CN-122013690-A - Stepped chiseling and embedding additional high lengthening construction method for wing wall of railway culvert

CN122013690ACN 122013690 ACN122013690 ACN 122013690ACN-122013690-A

Abstract

The invention discloses a railway culvert wing wall step type chiseling and embedded supplementing high lengthening construction method, and belongs to the technical field of railway existing line structure reconstruction construction. The method aims at solving the technical problems that the prior wing wall foundation is required to be integrally broken, the disturbance to the roadside slope is large and the safety risk is high in traditional construction, and is characterized in that automatic monitoring equipment is firstly installed on a road shoulder, then a step type chiseling line and a turning opening are marked on the prior wing wall in a measuring and releasing mode, a vertical embedded wide line is embedded in the slope, steel rail piles are driven into protection mode, working space is excavated in a layered mode, vertical cutting and step type horizontal cutting are carried out along the marked line by adopting a rope saw, finally the step face is cut, the foundation of part of the wing wall is chiseled, reinforcing steel bars are installed, concrete is poured, and the vertical embedded body and the heightened side wall combined with the prior wing wall are formed. The method is mainly used for lengthening and reconstruction construction of the existing railway culvert on the premise of ensuring railway operation safety.

Inventors

XUE HONGBO
WEI HUAHUI
LIU XIAOBO
JIANG JUNHUA
ZHANG GUOTAI
PENG GANG
LI YONGLIANG
LIU YI
LI LINGFENG
LI FEI
LIU JIANJIAN
WEI LEI
REN MING

Assignees

中铁二十五局集团第四工程有限公司
中铁二十五局集团有限公司

Dates

Publication Date: 20260512
Application Date: 20260213

Claims (10)

1. The step type chiseling and embedding additional high lengthening construction method for the wing wall of the railway culvert is characterized by comprising the following steps of: the method comprises the steps that firstly, automatic monitoring equipment is installed at a firm position of a road shoulder near a construction point of an extension culvert and used for monitoring displacement of a roadbed and a track during construction; step two, measuring and placing the step type chiseling line and marking the vertical embedded wide line of the turning opening on the existing wing wall according to the design drawing; Thirdly, driving steel rail piles at the roadbed slope excavation position of the existing wing wall to be chiseled for protection, and then carrying out slope excavation to create an operation space for cutting and pouring; fourthly, vertically embedding and supplementing wide lines along the marked turning openings, and vertically cutting the existing wing walls and the hat stones by adopting rope saw cutting equipment; fifthly, roughening the step surface formed by cutting, forming grooves with the depth of 10-20 mm and the width of 30-40mm at intervals of 100mm, then chiseling the existing wing wall foundation at the corresponding positions of the turning ports and the skimming sections by 200mm, installing reinforcing steel bars in the chiseled areas of the step surface, the grooves and the wing wall foundation, carrying out anchoring connection on the reinforcing steel bars and the existing wing wall, and then pouring concrete to form vertical embedded bodies and heightened side walls combined with the existing wing wall.
2. The method for constructing the stepped chiseling and embedding high extension of the wing wall of the culvert of the railway according to claim 1, wherein the second step specifically comprises the steps of using a total station to preliminarily measure and release positions of the stepped chiseling line and the vertical embedding wide line of a turning port on the wall surface and the cap stone surface of the existing wing wall according to the coordinates of a design drawing, drilling holes with the depth of 15 mm to 20 mm on a marking line path by adopting an electric hammer at intervals of 500 mm to 1000 mm after line position determination, embedding metal marking nails with reflective coatings in the holes, and finally using elastic coating to perform elastic line or painting along the connecting line of the metal marking nails to form continuous visible marking lines with the width of 5mm to 8 mm.
3. The method for constructing the stepped chiseling and embedded supplementing high extension of the wing wall of the culvert of the railway according to claim 1, wherein the third step comprises arranging two rows of steel rail piles at the center distance of 1.5-2.0M in the direction parallel to the edge line of the basic side slope of the existing line to form a double-layer support; the method comprises the steps of vertically driving steel rail piles into soil of a roadbed slope by adopting a vibrating hammer, controlling the driving depth of the steel rail piles to be between 3 meters and 5 meters, immediately stopping driving the steel rail piles when the penetration rate of the vibrating hammer is lower than 50 millimeters or a rigid barrier is met within 1 minute, drilling a first guide hole with the diameter of 100 millimeters to 150 millimeters on each of two adjacent sides of the steel rail piles, wherein the depth of the first guide hole is required to exceed the top of the barrier by 0.5 meters to 1.0 meter, then pouring cement mortar with the strength grade of M30 into the first guide hole, after the strength of the poured body reaches 10 megapascals, fixedly connecting the original steel rail piles with the poured body, transversely connecting the tops of the same row of adjacent steel rail piles after the steel rail pile arrangement is completed, simultaneously welding oblique channel steel cross braces between the two layers of steel rail piles to form a space truss type combined support structure, carrying out layered excavation on the side slope of the steel rail piles after the protective structure is completed, carrying out excavation thickness of 0.8 meter to 1.2 meter, keeping the net distance between the excavated slope and the steel rail piles at 0.3 meter, carrying out temporary excavation in a full-layer excavation process of 0.5 meter, stopping the horizontal excavation of the steel rail piles at a small distance of 20 millimeters, and carrying out a horizontal displacement in a full-layer of the pile excavation process of 20mm, and stopping the horizontal excavation process when the horizontal displacement is not carried out at the top of the pile is required to be greater than 20 meters, and excavating the next layer after the concrete strength reaches 70% of the design value, wherein the finally formed excavating surface is expanded outwards by 1.2-1.8 m than the stepped chiseling line of the wing wall.
4. The method for constructing the stepped chiseling and the embedded high extension of the wing wall of the culvert, according to claim 1, is characterized by comprising the following steps of firstly drilling a second guide hole penetrating through the thickness of the existing wing wall at one end of a marked connecting port vertical embedded wide line when vertical cutting is carried out, enabling a cutting rope of a rope saw device to penetrate through the second guide hole and tensioning the cutting rope to form a closed cutting loop, starting the rope saw device to carry out first cutting along the marked line, controlling the depth of the first cutting to be one third to one half of the thickness of the wall to form a guide groove, adjusting the tensioning force and the cutting speed of the rope saw device after the first cutting is completed, carrying out second cutting along the same guide groove until the existing wing wall and hat stone are completely cut through, forming a complete vertical cutting surface, and arranging a set of circulating water cooling system with a pressure regulating valve and an atomizing nozzle in the whole process of carrying out vertical and horizontal cutting, enabling a water outlet of the system to be aligned with the cutting rope or the contact part of the cutting saw blade and the wall, maintaining the cooling force to be between 0.2 Pa and 0.4 Pa, and finishing the horizontal cutting of the small-diameter parallel layer from the top of the wall surface to the surface, and finishing the horizontal cutting when the fine layer is required to be cut from the top of the wall surface to be 0mm, and the horizontal layer is gradually cut down, and the fine layer is completely cut from the top surface is completely cut, and the top layer is completely cut down along the surface is completely and the surface along the surface layer is completely required to be cut.
5. The method for constructing the stepped chiseling and embedding high extension of the wing wall of the culvert in the railway according to claim 4, wherein the stepped horizontal cutting further comprises the steps of detecting the strength of the existing wing wall body below a planned cutting path by using a rebound tester before starting horizontal cutting of each layer, selecting at least three areas, testing 16 points in each area, when the average rebound value of a certain area is lower than 20 or the discreteness is higher than 5, pre-implanting a row of threaded reinforcing steel bars with the diameter of 12 mm and the length of 300 mm at the position of 100 mm below the horizontal cutting line of the layer as temporary reinforcing ribs, welding and pouring the exposed parts with the reinforcing steel bars of the subsequently constructed raised side wall, performing layered backward mode when horizontal cutting, immediately using a crack observer to scan the crack on the surface of the horizontal cutting surface and the adjacent existing wall body after finishing horizontal cutting of one step height, recording the width and the length of any new crack or expansion, and if the average rebound value of a certain area is lower than 20.3 mm and the discrete value is greater than 5, performing water pressure jet grouting to the tip end of the crack at the position of 200mm, and removing the tip of the crack by using a water gun to remove the slurry, and performing slurry pressure of 50 mm, and removing the slurry pressure from the tip of the hole.
6. The method for constructing the stepped chiseling and the embedded additional high extension of the wing wall of the culvert of the railway according to claim 5, wherein the horizontal cutting is performed in a layered step backward mode, namely, the horizontal cutting along the length direction of the wing wall is finished at the same elevation to form a horizontal section, the next horizontal cutting is performed at the next step height, and the vertical distance between two adjacent horizontal cutting surfaces is the step height.
7. The method for constructing the stepped chiseling and embedded supplementing high extension of the wing wall of the culvert according to claim 1, wherein the fifth step specifically comprises the steps of chiseling all the step surfaces formed by cutting, forming an included angle between the impact direction and the step surfaces of 45-60 degrees during chiseling, chiseling the depth to expose the surface aggregate part, chiseling a transverse groove at intervals of 100 mm along the step surfaces, wherein the groove depth is 10 mm, the width is 35 mm, the length of the groove penetrates through the width of the whole step surface, chiseling the existing wing wall foundation at the positions corresponding to the turning ports and the skimming sections by 200 mm deep after finishing the step surface treatment and cleaning scraps, removing all loose particles and dust in the chiseled step surfaces, the groove and the chiseling area of the wing wall foundation, lifting the prefabricated vertical main ribs and the frameworks of the transverse distribution ribs into place during steel bar installation, inserting one end of the L-shaped constructional ribs for pouring the vertical embedded supplementing into the chiseling area of the wing wall foundation, fixing the other end of the groove with the raised side wall foundation, and binding the other end of the groove with the chiseling area of the raised side wall framework before pouring the step surface and cleaning the groove and the water-side foundation after cleaning.
8. The method for constructing the stepped chiseling and embedding additional high extension of the wing wall of the culvert of the railway according to claim 7, wherein the steel bar installation further comprises the steps of firstly drilling holes with the aperture of 4 mm to 6mm larger than the diameter of the main bar on the step surface of the existing wing wall corresponding to the design position of the vertical main bar before the steel bar skeleton of the heightened side wall is in place, using an electric hammer to drill holes with the depth of 150 mm, injecting epoxy resin adhesive into the holes, then inserting the end parts of the vertical main bar of the heightened side wall into the holes to ensure the insertion depth to be not smaller than 120 mm, binding and fixing the rest parts of the steel bar skeleton of the heightened side wall after the epoxy resin is solidified, and additionally welding a horizontal short steel bar with the length of not smaller than 200 mm on the outer side of corners of the vertical section and the horizontal section of the L-shaped structural bar installed in the foundation removal area of the wing wall, wherein the short steel bar and the L-shaped structural bar are welded to form a triangular support.
9. The method for constructing the stepped chiseling and the embedded high extension of the wing wall of the railway culvert, which is disclosed by claim 8, is characterized in that concrete casting is carried out from the bottom of a chiseling area of a wing wall foundation, a layered continuous casting mode is adopted, the casting thickness of each layer is not more than 500 mm, when the concrete is cast to the lower edge of a transverse groove, an inserted vibrating rod with the diameter of 30 mm is used for vibrating the inner area of the groove, the vibrating rod is inserted into the bottom of the groove and is slowly pulled out, the groove is ensured to be completely filled and compacted by the concrete, casting is stopped temporarily when the concrete is cast to the height of a step surface, the concrete surface at the junction of the step surface is beaten by using a wood trowel, then concrete of a heightened side wall part is continuously cast upwards, after all concrete casting is finished, water permeable geotextile is covered on the top surface of the heightened side wall, the geotextile is kept continuously moist by adopting a drip irrigation mode, and the curing time is not less than 7 days.
10. The method of claim 1, further comprising the steps of constructing a cover plate on top of the raised side wall, constructing a newly built extended section wing wall and foundation in the direction of the outer route of the existing culvert, and finally performing waterproof layer construction and back backfilling of the whole extended culvert after the vertical inserts and the raised side wall are formed.

Description

Stepped chiseling and embedding additional high lengthening construction method for wing wall of railway culvert Technical Field The invention belongs to the technical field of reconstruction construction of existing railway structures, and particularly relates to a stepped chiseling and embedded supplementing high lengthening construction method for a wing wall of a railway culvert. Background When the existing culvert is lengthened and reformed on the railway operation line, the original wing wall is usually required to be heightened and lengthened. Traditional construction methods often involve the breaking of an existing wing wall foundation in its entirety or over a large area to provide space for new side wall structures. This practice can significantly disturb the slope of the road to which the wing wall is attached, potentially compromising the immediate stability of the slope and constituting a potential threat to the track geometry of the immediately adjacent railway line. Because the railway has high driving density and short skylight operation time, the construction mode with large excavation and disturbance has high safety risk, large interference to operation and very difficult implementation. Meanwhile, how to realize reliable connection of new and old structures in a limited time without damaging the main bearing part of the existing structure is always a technical problem. If the treatment is improper, a weak joint surface is easy to form between the newly poured heightened side wall and the old wing wall, and the structural integrity and long-term durability are affected. Therefore, the wing wall lengthening method capable of minimizing disturbance to the road base slope, avoiding integral foundation breaking and ensuring firm combination of new and old structures is an urgent problem to be solved in the existing line reconstruction engineering. Disclosure of Invention It is an object of the present invention to address at least the above-mentioned drawbacks and to provide at least the advantages to be described later. The invention provides a railway culvert wing wall stepped chiseling and embedded supplementing high lengthening construction method, which can reserve part of original structures through stepped cutting and combining embedded supplementing and anchoring measures under the condition that the existing wing wall foundation is not required to be broken integrally, so that the combination area and shearing resistance of new and old concrete are obviously increased, the lengthening and heightening of culvert side walls are safely and reliably realized, the disturbance to the existing line foundation side slope is reduced to the greatest extent, and the railway operation safety is ensured. The invention provides a railway culvert wing wall step type chiseling and embedded supplementing high lengthening construction method, which comprises the following steps: the method comprises the steps that firstly, automatic monitoring equipment is installed at a firm position of a road shoulder near a construction point of an extension culvert and used for monitoring displacement of a roadbed and a track during construction; step two, measuring and placing the step type chiseling line and marking the vertical embedded wide line of the turning opening on the existing wing wall according to the design drawing; Thirdly, driving steel rail piles at the roadbed slope excavation position of the existing wing wall to be chiseled for protection, and then carrying out slope excavation to create an operation space for cutting and pouring; fourthly, vertically embedding and supplementing wide lines along the marked turning openings, and vertically cutting the existing wing walls and the hat stones by adopting rope saw cutting equipment; fifthly, roughening the step surface formed by cutting, forming grooves with the depth of 10-20 mm and the width of 30-40mm at intervals of 100mm, then chiseling the existing wing wall foundation at the corresponding positions of the turning ports and the skimming sections by 200mm, installing reinforcing steel bars in the chiseled areas of the step surface, the grooves and the wing wall foundation, carrying out anchoring connection on the reinforcing steel bars and the existing wing wall, and then pouring concrete to form vertical embedded bodies and heightened side walls combined with the existing wing wall. The second step comprises the steps of using a total station to initially measure and discharge positions of a step type chiseling line and a turning hole vertical embedding wide line on the wall surface and the hat stone surface of the existing wing wall according to the coordinates of a design drawing, drilling holes with the depth of 15-20 mm on a marking line path by using an electric hammer at intervals of 500-1000 mm, embedding metal marking nails with reflective coatings in the holes, and finally using elastic coating to perform elastic line or coating alon