CN118207909A

CN118207909A - Construction method of permanent pavement structure combined with underground engineering cover-excavation construction

Info

Publication number: CN118207909A
Application number: CN202410498638.6A
Authority: CN
Inventors: 马剑飞; 张志华; 黄燕宏; 鲁稳; 陈锋
Original assignee: China Railway Major Bridge Reconnaissance and Design Institute Co Ltd
Current assignee: China Railway Major Bridge Reconnaissance and Design Institute Co Ltd
Priority date: 2024-04-24
Filing date: 2024-04-24
Publication date: 2024-06-18

Abstract

The application relates to a construction method of a permanent pavement structure combined with underground engineering cover excavation construction, which belongs to the field of underground engineering construction and comprises the following steps: removing a half-width structure and a retaining wall in a concrete support in an open cut support structure after the construction of the underground structure is completed, and constructing a concrete buttress between the underground structure and another half-width structure bearing a temporary pavement in the concrete support so as to prop up the temporary pavement; dismantling steel lattice columns below the other half-width structure of the concrete; backfilling a space above the subsurface structure with plain soil; a pouring hole is formed in the top of the temporary covering, and concrete is poured; and finally paving a surface layer at the top of the temporary pavement. According to the application, the permanent pavement is formed by directly pouring concrete on the temporary pavement and pouring the surface layer, so that the construction period is short, and the resource waste is reduced.

Description

Construction method of permanent pavement structure combined with underground engineering cover-excavation construction

Technical Field

The application relates to the field of underground engineering construction, in particular to a construction method of a permanent pavement structure combined with underground engineering cover-excavation construction.

Background

Underground works refer to civil engineering constructed deep below the ground to exploit resources in underground space. It encompasses many different kinds of buildings and facilities including underground houses, underground structures, underground railways, highway tunnels, underwater tunnels, underground common ditches, and street-crossing underground passages, etc. In general, underground engineering is a complex and diverse field that has great significance for the development of cities and the rational utilization of underground space. Through scientific planning, design and construction, the advantages of underground engineering can be fully exerted, and contribution is made to the life of people and the sustainable development of cities.

At present, a cover-excavation method is mainly adopted for construction, a temporary covering system is arranged as a traffic dispersion road or a construction site, and the cover-excavation construction can be performed in sequence or in reverse. The method is particularly suitable for constructing subway stations in urban busy zones, and can occupy less road space and reduce traffic interference.

However, after the underground engineering construction is completed, the temporary covering system needs to be broken, so that a large amount of building materials can be wasted, and meanwhile, the road restoration period is prolonged.

Disclosure of Invention

The embodiment of the application provides a construction method of a permanent pavement structure combined with underground engineering cover-excavation construction, which aims to solve the problem that a large amount of building materials are wasted by breaking a temporary covering system after the underground engineering construction is completed in the related art.

The embodiment of the application provides a construction method of a permanent pavement structure combined with underground engineering cover excavation construction, which comprises the following steps:

removing a half-width structure and a retaining wall in a concrete support in an open cut support structure after the construction of the underground structure is completed, and constructing a concrete buttress between the underground structure and another half-width structure bearing a temporary pavement in the concrete support so as to prop up the temporary pavement;

dismantling steel lattice columns below the other half-width structure of the concrete;

backfilling a space above the subsurface structure with plain soil;

A pouring hole is formed in the top of the temporary covering, and concrete is poured;

and finally, paving a top pavement surface layer on the temporary pavement:

In some embodiments, backfilling the space above the subsurface structure with subsoil, comprising: and backfilling the plain soil between the other half-frame structure and the underground structure of the concrete support, and backfilling the plain soil into the empty land on one side of the temporary pavement.

In some embodiments, the construction of concrete piers between the subsurface structure and another half-width structure bearing temporary decking in a concrete support, specifically comprises:

prefabricating the concrete buttress, and embedding a steel plate at the bottom of the concrete support;

And constructing a concrete buttress, and beating a steel wedge between the concrete buttress and the embedded steel plate.

In some embodiments, the method of constructing further comprises continuing to construct the concrete pier at the location of the steel lattice column.

In some embodiments, after pouring the concrete, and before re-paving the facing, the construction method further comprises: grouting is carried out through the filling holes for compaction.

In some embodiments, the pouring hole is filled with foam concrete.

In some embodiments, the total backfill thickness of the plain soil is between 1 meter and 1.5 meters.

In some embodiments, the facing is provided as an asphalt facing.

In some embodiments, the plain soil is backfilled while pipelining is performed.

In some embodiments, the thickness of the temporary covering is between 35mm and 45mm, and the technical scheme provided by the application has the beneficial effects that:

The embodiment of the application provides a construction method of a permanent pavement structure combined with underground engineering cover excavation construction, after an underground structure is completed, foam concrete is directly poured on the top of the temporary pavement without dismantling the temporary pavement, a new pavement structure is directly formed in a way of paving an asphalt pavement layer, the waste of building materials is effectively reduced, the thickness of the temporary pavement meets the use requirement of pavement strength, asphalt pavement is rapid and convenient, and the pavement recovery period of the pavement is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of an overall structure according to an embodiment of the present application;

FIG. 2 is a schematic diagram of a structure for showing an open trench support system according to an embodiment of the present application;

Fig. 3 is a schematic structural diagram of the open cut support system according to the embodiment of the present application after removal.

1. An underground structure; 2. temporarily covering; 3. pouring holes; 30. foam concrete; 4. a surface layer; 50. supporting piles; 51. steel lattice columns; 60. a concrete support; 61. a retaining wall; 70. a concrete crown beam; 71. a concrete connecting beam; 8. a concrete buttress; 9. backfilling the area; 90. plain soil.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

The embodiment of the application provides a permanent pavement construction method combined with underground engineering cover-excavation construction, which can solve the problem that a large amount of building materials are wasted by breaking a temporary covering system after the underground engineering construction is completed.

Referring to fig. 1 to 3, in the present application, before the completion of the underground engineering construction, it is necessary to improve the support system of the underground structure 1, the support system of the underground structure 1 includes a foundation pit support system, an open cut support system, a concrete beam support system, and a temporary covering 2; the foundation pit supporting system comprises supporting piles 50 and steel lattice columns 51, wherein the supporting piles 50 are cast-in-place piles, and the cast-in-place piles are distributed side by side along the construction paying-off positions and are enclosed on the periphery of the underground foundation pit; the steel lattice column 51 is a building form composed of smaller cross-section members, has the advantages of strong bending resistance and material saving, the steel lattice column 51 is mainly distributed between two adjacent rows of support piles 50, and a plurality of steel lattice columns are also distributed along an underground foundation pit;

secondly, the open cut support system comprises a concrete support 60 and a retaining wall 61, wherein the concrete support 60 is positioned at the top of the steel lattice column 51, a steel plate is pre-embedded at the bottom of the concrete support 60, the steel lattice column 51 is welded with the steel plate, and the retaining wall 61 is arranged on one side of the concrete support 60 in a surrounding manner and is connected with the steel lattice column 51;

The concrete beam supporting system comprises a concrete connecting beam 71 and a concrete crown beam 70, wherein the concrete crown beam 70 is arranged at the top of the supporting piles 50, all the supporting piles 50 are connected together to prevent collapse concrete from being generated at the edge of the top of a foundation pit, two ends of the concrete support 60 are respectively connected with two adjacent rows of the concrete crown beams 70, and the concrete connecting beam 71 is intersected with the steel lattice columns 51 to ensure smooth, stable and reliable force transfer between the two;

Temporary blanket 2 is laid on top of concrete support 60.

Referring to fig. 1 to 3, an embodiment of the present application provides a construction method of a permanent pavement structure for underground engineering cover excavation construction, including the following steps:

Removing a half-width structure and a retaining wall 61 in a concrete support 60 in an open cut support structure after the construction of the underground structure 1 is completed, and constructing a concrete buttress 8 between the underground structure 1 and the other half-width structure bearing a temporary pavement 2 in the concrete support 60 so as to prop the temporary pavement 2;

dismantling the steel lattice columns 51 under the other half-frame structure of the concrete 60;

backfilling the space above the subterranean structure 1 with a subsoil 90;

A pouring hole 3 is formed in the top of the temporary pavement 2, and concrete is poured;

And finally paving a surface layer 4 on the top of the temporary pavement 2.

It can be seen that in the present application, after the construction of the underground structure 1, the half frame structure in the removed concrete support 60 and a part of the material in the retaining wall 61 can be recycled, thereby reducing the waste of the construction material. Finally, the surface layer 4 is paved through the poured concrete, so that the permanent pavement is directly constructed on the underground structure 1, the waste of data is reduced, and the pavement restoration construction can be accelerated.

It should be noted that the removal of the concrete support 60 and retaining wall 61 is a complex and risky process and therefore, prior to removal, a comprehensive safety assessment and detailed removal scheme must be made. In the dismantling process, the supporting structure at the top is dismantled first and then the supporting structure below is dismantled layer by layer according to the sequence from top to bottom, from stable to unstable and from strong to weak. Meanwhile, the safety protection measures in the dismantling process are ensured to be in place, and safety accidents such as collapse and falling are prevented.

Next, the earth 90 is backfilled on the underground structure 1 in order to restore the stability and flatness of the ground. Before backfilling, sundries and vegetation in the backfill area 9 should be cleaned, so that the backfill area 9 is ensured to be clean and smooth. In the backfilling process, the quality and uniformity of the backfill 90 should be controlled to avoid problems such as uneven settlement or voids. Meanwhile, compaction and leveling are carried out layer by layer, so that connectivity and stability of backfill soil and surrounding soil are ensured.

In the present application, the backfilling of the plain soil 90 into the space above the underground structure 1 specifically includes: the construction steps are quick and compact by backfilling the soil 90 between the other half-frame structure of the concrete support 60 and the underground structure 1 and backfilling the soil 90 into the empty space on one side of the temporary cover 2.

In some alternative embodiments, referring to fig. 3, since steel lattice columns 51 generally serve as temporary support structures for providing stability and support during construction of subterranean structure 1, steel lattice columns 51 are not required once construction of subterranean structure 1 is complete. In the present application, therefore, the construction of a concrete pier 8 between an underground structure 1 and another half-frame structure carrying temporary decking 2 in a concrete support 60, comprises in particular:

Prefabricating the concrete buttress 8, and embedding a steel plate at the bottom of the concrete support 60;

And constructing the concrete buttress 8, and beating steel wedges between the concrete buttress 8 and the embedded steel plates, wherein a gap exists between the prefabricated concrete buttress 8 and the concrete support 60, and the steel wedges are beaten to fill the gap so as to ensure force transmission.

In some alternative embodiments, the construction method further comprises continuing to construct the concrete piers 8 at the positions of the steel lattice columns 51, and after the steel lattice columns 51 are removed, continuing to cast the concrete piers 8 on the original positions of the steel lattice columns 51 so as to improve the support stability of the temporary cover 2, and the underground structure 1 is stable and reliable.

In some alternative embodiments, referring to fig. 2 and 3, after pouring the concrete, the construction method further comprises, before the laying of the face layer 4: through pouring into hole 3 slip casting closely knit, pour into after the hole 3 in pouring into concrete and can, in order to improve closely knit degree still need further just to carry out slip casting closely knit, and then improve intensity.

In some alternative embodiments, referring to fig. 3, foam concrete 30, also called light concrete, is a porous material with a porous structure, and is formed by mixing and stirring cement, water, foaming agent and other materials according to a certain proportion. It has the advantages of light weight, good heat preservation and insulation performance, etc.

In some alternative embodiments, referring to FIG. 3, the total backfill thickness of plain soil 90 of the present application is between 1 meter and 1.5 meters, preferably 1 meter. And the plain soil 90 can be backfilled and simultaneously the pipeline laying can be performed, so that the construction period is effectively saved.

In some alternative embodiments, referring to fig. 3, the facing layer 4 is provided as an asphalt facing layer 4, the asphalt facing layer 4 having an asphalt mixture with good water resistance and crack resistance properties.

In some alternative embodiments, see fig. 3, the temporary cover 2 has a thickness of between 35mm and 45mm, preferably 40mm, and the temporary cover 2 meets the permanent road strength requirement, so that the formed permanent road structure is firm.

In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of describing the present application and simplifying the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be constructed and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

It should be noted that in the present application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

The foregoing is only a specific embodiment of the application to enable those skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. The construction method of the permanent pavement structure combined with the underground engineering cover excavation construction is characterized by comprising the following steps of:

Removing a half-frame structure and a retaining wall (61) in a concrete support (60) in an open cut support structure after the construction of the underground structure (1) is completed, and constructing a concrete buttress (8) between the underground structure (1) and the other half-frame structure bearing a temporary pavement (2) in the concrete support (60) so as to prop up the temporary pavement (2);

-dismantling the steel lattice columns (51) under the other half-frame structure of the concrete (60);

Backfilling a space above the subsurface structure (1) with earth (90);

A pouring hole (3) is formed in the top of the temporary covering (2), and concrete is poured;

and finally paving a surface layer (4) on the top of the temporary pavement (2).

2. The construction method of a permanent pavement structure in combination with underground engineering cover excavation construction according to claim 1, wherein: backfilling a space above the underground structure (1) with earth (90), comprising in particular: and backfilling plain soil (90) between the other half-frame structure of the concrete support (60) and the underground structure (1), and backfilling plain soil (90) into the empty land at one side of the temporary cover (2).

3. The construction method of a permanent pavement structure in combination with underground engineering cover excavation construction according to claim 1, wherein: -constructing a concrete buttress (8) between said underground structure (1) and a further half-frame structure carrying a temporary covering (2) in a concrete support (60), comprising in particular:

prefabricating the concrete buttress (8) and embedding a steel plate at the bottom of the concrete support (60);

and constructing a concrete buttress (8), and beating a steel wedge between the concrete buttress (8) and the embedded steel plate.

4. The construction method of a permanent pavement structure in combination with underground engineering cover excavation construction according to claim 1, wherein: the construction method further comprises the step of continuing to construct the concrete buttress (8) at the position of the steel lattice column (51).

5. The construction method of a permanent pavement structure in combination with underground engineering cover excavation construction according to claim 1, wherein: after pouring the concrete, before laying the surface layer (4), the construction method further comprises: grouting is compact through the grouting holes (3).

6. The construction method of a permanent pavement structure in combination with underground engineering cover excavation construction according to claim 1, wherein: foam concrete (30) is poured into the pouring holes (3).

7. The construction method of a permanent pavement structure in combination with underground engineering cover excavation construction according to claim 1, wherein: the total backfill thickness of the plain soil (90) is between 1 and 1.5 meters.

8. The construction method of a permanent pavement structure in combination with underground engineering cover excavation construction according to claim 1, wherein: the surface layer (4) is an asphalt surface layer (4).

9. The construction method of a permanent pavement structure in combination with underground engineering cover excavation construction according to claim 1, wherein: and backfilling the plain soil (90) and simultaneously laying pipelines.

10. The construction method of a permanent pavement structure in combination with underground engineering cover excavation construction according to claim 1, wherein: the thickness of the temporary covering (2) is between 35mm and 45 mm.