CN210263137U - Rectangular underground stereo garage - Google Patents
Rectangular underground stereo garage Download PDFInfo
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- CN210263137U CN210263137U CN201921117817.1U CN201921117817U CN210263137U CN 210263137 U CN210263137 U CN 210263137U CN 201921117817 U CN201921117817 U CN 201921117817U CN 210263137 U CN210263137 U CN 210263137U
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Abstract
The utility model provides a rectangle underground stereo garage, encloses closed structure including burying underground rectangle reinforced concrete, rectangle reinforced concrete encloses closed structure and encloses to close by prefabricated reinforced concrete hollow square pile and I shape stake and form, the clearance packing has concrete in the inner chamber of hollow square pile and adjacent I shape stake, the stake interpolation muscle has been laid at the concrete top, rectangle reinforced concrete encloses the inside of closed structure and is provided with the reinforced concrete waist rail that encloses along vertical interval, the top of enclosing closed structure is fixed with the crown beam, the bottom is fixed with the reinforced concrete bottom plate, the crown beam top is erect and is equipped with the reinforced concrete roof, the ground access & exit has been seted up to the roof, be fixed with on the bottom plate and be located the inside steel construction stereo garage of rectangle reinforced concrete enclosed structure, the utility model discloses the structure includes prefabricated reinforced concrete components such as crown beam, waist rail, support and stake, enclose closed structure through establishing The construction is carried out by excavating earthwork layer by layer, supporting layer by layer and then pouring the bottom plate and the top plate, the construction period is short, and the efficiency is high.
Description
Technical Field
The utility model relates to an underground works and steel construction stereo garage, concretely relates to rectangle underground stereo garage.
Background
Along with the development of urban traffic and the improvement of the living standard of people, the quantity of automobiles kept by urban and rural residents is increased year by year, and the contradiction of few parking spaces and difficult parking is increasingly prominent. In order to solve the contradiction, the development of a stereo garage is particularly necessary, and particularly the development of a high-capacity underground stereo garage which does not occupy ground resources is particularly necessary. In public places such as hospitals with difficult outstanding parking, in residential areas such as old communities and the like, the efficient and low-cost construction of underground three-dimensional intelligent garages is significant.
Disclosure of Invention
The utility model discloses improve above-mentioned problem, promptly the to-be-solved technical problem of the utility model is that garage shortage and land used are nervous in the real life, the difficulty is built to ground, for this reason, builds secret stereo garage.
The utility model discloses a concrete implementation scheme is: a rectangular underground stereo garage comprises a rectangular reinforced concrete enclosing structure buried underground, wherein the rectangular reinforced concrete enclosing structure is formed by enclosing prefabricated reinforced concrete piles, the prefabricated reinforced concrete piles comprise hollow square piles positioned at four corners of the rectangular reinforced concrete enclosing structure and I-shaped piles continuously arranged between adjacent hollow square piles, opposite joint parts of adjacent I-shaped piles are provided with matched tongue-and-grooves, concrete is filled in an inner cavity of each hollow square pile and in a gap between adjacent I-shaped piles, pile inserting ribs are distributed at the top of the concrete, enclosed prefabricated reinforced concrete waist beams are arranged inside the rectangular reinforced concrete enclosing structure at intervals along the vertical direction, prefabricated reinforced concrete supports are fixed between adjacent reinforced concrete waist beams, and reinforced concrete crown beams are fixed at the top of the rectangular reinforced concrete enclosing structure, the reinforced concrete top plate is arranged at the top of the reinforced concrete crown beam, the reinforced concrete top plate is provided with a ground access, the bottom of the rectangular reinforced concrete enclosure structure is fixedly provided with a reinforced concrete bottom plate, and the reinforced concrete bottom plate is fixedly provided with a steel structure stereo garage located inside the rectangular reinforced concrete enclosure structure.
Furthermore, a waist beam steel support is fixed on the inner surface of each prefabricated reinforced concrete pile, a pile embedded steel plate fixedly connected with the waist beam steel support is fixed on the inner surface of each prefabricated reinforced concrete pile corresponding to each waist beam steel support, a groove for placing the reinforced concrete waist beam is formed in the upper surface of each waist beam steel support, and a steel bar connector is embedded on the inner surface of each prefabricated reinforced concrete pile corresponding to the position of the reinforced concrete bottom plate.
Furthermore, the reinforced concrete wale is formed by combining a plurality of sections of prefabricated reinforced concrete support section wales, the end part of each reinforced concrete support section wale is provided with an outward extending wale inserted bar, and the outward extending inserted bars at the end parts of the adjacent reinforced concrete support section wales are lapped and concrete is poured to enable the reinforced concrete wales to form a surrounding whole.
Furthermore, the inner side of the reinforced concrete waist rail is fixed with waist rail embedded steel plates, two ends of the reinforced concrete support are provided with support embedded steel plates, and the support embedded steel plates at the two ends of the reinforced concrete support are welded with the adjacent waist rail embedded steel plates.
Furthermore, the steel structure stereo garage comprises a plurality of rows of vertical steel columns which are vertically fixed on the reinforced concrete bottom plate, a plurality of layers of steel beams are fixed on each row of steel columns along the height direction, a crown beam embedded steel plate is embedded in the position, corresponding to the top layer steel beam, of the inner side of the reinforced concrete crown beam, and the crown beam embedded steel plate is welded with the top layer steel beam of the steel structure stereo garage.
Furthermore, a top beam reserved hole is formed in the reinforced concrete top beam, a top beam reserved inserted bar with the upper portion extending into the reinforced concrete top plate is inserted into the top beam reserved hole in the top beam, a through hole which is communicated up and down is further formed in the middle of the reinforced concrete top beam, the upper end of the inter-pile inserted bar extends into the through hole, the reinforced concrete top plate is erected on the steel beam on the top layer of the steel structure stereo garage, and a stud extending into the reinforced concrete top plate is welded on the steel beam on the top layer.
Furthermore, the prefabricated reinforced concrete pile is composed of a single section or multiple sections, when the prefabricated reinforced concrete pile is a multiple-section pile, pile end embedded steel plates are fixed on opposite end faces of vertically adjacent prefabricated reinforced concrete piles, and the pile end embedded steel plates of adjacent pile sections are connected in a welding mode.
Furthermore, the steel bar of the reinforced concrete bottom plate is connected with the prefabricated reinforced concrete pile through a steel bar connector.
Compared with the prior art, the utility model discloses following beneficial effect has: the utility model discloses the structure includes prefabricated reinforced concrete components such as hat roof beam, waist rail, support and stake, through establishing enclosing the mode that closes the structure, the layering excavation earthwork, layering support poured bottom plate and roof again, forms long, wide, the permanent reinforced concrete underground structure of rectangle that adapts to garage position deeply and satisfy predetermined parking stall quantity requirement, and the underground garage area of building is few, and it is little to require low influence all ring edge borders, and construction cycle is short, and the view is effectual, and is high-efficient, simple.
Drawings
Fig. 1 is a vertical sectional view of the present invention;
FIG. 2 is a top view of the top plate position (A-A) of the present invention;
FIG. 3 is a sectional view (B-B) of the supporting position of the present invention;
FIG. 4 is a top view of the prefabricated crown beam of the present invention;
FIG. 5 is a longitudinal sectional view of the multi-section I-shaped pile connecting structure of the present invention;
FIG. 6 is a longitudinal sectional view of the multi-section square pile connecting structure of the present invention;
FIG. 7 is a cross-sectional view of the prefabricated I-shaped standard section pile of the present invention;
FIG. 8 is a cross sectional view of the prefabricated I-shaped standard section pile of the present invention;
FIG. 9 is a cross-sectional view of a corner of an underground structure according to the present invention;
FIG. 10 is a cross-sectional view of a square pile according to the present invention;
fig. 11 is a sectional view of the joint of the precast pile, the crown beam and the top plate;
fig. 12 is a sectional view of the joint between the precast pile and the wale according to the present invention;
FIG. 13 is a side view of the precast wale of the present invention;
figure 14 is a top view of the prefabricated support of the present invention;
wherein: 11. the method comprises the following steps of prefabricating an I-shaped pile standard section 12, prefabricating an I-shaped pile lower section 13, prefabricating a square pile standard section 14, prefabricating a square pile lower section 15, pile end embedded steel plates 16 of I-shaped piles, pile end embedded steel plates 17 of square piles, filling concrete 18 after pile gaps, inter-pile inserting ribs 19, pile embedded steel plates 111 and tongue-and-groove joints.
21. The method comprises the following steps of a crown beam 22, reserved dowel holes 23, reserved dowels 24 and pre-buried steel plates of the crown beam.
31. The reinforced concrete wale 32, the wale dowel 33, the wale embedded steel plate 34, the permanent support 35, the support embedded steel plate 36, the temporary support 37, the wale steel support 38 and the groove.
41. Steel column 42, steel beam 43, top layer steel beam 44, reinforced concrete roof 45, pegs.
5. A reinforced concrete bottom plate 6 and an above-ground structure.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1 to 14, a rectangular underground stereo garage comprises a rectangular reinforced concrete enclosure structure buried underground, wherein the rectangular reinforced concrete enclosure structure is formed by enclosing prefabricated reinforced concrete piles, the prefabricated reinforced concrete piles comprise hollow square piles 12 and 13 positioned at four corners of the rectangular reinforced concrete enclosure structure and I- shaped piles 11 and 12 positioned between adjacent hollow square piles and continuously arranged, opposite joint parts of adjacent I-shaped piles are provided with matched tongue-and-grooves 111, concrete is filled in an inner cavity of each hollow square pile and a gap between adjacent I-shaped piles, inter-pile inserting ribs 18 are distributed at the top of the concrete, enclosed reinforced concrete waist beams 31 are vertically arranged inside the rectangular reinforced concrete enclosure structure at intervals, top beams 21 are fixed at the top of the rectangular reinforced concrete enclosure structure, and reinforced concrete top plates 44 are erected at the top of the top beams, the reinforced concrete top plate 44 is provided with a ground access, the bottom of the rectangular reinforced concrete enclosure structure is fixed with a reinforced concrete bottom plate 5, and the reinforced concrete bottom plate is fixed with a steel structure stereo garage positioned inside the rectangular reinforced concrete enclosure structure.
As shown in fig. 5 and 6, in this embodiment, two prefabricated reinforced concrete piles are used, and each pile is formed by connecting a prefabricated i-shaped lower pile section 12 located at the lower part and a prefabricated i-shaped standard pile section 11 located above the lower part, and adjacent prefabricated reinforced concrete pile sections are welded and connected through pile end embedded steel plates at the pile end parts. If the length of the lower section of the prefabricated H-shaped pile meets the requirement, the standard section of the H-shaped pile does not need to be used, and the pile end embedded steel plate at the upper end part of the lower section pile in the drawing can be cancelled. The square pile structure is also the same.
The prefabricated reinforced concrete piles are arranged and driven into the ground according to the design, the hollow square piles are distributed at four corners of the whole rectangular reinforced concrete enclosure structure, the I-shaped piles are arranged as the side length of the rectangular reinforced concrete enclosure structure and are spliced through matched tongue-and-grooves 111 arranged at opposite joint parts of the I-shaped piles, and then concrete is poured into the prefabricated reinforced concrete piles and gaps; the prefabricated reinforced concrete pile located at the bottommost part is provided with a solid pile tip to facilitate driving into the ground.
The waist beam steel support 37 is fixed on the inner surface of each prefabricated reinforced concrete pile, the pile embedded steel plate 19 fixedly connected with the waist beam steel support is fixed on the inner surface of each prefabricated reinforced concrete pile corresponding to each waist beam steel support, and the upper surface of each waist beam steel support 37 is provided with a groove 38 for placing a reinforced concrete waist beam.
The construction steps are as follows: after the rectangular reinforced concrete enclosing structure is formed, a prefabricated crown beam 21 is installed on the top of the prefabricated pile, and a temporary support 36 is arranged at the position of the crown beam; the pile embedded steel plates 19 are preset according to the designed waist rail positions, the waist rail steel supports 37 are fixed at corresponding positions after excavation, the reinforced concrete waist rails are placed in the grooves 38 of the waist rail steel supports 37, and the permanent supports 34 are welded among the reinforced concrete waist rails 31. According to the steps of conventional foundation pit excavation and supporting, earthwork is excavated in layers, supports are supported in layers, and a bottom plate and a top plate are poured to form a rectangular permanent reinforced concrete underground structure which is long, wide and deep and suitable for the position of a garage and meets the requirement of the number of preset parking spaces.
The end part of each reinforced concrete support section waist beam is provided with an outward extending waist beam joint bar 32, and the outward extending waist beam joint bars 32 of each adjacent reinforced concrete support section waist beam are lapped and poured with concrete to enable the reinforced concrete waist beams to form a surrounding whole.
The inner side of the reinforced concrete waist rail is fixedly provided with a waist rail embedded steel plate 33, the waist rail is obliquely fixedly provided with a permanent support 34, two ends of the permanent support 34 are provided with support embedded steel plates 35, and the support embedded steel plates 35 at the two ends of the permanent support 34 are respectively connected with the waist rail embedded steel plates 33 of the adjacent reinforced concrete waist rail in a welding manner.
And after earth excavation is in place, connecting reinforcing steel bars into the reinforcing steel bar connectors to form a reinforcing steel bar mesh of the reinforced concrete bottom plate, and pouring and tamping concrete to form the reinforced concrete bottom plate.
The steel structure stereo garage comprises a plurality of rows of vertical steel columns 41 which are vertically fixed on a concrete bottom plate, wherein a plurality of layers of steel beams 42 are fixed on each row of steel columns along the height direction, a top beam embedded steel plate 24 is embedded in the position, corresponding to a top layer steel beam 43, of the inner surface of a prefabricated top beam 21, and the top beam embedded steel plate 24 is welded with the top layer steel beam 43.
In this embodiment, a top beam reserved hole 22 is formed in the reinforced concrete top beam, a top beam reserved dowel 23 with the upper portion extending into the reinforced concrete top plate 44 is inserted into the top beam reserved hole 22 located in the top beam, a through hole which is through up and down is further formed in the middle of the reinforced concrete top beam, the upper end of the inter-pile dowel 18 extends into the through hole, the reinforced concrete top plate 44 is erected on the upper portion of the steel beam 43 at the top layer, a stud 45 inserted into the reinforced concrete top plate is fixed on the steel beam at the top layer, and the connection between the cast-in-place reinforced concrete top plate 44 and the steel beam 43 at the top layer is reinforced by the stud 45.
The construction comprises the following detailed steps:
1) determining the building position and parking number of the garage, and acquiring the geological survey data of the place where the garage is located and the underground and peripheral hazard source data;
2) driving the reasonably selected reinforced concrete precast pile after analysis into the ground by using proper piling equipment to form a rectangular reinforced concrete enclosing structure;
3) pouring concrete into gaps among the piles to the tops of the piles, inserting bars into the concrete, wherein the positions of the bars are opposite to the reserved holes of the crown beams;
4) the top of the rectangular reinforced concrete enclosure structure is provided with a prefabricated crown beam, a temporary support at the position of a top plate is arranged, the prefabricated crown beam and the reinforced concrete enclosure structure adopt short steel bars as joint bars, and various joint bars adopt epoxy cement, structural adhesive and the like as binders;
5) excavating the earthwork to the next layer of supporting position, fixing a waist beam steel support, placing a prefabricated reinforced concrete support section waist beam on the waist beam steel support, pouring and tamping concrete to combine the support section waist beam into an integrally enclosed waist beam, and welding a permanent support;
6) excavating to the bottom plate, pouring a plain concrete cushion layer below the bottom plate, connecting reinforcing steel bars by using a reinforcing steel bar connector embedded in the position of the bottom plate on the inner side of the precast pile, and pouring concrete on the plain concrete cushion layer to form a reinforced concrete bottom plate;
7) the method comprises the following steps that a steel structure stereo garage is installed on a concrete bottom plate in a rectangular reinforced concrete enclosing structure, the steel structure stereo garage comprises a plurality of rows of vertically arranged steel columns fixed on the concrete bottom plate, a plurality of layers of steel beams are fixed on each row of steel columns along the height direction, and the plurality of layers of steel beams and the steel columns are connected by welding or bolts; after the steel structure is installed in place, a mechanical device for intelligently controlling the movement and lifting of the automobile is installed in the steel structure;
8) welding a steel beam at the top layer of the steel structure garage and a pre-buried steel plate at the side surface of the precast crown beam, removing a temporary support at the position of a top plate, inserting steel bars into steel bar inserting holes reserved on the surface of the precast crown beam, pouring a reinforced concrete top plate in a truss reinforced floor slab form or a steel floor bearing plate form, and pouring a reinforced concrete slab and the precast crown beam into a whole;
9) and (4) building a ground access on the cast-in-place reinforced concrete top plate.
The intelligent control mechanical device which is arranged in the steel structure stereo garage and used for moving and lifting the automobile, and the parking mode and the parking equipment of the concrete garage can be designed according to the layout of the related equipment of the existing ground garage.
The utility model discloses if disclose or related to mutual fixed connection's spare part or structure, then, except that other the note, fixed connection can understand: a detachable fixed connection (for example using bolts or screws) is also understood as: non-detachable fixed connections (e.g. riveting, welding), but of course, fixed connections to each other may also be replaced by one-piece structures (e.g. manufactured integrally using a casting process) (unless it is obviously impossible to use an integral forming process).
In addition, the terms used in any aspect of the present disclosure as described above to indicate positional relationships or shapes include similar, analogous, or approximate states or shapes unless otherwise stated.
The utility model provides an arbitrary part both can be assembled by a plurality of solitary component parts and form, also can be the solitary part that the integrated into one piece technology was made.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the same; although the present invention has been described in detail with reference to preferred embodiments, it should be understood by those skilled in the art that: the invention can be modified or equivalent substituted for some technical features; without departing from the spirit of the present invention, it should be understood that the scope of the claims is intended to cover all such modifications and variations.
Claims (8)
1. A rectangular underground stereo garage is characterized by comprising a rectangular reinforced concrete enclosing structure buried underground, wherein the rectangular reinforced concrete enclosing structure is formed by enclosing prefabricated reinforced concrete piles, the prefabricated reinforced concrete piles comprise hollow square piles positioned at four corners of the rectangular reinforced concrete enclosing structure and I-shaped piles continuously arranged between adjacent hollow square piles, opposite joint parts of adjacent I-shaped piles are provided with matched tongue-and-grooves, concrete is filled in an inner cavity of each hollow square pile and a gap between adjacent I-shaped piles, inter-pile inserting ribs are distributed at the top of the concrete, enclosed prefabricated reinforced concrete waist beams are arranged inside the rectangular reinforced concrete enclosing structure at intervals along the vertical direction, prefabricated reinforced concrete supports are fixed between adjacent reinforced concrete waist beams, reinforced concrete crown beams are fixed at the top of the rectangular reinforced concrete enclosing structure, the reinforced concrete top plate is arranged at the top of the reinforced concrete crown beam, the reinforced concrete top plate is provided with a ground access, the bottom of the rectangular reinforced concrete enclosure structure is fixedly provided with a reinforced concrete bottom plate, and the reinforced concrete bottom plate is fixedly provided with a steel structure stereo garage located inside the rectangular reinforced concrete enclosure structure.
2. The rectangular underground stereo garage of claim 1, wherein a waist-beam steel support is fixed on the inner surface of each prefabricated reinforced concrete pile, a pile embedded steel plate fixedly connected with the waist-beam steel support is fixed on the inner surface of each prefabricated reinforced concrete pile corresponding to each waist-beam steel support, a groove for placing a reinforced concrete waist beam is formed in the upper surface of each waist-beam steel support, and a steel bar connector is embedded on the inner surface of each prefabricated reinforced concrete pile corresponding to a reinforced concrete bottom plate.
3. The rectangular underground stereo garage of claim 2, wherein the reinforced concrete wale is formed by combining a plurality of prefabricated reinforced concrete support section wales, the end portion of each reinforced concrete support section wale is provided with an outward extending wale inserting rib, and the outward extending inserting ribs at the end portions of the adjacent reinforced concrete support section wales are overlapped and cast with concrete to enable the reinforced concrete wales to be an enclosed whole.
4. The rectangular underground stereo garage of claim 3, wherein the reinforced concrete wale inner side is fixed with wale embedded steel plates, the two ends of the reinforced concrete support are provided with support embedded steel plates, and the support embedded steel plates at the two ends of the reinforced concrete support are welded with the adjacent wale embedded steel plates.
5. The rectangular underground stereo garage according to claim 3, wherein the steel structure stereo garage comprises a plurality of rows of vertical steel columns which are vertically fixed on a reinforced concrete bottom plate, a plurality of layers of steel beams are fixed on each row of steel columns along the height direction, a crown beam embedded steel plate is embedded in the position, corresponding to the top layer steel beam, of the inner side of the reinforced concrete crown beam, and the crown beam embedded steel plate is welded with the top layer steel beam of the steel structure stereo garage.
6. The rectangular underground stereo garage of claim 5, wherein the reinforced concrete crown beam is provided with a crown beam preformed hole, a crown beam preformed inserted bar whose upper part extends into the reinforced concrete top plate is inserted into the crown beam preformed hole on the crown beam, the middle part of the reinforced concrete crown beam is also provided with a through hole which is communicated up and down, the upper end of the inter-pile inserted bar extends into the through hole, the reinforced concrete top plate is erected on the steel beam at the top layer of the steel structure stereo garage, and the top layer steel beam is welded with a bolt which extends into the reinforced concrete top plate.
7. The rectangular underground stereo garage according to claim 1, wherein the prefabricated reinforced concrete piles are formed in a single section or multiple sections, when the prefabricated reinforced concrete piles are multiple sections, pile end embedded steel plates are fixed on opposite end faces of vertically adjacent prefabricated reinforced concrete piles, and the pile end embedded steel plates of adjacent pile sections are welded and connected.
8. The rectangular underground stereo garage of claim 2, wherein the reinforced concrete floor slab is connected to the prefabricated reinforced concrete piles via a reinforced connector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921117817.1U CN210263137U (en) | 2019-07-17 | 2019-07-17 | Rectangular underground stereo garage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921117817.1U CN210263137U (en) | 2019-07-17 | 2019-07-17 | Rectangular underground stereo garage |
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| Publication Number | Publication Date |
|---|---|
| CN210263137U true CN210263137U (en) | 2020-04-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201921117817.1U Expired - Fee Related CN210263137U (en) | 2019-07-17 | 2019-07-17 | Rectangular underground stereo garage |
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| CN (1) | CN210263137U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111809662A (en) * | 2020-07-21 | 2020-10-23 | 重鑫岩土技术(上海)有限公司 | Subway station underground structure combination construction method |
| CN111827349A (en) * | 2020-07-21 | 2020-10-27 | 重鑫岩土技术(上海)有限公司 | Method for quickly constructing underground structure of subway station by adopting combined structure technology |
| CN111852114A (en) * | 2020-07-21 | 2020-10-30 | 福州市恒坤建设发展有限公司 | Rapid construction and anti-floating method for steel structure underground garage |
| CN111877383A (en) * | 2020-07-16 | 2020-11-03 | 中铁工程设计咨询集团有限公司 | Prefabricated underground structure based on open caisson method and construction method |
-
2019
- 2019-07-17 CN CN201921117817.1U patent/CN210263137U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111877383A (en) * | 2020-07-16 | 2020-11-03 | 中铁工程设计咨询集团有限公司 | Prefabricated underground structure based on open caisson method and construction method |
| CN111809662A (en) * | 2020-07-21 | 2020-10-23 | 重鑫岩土技术(上海)有限公司 | Subway station underground structure combination construction method |
| CN111827349A (en) * | 2020-07-21 | 2020-10-27 | 重鑫岩土技术(上海)有限公司 | Method for quickly constructing underground structure of subway station by adopting combined structure technology |
| CN111852114A (en) * | 2020-07-21 | 2020-10-30 | 福州市恒坤建设发展有限公司 | Rapid construction and anti-floating method for steel structure underground garage |
| CN111852114B (en) * | 2020-07-21 | 2022-02-11 | 福州市恒坤建设发展有限公司 | Rapid construction and anti-floating method for steel structure underground garage |
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