CN113235608A - Enclosure structure for closely penetrating low-clearance bridge and construction method thereof - Google Patents
Enclosure structure for closely penetrating low-clearance bridge and construction method thereof Download PDFInfo
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- CN113235608A CN113235608A CN202110482072.4A CN202110482072A CN113235608A CN 113235608 A CN113235608 A CN 113235608A CN 202110482072 A CN202110482072 A CN 202110482072A CN 113235608 A CN113235608 A CN 113235608A
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- 238000010276 construction Methods 0.000 title claims abstract description 48
- 230000000149 penetrating effect Effects 0.000 title claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 41
- 239000010959 steel Substances 0.000 claims abstract description 41
- 238000002955 isolation Methods 0.000 claims abstract description 39
- 239000011150 reinforced concrete Substances 0.000 claims abstract description 14
- 230000002787 reinforcement Effects 0.000 claims abstract description 9
- 230000002708 enhancing effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 12
- 238000005507 spraying Methods 0.000 claims description 9
- 238000009412 basement excavation Methods 0.000 claims description 5
- 230000008569 process Effects 0.000 description 4
- 239000002689 soil Substances 0.000 description 3
- 239000004567 concrete Substances 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/08—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against transmission of vibrations or movements in the foundation soil
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Structural Engineering (AREA)
- Civil Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Paleontology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Architecture (AREA)
- Bridges Or Land Bridges (AREA)
- Foundations (AREA)
Abstract
An enclosure structure for closely passing through a low-clearance bridge and a construction method thereof belong to the technical field of tunnel construction. The open cut tunnel enclosure structure comprises an open cut tunnel enclosure structure main body and a bridge pier foundation isolation protection structure; the open cut tunnel enclosure structure main body comprises a group of enclosure rigid piles, enclosure waterproof curtains arranged on the outer sides of the enclosure rigid piles and section steel arranged on the inner sides of the enclosure rigid piles and used for enhancing the rigidity of the enclosure structure main body; and a reinforced concrete support and a steel support are erected between the enclosure rigid piles. The invention adopts the open cut tunnel enclosure structure and the servo system, greatly improves the rigidity of the bridge structure, strengthens the integral anti-deformation capability of the structure, reduces the influence of tunnel construction on operating overhead bridges, realizes the construction of micro-disturbance tunnels on the bridges, simultaneously solves the problem of limited construction space under the condition of low clearance by adopting novel liftable steel reinforcement cages, lengthening of drill rods and other modes, and improves the construction efficiency.
Description
Technical Field
The invention belongs to the technical field of tunnel construction, and particularly relates to an enclosure structure for a short-distance downward-penetrating low-clearance bridge and a construction method thereof.
Background
With the acceleration of the urbanization process in China, the construction quantity of tunnels and urban viaducts is continuously increased at a high speed. The situation that the open cut tunnel penetrates through the existing urban viaduct at a short distance and the tunnel construction is carried out in the range adjacent to the viaduct beam foundation inevitably occurs. Since the viaduct is used as a main traffic artery of an urban area and generally needs to be operated continuously, how to ensure the safe operation of the viaduct in the process of tunnel construction is a problem to be researched and solved urgently.
During open excavation tunnel construction, disturbance of surrounding soil bodies is inevitably caused, horizontal displacement and settlement of a viaduct pier foundation and additional internal force and deformation of a viaduct structure are further caused, and if the control is not good, the subway tunnel is easy to deform too much, and even safety accidents are caused.
Simultaneously, the existence of overpass certainly leads to the tunnel to wear the section low headroom operation down, and long stake construction receives the space restriction, and the space limitation of traditional mode leads to the efficiency of construction step-down, and the low headroom operation becomes the problem that awaits the measuring and solve.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide an enclosure structure for penetrating a low-clearance bridge in a short distance and a construction method thereof, which can reduce the influence of tunnel construction on the operation of an elevated bridge, solve the problem of long pile construction under the condition of low-clearance limitation and improve the construction efficiency.
The invention provides the following technical scheme: the utility model provides a closely wear envelope of low headroom bridge down which characterized in that: the bridge comprises an open cut tunnel enclosure structure main body passing through an elevated bridge section and a bridge pier foundation isolation protection structure; the enclosure structure main body of the open cut tunnel comprises a group of enclosure rigid piles, enclosure waterproof curtains arranged on the outer sides of the enclosure rigid piles and section steel arranged on the inner sides of the enclosure rigid piles and used for enhancing the rigidity of the enclosure structure main body; a reinforced concrete support and a steel support are erected between enclosure rigid piles in the main body of the open cut tunnel enclosure structure; and a servo system is arranged on the steel support.
The bridge pier foundation isolation protection structure comprises a group of isolation rigid piles and isolation waterproof curtains arranged on the outer sides among the piles; crown beams are arranged at the tops of the open cut tunnel enclosure structure main body and the pier foundation isolation protection structure;
the enclosure structure for the low-clearance bridge to pass through in the close range is characterized in that the enclosure structure main body of the open cut tunnel is arranged between the open cut tunnel and the low-clearance viaduct; the low clear overhead bridge is penetrated under the open cut tunnel, the low clear overhead bridge comprises a plurality of piers close to the open cut tunnel, and the piers comprise a plurality of bridge piles.
The enclosure structure for the short-distance downward-penetrating low-clearance bridge is characterized in that the pier foundation isolation protection structure is in an open frame shape, surrounds the outer side of a pier and is combined with the open-cut tunnel enclosure structure main body to form a whole.
The enclosure structure for the close-range downward-penetrating low-clearance bridge is characterized in that the enclosure rigid piles and the isolation rigid piles are cast-in-situ bored piles; the enclosure waterproof curtain and the isolation waterproof curtain are MJS high-pressure jet grouting piles.
A closely wear enclosure of low headroom bridge down, its characterized in that shaped steel is in I shaped steel or U shaped steel.
The enclosure structure for penetrating the low clearance bridge in the close range is characterized in that the minimum distance between the inner sides of the open cut tunnel enclosure structure main body and the pier foundation isolation protection structure and the bridge pile is 3-5d, wherein d is the diameter of the bridge pile.
The construction method of the enclosure structure for the low-clearance bridge to penetrate through in a close range is characterized by comprising the following steps:
1) constructing a rigid enclosure pile along a tunnel construction line at a pier position adjacent to the low-clearance viaduct;
2) adopting a jet grouting construction enclosure waterproof curtain at the outer side between enclosure rigid pile piles;
3) inserting section steel for enhancing the rigidity of the enclosure structure main body into the inner side between the enclosure rigid piles;
4) constructing an isolation rigid pile along the side part of the pier, and surrounding the bridge pile in the pier by matching with the open-cut tunnel enclosure structure main body;
5) constructing an isolation waterproof curtain on the outer side of the space between the isolation rigid piles by rotary spraying;
6) pouring a first reinforced concrete support for enclosing the rigid pile, isolating the crown beam at the pile top of the rigid pile and the foundation pit at the same elevation;
7) and excavating the foundation pit, constructing a reinforced concrete support and a steel support at the lower part to the bottom of the pit, excavating in sections, and constructing the reinforced concrete support, the steel support and a corresponding servo system at the corresponding section after each section of excavation is finished.
The construction method of the enclosure structure for penetrating the low-clearance bridge in a close range is characterized in that: and (3) constructing by adopting a scalable reinforcement cage in the steps 1) and 4).
The construction method of the enclosure structure for penetrating the low-clearance bridge in a close range is characterized in that: in the step 2) and the step 5), the rotary spraying construction is carried out by adopting a drill rod lengthening method.
By adopting the technology, compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, the open cut tunnel enclosure structure main body and the pier foundation isolation protection structure are adopted to surround the pile foundation of the viaduct, and the open cut tunnel enclosure structure main body, the pier foundation isolation protection structure and the internal soil body are enclosed together to form an integral structure, so that the rigidity of the bridge structure is greatly improved, the integral deformation resistance of the structure is enhanced, the influence of tunnel construction on operating overhead bridges is reduced, and the micro-disturbance tunnel construction on the bridges is realized;
2. the arrangement of the profile steel can increase the vertical rigidity of the building envelope, increase the integrity and stability of the building envelope, and meanwhile, the profile steel can be recycled after the tunnel is completed, so that the construction cost is reduced while the strength of the protection device is increased;
3. according to the invention, by adopting the protection measures of the steel support and the servo system, when the foundation pit tends to topple towards the interior of the foundation pit, the servo system can provide a force towards the exterior of the foundation pit for the enclosure rigid pile, so that the horizontal strength of the foundation pit is enhanced; meanwhile, the inserted section steel is matched, and the servo system disperses the support axial force in the working process, so that the influence on the existing viaduct bridge pier due to the overlarge steel support axial force is avoided, the construction of a micro-disturbance tunnel of the bridge is realized, and the relative stability between the tunnel and the operating viaduct is increased;
4. according to the invention, the construction of the enclosure rigid pile and the isolation rigid pile is carried out by adopting the novel compressible reinforcement cage, the reinforcement cage in a stretching state can be compressed to be shorter, the transportation and the placement of the reinforcement cage are convenient, the construction efficiency is improved, and the construction method is suitable for a low-clearance limited construction space;
5. the construction method adopts the compressible reinforcement cage and the extension drill rod for construction, adapts to the working condition of the construction of the low-clearance overhead bridge, reduces the engineering difficulty and improves the engineering construction efficiency.
Drawings
FIG. 1 is a schematic top view of the present invention;
FIG. 2 is an enlarged schematic view of the structure at A in FIG. 1;
fig. 3 is a cross-sectional structural view of the present invention.
In the figure: 1. an open cut tunnel enclosure structure main body; 11. enclosing a rigid pile; 12. enclosing a waterproof curtain; 13. section steel; 2. a bridge pier foundation isolation protection structure; 21. isolating the rigid piles; 22. isolating a waterproof curtain; 3. supporting by reinforced concrete; 4. supporting steel; 5. a servo system; 6. a crown beam; 7. open excavation of the tunnel; 8. low-clearance viaducts; 81. and (5) bridge piles.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, 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 merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
Referring to fig. 1-3, a close-distance through low-clearance bridge enclosure structure comprises an open-cut tunnel enclosure structure main body 1 and a pier foundation isolation protection structure 2, wherein the open-cut tunnel enclosure structure main body 1 passes through an overpass, the open-cut tunnel enclosure structure main body is arranged between an open-cut tunnel 7 and a low clear overpass 8, the pier foundation isolation protection structure 2 is in an open frame shape, surrounds the outer side of a pier of the low clear overpass 8 and is combined with the open-cut tunnel enclosure structure main body 1 to form a whole, the rigidity of the bridge structure is improved, and the whole deformation resistance of the bridge structure is enhanced.
Specifically, the lower clear viaduct 8 penetrates through the lower portion of the open-cut tunnel 7, the lower clear viaduct 8 comprises a plurality of piers close to the open-cut tunnel 7, each pier comprises a plurality of bridge piles 81, the minimum distance between the inner sides of the open-cut tunnel enclosure structure main body 1 and the pier foundation isolation protection structure 2 and the bridge piles 81 is 3-5d, and d is the diameter of each bridge pile 81.
Specifically, the open cut tunnel enclosure structure main body 1 is composed of a plurality of enclosure rigid piles 11, enclosure waterproof curtains 12 and section steel 13, the enclosure waterproof curtains 12 are arranged on the outer sides of the enclosure rigid piles 11, the section steel 13 is arranged on the inner sides of the enclosure rigid piles 11 and used for enhancing the rigidity of the enclosure structure main body, and reinforced concrete supports 3 and steel supports 4 are erected among the enclosure rigid piles 11.
Specifically, the enclosure rigid pile 11 and the isolation rigid pile 21 are cast-in-situ bored piles; the enclosure waterproof curtain 12 and the isolation waterproof curtain 22 are MJS high-pressure jet grouting piles, one of I-shaped steel or U-shaped steel can be adopted as the section steel 13, the section steel 13 can increase the vertical rigidity of the enclosure structure, the integrity and the stability of the enclosure structure are improved, meanwhile, the enclosure waterproof curtain can be recycled after the tunnel is completed, the strength of a protection device is increased, and meanwhile, the construction cost is reduced.
Specifically, the servo system 5 is arranged on the steel support 4 to serve as a protective measure, and when the foundation pit tends to topple towards the interior of the foundation pit, the servo system 5 can provide force towards the exterior of the foundation pit, so that the horizontal strength of the foundation pit is enhanced; meanwhile, the inserted section steel 13 is matched, and the servo system 5 avoids influence on the bridge pier of the existing viaduct due to excessive transition in the working process, so that the construction of the micro-disturbance tunnel of the bridge is realized, and the relative stability between the tunnel and the operation viaduct is increased.
Specifically, the pier foundation isolation protection structure 2 is composed of a plurality of isolation rigid piles 21 and isolation waterproof curtains 22 arranged on the outer sides among the piles; and crown beams 6 are arranged at the tops of the open cut tunnel enclosure structure main body 1 and the pier foundation isolation protection structure 2.
A construction method of a space enclosing structure for penetrating a low-clearance bridge in a close range comprises the following steps:
1) constructing pile holes along a tunnel construction line at the position adjacent to the pier 8 of the low-clearance viaduct by adopting a low-clearance machine, lowering a scalable reinforcement cage, then pouring concrete, and enclosing a rigid pile 11;
2) the outer side of the space between the enclosure rigid piles 11 is constructed by adopting a drill rod lengthening method to construct an enclosure waterproof curtain 12 in a rotary spraying mode, the rotary spraying construction is constructed by adopting a drill rod lengthening method, and the mechanical operation height is controlled by controlling the length of a single drill rod;
3) inserting section steel 13 for enhancing the rigidity of the main body of the enclosure structure into the inner side of the space between the enclosure rigid piles 11 so as to reinforce the support of soil between the piles and disperse the axial force of the steel support 4;
4) constructing pile holes along the outer side of the pier by adopting a low-altitude machine, lowering a scalable reinforcement cage, then pouring concrete, isolating a rigid pile 21, and surrounding a bridge pile 81 in the pier by matching with an open-cut tunnel enclosure structure main body 1;
5) the outer sides among the isolated rigid piles 21 are constructed with a water-stop curtain 22 through rotary spraying by adopting a drill rod lengthening method, the rotary spraying construction is constructed by adopting the drill rod lengthening method, and the mechanical operation height is controlled by controlling the length of a single drill rod;
6) simultaneously pouring a retaining rigid pile 11, a crown beam 6 at the pile top of an isolating rigid pile 21 and a first reinforced concrete support 3 of a foundation pit at the same elevation;
7) and excavating the foundation pit, constructing a reinforced concrete support 3 and a steel support 4 at the lower part to the bottom of the pit, excavating in sections, and constructing a reinforced concrete support structure 3, a steel support 4 and a corresponding servo system 5 at the corresponding section after each section of excavation is finished.
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 and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The utility model provides a closely wear envelope of low headroom bridge down which characterized in that: the bridge structure comprises an open cut tunnel enclosure structure main body (1) passing through an elevated bridge section and a bridge pier foundation isolation protection structure (2); the open cut tunnel enclosure structure main body (1) comprises a group of enclosure rigid piles (11), an enclosure waterproof curtain (12) arranged on the outer side of the enclosure rigid piles (11), and section steel (13) arranged on the inner side of the enclosure rigid piles (11) and used for enhancing the rigidity of the enclosure structure main body; a reinforced concrete support (3) and a steel support (4) are erected between enclosure rigid piles (11) in an open-cut tunnel enclosure structure main body (1); and a servo system (5) is arranged on the steel support (4).
2. A building enclosure for a short distance underpass low clearance bridge as claimed in claim 1, wherein the pier foundation isolation protection structure (2) comprises a set of isolation rigid piles (21) and isolation waterproof curtains (22) arranged outside the piles; and crown beams (6) are arranged at the tops of the open cut tunnel enclosure structure main body (1) and the pier foundation isolation protection structure (2).
3. A building enclosure for close-clearance underpass of a low clearance bridge as claimed in claim 1, wherein said open cut tunnel building enclosure body (1) is disposed between the open cut tunnel (7) and the low clearance overpass (8); the open trench tunnel (7) is penetrated with a low clear overhead bridge (8), the low clear overhead bridge (8) comprises a plurality of piers next to the open trench tunnel (7), and the piers comprise a plurality of bridge piles (81).
4. A close-range low-clearance bridge enclosure structure for penetrating downwards in accordance with claim 1, wherein the pier foundation isolation protection structure (2) is in the shape of an open frame, and the pier foundation isolation protection structure (2) surrounds the outer side of a pier and is combined with the open cut tunnel enclosure structure body (1) to form a whole.
5. A close-distance underpass low clearance bridge enclosure structure as claimed in claim 2, wherein said rigid enclosure piles (11) and said rigid isolation piles (21) are bored piles; the containment waterproof curtain (12) and the isolation waterproof curtain (22) are MJS high-pressure jet grouting piles.
6. A close-distance underpass low clearance bridge enclosure structure as claimed in claim 1 wherein said section steel (13) is one of i-section steel or U-section steel.
7. A close-distance underpass low clearance bridge enclosure as claimed in claim 1 wherein the minimum distance between the open cut tunnel enclosure body (1), the inside of the pier foundation isolation protection structure (2) and the bridge pile (81) is 3-5d, where d is the diameter of the bridge pile (81).
8. A method of constructing a building envelope for a short distance underpass of a low clearance bridge as claimed in any one of claims 1 to 7, wherein the method comprises the steps of:
1) constructing a rigid enclosure pile (11) along a tunnel construction line at a pier adjacent to the low-clearance overhead bridge (8);
2) constructing a containment waterproof curtain (12) by rotary spraying on the outer side among the piles of the containment rigid piles (11);
3) inserting section steel (13) for enhancing the rigidity of a main body of the enclosure structure into the inner side of the space between the enclosure rigid piles (11);
4) constructing an isolation rigid pile (21) along the side part of the pier, and surrounding a bridge pile (81) in the pier by matching with an open-cut tunnel enclosure structure main body (1);
5) constructing an isolation waterproof curtain (22) on the outer side among the isolation rigid piles (21) by rotary spraying;
6) simultaneously pouring a retaining rigid pile (11), a crown beam (6) for isolating the pile top of the rigid pile (21) and a first reinforced concrete support (3) of the foundation pit at the same elevation;
7) and excavating the foundation pit, constructing a reinforced concrete support (3) and a steel support (4) at the lower part to the bottom of the pit, excavating in sections, and constructing the reinforced concrete support (3), the steel support (4) and a corresponding servo system (5) at corresponding sections after each section of excavation is finished.
9. The construction method of the enclosure structure for passing through the low clearance bridge at a close distance according to claim 7, wherein: and (3) constructing by adopting a scalable reinforcement cage in the steps 1) and 4).
10. The construction method of the enclosure structure for passing through the low clearance bridge at a close distance according to claim 7, wherein: in the step 2) and the step 5), the rotary spraying construction is carried out by adopting a drill rod lengthening method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110482072.4A CN113235608A (en) | 2021-04-30 | 2021-04-30 | Enclosure structure for closely penetrating low-clearance bridge and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110482072.4A CN113235608A (en) | 2021-04-30 | 2021-04-30 | Enclosure structure for closely penetrating low-clearance bridge and construction method thereof |
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| CN113235608A true CN113235608A (en) | 2021-08-10 |
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| CN202110482072.4A Pending CN113235608A (en) | 2021-04-30 | 2021-04-30 | Enclosure structure for closely penetrating low-clearance bridge and construction method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113737814A (en) * | 2021-10-13 | 2021-12-03 | 中铁一局集团有限公司 | Construction method of subway station enclosure structure combined type enclosure pile under low clearance |
| CN114197477A (en) * | 2021-12-13 | 2022-03-18 | 中铁四局集团第四工程有限公司 | Construction method for zero-distance crossing of high-speed rail viaduct under construction deep foundation pit |
| CN114875935A (en) * | 2022-05-18 | 2022-08-09 | 上海同济工程咨询有限公司 | Foundation pit enclosure structure with limited clearance and construction method thereof |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113737814A (en) * | 2021-10-13 | 2021-12-03 | 中铁一局集团有限公司 | Construction method of subway station enclosure structure combined type enclosure pile under low clearance |
| CN114197477A (en) * | 2021-12-13 | 2022-03-18 | 中铁四局集团第四工程有限公司 | Construction method for zero-distance crossing of high-speed rail viaduct under construction deep foundation pit |
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Application publication date: 20210810 |