each lifting height; then a displacement sensor and a pressure sensor are installed on the vibration isolator; and then the vibration isolators of each floating plate are sequentially lifted and adjusted through the jack and the height-adjusting base plate, and it needs to be noted that in order to ensure safe operation, the lifting adjustment is carried out in a down-slope treatment from the second floating plate, so that each vibration isolator is ensured to be in a stress non-suspension state and smooth transition.

The lifting adjustment of the vibration isolator is similar to that of the vibration isolator, and the lifting height of the rail surface is calculated by comparing the measured elevation of the rail surface with the designed elevation after the elevation of the existing rail surface is measured; then the rail surface is lifted by the combination and the overlapping of the heightened base plate.

The heightening base plate comprises a heightening steel plate and an elastic plastic plate, wherein the heightening steel plate with the thickness of 40mm and 30mm and the elastic plastic plate with the thickness of 10mm, 5mm and 2mm are adopted at the heightening end, and the heightening steel plate with the thickness of 40mm, 30mm and 10mm and the elastic plastic plate with the thickness of 10mm, 5mm and 2mm are adopted at the down slope section

S4, reinforcing the lifted track and adjusting the track state;

need carry out interim reinforcement after the rail face is increaseed, fix a position earlier through the nylon sleeve pipe and install long anchor bolt and constitute interim fixing device, during the installation nylon sleeve pipe, utilize drilling machine drilling, with downthehole residue and water clean up, adopt special gluey rifle to pour into the bar planting and glue, for guaranteeing nylon sleeve pipe anchor quality, the bar planting glue should fill before the initial set and finish. Considering that the glue injection amount is large, in order to prevent the large-volume glue body from curing with large heat and accelerating the initial setting process, the whole glue injection process is completed within 3 minutes. The glue injection is made to sink to the bottom of the hole as much as possible, air cavities are prevented from remaining in the middle, the glue is injected to a position slightly exceeding the 2/3 position of the hole body, then the nylon sleeve is pressed and implanted, in order to ensure that the periphery of the nylon sleeve is uniformly distributed with the glue, the nylon sleeve is slowly pressed to the bottom by rotating 3-5 circles clockwise (anticlockwise), and the top surface of the nylon sleeve is made to be flush with the top surface of the sleeper.

The specification of long anchor bolt is by the concrete lifting height decision of track, and the lifting height is less than 15mm and chooses for use length for 152 mm's long anchor bolt, and the lifting height is located to choose for use length for 173 mm's long anchor bolt between 15mm to 30mm, and the lifting height is located to choose for use length for 192 mm's long anchor bolt between 30mm to 50mm, and when the lifting height exceeded 45mm, 1 long anchor bolt of every 6.25m installation, 1 long anchor bolt of every 12.5m installation when increaseing and being less than 45 mm.

The adjustment of the track state in the preferred embodiment mainly comprises the adjustment of a track bottom slope, a track gauge and a track direction, specifically, the track bottom slope is realized by replacing wedge-shaped rubber pads with different specifications, and in order to ensure that the elevation of a track surface reaches a better state, a 2mm and 3mm track lower elevation base plate is matched to be used; after the rail bottom slope is adjusted, rechecking whether the rail bottom slope reaches the standard by using a rail bottom slope measuring instrument, wherein the adjustment error range of the rail bottom slope is 1/50-1/30; track gauge adjustment and track direction adjustment are realized by replacing a non-standard track gauge block, a measurement person issues an adjustment amount delivery table before adjustment, and the measurement person needs to recheck the adjustment completion condition after adjustment is completed;

s5, removing the sleeper concrete at the track bed reconstruction position, and replacing and installing the prefabricated sleeper and the fastener;

before the roadbed is chiseled, the sealing rubber strips on two sides of the chiseled section are subjected to sealing performance inspection, poor sealing performance is treated, temporary isolation tarpaulin is laid on the upper portions of the sealing rubber strips to prevent concrete slag from entering the bottom of the roadbed during chiseling, the slag falling on the isolation tarpaulin is timely cleaned during chiseling, the chiseling speed is reduced when the slag is chiseled to the peripheral position of the vibration isolator, and a handheld small electric drill is timely replaced to break the slag so as to enhance the protection of the vibration isolator;

in specific construction, chiseling of an original railway bed fixing mechanism is carried out in a mode of taking one out of three at intervals, namely, concrete is chiseled by adopting an electric pick for every three sleepers at intervals, the chiseling range is 850mm of the surface area outside a floating slab boss, chiseling is carried out to the outer edge of a steel sleeve along the left side and the right side of the road direction until 2 phi 16 steel bars are leaked, the length of a chiseling pit is about 625mm, the chiseling thickness is determined according to the thickness of a field protective layer and is about 8cm-12cm, the chiseling depth at the installation position of the sleeper needs to meet the installation requirement of the sleeper, and generally is 3-4cm below a transverse steel bar;

after concrete of a ballast bed is chiseled, waste residues in pits need to be cleaned, when the waste residues are cleaned, a brush is used for cleaning the waste residues with larger particle sizes, a dust collector is used for sucking out dust, then a surface agent is coated, the surface agent needs to be coated uniformly, and no accumulation and flow occur.

In specific construction, height measurement is timely carried out after the surface steel bars are chiseled to the track bed, prefabricated sleepers of different specifications are selected according to height, if the distance between the rail surface after height adjustment is not less than 314mm apart from the existing upper-layer structural steel bars 289, sleepers of 65mm are adopted, the distance between the rail surface after height adjustment is not less than 314mm, sleepers of 75mm in thickness are adopted, red triangle marks are marked on the positions of the sleepers to point to the inner sides of steel rails, aiming at the problem that steel bars (beard bars for short) extending out of the bottoms of the prefabricated sleepers conflict with the existing transverse steel bars in the track bed, the beard bars are reserved according to the original design, part of the transverse stirrups can be cut off, and the transverse 2 phi 16 steel bars close to the sleeve of the vibration isolator cannot be cut off. After the short sleeper is put in, one side of the beard rib penetrates under the transverse steel bar of the existing track bed and is bound, when the transverse steel bar of the track bed needs to be cut off at the other side, the transverse steel bar is additionally arranged after the sleeper is put in, the newly added transverse steel bar is firmly bound with the beard rib of the sleeper and the steel bar of the existing track bed, and the lap joint length of the newly added transverse steel bar and the transverse steel bar of the existing track bed is not less than 120 mm; there are in principle at least 3 transverse reinforcement bars under each sleeper.

After the sleeper is installed, sequentially installing a new fastener and connecting a steel rail; specifically, the assembly sequence of the fasteners is as follows: before assembly, cleaning up sundries and accumulated water on the upper part of a rail bearing surface of an iron base plate and in a sleeper or a bed plate nylon sleeve; then sequentially placing an insulating buffer base plate and an iron base plate; sleeving an elastic gasket and a tooth-shaped cushion block (or a flat cushion block) on the anchoring bolt, coating special grease, screwing the anchoring bolt into the nylon sleeve, wherein the screwing torque is 220N × m, an electric wrench cannot be used for screwing, and a T-shaped wrench needs to be used for screwing manually; sequentially placing a rail lower base plate, a steel rail and a gauge block; finally, placing a T-shaped bolt, an elastic strip and a flat washer, coating special grease on the upper part of the T-shaped bolt, then screwing a nut, screwing a torque of about 100 plus 120 Nx m, and installing the T-shaped bolt in the final position after the T-shaped bolt is in place, wherein a gap of 0-0.5mm is formed between the lower jaw of the front section of the middle toe of the II-shaped elastic strip and the upper surface of the insulating track gauge block;

after the accessory installation finishes buckling, floating board elevation transformation accomplishes the back and detects the orbital geometry of adjustment back, guarantees the track ride comfort, resumes jointless track again and adjusts the contact net in order to satisfy the operation condition, orbital geometry includes gauge, level, height, rail to and distortion, and the deviation value is allowed in concrete size operation is as follows:

s6, pouring concrete again to reinforce the ballast bed;

in specific construction, before concrete is poured, the inside of the pit should be kept wet; the concrete in the preferred embodiment adopts the cassiterite to obtain 230H type cement-based quick-hardening mortar; stirring uniformly by using a small-sized stirrer on site, wherein the water consumption of each package of cement (25kg) is 2.8-3L, specifically, adding 2.8L of water into a bucket, adding the cement into the bucket, stirring along with the addition, wherein the stirring time is not less than 1.5min, and if the concrete is difficult to stir uniformly in the stirring process, properly adding water but the total amount of the water is not more than 3L; after the concrete is uniformly stirred, pouring is immediately carried out in the pit, the pouring is carried out from one side, and the pouring is carried out along with vibration, so that the pouring and vibration of the bottom of the sleeper are guaranteed to be compact; when 2-3 packages of concrete are needed at the same part, the upper layer concrete is poured before the lower layer concrete is initially set, the depth of the sleeper embedded into the track is not less than 5cm, and when the depth of the sleeper embedded is insufficient, a template is arranged at a position 10cm away from the sleeper to pour the concrete so as to meet the depth of the sleeper embedded; after the concrete is poured, due to the characteristic of quick hardening, the early hydration heat is quick, and after the concrete is initially set, the water is sprayed on the surface of the concrete for maintenance in time so as to improve the performance of the concrete.

The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements made to the technical solution of the present invention by those skilled in the art without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.