阅读说明：本技术 一种基坑支护结构 (Foundation pit supporting structure ) 是由 李长安 国斌 罗章波 郎瑶 刘雪斌 黄新连 高煌 李平定 刘力 周丁恒 顾翔 于 2020-06-24 设计创作，主要内容包括：本发明涉及建筑工程技术领域,具体地,涉及一种基坑支护结构。该基坑支护结构包括多个附属围护桩和多个钢支撑；多个所述附属围护桩设置于附属基坑背离主体结构的一侧,并与主体围护桩相对设置；所述钢支撑支承于所述附属围护桩与所述主体结构的主体二衬过梁之间。上述基坑支护结构采用主体结构的二衬过梁作为钢支撑的内部支点,保证了钢支撑的传力平衡,很好的解决了钢支撑的架设难题；上述基坑支护结构具有传力明确、施工方便、工期短、造价低、对周边环境影响较小的优点。(The invention relates to the technical field of constructional engineering, in particular to a foundation pit supporting structure. The foundation pit supporting structure comprises a plurality of auxiliary fender posts and a plurality of steel supports; the auxiliary fender posts are arranged on one side, away from the main body structure, of the auxiliary foundation pit and are arranged opposite to the main body fender posts; the steel support is supported between the auxiliary fender post and the main body secondary lining beam of the main body structure. The foundation pit supporting structure adopts the two lining lintels of the main structure as the internal pivot of the steel support, thereby ensuring the force transmission balance of the steel support and well solving the erection difficulty of the steel support; the foundation pit supporting structure has the advantages of definite force transfer, convenience in construction, short construction period, low manufacturing cost and small influence on the surrounding environment.)

1. A foundation pit supporting structure is characterized by comprising a plurality of auxiliary fender piles and a plurality of steel supports;

the auxiliary fender posts are arranged on one side, away from the main body structure, of the auxiliary foundation pit and are arranged opposite to the main body fender posts;

the steel support is supported between the auxiliary fender post and the main body secondary lining beam of the main body structure.

2. The foundation pit supporting structure according to claim 1, wherein a plurality of the auxiliary fender piles are uniformly distributed along the length direction of the auxiliary foundation pit;

the auxiliary fender posts and the steel supports are in one-to-one correspondence.

3. The foundation pit supporting structure according to claim 1, wherein an auxiliary crown beam is provided on top of a plurality of the auxiliary fender piles;

the auxiliary crown beam and the plurality of auxiliary fender piles form an integral structure.

4. A foundation pit supporting construction according to claim 3, wherein a retaining wall is provided at the top of the appurtenant crown beam and between the appurtenant fender posts.

5. The foundation pit supporting structure according to claim 1, wherein flanges are arranged at both ends of the steel support;

mounting seats are arranged on the auxiliary fender post and the main body secondary lining lintel, and the mounting seats are used for being butted with the flange plate;

the flange plate is fixedly arranged on the mounting seat through bolts.

6. The foundation pit supporting structure according to claim 5, wherein a safety rope is provided at an end of the steel support;

the mounting seat is provided with a buckle for quickly connecting the safety rope.

7. The foundation pit supporting structure according to any one of claims 1 to 6, wherein a structural reinforcement for enhancing the structural strength and rigidity of the main body secondary lining beam is added in the main body secondary lining beam.

8. The excavation supporting structure of claim 7, wherein the structural reinforcement includes a support steel plate embedded in a side of the main body secondary backing beam facing the steel support.

9. The foundation pit support structure of claim 8, wherein the structural reinforcement further comprises stirrups for shearing in the horizontal and vertical directions.

10. The foundation pit supporting structure according to claim 7, wherein an upward flange is provided on the top of the main body secondary lining beam.

Technical Field

The application relates to the technical field of constructional engineering, in particular to a foundation pit supporting structure.

Background

In urban rail transit engineering, open cut method station foundation ditch usually adopts fender pile + steel shotcrete supporting construction form, need set up multichannel steel shotcrete when the foundation ditch is darker, and steel shotcrete frame establishes on the waist rail, and the waist rail supports on fender pile to guarantee foundation ditch stress balance. For the auxiliary foundation pit, a fender post between the main body of the station and the auxiliary structure is dug and chiseled. The auxiliary foundation pit is influenced by the surrounding environment, if a relatively close building (structure) exists, the problem that the steel support cannot be erected exists when the foundation pit is arranged in a form parallel to the length direction of the station and is in a long and narrow shape, and the arrangement form of the steel support needs to be adjusted to ensure the stress balance of the foundation pit.

Disclosure of Invention

The embodiment of the application provides a convenient to be under construction, to the less foundation ditch supporting construction of surrounding environment influence, solves the problem that the steel shotcrete of current long and narrow subsidiary foundation ditch can't erect.

The embodiment of the application provides a foundation pit supporting structure which comprises a plurality of auxiliary fender piles and a plurality of steel supports;

the auxiliary fender posts are arranged on one side, away from the main body structure, of the auxiliary foundation pit and are arranged opposite to the main body fender posts;

the steel support is supported between the auxiliary fender post and the main body secondary lining beam of the main body structure.

Preferably, a plurality of auxiliary fender piles are uniformly distributed along the length direction of the auxiliary foundation pit;

the auxiliary fender posts and the steel supports are in one-to-one correspondence.

Preferably, an auxiliary crown beam is arranged on the top of a plurality of auxiliary fender piles;

the auxiliary crown beam and the plurality of auxiliary fender piles form an integral structure.

Preferably, retaining walls are provided on top of the satellite crown beams and between the satellite fender posts.

Preferably, flanges are arranged at two ends of the steel support;

mounting seats are arranged on the auxiliary fender post and the main body secondary lining lintel, and the mounting seats are used for being butted with the flange plate;

the flange plate is fixedly arranged on the mounting seat through bolts.

Preferably, a safety rope is arranged at the end part of the steel support;

the mounting seat is provided with a buckle for quickly connecting the safety rope.

Preferably, a structural reinforcing member for enhancing the structural strength and rigidity of the main body secondary lining beam is added in the main body secondary lining beam.

Preferably, the structural reinforcement comprises a supporting steel plate, and the supporting steel plate is embedded at one side of the main body secondary lining beam facing the steel support.

Preferably, the structural reinforcement further comprises stirrups for shearing in the horizontal and vertical directions.

Preferably, an upward flange is arranged on the top of the second main body lining beam.

The foundation pit supporting structure provided in the embodiment of the application has the following beneficial effects:

in the foundation pit supporting structure, a plurality of auxiliary fender posts are arranged on the outer side of an auxiliary foundation pit, the steel support is supported between the auxiliary fender posts and the main body second lining lintel of the main body structure, the main body structure second lining lintel is used as an internal fulcrum of the steel support, the force transmission balance of the steel support is ensured, the difficult problem of erecting the steel support is well solved, the deformation and the surface subsidence of the foundation pit can be effectively controlled through the steel support, and the safety of peripheral building (structure) is protected, so the foundation pit supporting structure has the advantages of definite force transmission, convenience in construction, short construction period, low manufacturing cost and small influence on the peripheral environment.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the application and together with the description serve to explain the application and not to limit the application. In the drawings:

fig. 1 is a schematic structural diagram of a foundation pit supporting structure provided in an embodiment of the present application;

fig. 2 is a schematic structural view of the foundation pit supporting structure provided in fig. 1 before the steel supports are arranged;

fig. 3 is a schematic structural view after the auxiliary structure is constructed.

Reference numerals:

1-auxiliary fender posts; 2-supporting steel; 3-auxiliary foundation pit; 4-main body fender post; 5-main body structure; 6-body two lining beam; 7-auxiliary crown beam; 8-a retaining wall; 9-flanging; 10-surrounding buildings (structures); 11-construction of the ground.

Detailed Description

In order to make the technical solutions and advantages of the embodiments of the present application more apparent, the following further detailed description of the exemplary embodiments of the present application with reference to the accompanying drawings makes it clear that the described embodiments are only a part of the embodiments of the present application, and are not exhaustive of all embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The embodiment of the application provides a foundation pit supporting structure, which can be applied to the construction process of urban rail transit engineering, and as shown in structures shown in fig. 1, 2 and 3, the foundation pit supporting structure comprises a plurality of auxiliary fender posts 1 and a plurality of steel supports 2; a plurality of auxiliary fender posts 1 are arranged on one side of the auxiliary foundation pit 3, which is far away from the main body structure 5, and are arranged opposite to the main body fender posts 4; the steel bracing 2 is supported between the satellite fender post 1 and the main body secondary backing beam 6 of the main body structure 5. As shown in fig. 1, 2 and 3, due to the construction of the auxiliary structure connected to the main structure 5, an auxiliary foundation pit 3 needs to be excavated on one side of the main structure 5, and a peripheral building 10 is provided on one side of the excavated auxiliary foundation pit 3, and is influenced by the peripheral environment, and the auxiliary foundation pit 3 is parallel to the length direction of the main structure 5 and has a long and narrow shape; before the auxiliary foundation pit 3 is excavated, in order to effectively control the deformation and the ground surface settlement of the foundation pit, ensure that nearby peripheral buildings (structures) 10 are not influenced and ensure the construction safety, a plurality of auxiliary fender posts 1 are required to be prepared at the lower part of a construction ground 11 in advance, the auxiliary fender posts 1 can be arranged opposite to a main body fender post 4 when a main body structure 5 is constructed, and a narrow space between the main body fender post 4 and the auxiliary fender post 1 is used for forming the auxiliary foundation pit 3; along the length direction of appurtenant foundation ditch 3, a plurality of appurtenant fender posts 1 evenly distributed, namely, be provided with a plurality of appurtenant fender posts 1 at the side of appurtenant foundation ditch 3 that deviates from major structure 5, the interval between appurtenant fender posts 1 equals. In order to further improve the supporting stability and safety of the foundation pit supporting structure, the pile diameter of the auxiliary fender posts 1 can be increased according to actual conditions, the distance between the auxiliary fender posts 1 can be reduced to improve the density of the auxiliary fender posts 1, and the embedding depth of the auxiliary fender posts 1 can be improved.

In the above-mentioned foundation pit supporting structure, be provided with a plurality of appurtenant fender posts 1 in the outside of appurtenant foundation pit 3, and support steel shotcrete 2 between appurtenant fender post 1 and the two lining lintels 6 of main part structure 5's main part, adopt the two lining lintels of main part structure 5 as the inside fulcrum of steel shotcrete 2, guaranteed the power transmission balance of steel shotcrete 2, fine solution steel shotcrete 2 erect the difficult problem, can control foundation pit deformation and earth's surface subsidence effectively through steel shotcrete 2, protect peripheral building (structure) 10 safety, therefore, above-mentioned foundation pit supporting structure has the advantages that passes the power clearly, construction convenience, the time limit for a project is short, the cost is low, it is less to influence on peripheral environment.

In a specific embodiment, the auxiliary fender piles 1 correspond to the steel supports 2 one by one, that is, one steel support 2 is arranged between the main body secondary lining beam 6 of the main body structure 5 and each auxiliary fender pile 1, so that a supporting structure with a stable structure is formed around the auxiliary foundation pit 3, and the structural strength and rigidity of the supporting structure are improved. Meanwhile, in order to further improve the strength and rigidity of the enclosure structure, as shown in the structure of fig. 1, the auxiliary crown beams 7 are arranged at the tops of the plurality of auxiliary enclosure piles 1, the auxiliary crown beams 7 and the plurality of auxiliary enclosure piles 1 form an integrated structure, and the plurality of auxiliary enclosure piles 1 are fixedly connected into a whole through the auxiliary crown beams 7 at the tops of the auxiliary enclosure piles 1, so that the improvement of the fixed foundation of the steel support 2 is facilitated.

While forming the supporting frame by the plurality of auxiliary retaining piles 1 and the auxiliary crown beams 7, as shown in the structure of fig. 1, retaining walls 8 are arranged at the tops of the auxiliary crown beams 7 and between the auxiliary retaining piles 1, the protective performance of the foundation pit supporting structure can be further improved by the retaining walls 8 arranged between the retaining walls 8 at the tops of the auxiliary crown beams 7 and the auxiliary retaining piles 1, the safety and reliability of the construction environment in the auxiliary foundation pits 3 are ensured, and accidents such as soil body sliding and collapse are prevented.

In order to facilitate the assembly of the steel support 2, the auxiliary fender post 1 and the main body second lining lintel 6, flanges (not shown in the figure) can be arranged at both ends of the steel support 2, mounting seats (not shown in the figure) corresponding to the flanges one by one are arranged on the auxiliary fender post 1, the flanges and the mounting seats are connected in one-to-one correspondence, and the flanges are fixedly mounted on the corresponding mounting seats through bolts penetrating through the flanges.

Simultaneously, in order to further improve the security of steel shotcrete 2 in the installation, can also be provided with safety rope (not shown in the figure) respectively at the both ends of steel shotcrete 2 to be provided with the buckle corresponding with safety rope on the mount pad of attached fender post 1 and main part two lining lintel 6, can realize the quick dismantlement of safety rope through the buckle, can further improve the risk that steel shotcrete 2 dropped in the installation through tying of safety rope, prevent to take place the incident because of the steel shotcrete drops.

When the auxiliary fender post 1 and the steel support 2 are reinforced, a structural reinforcing piece for enhancing the structural strength and rigidity of the main body secondary lining lintel 6 can be additionally arranged in the main body secondary lining lintel 6, compared with the prior art, the main body secondary lining lintel 6 not only serves as a support frame of the main body structure 5, but also provides a fulcrum for the steel support 2 in the foundation pit supporting structure of the auxiliary foundation pit 3, and therefore, the structural strength and rigidity of the main body secondary lining lintel 6 need to be improved.

The structural strength and rigidity of the secondary body lintel 6 can be further improved by the structural reinforcement provided in the secondary body lintel 6 while satisfying the use strength.

The structural reinforcement may comprise a supporting steel plate (not shown in the drawings), and the supporting steel plate is embedded on the side of the main body secondary lining beam 6 facing the steel support 2 so as to meet the structural strength and rigidity requirements of the main body secondary lining beam 6 for supporting the steel support 2.

The structural reinforcement may further include stirrups (not shown in the drawings) for shearing in the horizontal direction and the vertical direction, and the ability of the main body secondary backing beam 6 to shear in the horizontal direction and the vertical direction may be improved by the stirrups provided in the main body secondary backing beam 6.

An upward flange 9 is arranged at the top of the main body second lining beam 6, so that the steel support 2 of the auxiliary structure can be conveniently erected. The section size and the reinforcing bars of the main body second lining lintel 6 need to meet the requirements of flexural and shear bearing capacity, and the specification of the vertical side waist bar can be increased.

When the foundation pit supporting structure is adopted for constructing the auxiliary structure, as shown in the structure of fig. 2, before the auxiliary foundation pit 3 is excavated, in order to construct the main structure 5, a main body guard post 4 for supporting is arranged around the main body foundation pit, in order to support the excavated auxiliary foundation pit 3, a plurality of auxiliary guard posts 1 are pre-embedded at one side of the auxiliary foundation pit 3, which is far away from the main body guard post 4, the plurality of auxiliary guard posts 1 are arranged at intervals along the length direction of the auxiliary foundation pit 3, and an auxiliary crown beam 7 and a retaining wall 8 can be arranged at the top of the auxiliary guard posts 1; after the auxiliary fender piles 1 are prepared, as shown in the structure of fig. 1, excavating an auxiliary foundation pit 3, excavating and chiseling main body fender piles 4, crown beams and a retaining wall 8 formed between the main body fender piles 4 in the excavating process, erecting steel supports 2 between the auxiliary fender piles 1 and the main body secondary lining beam 6 after the main body secondary lining beam 6 is exposed, and enabling one ends of the steel supports 2 to be supported on the auxiliary fender piles 1 and the other ends to be supported on the main body secondary lining beam 6; after all the steel supports 2 are constructed, the auxiliary foundation pits 3 are excavated, the main body guard piles 4 and the retaining walls 8 between the main body guard piles are dug along with the excavation until the auxiliary foundation pits 3 are excavated, and the auxiliary structures connected with the main body structures 5 are constructed in the auxiliary foundation pits 3 continuously, as shown in the structure of fig. 3.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.