CN111593861B - Connecting structure of prefabricated rail top air duct and structural slab and construction method thereof - Google Patents
Connecting structure of prefabricated rail top air duct and structural slab and construction method thereof Download PDFInfo
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- CN111593861B CN111593861B CN202010290993.6A CN202010290993A CN111593861B CN 111593861 B CN111593861 B CN 111593861B CN 202010290993 A CN202010290993 A CN 202010290993A CN 111593861 B CN111593861 B CN 111593861B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04F—FINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
- E04F17/00—Vertical ducts; Channels, e.g. for drainage
- E04F17/04—Air-ducts or air channels
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Abstract
The invention relates to a connecting structure of a prefabricated rail top air channel and a structural plate and a construction method thereof. The top of the side plate of the air duct unit is provided with the pouring groove, the structural plate is provided with the pouring hole, and concrete is poured in situ, so that the air duct unit can be reliably connected with the structural plate, a scaffold, a template and the like are not required to be erected, the construction efficiency is high, and the construction time and the cost are effectively saved; the stability and the reliability of the rail top air duct mounting structure can be obviously improved; the cast-in-place concrete can isolate the gap between the air duct unit and the structural plate, and improves the sealing property of the rail top air duct.
Description
Technical Field
The invention belongs to the technical field of rail transit, and particularly relates to a connecting structure of a prefabricated rail top air duct and a structural plate and a construction method thereof.
Background
The rail top air duct structure at the present stage is constructed by cast-in-place reinforced concrete, the construction operation environment is poor, the working procedures are complex, the speed is low, and the construction quality is difficult to guarantee due to the influence of various factors. Meanwhile, a lot of waste building wastes are generated in the construction process, so that resources are wasted and the environment is polluted.
Specifically, the construction of the cast-in-place rail top air duct has the following problems:
(1) the rail top air duct is generally located below a subway structural slab and above a rail, is a station secondary structure, and needs to be constructed later due to factors such as shield construction and the like. During the construction of rail top wind channel later stage, the scaffold that erects the structural slab has all been demolishd, needs to set up scaffold and template again, wastes time and energy and takes money.
(2) The rail top air channel is suspended below the structural plate by means of the reserved steel bars of the structural plate, the space of the rail top air channel is small, steel bar binding, concrete pouring and the like are difficult to achieve, construction quality is difficult to guarantee, and potential quality hazards are easy to remain.
(3) The cast-in-place construction of the rail top air duct is time-consuming, labor-consuming and large in investment.
Disclosure of Invention
The invention relates to a connecting structure of a prefabricated rail top air duct and a structural plate and a construction method thereof, which can at least solve part of defects in the prior art.
The invention relates to a connecting structure of a prefabricated rail top air channel and a structural plate, which comprises the rail top air channel and the structural plate, wherein the rail top air channel comprises a plurality of air channel units which are sequentially spliced along the longitudinal direction of the air channel, each air channel unit is of a prefabricated structure, the top of each air channel unit is provided with a pouring groove, the structural plate is provided with a plurality of pouring holes, each pouring hole is communicated with one pouring groove, and each air channel unit is fixedly connected to the bottom of the structural plate through cast-in-place concrete poured in each pouring hole and each pouring groove.
In one embodiment, the structural slab is further provided with a plurality of reinforcing bars protruding from the bottom of the structural slab and extending into the casting grooves below the structural slab.
In one embodiment, the reinforcing bars are U-shaped reinforcing bars embedded in the structural slab.
In one embodiment, the wall of the casting hole is at least partially an inclined wall which is inclined gradually from top to bottom toward the inside of the hole.
In one embodiment, each air duct unit includes a bottom plate and at least two side plates connected to the bottom plate, and the top of each side plate is provided with the pouring groove.
As an embodiment, each of the air duct units is an integral prefabricated member integrally prefabricated by the corresponding bottom plate and the corresponding side plate.
In one embodiment, the transverse section of the casting groove comprises an upper straight groove section with the same width from top to bottom and a section expanding section which is connected to the bottom end of the straight groove section and has the gradually increased width.
In one embodiment, the pouring grooves are through grooves which extend longitudinally along the rails and penetrate through the front ends and the rear ends of the corresponding side plates, and the pouring grooves of the side plates arranged on the same side are communicated with each other.
The invention also relates to a construction method of the connection structure of the rail top air channel and the structural plate, which comprises the following steps:
prefabricating each air duct unit;
and (3) carrying out the assembly construction of each air duct unit, wherein the assembly construction of each air duct unit comprises the following steps: and after the air duct unit rises to the proper position, taking a temporary fixing measure, pouring concrete into the pouring holes reserved in the structural plates at the corresponding positions, and enabling the concrete to enter the pouring grooves of the air duct unit, so that the air duct unit and the structural plates are fixedly connected together.
As an embodiment, the air duct unit is lifted by a lifting device on the structural plate or by a jacking device below the structural plate.
The invention has at least the following beneficial effects:
according to the invention, the pouring groove is arranged at the top of the side plate of the air duct unit, after concrete is cast in the pouring groove from the pouring hole on the structural plate, the reliable connection between the air duct unit and the structural plate can be realized, scaffolds, templates and the like are not required to be erected, the construction is convenient, the construction speed is high, the efficiency is high, and the construction time and the cost are effectively saved. The air duct unit and the structural plate are fixedly integrated into a whole through cast-in-place concrete, so that the air duct unit and the structural plate are stressed cooperatively, and the stability and the reliability of the rail top air duct mounting structure can be obviously improved; cast-in-place concrete enters the pouring groove from the pouring hole in the structural slab, so that the gap between the air duct unit and the structural slab can be isolated, and the sealing performance of the rail top air duct is effectively improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a connection structure of a prefabricated rail top air duct at a pouring hole and a structural slab according to an embodiment of the present invention;
FIG. 2 is a schematic view of a connection structure of a prefabricated rail top air duct at a non-casting hole and a structural slab according to an embodiment of the present invention;
fig. 3 is a schematic view of a connection structure between a structural slab and a prefabricated rail top air duct (a casting groove includes a section expansion section) provided in an embodiment of the present invention;
FIG. 4 is a side view of a connection structure of a prefabricated rail top air duct and a structural plate according to an embodiment of the present invention;
FIG. 5 is a schematic top view of a connection between a prefabricated rail top duct and a structural slab according to an embodiment of the present invention;
wherein: 1. the air duct unit comprises an air duct unit 11, side plates 12, a bottom plate 13, a pouring groove 131, a straight groove section 132, a section expanding section 2, a structural plate 21, a pouring hole 22 and a reinforcing steel bar.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example one
As shown in fig. 1 to fig. 3, an embodiment of the present invention provides a prefabricated rail roof air duct, including a plurality of air duct units 1 sequentially spliced in a longitudinal direction of the air duct, each air duct unit 1 includes a bottom plate 12 and at least two side plates 11 connected to the bottom plate 12, and in each air duct unit 1, a pouring groove 13 for pouring concrete 3 is disposed at a top of at least one of the side plates 11.
The bottom plate 12 is connected with at least two side plates 11 to form a groove-shaped structure, wherein the air duct unit 1 can adopt the structural shape of a lower hanging shielding door area, namely the air duct unit is provided with a vertical wall, and the bottom plate 12 is connected with the middle parts of the side plates 11; in alternative embodiments, which may also be used in configurations without depending walls, the bottom panel 12 is attached to the bottom ends of the side panels 11. Generally, the number of the side plates 11 is two, and two ends of the bottom plate 12 are respectively connected with the two side plates 11; in an alternative embodiment, three or more side plates 11 may also be adopted, for example, three side plates 11 are arranged in parallel at intervals, etc., depending on the actual engineering design.
Generally, after the air duct unit 1 is mounted to the lower portion of the structural plate 2, the plate surface of the bottom plate 12 is parallel to the horizontal direction, and the plate surface of the side plate 11 is parallel to the vertical direction.
In one embodiment, the air duct unit 1 is an integral prefabricated unit, that is, an integral prefabricated member formed by integrally prefabricating the bottom plate 12 and at least two side plates 11, and has the advantages of simple structure, easy manufacture and installation, less seams, low possibility of air leakage and high structural strength; in another embodiment, the air duct unit 1 is a split prefabricated unit, that is, the bottom plate 12 and the side plate 11 are split prefabricated and assembled after being delivered to a site, so that the air duct unit is easy to manufacture, high in prefabricating efficiency and convenient to transport and maintain later. The prefabrication of the air duct unit 1 can be completed under a factory line, the size standardization of the air duct unit 1 can be ensured, and the industrialization is facilitated. The prefabrication method is a conventional technology and is not described in detail herein.
In this embodiment, through set up pouring groove 13 at the curb plate 11 top of wind channel unit 1, pour hole 21 on structural slab 2 behind this pouring groove 13 cast in situ concrete 3, can realize wind channel unit 1 and structural slab 2's reliable connection, need not to set up scaffold, template etc. construction convenience, construction speed is fast, efficient, practices thrift engineering time and cost effectively. The air duct unit 1 and the structural plate 2 are fixedly integrated into a whole through the cast-in-place concrete 3, so that the air duct unit and the structural plate are stressed in a synergistic manner, and the stability and the reliability of the rail top air duct mounting structure can be obviously improved.
In one embodiment, as shown in fig. 1 to 3, each side plate 11 is an air duct side plate 11 arranged deviating from a side wall of the structure, and preferably, pouring grooves 13 are formed in the tops of two air duct side plates 11 of each air duct unit 1, so as to further ensure the stability and reliability of the installation structure of the air duct unit 1. As known to those skilled in the art, the structural side wall is a structural side wall arranged adjacent to the running rail and located on one side of the running rail away from the station board; in this embodiment, the air duct unit 1 may be an integral prefabricated member, or the air duct unit 1 may be a separate prefabricated member.
In another embodiment, each side plate 11 arranged on the same side of one group is a structural side plate 11, each structural side plate 11 is sequentially spliced to form a prefabricated structural side wall, each side plate 11 arranged on the same side of the other group is an air duct side plate 11, and the top of each air duct side plate 11 is provided with the pouring groove 13; in this embodiment, the air duct unit 1 is preferably a separate prefabricated member, which facilitates installation and construction. Furthermore, in each air duct unit 1, the structural side plate 11 and the air duct side plate 11 are both provided with a bearing part, and two ends of the bottom plate 12 are respectively supported on the bearing parts on two adjacent sides; in the present embodiment, the supporting portion is made of a bracket that is integrally prefabricated on the corresponding plate body, but the supporting portion is not limited to the above-mentioned mounting structure, and for example, fixing by bolts or the like is also possible, and details thereof are not described here.
As shown in fig. 1, the casting groove 13 may be a square groove with the same width from top to bottom; of course, the casting groove 13 is not limited to the square groove shape, for example, as shown in fig. 3, the transverse cross section of the casting groove 13 includes an upper straight groove section 131 having a uniform width from top to bottom and a cross-section expanding section 132 connected to the bottom end of the straight groove section 131 and having a gradually increasing width, and the cross-section expanding section 132 may be linearly expanded, that is, the groove wall corresponding to the cross-section expanding section 132 has a dovetail groove shape with a narrow top and a wide bottom, or may be curved, for example, the cross-section expanding section 132 has a circular shape, or may have other structures, which are not illustrated here. Compared with the case that shear force is generated between the cast-in-place concrete 3 and the wall of the casting groove 13 due to the structure of the square groove type casting groove 13, in the structure provided with the section expanding section 132, the bonding strength between the cast-in-place concrete 3 and the air duct unit 1 (namely, the wall of the casting groove 13) can be improved, the cast-in-place concrete 3 can effectively support the weight of the air duct unit 1, the friction force between the cast-in-place concrete and the air duct unit 1 is also remarkably increased, the air duct unit 1 is not easy to be separated from the cast-in-place concrete 3, and the use safety of the track air duct is further improved.
Generally, each bottom plate 12 and each side plate 11 are reinforced concrete prefabricated members; in an optional scheme, when the side plate 11 is prefabricated, an anchoring steel bar extending into the pouring groove 13 can be reserved, and the bonding strength between the side plate 11/air duct unit 1 and the cast-in-place concrete 3 can be enhanced, so that the stability and the reliability of the rail top air duct mounting structure are further improved. The anchoring steel bar can horizontally extend into the pouring groove 13, or can obliquely extend into the pouring groove 13; the anchoring bar may be a U-shaped bar or the like.
The pouring grooves 13 on each side plate 11 can be provided in plurality and arranged on the side plate 11 at intervals along the longitudinal direction of the air duct, and a plurality of pouring holes 21 are reserved on the structural plate 2 in a one-to-one correspondence manner. In another preferred embodiment, the pouring grooves 13 are through grooves which extend longitudinally along the air duct and penetrate through the front end and the rear end of the corresponding side plate 11, the pouring grooves 13 of the side plates 11 arranged on the same side are communicated with each other, the structure can improve the bonding strength between the air duct unit 1 and the cast-in-place concrete 3 and the bonding strength between the cast-in-place concrete 3 and the structural plate 2, meanwhile, the sealing performance of the connection between the air duct unit 1 and the structural plate 2 can be effectively improved, namely, the sealing performance of the rail top air duct is improved, and the side plates 11 on the same side are connected into a whole, so that the rail top air duct is stressed cooperatively, and the structural strength of the rail top air duct is further improved.
For the splicing of each air duct unit 1, understandably, the bottom plates 12 of the two air duct units 1 are correspondingly spliced, and the side plates 11 of the two air duct units are correspondingly spliced. Preferably, in two adjacent air duct units 1, the splicing position of the bottom plate 12 and the splicing position of the side plate 11 are respectively provided with a joint filling grouting pipe, the joint filling grouting pipes are communicated with each other, and the mutual permeation of grouting can be ensured, the joint filling treatment effect is ensured, and the sealing performance of the rail top air duct is improved.
As a preferred embodiment, the splicing positions of the air duct units 1 are groove-and-groove type splicing structures, compared with a flat-groove type splicing structure, the groove-and-groove type splicing structure can improve the splicing quality of the air duct units 1 and the sealing performance of the rail-top air duct, and is convenient for aligning the two adjacent air duct units 1 when being spliced, so that the splicing efficiency is improved; the splicing tongue and groove of the duct unit is shown in fig. 5 and will not be described in detail here.
Example two
As shown in fig. 1 to 5, an embodiment of the present invention provides a connection structure of a rail-top air duct and a structural plate 2, including a rail-top air duct and a structural plate 2, where the rail-top air duct includes a plurality of air duct units 1 sequentially spliced along an air duct longitudinal direction, each air duct unit 1 is a prefabricated structure, a pouring groove 13 is disposed at a top of each air duct unit 1, the structural plate 2 is provided with a plurality of pouring holes 21, each pouring hole 21 is communicated with one of the pouring grooves 13, and each air duct unit 1 is fixedly connected to a bottom of the structural plate 2 through cast-in-place concrete 3 poured into each pouring hole 21 and each pouring groove 13. The track top air duct preferably adopts the prefabricated track top air duct provided in the first embodiment, and the specific structure of each air duct unit 1 is described in the first embodiment, which is not described herein again.
As described in the above embodiment, one or more casting grooves 13 may be provided on each side plate 11, one or more casting holes 21 may be provided above each casting groove 13, and preferably, a plurality of casting holes 21 are provided right above each side plate 11, so that on one hand, the efficiency of the operation of the cast-in-place concrete 3 may be improved, and on the other hand, the effect of casting and tamping concrete in the casting grooves 13, that is, the effect of consolidating the air duct unit 1 and the structural plate 2, may be improved.
Further preferably, as shown in fig. 2 and 4, the structural slab 2 is further provided with a plurality of reinforcing bars 22 protruding from the bottom of the structural slab and extending into the casting grooves 13 below, and the arrangement of the reinforcing bars 22 can enhance the bonding strength between the side plates 11/air duct unit 1, the cast-in-place concrete 3 and the structural slab 2, thereby further improving the stability and reliability of the rail-top air duct installation structure. The above-mentioned consolidation reinforcing bar 22 is preferably a U-shaped reinforcing bar pre-embedded in the structural slab 2, but may be a reinforcing bar of other shapes; the anchoring bar may extend vertically into the casting trough 13 or may extend obliquely into the casting trough 13.
Further preferably, as shown in fig. 1 and 3, at least a part of the hole wall of the casting hole 21 is an inclined wall that gradually inclines towards the inside of the hole from top to bottom, and compared with a case that the hole wall of the casting hole 21 is a vertical surface, which causes a shearing force at a joint between the cast-in-place concrete 3 and the hole wall of the casting hole 21, the design of the inclined wall can improve the bonding strength between the cast-in-place concrete 3 and the structural slab 2 (i.e. the hole wall of the casting hole 21), and the hole wall of the casting hole 21 can effectively support the structure of the cast-in-place concrete 3, so that the friction force between the cast-in-place concrete 3 and the hole wall of the casting hole is also significantly increased, and the structural bearing capacity and durability of the top duct of the precast rail are further improved. As shown in fig. 1 and 3, the casting hole 21 is preferably a wedge-shaped hole having a wide top and a narrow bottom, and the effect is more excellent.
The embodiment of the invention also relates to a construction method of the connecting structure of the rail top air channel and the structural plate 2, which comprises the following steps:
prefabricating each air duct unit 1;
the assembly construction of each air duct unit 1 is performed, wherein the assembly construction of each air duct unit 1 includes: and (3) lifting the air duct unit 1, taking a temporary fixing measure after the air duct unit 1 is lifted to the proper position, pouring concrete 3 into the pouring hole 21 reserved in the structural slab at the corresponding position, and enabling the concrete 3 to enter the pouring groove 13 of the air duct unit 1, so that the air duct unit 1 and the structural slab 2 are fixedly connected together.
Wherein, the rising of the air duct unit 1 can be realized by the hoisting equipment on the structural plate 2 or by the jacking equipment below the structural plate 2. The jacking equipment can adopt jacking equipment commonly used in tunnel engineering; if the hoisting equipment is adopted, conventional hoisting equipment such as a hoist crane can be adopted, and meanwhile, hoisting members for bearing the crane are arranged at the tops of the two side plates 11 of the air duct unit 1 and are used for being matched with the hoisting equipment to hoist the air duct unit 1. For the above mentioned arrangement of the hoisting member and the mutual positioning and matching with the structural plate 2, reference is made to the chinese patent application CN201910628395.2, which will not be described herein. By means of the fact that the hoisting component extends into the pouring hole 21 and the cast-in-place wet node structure in the first embodiment is combined, stability and reliability of a connection structure of the air duct unit 1 and the structural plate 2 can be further improved, and installation efficiency of the rail top air duct is improved while installation quality and structural safety of the rail top air duct are improved.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (9)
1. The utility model provides a connection structure of prefabricated rail top wind channel and structural slab, includes rail top wind channel and structural slab, the rail top wind channel includes along the vertical a plurality of wind channel units of splicing in proper order in wind channel, each the wind channel unit is prefabricated structure, its characterized in that: the top of each air duct unit is provided with a pouring groove, the structural plate is provided with a plurality of pouring holes, each pouring hole is communicated with one pouring groove, and each air duct unit is fixedly connected to the bottom of the structural plate through cast-in-place concrete poured in each pouring hole and each pouring groove; the pouring grooves extend longitudinally along the air duct and penetrate through the front end and the rear end of the corresponding side plate, and the pouring grooves of the side plates arranged on the same side are communicated with each other; in two adjacent air duct units, the bottom plates of the two air duct units are correspondingly spliced, and the side plates of the two air duct units are correspondingly spliced; and joint filling grouting pipes are respectively arranged at the joint of the bottom plate and the joint of the side plates and are communicated with each other.
2. The connecting structure of the precast rail head duct and the structural plate according to claim 1, wherein: the structural slab is also provided with a plurality of consolidation reinforcing steel bars which protrude out of the bottom of the structural slab and extend into the pouring grooves below the structural slab.
3. The connecting structure of the precast rail head duct and the structural plate according to claim 2, wherein: the consolidation reinforcing steel bar is a U-shaped reinforcing steel bar pre-embedded in the structural slab.
4. The connecting structure of the precast rail head duct and the structural plate according to claim 1, wherein: the hole wall of the pouring hole is at least partially an inclined wall which is gradually inclined towards the inside of the hole from top to bottom.
5. The connecting structure of the precast rail head duct and the structural plate according to claim 1, wherein: each air duct unit comprises a bottom plate and at least two side plates connected with the bottom plate, and the top of each side plate is provided with the pouring groove.
6. The connecting structure of the precast rail head duct and the structural plate according to claim 5, wherein: each air duct unit is an integrated prefabricated part formed by integrally prefabricating a corresponding bottom plate and corresponding side plates.
7. The connecting structure of the precast rail head duct and the structural plate according to claim 1, wherein: the transverse section of the pouring groove comprises an upper straight groove section and a section expanding section, wherein the upper straight groove section is equal in width from top to bottom, the section expanding section is connected to the bottom end of the straight groove section, and the width of the section expanding section is gradually increased.
8. The construction method of the connecting structure of the precast rail head duct and the structural slab as claimed in any one of claims 1 to 7, comprising the steps of:
prefabricating each air duct unit;
and (3) carrying out the assembly construction of each air duct unit, wherein the assembly construction of each air duct unit comprises the following steps: lifting the air duct unit, taking a temporary fixing measure after the air duct unit is lifted to the right position, pouring concrete into the pouring holes reserved in the structural plates at the corresponding positions, and enabling the concrete to enter the pouring grooves of the air duct unit so as to fixedly connect the air duct unit and the structural plates together; all the pouring grooves communicated with each other at the same side are filled with cast-in-place concrete so as to improve the sealing property of the rail top air duct.
9. The construction method according to claim 8, wherein: the air duct unit is lifted by the hoisting equipment on the structural plate or by the jacking equipment below the structural plate.
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