阅读说明：本技术 一种暗挖排桩路基深层置换路基结构、方法与应用 (Underground excavation pile-arranging roadbed deep layer replacement roadbed structure, method and application ) 是由 叶阳升 蔡德钩 张千里 陈锋 王鹏程 闫鑫 刘景宇 张新冈 邓逆涛 朱忠林 王立 于 2021-07-12 设计创作，主要内容包括：一种暗挖排桩路基深层置换路基结构、方法与应用,包括整体整治工艺、正线整治工艺、带摩擦板路基段整治工艺,所述整体整治工艺采用纵向分步、横向间隔开挖柱列式排桩的方式置换路基填土,并对轨道结构进行高程与平面位置调整。本发明采用排桩支撑轨道结构的路基结构,通过钢筋混凝土排桩支撑轨道结构,可在确保轨道结构受力稳定及行车安全的前提下,彻底消除路基填料的沉降与膨胀变形,进而确保轨道结构的平顺性；本发明采用暗挖排桩深层置换路基的方法可在运营条件下,对正线及带摩擦板的轨道结构下部路基进行深层置换,置换过程中可以调整无砟轨道的几何状态,道岔区整治工艺根据底座板的宽度、轨旁设备情况的线路特征参考正线整治工艺及带摩擦板路。(A deep replacement roadbed structure of an underground excavation pile-arranging roadbed, a method and application comprise an integral remediation process, a main line remediation process and a roadbed section remediation process with friction plates, wherein the integral remediation process adopts a mode of excavating piles in a column-row type at longitudinal steps and transverse intervals to replace roadbed filling, and elevation and plane position adjustment is carried out on a track structure. The invention adopts the roadbed structure of the pile-row supporting track structure, and the reinforced concrete pile-row supporting track structure can thoroughly eliminate the settlement and expansion deformation of roadbed fillers on the premise of ensuring the stable stress of the track structure and the driving safety, thereby ensuring the smoothness of the track structure; the method for deeply replacing the roadbed by the underground excavated campshed can be used for deeply replacing the roadbed at the lower part of the track structure of the main track and the track structure with the friction plate under the operation condition, the geometric state of the ballastless track can be adjusted in the replacement process, and the turnout area renovation process refers to the main track renovation process and the track with the friction plate according to the width of the base plate and the line characteristics of the equipment beside the track.)

1. A method for deeply replacing a roadbed by an underground excavation pile-arranging roadbed comprises an integral treatment process which summarizes a main line treatment process, a roadbed section treatment process with friction plates and a turnout area treatment process; the main line renovation process is a renovation process aiming at a base section of a common main line; the treatment process of the roadbed section with the friction plate is a treatment process for arranging a friction plate section at the bottom of a track structure of a road bridge transition section; the turnout area renovation process is adjusted according to the width of the base plate and the line characteristics of the condition of the trackside equipment by referring to a main line renovation process and a base section renovation process with a friction plate; it is characterized in that:

the overall renovation process adopts a mode of excavating columns in a row-by-row mode at intervals in the longitudinal step-by-step mode and transversely to replace roadbed filling, and carries out track falling adjustment on a track structure; and comprises the following steps:

step 1: working groove and row pile excavation

Adjusting the longitudinal spacing dimension according to the field condition, excavating a working groove and making a track structure support, excavating square pile hole sites downwards at the bottom of the working groove along the transverse spacing certain distance, simultaneously performing wall protection, pouring concrete to a specified position below a supporting layer or a bed plate after the working groove reaches the designed depth, converting the support and making a track structure limit, and then excavating and replacing the residual hole sites to finish the replacement of the replacement unit in the first step;

step 2: track geometric state adjustment and grouting repair

After repeating the steps to replace all the fillers, adjusting the elevation and the plane position of the track structure, and finally grouting and repairing the lower part of the track structure;

the positive line renovation process comprises the following steps:

step 1: the working groove is dug and supported;

step 2: the track structure supports and limits;

and step 3: constructing square piles step by step;

and 4, step 4: adjusting the elevation and the plane of the track;

and 5: grouting and filling under the track structure;

step 6: restoring the line;

the technology for renovating the roadbed section with the friction plate comprises the following steps:

step 1: the working groove is dug and supported;

step 2: the friction plate supports and limits;

and step 3: constructing square piles step by step;

and 4, step 4: adjusting the elevation and the plane of the friction plate;

and 5: grouting and filling under the friction plate;

step 6: and (6) recovering the line.

2. The method of underground excavation piled-up roadbed deep replacement roadbed according to claim 1, wherein: the working groove undercut and support step in the main line renovation process further comprises the following steps: dividing longitudinal displacement units at certain intervals, excavating a working groove corresponding to the first-step displacement unit, namely excavating the foundation bed filler under the base plate of the first-step displacement unit, wherein the depth is 50-150 cm, and using a steel support with adjustable height to support in time in the excavation process; before excavation, firstly constructing a supporting system of a working groove according to the working point condition, and adopting a miniature steel pipe pile or a reinforced concrete dado; after excavation, a waterproof cover plate is installed at the top of the groove, so that rainwater is prevented from flowing into the working groove and the roadbed.

3. The method of underground excavation piled-up roadbed deep replacement roadbed according to claim 1, wherein: the track structure supporting and limiting step in the positive line renovation process further comprises the following steps: mechanical devices are installed below the supporting layer or the base plate to vertically support the track structure, and meanwhile, limiting devices are arranged between the road shoulders and the lines to transversely limit the track structure.

4. The method of underground excavation piled-up roadbed deep replacement roadbed according to claim 1, wherein: the step-by-step construction steps of the square piles in the main line renovation process further comprise the following steps:

firstly, manually digging a hole: dividing the groove bottom of the first-step replacement unit into a plurality of cells, and excavating and removing the cells step by step in a manual hole excavating mode;

② filling the artificial dug pile

After the hole sites are dug to the designed required depth according to the requirements, concrete is adopted for backfilling to the bottom surface of the supporting layer or the base plate for a distance of 50 cm-150 cm;

thirdly, the second step of manual hole digging

After the concrete is poured in the first step of manual hole digging pile of each groove section, performing second step of manual hole digging pile excavation;

second step replacement unit underground excavation

And repeating the first-step replacement unit underground excavation operation procedure, pouring concrete after the first-step replacement unit is completed, and supporting by adopting a mechanical jacking device.

5. The method of underground excavation piled-up roadbed deep replacement roadbed according to claim 1, wherein: the track elevation and plane adjustment step in the main line renovation process further comprises the following steps: after all the underground excavation replacement is completed, sundries on the working face are thoroughly cleaned, the renovation area, the rail stop blocks and the height-adjusting base plates in the front and back of the renovation area by a plurality of meters are replaced by standard parts, the jacking equipment and the steel support top base plate in the replacement unit are adjusted to adjust the elevation and the plane of the rail structure, the transverse limit is removed before the adjustment, and the limit is recovered after the adjustment.

6. The method of underground excavation piled-up roadbed deep replacement roadbed according to claim 1, wherein: the step of grouting and filling under the track structure in the main line renovation process further comprises the following steps: after the elevation and the plane of the track structure are adjusted, early strength concrete with the pouring strength not lower than C25 is poured to a position 0.2m below the supporting layer or the base plate, the gap of the rest 0.2m is poured by polymer mortar, isolation and segmentation are performed in the pouring process, and full grouting is ensured.

7. The method of underground excavation piled-up roadbed deep replacement roadbed according to claim 1, wherein: the step 1-6 of the process for renovating the roadbed section with the friction plate further comprises the following steps:

the working groove is dug and supported: breaking a road shoulder concrete sealing layer of a treatment section, excavating a working groove corresponding to the first-step replacement unit under a friction plate, carrying out slope excavation along a line, plastering mortar, installing a waterproof cover plate at the top of the groove, and calculating and adjusting the excavation size according to actual conditions;

the friction plate supports and limits: in the process of working groove excavation, supporting and limiting a friction plate;

the square piles are constructed step by step: in the first-step replacement unit, dividing N units, excavating step by step, constructing even units, making a retaining wall according to the progress, pouring concrete to the bottom of a working groove, performing support conversion after the concrete reaches the strength, constructing odd units, repeating the steps, and constructing row piles of the rest units, wherein N is a natural number;

adjusting the elevation and the plane of the friction plate: after the pile arrangement construction is finished, cleaning sundries on a working surface, adjusting jacking and supporting equipment of a lower support of the friction plate to perform elevation and plane adjustment, contacting transverse limit restraint before adjustment, and recovering transverse limit after adjustment is finished;

grouting and filling under the friction plate; after the falling of the road is finished, pouring early-strength concrete to 0.2m below the friction plate, pouring the residual 0.2m gap by adopting self-leveling polymer mortar, and well performing isolation and segmentation in the pouring process to ensure full grouting;

and the line is recovered: and recovering the sealing layer, caulking and performing fine line adjustment.

8. An underground excavated piled roadbed deep layer replacement structure constructed by the method for the underground excavated piled roadbed deep layer replacement roadbed according to any one of the claims 1 to 7, characterized in that: the lower part of the track structure comprising the friction plate is filled with concrete and mortar, the thickness is 50 cm-150 cm, and the range from the lower part of the concrete and mortar layer to the top surface of the foundation is a column-column type reinforced concrete row pile.

9. The method of deeply replacing a roadbed by an underground excavated piler roadbed according to any one of claims 1 to 7 is applied to the construction of a high-speed railway track.

10. The underground excavated campshed roadbed deep replacement structure of claim 8 is applied to high-speed railway track construction.

Technical Field

The invention relates to a structure for engineering construction, a method and application thereof, in particular to a deep replacement structure of an underground excavated row-pile roadbed, a method and application thereof.

Background

Along with the increase of the construction scale of the high-speed railway in China, the problems of subgrade settlement and arching are increasingly shown, the smoothness of a track structure is reduced, the workload of maintenance and repair of equipment management departments is increased, and some work points even operate at a limited speed. The reason for causing subgrade settlement or arching is complex, wherein the deformation influence of subgrade fillers is large, and aiming at the problems, a method for replacing subgrade shallow layer fillers is adopted in a working point with serious deformation under the operation condition, so that the influence of subgrade deformation is relieved to a certain extent. However, the field monitoring and analysis of a typical roadbed deformation site show that the deformation of the deep part of the roadbed often occupies a large proportion, and an effective treatment measure is also lacked for the problem that the deformation of the deep part of the roadbed causes the deformation of a track structure, particularly for a roadbed section with high fill.

Prior art, such as the application number of chinese patent application: CN201810235288.9, inventive name: a method for renovating an upper arch of a ballastless track roadbed, however, the technical scheme can only carry out replacement and filling on a shallow layer of the roadbed, the replacement and filling depth is about 1.0m, and the problem of deep replacement and filling cannot be solved; application No.: CN201910463876.2, inventive name: however, the ballastless track deformation treatment method in the technical scheme has large excavation and replacement engineering amount, support engineering amount, difficulty and safety risk, and as ballastless tracks under most operation conditions do not have large-scale mechanical equipment operation conditions, the second technical scheme can only adopt manual operation, so that the construction period is increased, the long-term operation of a line is further caused, and meanwhile, the construction cost is high.

Disclosure of Invention

According to the invention, the problems of deep-layer filling and ballastless track roadbed filling and ballastless track elevation and plane position adjustment under the operation condition are solved by the underground pile digging mode and the roadbed structure.

The invention adopts the following technical scheme:

the invention discloses a method for deeply replacing a roadbed by an underground excavated campshed roadbed, which comprises an integral treatment process summarizing a main line treatment process, a roadbed section treatment process with friction plates and a turnout area treatment process; the main line renovation process is a renovation process aiming at a base section of a common main line; the treatment process of the roadbed section with the friction plate is a treatment process for arranging a friction plate section at the bottom of a track structure of a road bridge transition section; the turnout area renovation process is adjusted according to the width of the base plate and the line characteristics of the condition of the trackside equipment by referring to a main line renovation process and a roadbed section renovation process with a friction plate; it is characterized in that:

the overall renovation process adopts a mode of excavating columns in a row-by-row manner at intervals in the longitudinal step-by-step mode to replace road foundation filling, and performs track falling adjustment on a track structure; and comprises the following steps:

step 1: working groove and row pile excavation

Adjusting the longitudinal spacing dimension according to the field condition, excavating a working groove and making a track structure support, excavating square pile hole sites downwards at the bottom of the working groove along the transverse spacing certain distance, simultaneously performing wall protection, pouring concrete to a specified position below a supporting layer or a bed plate after the working groove reaches the designed depth, converting the support and making a track structure limit, and then excavating and replacing the residual hole sites to finish the replacement of the replacement unit in the first step;

step 2: track geometric state adjustment and grouting repair

After repeating the steps to replace all the fillers, adjusting the elevation and the plane position of the track structure, and finally grouting and repairing the lower part of the track structure;

the positive line renovation process comprises the following steps:

step 1: the working groove is dug and supported;

step 2: the track structure supports and limits;

and step 3: constructing square piles step by step;

and 4, step 4: adjusting the elevation and the plane of the track;

and 5: grouting and filling under the track structure;

step 6: restoring the line;

the technology for renovating the roadbed section with the friction plate comprises the following steps:

step 1: the working groove is dug and supported;

step 2: the friction plate supports and limits;

and step 3: constructing square piles step by step;

and 4, step 4: adjusting the elevation and the plane of the friction plate;

and 5: grouting and filling under the friction plate;

step 6: and (6) recovering the line.

The invention also discloses a deep replacement structure of the underground excavated campshed roadbed, which is characterized in that: the lower part of the track structure (including the friction plate) is filled with concrete and mortar, the thickness is generally 50 cm-150 cm, and the range from the lower part of the concrete and mortar layer to the top surface of the foundation is a column-type reinforced concrete row pile.

The invention also discloses a method for deeply replacing the roadbed by the underground excavated row-pile roadbed, which is applied to the construction of the high-speed railway track.

The invention also discloses a deep replacement structure of the underground excavated row-pile roadbed, which is applied to the construction of the high-speed railway track.

Has the advantages that:

the invention adopts the roadbed structure of the pile-row supporting track structure, and the reinforced concrete pile-row supporting track structure can thoroughly replace roadbed fillers on the premise of ensuring the stable stress of the track structure and the driving safety, thereby eliminating the settlement and expansion deformation of the roadbed fillers and ensuring the smoothness of the track structure.

The method for deeply replacing the roadbed by the underground excavated campshed can carry out deep replacement on the roadbed at the lower part of the track structure of the main track, the turnout area and the friction plate under the operation condition, and can adjust the geometric state of the ballastless track in the replacement process.

Drawings

FIG. 1 is a flow chart of the treatment process of the method for deeply replacing the roadbed by the underground excavation and pile arrangement of the invention;

FIG. 2 is a plan view of the division of the main line replacement unit in the main line renovation process of the method for deeply replacing the roadbed by the underground excavated campshed;

FIG. 3 is an elevation view of the sub-excavation and supporting of the working groove of the front-line first-step replacement unit in the step-by-step excavation step in the method for sub-excavation and pile-row deep-layer replacement of a roadbed according to the present invention;

FIG. 4 is a plan view of the underground excavation support of the working groove of the front-line first-step replacement unit in the step-by-step excavation step in the method for deeply replacing a roadbed by underground excavation and pile-arranging according to the present invention;

FIG. 5 is a plan view of the construction of square piles of the replacement unit in the first step of the main line in the step-by-step excavation step in the method for deeply replacing a roadbed by subsurface excavation and pile-drainage of the invention;

FIG. 6 is a vertical view of a hole digging and supporting of a square pile of a first step replacement unit of a main line in a step-by-step excavation step in the method for deeply replacing a roadbed by subsurface excavated campshed piles according to the present invention;

FIG. 7 is a hole-digging plane of a square pile of a first step replacement unit on the front line of FIG. 7 in a step-by-step excavation step in the method for deeply replacing a roadbed by subsurface excavated campshed piles according to the present invention;

FIG. 8 is a front line first step replacement unit square pile pouring elevation in a step excavation step in the method for deeply replacing a roadbed by subsurface excavated campshed piles according to the present invention;

FIG. 9 is a schematic view of track structure grouting filling in a method of deeply replacing a roadbed by an underground excavated campshed according to the present invention;

FIG. 10 is a plan view of a friction plate roadbed section replacement unit partition in the method for deeply replacing a roadbed by an underground excavation and piling according to the invention;

FIG. 11 is an elevational view of the excavation and support of the friction plate provided roadbed working groove in the method for deeply replacing the roadbed by the excavation and piling of the invention;

FIG. 12 is an elevation view of a first replacement unit square pile construction and support of a friction plate roadbed in a method for deeply replacing a roadbed by subsurface excavated campshed piles according to the present invention;

FIG. 13 is an elevation view of a second replacement unit square pile construction and support of a friction plate roadbed in a method for deeply replacing a roadbed by subsurface excavated campshed piles according to the present invention;

fig. 14 is a schematic view illustrating grouting and filling under a friction plate in the method for deeply replacing a roadbed by an underground excavated campshed.

Detailed Description

As shown in fig. 1. The invention discloses a method for deeply replacing a roadbed by an underground excavated campshed roadbed, which comprises an integral treatment process, a main line treatment process, a roadbed section treatment process with friction plates and a turnout area treatment process. The overall renovation process is a summary of a main line renovation process, a road base section renovation process with a friction plate and a turnout area renovation process, the main line renovation process is a renovation process aiming at a common main line base section, and the width of a supporting layer or a base plate is generally 2.8m-3.4 m; the treatment process of the roadbed section with the friction plate is a treatment process aiming at the bottom of a track structure of a road bridge transition section, wherein the width of the friction plate can reach more than 10m, and the bottom of the friction plate is generally provided with an end thorn structure; the turnout area renovation process can be adjusted by referring to a main line renovation process and a road base section renovation process with a friction plate according to the width of a base plate, the condition of equipment beside a rail and other line characteristics.

The overall renovation process adopts a mode of excavating columns in a row-by-row manner at intervals in the longitudinal step-by-step mode to replace road foundation filling, and performs track falling adjustment on a track structure; and comprises the following steps:

step 1: working groove and row pile excavation

Adjusting the longitudinal spacing dimension according to the field condition, excavating a working groove and making a track structure support, excavating square pile hole sites downwards at the bottom of the working groove along the transverse spacing certain distance, simultaneously performing wall protection, pouring concrete to a specified position below a supporting layer or a bed plate after the working groove reaches the designed depth, converting the support and making a track structure limit, then excavating and replacing the residual hole sites, and finishing the replacement of the replacement unit in the first step;

step 2: track geometric state adjustment and grouting repair

After repeating the steps to replace all the fillers, adjusting the elevation and the plane position of the track structure, and finally grouting and repairing the lower part of the track structure;

the positive line renovation process comprises the following steps:

step 1: the working groove is dug and supported;

step 2: the track structure supports and limits;

and step 3: constructing square piles step by step;

and 4, step 4: adjusting the elevation and the plane of the track;

and 5: grouting and filling under the track structure;

step 6: restoring the line;

the technology for renovating the roadbed section with the friction plate comprises the following steps:

step 1: the working groove is dug and supported;

step 2: the friction plate supports and limits;

and step 3: constructing square piles step by step;

and 4, step 4: adjusting the elevation and the plane of the friction plate;

and 5: grouting and filling under the friction plate;

step 6: and (6) recovering the line.

The invention also discloses a deep replacement structure of the underground excavated campshed roadbed, which is characterized in that: the lower part of the track structure (including the friction plate) is filled with concrete and mortar, the thickness is generally 50 cm-150 cm, and the range from the lower part of the concrete and mortar layer to the top surface of the foundation is a column-type reinforced concrete row pile.

The invention also discloses a method for deeply replacing the roadbed by the underground excavated row-pile roadbed, which is applied to the construction of the high-speed railway track.

The invention also discloses a deep replacement structure of the underground excavated row-pile roadbed, which is applied to the construction of the high-speed railway track.

The above technical solution is explained in detail below with reference to fig. 2 to 14.

Positive line renovation process

(1) Breaking the seal within the healing range

The concrete sealing layer between the road shoulder and the line of the treatment section is broken, and when a broken stone filling layer is arranged between the lines, the broken stone filling layer is required to be completely dug.

(2) Working groove underground digging and supporting

The longitudinal replacement units are divided along the longitudinal direction, as shown in fig. 2, the 1# excavation units, the 3# excavation units, the 5# excavation units and the 7# excavation units are first-step replacement units, the 2# excavation units, the 4# excavation units and the 6# excavation units are second-step replacement units, and the widths of the first-step replacement units and the second-step replacement units are divided according to 1.5 m. Excavating a working groove corresponding to the first-step replacement unit, wherein the depth is 50-150 cm, and before excavation, construction of a support system of the working groove is firstly carried out, and a micro steel pipe pile or a reinforced concrete dado can be adopted; and in the excavation process and after the excavation is finished, a waterproof cover plate is arranged on the roadbed and the top of the line working groove, so that rainwater is prevented from flowing into the working groove and the roadbed.

(3) Track structure supports and spacing

Referring to fig. 3-4, in the underground excavation project of the working groove of each replacement unit, 6 adjustable steel supports are installed below a supporting layer or a base plate to vertically support the track structure, the longitudinal distance between the support layer and the base plate is about 0.5m, the distance between the support layer and the base plate is about 1.0m, and meanwhile, a limiting device is arranged between the road shoulders and the lines to transversely limit the track structure.

(3) Step construction of square pile

Firstly, manually digging holes

Referring to fig. 4, 5 and 6, the groove bottom of the replacement unit is divided into 3 unit grids in the first step, and the replacement unit is excavated in two steps by adopting a manual hole excavating mode, wherein the adjacent two excavated grooves comprise the first excavated cell and the third excavated cell in one groove and the second excavated cell in the other groove, and the replacement unit is excavated at intervals in a staggered mode. When manual hole digging is carried out, a protective wall is made according to the progress, meanwhile, cells which are not dug are supported, and the track structure is made to be limited.

② filling the artificial dug pile

After the adjacent groove sections and staggered hole sites are dug to the designed required depth as required, concrete is adopted for backfilling, as shown in the following figures 7-8, the top surface of the backfilling is higher than the bottom surface of the adjustable steel support by a certain height, and meanwhile, the backfilling is used for adjusting the elevation of the track structure at a certain distance from the bottom of the supporting layer or the base plate.

Thirdly, the second step of manual hole digging

And after the concrete is poured in the first-step manual hole digging pile of each groove section, carrying out second-step manual hole digging pile digging, carrying out second-step replacement unit manual hole digging, and carrying out replacement construction by using the concrete.

Fourth step of subsurface excavation replacement

And continuing to perform the artificial subsurface excavation replacement on the second step according to the mode of the first step subsurface excavation replacement, pouring concrete and supporting by adopting a mechanical jacking device.

(4) Track elevation and plane adjustment

After all the underground excavation is finished, sundries on the working face are thoroughly cleaned, the renovation area, the rail stop blocks and the heightening base plates in the front and back 30 meters of the renovation area are replaced by standard parts, jacking equipment in the second-step replacement unit and the steel support top base plate in the first-step replacement unit are adjusted to drop the track, the transverse limit is removed before the track is dropped, and the limit is restored after the track is dropped.

(5) Grouting and filling under track structure

As shown in fig. 9, after the track is completely landed, early strength concrete (the strength is not lower than C25) is poured to 0.2m below the friction plate, the gap of the remaining 0.2m is poured by polymer mortar, and isolation and segmentation are performed in the pouring process to ensure full grouting.

(6) Line restoration

The broken stones of the working groove are tamped and backfilled, and C25 concrete is adopted for repairing the lines and the road shoulder sealing layer. And after the sealing layer is constructed, sealing the construction joint by using a caulking material, and finally performing fine line adjustment.

Roadbed section renovation process with friction plate

(1) Working groove underground digging and supporting

As shown in fig. 10, the road shoulder concrete sealing layer of the treatment section is broken, the working groove corresponding to the first-step replacement unit is excavated under the friction plate, the longitudinal length of the line is 2.5m, the transverse width is 12.4m, the depth is 1.5m, the slope is opened, the excavation is carried out, mortar is applied to the surface, a waterproof cover plate is installed at the top of the groove, and the excavation size can be calculated and adjusted according to the actual situation.

(2) Friction plate support and spacing

As shown in fig. 11, the friction plate is supported and limited during the excavation of the working groove.

(3) Step construction of square pile

Referring to fig. 12-13, in the first step, 5 units are divided as shown in the figure, and are removed step by step, firstly, the second unit and the fourth unit are constructed, the wall protection is made according to the progress, the concrete is poured to the bottom of the working groove, the support conversion is carried out after the strength is reached, and then the first unit, the third unit and the fifth unit are constructed. And repeating the steps and constructing the rest unit row piles.

(4) Friction plate elevation and plane adjustment

After pile arrangement construction is completed, sundries on the working surface are thoroughly cleaned, jacking and supporting equipment supported by the lower portion of the friction plate is adjusted to perform elevation and plane adjustment, contact transverse limiting constraint is performed before adjustment, and transverse limiting is recovered after adjustment is completed.

(5) Grouting filling under friction plate

As shown in fig. 14, after the road drop is completed, early strength concrete (the strength is not lower than C25) is poured to 0.2m below the friction plate, the gap of the remaining 0.2m is poured by self-leveling polymer mortar, and isolation and segmentation are performed during the pouring process to ensure full grouting.

(6) Line restoration

And recovering the sealing layer, caulking and performing fine line adjustment.

The invention adopts the roadbed structure of the pile-row supporting track structure, and the reinforced concrete pile-row supporting track structure can thoroughly replace roadbed fillers on the premise of ensuring the stable stress of the track structure and the driving safety, thereby eliminating the settlement and expansion deformation of the roadbed fillers and ensuring the smoothness of the track structure. The method for deeply replacing the roadbed by adopting the underground excavation campshed can carry out deep replacement on roadbed fillers with different line characteristics under the operation condition, the treatment of the common main line roadbed section can refer to a main line treatment process, the treatment of the road bridge transition section with the friction plate and the end thorn section can refer to a road base section treatment process with the friction plate, and for other areas such as a turnout area and the like, the specific treatment scheme can be formulated by comprehensively referring to the overall treatment process, the main line treatment process and the road base section treatment process with the friction plate according to the line characteristics such as the base plate width of the turnout area, the condition of equipment beside a rail and the like.

Deep replacement is carried out on the alignment lines, the turnout areas and the roadbed at the lower part of the track structure with the friction plates, and the geometric state of the ballastless track can be adjusted in the replacement process.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.