CN107805981B - Connecting device of prefabricated floating slab and construction method thereof - Google Patents
Connecting device of prefabricated floating slab and construction method thereof Download PDFInfo
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- CN107805981B CN107805981B CN201711076918.4A CN201711076918A CN107805981B CN 107805981 B CN107805981 B CN 107805981B CN 201711076918 A CN201711076918 A CN 201711076918A CN 107805981 B CN107805981 B CN 107805981B
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
- E01B19/003—Means for reducing the development or propagation of noise
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Abstract
The invention relates to a connecting device of prefabricated floating plates and a construction method thereof, comprising floating plates which are mutually connected and installed in a butt joint way, wherein a strip ballast bed is formed by connecting two adjacent floating plates, the middle of the ballast bed formed by two adjacent floating plates is a square hole, and the waist parts at two sides are openings; the floating slab is characterized in that grooves are formed in two side faces of the floating slab, channel steel is installed in the grooves, round holes are formed in the channel steel, and connecting pieces are installed in the channel steel and locked through long bolts. The invention has compact and reasonable structure and convenient operation, and the shear hinge has strong shear force transmission capability, good track smoothness and good vibration isolation effect by adopting the side strong shear hinge, and simultaneously solves the problem of installation space of adjacent floating plates, reduces and solves the problems of attitude errors and positioning.
Description
Technical Field
The invention relates to the technical field of connecting devices, in particular to a connecting device of a prefabricated floating slab and a construction method thereof.
Background
Along with the rapid development of urban rail transit, the response of a rail system is gradually increased due to the fact that the speed is continuously increased, and only a fastener or a ballast bed vibration isolator is adopted to isolate vibration of a section which cannot meet the special vibration reduction requirement. The floating slab track bed technology is one of the most effective track vibration and noise reduction technologies, particularly in subways and urban light rails, and has been widely applied to road sections with vibration reduction requirements of 16dB-25 dB.
However, prefabricated floating slabs are generally relatively small in longitudinal length for ease of installation. The quality of the single plate is small, so that the rail is possibly excessively displaced vertically, and the driving safety is affected; meanwhile, the vibration reduction effect of the floating plate is also affected because the vibration-taking mass is reduced. Therefore, how to reduce the vertical displacement of the track, increase the vibration-taking quality and improve the vibration-reducing effect of the floating plate becomes a urgent problem to be solved.
In the existing floating ballast bed structure, the shear hinge is an important component of the structure for transmitting shear force between adjacent floating slabs, and can share the shear force born by the steel rail at the crossing slab joint so as to lead the slabs to be deformed in a coordinated way. At present, the floating slab shear hinge mode widely used at home and abroad is divided into an upper-arranged type and a middle-arranged type. However, in the prior art, high contact stress concentration is easy to form at the contact part of the shear mandrel, and the problem of breakage of the shear mandrel occurs in engineering application. Actual operation tests show that the stress of the shear hinge core rod is very severe, the original rough estimation and the design without paying attention to details can cause the stress to exceed the standard, and the fine calculation and the detail design are required.
The shearing hinge used in the existing track system consists of a pin shaft and a shaft sleeve, is arranged between two ballast plates, and is a device for connecting adjacent floating plates at slab joints, so that the shearing hinge has the functions of transmitting shearing force and coordinating deformation of the ballast plates. The shear hinge has the function of enabling vertical displacement of adjacent floating slab joints to smoothly transition and avoiding slab head part 'staggering', and the installation quality of the shear hinge directly influences the service life of the end part of the floating slab and the stability of a train.
Existing shear hinges are typically overhead and center mounted.
The upper shear hinge is arranged on the upper surface of the floating slab end and is fixed with the slab surface through an anchor piece, and is in reliable force transmission connection with the floating slab, so that the upper shear hinge is convenient to construct and easy to adjust and replace, and an additional protruding fixing device is needed for the surface connection with the floating slab.
The middle-mounted shear hinge is positioned at the center of the end face of the floating plates, so that the longitudinal connection between the floating plates is realized. During construction, the shear hinge is bound with the steel reinforcement framework of the floating slab, and the shear hinge and the floating slab are fixedly connected into a whole after concrete is poured, so that a fixing structure is not required to be additionally arranged. The position design of the shear hinge is determined according to the construction process.
The clamping type shear hinge has the integral structure that an upper clamping piece is connected with a lower clamping piece through a connecting pull rod, and the upper clamping piece is connected with a floating plate through an anchoring piece and a fastening piece. External load can be transferred between adjacent floating plates, shearing force born by the steel rail at the span plate seam is shared, and the aim of coordinated deformation between the adjacent floating plates is fulfilled. Wherein the connecting pull rod is arranged between the adjacent floating slab joints, and in the use process, enough gaps between the slab ends and the connecting pull rod are required to be ensured so as to avoid collision interference.
The prior art has the following disadvantages:
the upper shear hinge is arranged on the upper surface of the floating slab end, and a fixing device which is additionally protruded out of the surface of the floating slab is needed, so that the overall aesthetic property of the surface of the floating slab is hindered, and the passing of personnel is inconvenient during the maintenance and evacuation of the track; in addition, the part connected with the floating slab is easy to cause the damage of the concrete structure of the floating slab in the using process.
The middle-mounted shear hinge is poured in the middle of the floating slab, and has no exposed fixed structure, but the working state, damage and rust of the material are difficult to observe from the outside after construction, and the material is difficult to overhaul and replace.
The clamping type shear hinge needs a fastener and an anchor to be connected with the floating slab, the part connected with the floating slab is easy to cause the damage of the concrete structure of the floating slab in the use process, parts below the slab are not easy to replace, and a sufficient gap is required to be ensured for the seam of the floating slab to prevent collision interference with the connecting pull rod, so that the construction difficulty is increased.
Disclosure of Invention
The applicant provides a connecting device for a prefabricated floating slab and a construction method thereof aiming at the defects in the prior art, so that the problems that the shearing hinge fixing device is exposed to prevent the appearance and evacuation are solved, the hidden design without an additional fixing device is realized, the problem that the floating slab transmits the load of a train to the maximum extent is solved, the problems of space attitude errors and positioning when the adjacent floating slabs are installed are solved, the problems that the shearing hinge is difficult to overhaul and difficult to replace are solved, and the construction method is simple and convenient.
The technical scheme adopted by the invention is as follows:
a connecting device of prefabricated floating plates comprises floating plates which are mutually connected and installed in a butt joint mode, a strip-shaped ballast bed is formed by connecting the floating plates, a square hole is formed in the middle of a ballast bed formed by two adjacent floating plates, and two side waist portions are openings; the floating slab is characterized in that grooves are formed in two side faces of the floating slab, channel steel is installed in the grooves, round holes are formed in the channel steel, and connecting pieces are installed in the channel steel and locked through long bolts.
The further technical scheme is as follows:
the structure of the single floating plate is as follows: the concrete support arm with the rectangular cross section extends from one end of the slab body, so that two adjacent floating plates form a square hole in the middle of a ballast bed; grooves are respectively formed on two sides of each concrete support arm, holes are formed in the grooves, steel pipes are arranged in the holes, and the steel pipes and concrete are poured together; the two adjacent floating plates are butted, grooves on two sides of the two floating plates are butted and flush, channel steel is arranged in a large groove at the formed opening, and the channel steel and concrete are poured together.
Inclined planes are arranged on the upper surface and the lower surface of the channel steel, and the middle part is provided with an opening; the connecting piece is of a strip-shaped structure, the section of the connecting piece is trapezoid, the inclination of the trapezoid bevel edge is consistent with the inclination of the upper surface and the lower surface of the inner side of the channel steel, the bevel edge is matched with the inclined surface of the channel steel, a plurality of mounting holes are formed in the connecting piece, and the positions of the mounting holes are in one-to-one correspondence with the holes in the concrete support arm.
The long bolt is inserted outwards from the square hole in the middle, and the nut is screwed on the outer side of the floating plate.
The construction method of the connecting device of the prefabricated floating slab comprises the following operation steps:
the first step: preparing a plurality of floating plates;
and a second step of: a plurality of floating plates are arranged in a butt joint way in sequence and are arranged into a strip ballast bed;
and a third step of: installing channel steel on the side surface of the ballast bed, and casting the channel steel and the ballast bed into a whole;
fourth step: placing the basic position of the ballast bed;
fifth step: a connecting piece is put into the channel steel;
sixth step: fixing the connecting piece with the channel steel by using a long bolt;
seventh step: and installing the complete ballast beds in sequence.
As a further improvement of the above technical scheme:
in the sixth step, long bolts penetrate from square holes in the middle of the ballast bed to two sides and penetrate through channel steel and connecting pieces; the long bolt is then secured with a high strength nut and spring washer.
The beneficial effects of the invention are as follows:
the invention has compact and reasonable structure and convenient operation, and the shear hinge has strong shear force transmission capability, good track smoothness and good vibration isolation effect by adopting the side strong shear hinge, and simultaneously solves the problem of installation space of adjacent floating plates, reduces and solves the problems of attitude errors and positioning.
The invention solves the problems that in the prior art, the concrete structure of the connection part between the anchoring piece and the floating plate is easy to damage in the use process of the upper shear hinge, and the surface flatness of the floating plate is influenced by an additional fixed connection device.
The invention solves the problems that in the prior art, the middle-set shear hinge is difficult to observe the working state, damage and rust of materials from outside and is difficult to maintain and replace.
The invention solves the problem that the joint of the anchor and the concrete is easy to damage in the using process of the clamping type shear hinge in the prior art, and parts under the plate are not easy to replace.
Meanwhile, the invention has the following advantages:
1. the side-mounted strong shear hinge adopts channel steel and a high-strength connecting piece, is integrally embedded into the side surface of the floating plate, and transmits shear force through the high-strength connecting piece, so that fatigue or overlarge stress fracture of a traditional shear bar is avoided. The stress of the fastener system and the influence of the bending stress of the steel rail are also smaller, and the smoothness of the vibration isolation effect of the floating plate at the connecting position can be effectively improved.
2. The side-mounted strong shear hinge is embedded into the side surface of the floating slab, and no additional protruding fixing device is arranged, so that the floating slab has attractive appearance, the construction and working state of the shear hinge are easy to observe, and the space of an evacuation channel and a rail side facility is not occupied.
3. The side-mounted strong shear hinge is easy to install, and is poured with the floating plate into a whole without an additional fixing device, so that the concrete structure of the floating plate is prevented from being damaged at the joint of the fixing device.
4. The high-strength connecting piece is fixed in the channel steel through the high-strength bolt, the spring washer and the high-strength nut, the high-strength bolt is detachable, the high-strength connecting piece is replaceable, the practicability is high, and the service life of the whole device is prolonged.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is an exploded view of the present invention;
FIG. 3 is a top view of the present invention;
FIG. 4 is a full cross-sectional view taken along section A-A of FIG. 3;
FIG. 5 is a schematic diagram of a floating plate according to the present invention;
FIG. 6 is a schematic view of a connector according to the present invention;
fig. 7 is a side view of the connector of the present invention.
Wherein: 1. a floating plate; 2. an inclined plane; 3. a connecting piece; 4. a long bolt; 5. channel steel; 6. a round hole; 7. square holes; 8. an opening; 9. a beveled edge; 10. and (5) mounting holes.
Detailed Description
The following describes specific embodiments of the present invention with reference to the drawings.
As shown in fig. 1, 2, 3 and 4, the prefabricated floating slab connecting device of the embodiment comprises floating slabs 1 which are mutually butt-jointed and installed, and are connected into a strip-shaped ballast bed, wherein square holes 7 are formed in the middle of the ballast bed formed by two adjacent floating slabs 1, and openings 8 are formed at the waist parts of two sides; the both sides face of floating slab 1 is provided with the recess, installs channel-section steel 5 in the recess, and it has round hole 6 to open on the channel-section steel 5, and the internally mounted of channel-section steel 5 has connecting piece 3 to through long bolt 4 locking.
As shown in fig. 5, the structure of the single floating plate 1 is: the concrete floating slab comprises a slab body, wherein one end of the slab body extends to form two concrete support arms with rectangular cross sections, so that two adjacent floating slabs 1 form a square hole 7 in the middle of a ballast bed; grooves are respectively formed on two sides of each concrete support arm, holes are formed in the grooves, steel pipes are arranged in the holes, and the steel pipes and concrete are poured together; the two adjacent floating plates 1 are butted, grooves on two sides of the floating plates are butted and flush, channel steel 5 is arranged in a large groove at the formed opening 8, and the channel steel 5 and concrete are poured together.
As shown in fig. 6 and 7, the upper and lower surfaces of the channel steel 5 are provided with inclined planes 2, and the middle part is provided with an opening; the connecting piece 3 is of a long strip-shaped structure, the section of the connecting piece is trapezoid, the inclination of the trapezoid inclined edge 9 is consistent with that of the upper surface and the lower surface of the inner side of the channel steel 5, the inclined edge 9 is matched with the inclined surface 2 of the channel steel 5, a plurality of mounting holes 10 are formed in the connecting piece 3, and the positions of the mounting holes 10 are in one-to-one correspondence with the holes in the concrete support arm. The long bolt 4 is inserted outwards from the square hole 7 in the middle, and the nut is screwed on the outer side of the floating plate 1.
The construction method of the connection device of the prefabricated floating slab of the embodiment comprises the following operation steps:
the first step: preparing a plurality of floating plates 1;
and a second step of: a plurality of floating slabs 1 are arranged in a butt joint way in sequence and are arranged into a strip ballast bed;
and a third step of: installing channel steel 5 on the side surface of the ballast bed, and casting the channel steel 5 and the ballast bed into a whole;
fourth step: placing the basic position of the ballast bed;
fifth step: the channel steel 5 is internally provided with a connecting piece 3;
sixth step: the long bolts 4 are used for fixing the connecting piece 3 and the channel steel 5;
seventh step: and installing the complete ballast beds in sequence.
In the sixth step, the long bolts 4 penetrate from the square holes 7 in the middle of the ballast bed to two sides and pass through the channel steel 5 and the connecting piece 3; the long bolt 4 is then secured with a high strength nut and spring washer.
The channel steel 5 and the high-strength connecting piece 3 are both inclined planes 9, and the angles are consistent, so that the space postures and positions of the front and rear track beds can be kept consistent under the condition that the fastening force is enough, and the heights and positions of track structures on the front and rear track beds are ensured.
The side-mounted shear hinge body comprises channel steel 5, a high-strength connecting piece 3 and a high-strength long bolt 4. The channel steel 5 is arranged on the measuring surface of the ballast bed and is cast with the ballast bed into a whole, the waist opening 8 is internally provided with the high-strength connecting pieces 3, the two high-strength connecting pieces 3 are connected in the channel steel 5 by high-strength bolts, and the high-strength connecting pieces are fixed by high-strength nuts and spring washers. The positioning between the floating plates 1 is realized, and the shearing force is transmitted through the connecting piece instead of the high-strength bolts. The shear hinge removable connector 3 is replaced.
The shear hinge body is made of steel or cast iron.
The side-mounted strong shear hinge adopts a channel steel 5 and a high-strength connecting piece 3, is integrally embedded into the side surface of the floating plate 1, and transmits shear force through the high-strength connecting piece 3.
The high-strength connecting piece 3 is fixed in the channel steel 5 through a high-strength bolt, a spring washer and a high-strength nut, the high-strength bolt is detachable, and the high-strength connecting piece 3 is replaceable.
The channel steel 5 is bound with the steel reinforcement framework of the floating slab 1, and is fixed with the floating slab 1 into a whole after concrete is poured, so that the structure is firm and safe, and the positioning is accurate.
The connecting device comprises a channel steel 5, a connecting plate, a high-strength bolt, a spring washer and a high-strength nut, wherein each plate end consists of two groups of connecting devices, the channel steel 5 is fixed in concrete, the connecting plate is fixed in the channel steel 5 through the high-strength bolt, the spring washer and the high-strength nut, and the front floating plate 1 and the rear floating plate 1 are connected.
The channel steel 5 is carbon steel such as hot rolled Q235A, Q235B, Q235C, Q235D, Q E, and can be of different types such as No. 10, no. 12, no. 14, no. 16, no. 18 and No. 20 according to different track loads, embedded into concrete, and integrally cast with the concrete in a binding and welding mode of a reinforcement cage, so that the channel steel is firm and safe.
The connecting piece 3 is made of spheroidal graphite cast iron and Q235 through rolling or forging, and is provided with three to six-hole waist-shaped pore plates, according to different track loads, different models such as 8KG, 9KG, 12KG, 15KG, 18KG, 22KG, 24KG, 30KG, 38KG, 43KG, 50KG, 60KG and the like can be adopted, and the connecting plate is a main component for transmitting shearing force, so that the stress and bending deformation of the connecting part of the floating plate 1 are more uniform, and the influence on the bending stress of the floating plate 1 and the bending stress of a steel rail is smaller, and the smoothness of the vibration isolation effect of the floating plate 1 at the connecting part can be effectively improved.
The upper surface and the lower surface of the channel steel 5 are inclined surfaces 9, the upper surface and the lower surface of the connecting plate are also inclined surfaces 9, the inclination of the two inclined surfaces 9 is consistent, the sealing performance of the connection is ensured, the friction angle is not larger than that of the two inclined surfaces, and the fixing surface can solve the problems of space attitude errors and positioning when the adjacent 1 floating plates 1 are installed.
The concrete slab is provided with a reserved bolt installation through hole, a metal sleeve is embedded in the through hole, the sleeve is consistent with the installation bolt, a high-strength bolt is placed into the concrete slab from the inner side, the concrete slab is fixedly screwed up from the outer side through a spring washer and a high-strength nut, and the two connecting plates are fixed in the corresponding channel steel 5. The bolts are usually 45 # steel, 40 boron steel or 20 manganese titanium boron steel, the strength grade is 8.8s, 10.9s or 12.9s, the spring washers are usually 65MN spring steel, 70# carbon steel or 3Cr13, the stainless steel material SUS304 or SUS316 can also be used, the specification sizes are M3, M4, M5, M6, M8, M10, M12, M14 and M16, and the high-strength bolts are only fixing pieces for clamping the connecting pieces and the channel steel 5, and no shearing force is required to be provided.
The above description is intended to illustrate the invention and not to limit it, the scope of which is defined by the claims, and any modifications can be made within the scope of the invention.
Claims (6)
1. A prefabricated floating slab's connecting device, its characterized in that: comprises floating plates (1) which are mutually connected and installed in a butt joint way, a strip ballast bed is formed by connecting two adjacent floating plates (1), a square hole (7) is formed in the middle of the ballast bed, and openings (8) are formed at the waist parts of two sides; the floating slab is characterized in that grooves are formed in two side faces of the floating slab (1), channel steel (5) is installed in the grooves, round holes (6) are formed in the channel steel (5), connecting pieces (3) are installed in the channel steel (5) and locked through long bolts (4).
2. A prefabricated floating panel connection device according to claim 1, wherein: the structure of the single floating plate (1) is as follows: the concrete floating slab comprises a slab body, wherein one end of the slab body extends to form two concrete support arms with rectangular sections, so that two adjacent floating slabs (1) form a square hole (7) in the middle of a ballast bed; grooves are respectively formed on two sides of each concrete support arm, holes are formed in the grooves, steel pipes are arranged in the holes, and the steel pipes and concrete are poured together; two adjacent floating plates (1) are butted, grooves on two sides of the floating plates are butted and flush, channel steel (5) is arranged in a large groove at an opening (8) formed, and the channel steel (5) and concrete are poured together.
3. A prefabricated floating panel connection device according to claim 1, wherein: inclined planes (2) are arranged on the upper surface and the lower surface of the channel steel (5), and the middle part is provided with an opening; the connecting piece (3) grows into a strip-shaped structure, the cross section is trapezoidal, the inclination of the upper surface and the lower surface of the inner side of the channel steel (5) is consistent with that of the trapezoidal bevel edge (9), the bevel edge (9) is matched with the inclined surface (2) of the channel steel (5), a plurality of mounting holes (10) are formed in the connecting piece (3), and the positions of the mounting holes (10) are in one-to-one correspondence with the holes in the concrete support arm.
4. A prefabricated floating panel connection device according to claim 1, wherein: the long bolt (4) is inserted outwards from the square hole (7) in the middle, and the nut is screwed on the outer side of the floating plate (1).
5. A shear hinge construction method using the prefabricated floating slab connecting device of claim 1, characterized in that: the method comprises the following operation steps:
the first step: preparing a plurality of floating plates (1);
and a second step of: a plurality of floating plates (1) are arranged in a butt joint way in sequence to form a strip ballast bed;
and a third step of: installing channel steel (5) on the side surface of the ballast bed, and casting the channel steel (5) and the ballast bed into a whole;
fourth step: placing the basic position of the ballast bed;
fifth step: a connecting piece (3) is put in the channel steel (5);
sixth step: the connecting piece (3) is fixed with the channel steel (5) by using the long bolt (4);
seventh step: and installing the complete ballast beds according to the steps in sequence.
6. The method for constructing the shear hinge of the prefabricated floating slab connecting device according to claim 5, wherein the method comprises the following steps: in the sixth step, the long bolts (4) penetrate from square holes (7) in the middle of the ballast bed to two sides and penetrate through the channel steel (5) and the connecting piece (3); the long bolt (4) is then secured with a high strength nut and spring washer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711076918.4A CN107805981B (en) | 2017-11-06 | 2017-11-06 | Connecting device of prefabricated floating slab and construction method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711076918.4A CN107805981B (en) | 2017-11-06 | 2017-11-06 | Connecting device of prefabricated floating slab and construction method thereof |
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| CN107805981A CN107805981A (en) | 2018-03-16 |
| CN107805981B true CN107805981B (en) | 2023-05-23 |
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| CN201711076918.4A Active CN107805981B (en) | 2017-11-06 | 2017-11-06 | Connecting device of prefabricated floating slab and construction method thereof |
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| GB848143A (en) * | 1957-05-27 | 1960-09-14 | Brev Ind S A | Improvements in or relating to the construction of railway tracks |
| JP3106998U (en) * | 2004-08-03 | 2005-01-27 | 戸田工業株式会社 | Track slab formwork |
| KR101158466B1 (en) * | 2011-06-15 | 2012-06-20 | 강남훈 | Easily replaceable track block having three dimensions solid shape and method for manufacturing the same, method for laying concrete track and method for laying track of automated guideway type light rail transit using the same track block |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN203065898U (en) * | 2012-12-12 | 2013-07-17 | 洛阳双瑞橡塑科技有限公司 | Longitudinal connecting mechanism of track board |
| CN103243619B (en) * | 2013-04-27 | 2015-02-25 | 洛阳双瑞橡塑科技有限公司 | Slab-type replaceable combined ballast bed system and construction process |
| CN203530787U (en) * | 2013-05-09 | 2014-04-09 | 隔而固(青岛)振动控制有限公司 | Floating ballast bed comprising clamping shear hinges |
| KR101662158B1 (en) * | 2014-08-04 | 2016-10-06 | 한국철도기술연구원 | A noise preventing apparatus of Submerged Floating Railway |
| CN205529704U (en) * | 2016-04-14 | 2016-08-31 | 上海同研城铁减振技术有限公司 | A shear hinge subassembly for prefabricating formula floating plate |
| CN207376377U (en) * | 2017-11-06 | 2018-05-18 | 西安卓控环保科技有限公司 | A kind of attachment device of prefabricated floating plate |
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2017
- 2017-11-06 CN CN201711076918.4A patent/CN107805981B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB848143A (en) * | 1957-05-27 | 1960-09-14 | Brev Ind S A | Improvements in or relating to the construction of railway tracks |
| JP3106998U (en) * | 2004-08-03 | 2005-01-27 | 戸田工業株式会社 | Track slab formwork |
| KR101158466B1 (en) * | 2011-06-15 | 2012-06-20 | 강남훈 | Easily replaceable track block having three dimensions solid shape and method for manufacturing the same, method for laying concrete track and method for laying track of automated guideway type light rail transit using the same track block |
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