CN208884574U - A kind of prestressed pavement flap support structure - Google Patents
A kind of prestressed pavement flap support structure Download PDFInfo
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- CN208884574U CN208884574U CN201821258005.4U CN201821258005U CN208884574U CN 208884574 U CN208884574 U CN 208884574U CN 201821258005 U CN201821258005 U CN 201821258005U CN 208884574 U CN208884574 U CN 208884574U
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- 239000004567 concrete Substances 0.000 claims abstract description 76
- 238000005452 bending Methods 0.000 claims abstract description 11
- 230000003014 reinforcing effect Effects 0.000 claims abstract 3
- 229910000831 Steel Inorganic materials 0.000 claims description 33
- 239000010959 steel Substances 0.000 claims description 33
- 239000011150 reinforced concrete Substances 0.000 claims description 12
- 239000002689 soil Substances 0.000 claims description 8
- 238000010276 construction Methods 0.000 abstract description 25
- 239000011378 shotcrete Substances 0.000 description 7
- 230000005484 gravity Effects 0.000 description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 5
- 238000009412 basement excavation Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Road Paving Structures (AREA)
- Devices Affording Protection Of Roads Or Walls For Sound Insulation (AREA)
Abstract
The utility model discloses a kind of prestressed pavement flap support structures, including road surface cover board, building enclosure and inner supporting structure, the building enclosure is symmetrical laying in the armored concrete diaphram wall of foundation pit two sides, it is crown beam above the building enclosure, the crown beam connects the building enclosure and first of concrete support, the inner supporting structure includes first of concrete support and bracing members, wherein, more pre-tensioned prestressing reinforcing bars are set inside first of concrete support, and top covers road surface cover board.First of concrete support both ends is securely connect with crown beam, and the bracing members both ends are individually fixed in building enclosure described in foundation pit two sides.A kind of prestressed pavement flap support structure of the utility model, pre-tensioned prestressing reinforcing bar is set in first of concrete support, the bending strength and bearing capacity of component is substantially improved, eliminates interim column and interim stand column pile, project cost is reduced, construction efficiency and safety are improved.
Description
Technical Field
The utility model belongs to subway foundation ditch construction field, more specifically relates to a prestressed pavement apron bearing structure.
Background
Urban subway construction often can influence road surface traffic, and in subway station building process, in order to reduce the open cut construction to the influence of traffic, often can adopt the construction mode of cover excavation in the same direction as building to crossing road oral area part. Firstly, the enclosing structures such as enclosing piles or underground continuous walls and the like and vertical temporary supporting columns are completed on the ground surface, and cast-in-place or prefabricated concrete pavement systems are supported by the enclosing structures and the temporary supporting columns to recover road intersection traffic. And then, earth excavation is carried out below the cover plate, a main body structure of an underground structure is built up from bottom to top, waterproof treatment is carried out, and a pavement system and temporary stand columns are dismantled after traffic fluffing is finished. When the temporary upright post is constructed by the cover-excavation sequential construction method, more latticed posts are selected as vertical supports of the cover-excavation road panel in the conventional method.
The first concrete support of foundation pit is generally used as a main stress beam in the pavement cover plate supporting structure, and the stress of the first concrete support is very large due to the large transverse span of the foundation pit and the load of a vehicle. The traditional way is that setting up interim stand and stand stake in concrete support structure below, playing the supporting role, will transversely longspan roof beam change into two little span roof beams originally to reduce the stress load that first concrete support, as shown in figure 1, prevent that first concrete support from causing the incident because of the bearing capacity is not enough. Fender pile and lattice column are vertical interim support, and the apron is located lattice column top, and from in the middle of the lattice column and both sides around avoiding passing during the steel bar construction of station roof, medium plate, bottom plate, stagnant water steel sheet is reserved to the lattice column periphery, waits that station top, well, bottom plate construction finish, covers to dig the system and cuts off lattice column after accomplishing the traffic and dismissing the task.
The method has the disadvantages that the rigidity and the bearing capacity of the lattice column are limited, so the number of the lattice column to be arranged is large, the operation space and the unearthing speed of construction machinery are influenced, the construction efficiency is reduced, special waterproof treatment is needed when the lattice column is dismantled, and the process is complex. In addition, the process of setting up of interim stand and stand stake seriously influences subway construction speed, and has the interior equipment fixing of influence station and fitment scheduling problem before demolising the stand for it is inefficient, and the consumptive material cost is extravagant, and it is inconvenient in the use.
SUMMERY OF THE UTILITY MODEL
To the above defect of prior art or improve the demand, the utility model provides a prestressed pavement cover plate bearing structure, it include pavement cover plate, envelope and right the pavement cover plate with envelope supports the inside bearing structure who props the top and holds the effect, and envelope lays the reinforced concrete underground continuous wall in foundation ditch both sides soil layer for the symmetry, and the envelope top is the crown beam, and the crown beam is reinforced concrete continuous beam to link together envelope and first concrete support, effectively prevent that the foundation ditch edge from taking place to collapse, inside bearing structure includes first concrete support and steel shotcrete, and first concrete support top covers the pavement cover plate. The two ends of the first concrete support are firmly connected with the crown beam, the steel supports are horizontally arranged and are located on the same vertical plane with the first concrete support, and the two ends of the steel supports are fixed on the two sides of the foundation pit respectively on the enclosure structure, so that the bending strength and the bearing capacity of the first concrete support are greatly improved, a temporary stand column and a temporary stand column pile are omitted, the construction cost is reduced, and the cost is saved.
In order to achieve the above object, the utility model provides a prestressed pavement cover plate supporting structure, which comprises a pavement cover plate, an enclosure structure and an internal supporting structure for supporting and propping the pavement cover plate and the enclosure structure; wherein,
the pavement cover plate is a concrete slab, and vehicles or pedestrians are directly borne above the pavement cover plate;
the enclosure structure is a reinforced concrete underground continuous wall symmetrically laid on soil layers on two sides of the foundation pit, the top of the enclosure structure is a crown beam, the crown beam is a reinforced concrete continuous beam, and the enclosure structure and the first concrete support are connected together, so that the collapse of the edge of the foundation pit is effectively prevented;
the internal support structure comprises a first concrete support and a steel support, wherein the first concrete support is covered above the pavement cover plate, two ends of the first concrete support are firmly connected with the top beam, the steel support is horizontally arranged and is located on the same vertical plane with the first concrete support, and two ends of the steel support are respectively fixed on two sides of the foundation pit on the enclosure structure.
Furthermore, the first concrete support is a pretensioned prestressed beam, and a plurality of pretensioned prestressed steel bars are arranged in the pretensioned prestressed beam, so that the bending strength and the bearing capacity of the member are greatly improved.
Further, the first concrete support and the steel support are both arranged horizontally in space.
Furthermore, the first concrete support and the steel support are located on the same vertical plane and are arranged at intervals along the direction of the pavement cover plate.
Further, the steel supports are arranged in a plurality of ways at intervals in the same vertical plane to form a continuous support network.
Further, the thickness of the pavement cover plate is 150-450 mm.
Furthermore, the enclosure structure can be an underground continuous wall or a cast-in-place bored pile, and the thickness of the enclosure structure is 0.6-1.2 m.
Generally, through the utility model discloses above technical scheme who conceives compares with prior art, can gain following beneficial effect:
(1) the utility model discloses a prestressed pavement apron bearing structure, including road surface apron, envelope and right the road surface apron with envelope supports the inside bearing structure who props up the effect, and envelope lays the reinforced concrete underground continuous wall in foundation ditch both sides soil layer for the symmetry, and the envelope top is the hat roof beam, and the hat roof beam is reinforced concrete continuous beam to support envelope and first concrete together, effectively prevent that the foundation ditch edge from taking place to cave in. The internal supporting structure comprises a first concrete support and a steel support, and the pavement cover plate is covered above the first concrete support. The two ends of the first concrete support are firmly connected with the crown beam, the steel supports are horizontally arranged and are located on the same vertical plane with the first concrete support, and the two ends of the steel supports are fixed on the two sides of the foundation pit respectively on the enclosure structure, so that the bending strength and the bearing capacity of the first concrete support are greatly improved, a temporary stand column and a temporary stand column pile are omitted, the construction cost is reduced, and the cost is saved.
(2) The utility model discloses a prestressed pavement apron bearing structure compares with traditional road surface apron bearing structure, and first concrete support is the pretension prestressed beam, and its inside many pretension prestressed reinforcement that sets up promotes the bending strength and the bearing capacity of component by a wide margin, has reduced because of building the engineering time that interim stand and interim stand pile need makes things convenient for station internal plant installation and fitment work, has improved efficiency of construction and construction safety by a wide margin.
(3) The utility model discloses a prestressed pavement cover plate bearing structure, first one concrete support with the steel shotcrete is located same vertical plane, and follows one is arranged at every interval certain distance of pavement cover plate direction, and the steel shotcrete is at same vertical plane internal interval arrangement multichannel to interim stand and interim stand stake have been cancelled.
Drawings
FIG. 1 is a schematic view of a conventional pavement cover support structure of the prior art;
fig. 2 is a schematic view of a prestressed pavement cover plate supporting structure according to an embodiment of the present invention.
In all the figures, the same reference numerals denote the same features, in particular: 1-first concrete support, 2-pavement cover plate, 3-temporary upright post, 4-connecting beam, 5-temporary upright post pile, 6-enclosure structure, 7-crown beam, 8-steel support and 9-prestressed reinforcement.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention. Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
In the schematic diagram of the conventional pavement cover plate supporting structure in the prior art shown in fig. 1, since a common concrete beam is used as the first concrete support 1, a temporary upright post 3 and a temporary upright post 5 are added in the supporting structure, so that the original large transverse span is changed into two small spans to reduce the stress load of the first concrete support, but the construction of the temporary upright post 3 and the temporary upright post 5 seriously affects the construction speed, and the problems of affecting the installation and decoration of internal equipment in a station before the upright post is removed exist, so that the use is inconvenient.
As shown in fig. 2, the embodiment of the utility model provides a prestressed pavement cover plate bearing structure includes pavement cover plate 2, envelope 6 and right pavement cover plate 2 with envelope 6 supports the inside bearing structure who props up the effect, and wherein, pavement cover plate 2 is concrete slab, and thickness is between 150 to 450 millimeters, plays the effect of undertaking load and shock-resistant, the direct vehicle, pedestrian etc. that bear in 2 tops of pavement cover plate.
The building enclosure 6 is a reinforced concrete underground continuous wall, generally has a thickness of 0.6-1.2 m, and is symmetrically poured and laid on soil layers on two sides of the foundation pit so as to ensure that soil bodies on two sides of the foundation pit are stable, control deformation of the soil body of the pit wall and ensure that adjacent buildings and the like around the foundation pit are not damaged during construction; the top of the enclosure structure 6 is provided with a crown beam 2, the crown beam 2 is a reinforced concrete continuous beam, and the enclosure structure 6 is connected with the first concrete support 1, so that collapse of the top edge of the foundation pit caused by vehicle vibration of the road surface and vibration of large construction tools is effectively prevented.
The internal supporting structure comprises a first concrete support 1 and a steel support 8, wherein the pavement cover plate 2 is covered above the first concrete support 1 and bears all gravity of the pavement cover plate 2 and vehicles, pedestrians and the like above the pavement cover plate 2, two ends of the first concrete support 1 are firmly connected with a crown beam 2 and transmit the gravity of the pavement cover plate 2 and the gravity above the pavement cover plate to the crown beam 2, and the first concrete support 1 needs to have extremely high bending strength and load bearing capacity due to the large transverse span of a pavement; supporting structure is held for the top to steel shotcrete 8, with first concrete support 1 arranges in same vertical plane, 8 both ends of steel shotcrete are fixed respectively in the foundation ditch both sides on envelope 6, and the interval arrangement multichannel in the same vertical plane steel shotcrete 8 is in order to guarantee envelope 6 is the stable in structure in the work progress. Every 6 meters along the laying direction of the pavement cover plate 2, the first concrete support 1 and the steel support 8 are arranged in a vertical plane, and the gravity of the pavement cover plate 2 and the gravity above the pavement cover plate are transmitted to the first concrete support 1, then the first concrete support 1, the crown beam 7 and finally the building envelope 6 and the steel support 8, so that a continuous support network is formed.
The utility model discloses a prestressed pavement apron bearing structure, envelope lay the reinforced concrete underground continuous wall in foundation ditch both sides soil layer for the symmetry, and the envelope top is hat the roof beam, and hat the roof beam be reinforced concrete continuous beam to link envelope and first concrete support together, prevent effectively that the foundation ditch edge from taking place to collapse, inside bearing structure includes first concrete support and steel shotcrete, and first concrete support top covers the pavement apron. The two ends of the first concrete support are firmly connected with the crown beam, the steel supports are horizontally arranged and are located on the same vertical plane with the first concrete support, and the two ends of the steel supports are fixed on the two sides of the foundation pit respectively on the enclosure structure, so that the bending strength and the bearing capacity of the first concrete support are greatly improved, a temporary stand column and a temporary stand column pile are omitted, the construction cost is reduced, and the cost is saved.
The first concrete support 1 is a pretensioned prestressed beam, a plurality of reinforcing steel bars 9 are arranged in the first concrete support, before concrete is poured, the reinforcing steel bars 9 are tensioned to generate tension, when the concrete reaches a value not lower than 75% of the designed strength value of the concrete and the reinforcing steel bars 9 and the concrete are ensured to be bonded sufficiently, the reinforcing steel bars 9 are loosened, and prestress is applied to the concrete by means of bonding of the concrete and the reinforcing steel bars 9, so that the bending strength and the bearing capacity of the first concrete support 1 are improved, and the structural safety is improved. The utility model discloses a prestressed pavement apron bearing structure compares with traditional road surface apron bearing structure, and first concrete support is the pretension prestressed beam, and its inside many pretension prestressed reinforcement that sets up promotes the bending strength and the bearing capacity of component by a wide margin, has reduced because of building the engineering time that interim stand and interim stand pile need makes things convenient for station internal plant installation and fitment work, has improved efficiency of construction and construction safety by a wide margin.
Contrast prior art conventional road surface apron bearing structure, the utility model discloses a prestressed pavement apron bearing structure is through to undertaking road surface apron 2 and above all gravity first concrete support 1 carries out the prestressing force of opening one's head, has greatly improved the bending strength and the bearing capacity of first concrete support to cancelled interim stand 3 and interim stand pile 5, reduced engineering cost, practiced thrift the cost, reduced because of building interim stand 3 with the required engineering time of interim stand pile 5 has improved the efficiency of construction, prevents interim stand 3 with interim stand pile 5 produces inconvenient influence to the construction, has promoted construction safety.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included within the scope of the present invention.
Claims (7)
1. A prestressed pavement cover plate supporting structure is characterized by comprising a pavement cover plate, an enclosure structure and an internal supporting structure for supporting and jacking the pavement cover plate and the enclosure structure; wherein,
the pavement cover plate is a concrete slab, and vehicles or pedestrians are directly borne above the pavement cover plate;
the enclosure structure is a reinforced concrete underground continuous wall symmetrically laid on soil layers on two sides of the foundation pit, the top of the enclosure structure is a crown beam, the crown beam is a reinforced concrete continuous beam, and the enclosure structure and the first concrete support are connected together, so that the collapse of the edge of the foundation pit is effectively prevented;
the internal support structure comprises a first concrete support and a steel support, wherein the first concrete support is covered above the pavement cover plate, two ends of the first concrete support are firmly connected with the top beam, the steel support is horizontally arranged and is located on the same vertical plane with the first concrete support, and two ends of the steel support are respectively fixed on two sides of the foundation pit on the enclosure structure.
2. The prestressed pavement slab supporting structure of claim 1, wherein said first concrete support is a prestressed pre-tensioned beam, and a plurality of prestressed pre-tensioned reinforcing bars are disposed therein to substantially increase the bending strength and the load-bearing capacity of the member.
3. The prestressed pavement slab supporting structure of claim 1 or 2, wherein the first concrete support and the steel support are horizontally arranged in space.
4. The prestressed pavement slab supporting structure of claim 1 or 2, wherein said first concrete support and said steel support are located on the same vertical plane and are arranged at intervals in the direction of said pavement slab.
5. The prestressed pavement slab supporting structure of claim 1, wherein said steel supports are spaced in a plurality of rows in the same vertical plane to form a continuous supporting network.
6. The prestressed pavement cover supporting structure of claim 1, wherein the thickness of said pavement cover is 150-450 mm.
7. The prestressed pavement slab supporting structure of claim 1, wherein the thickness of said enclosure is 0.6-1.2 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821258005.4U CN208884574U (en) | 2018-08-06 | 2018-08-06 | A kind of prestressed pavement flap support structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821258005.4U CN208884574U (en) | 2018-08-06 | 2018-08-06 | A kind of prestressed pavement flap support structure |
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| CN208884574U true CN208884574U (en) | 2019-05-21 |
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| CN201821258005.4U Active CN208884574U (en) | 2018-08-06 | 2018-08-06 | A kind of prestressed pavement flap support structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108914970A (en) * | 2018-08-06 | 2018-11-30 | 中铁第四勘察设计院集团有限公司 | A kind of prestressed pavement flap support structure |
| CN111794267A (en) * | 2020-07-10 | 2020-10-20 | 广州协安建设工程有限公司 | Construction method for foundation of construction elevator |
-
2018
- 2018-08-06 CN CN201821258005.4U patent/CN208884574U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108914970A (en) * | 2018-08-06 | 2018-11-30 | 中铁第四勘察设计院集团有限公司 | A kind of prestressed pavement flap support structure |
| CN111794267A (en) * | 2020-07-10 | 2020-10-20 | 广州协安建设工程有限公司 | Construction method for foundation of construction elevator |
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