Support system and construction method of underground communication structure

Abstract

According to the supporting system and the construction method of the underground communicating structure, the top plate of the underground communicating structure is preferentially closed by adopting the top-down construction sequence, compared with an existing bottom-up construction sequence, a working face can be delivered to a related unit in advance to conduct construction on the portion above the underground communicating structure, and the construction period is shortened; a middle partition pile shared between two basement structures serves as a main vertical stress component of a supporting system of an underground communication structure, second supporting pieces for bearing a bottom die of a top plate of the underground communication structure are installed at the top of the middle partition pile, and two triangular supporting frames are fixedly arranged at the bottoms of the second supporting pieces located on the two sides of the middle partition pile; according to the construction method, the construction of the supporting system for the formworks of all the laminates of the underground communication structure is completed, the whole supporting system construction process is simple, the structural stability is high, the overall construction time of the underground communication structure is shortened, the construction cost is reduced, and meanwhile potential safety hazards caused by a narrow space or a closed space are reduced.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a construction method for a support system and underground connection structure. Background Technology

[0002] With the increasingly rapid pace of urban construction, the interconnection of underground structures across multiple plots or the creation of multiple sub-pits are becoming more widespread, leading to stricter timeline requirements from construction companies. Projects involving interconnected underground structures across multiple plots or multiple sub-pits often require the separation of foundation pits or plots due to the construction company's operational goals and the surrounding environment. After the underground structures on adjacent sides are completed, the connecting underground structures between the two adjacent underground structures are then constructed to achieve the desired connection between the underground structures of multiple plots.

[0003] Please refer to Figures 1a to 1f The construction process of the existing underground connection structure is described in detail below:

[0004] After the underground structures on both sides are completed, the basement structures on both sides of the location of the underground connecting structure to be constructed are first moved to ±0.000. Then, the central diaphragm pile 11' is removed down to below the bottom slab. Next, the bottom slab of the underground connecting structure is constructed and cured until it reaches the design strength. Then, a formwork frame 1' is erected on the bottom slab to construct the middle slab of the underground connecting structure and cured until it reaches the design strength. Next, a formwork frame 1' is erected on the middle slab to construct the top slab of the underground connecting structure. Until the underground connecting structure reaches ±0.000, all the formwork frames 1' erected (in the current project, this includes the first and second basement levels) are removed.

[0005] In the above-mentioned construction method for underground connecting structures, all central diaphragm piles (elevation -3.200 to -15.450) need to be removed before proceeding step-by-step from bottom to top: "bottom slab → middle slab → top slab → handover of the top slab working surface". This construction procedure has the following shortcomings:

[0006] (1) Long construction period: This mainly refers to the late handover of the top slab of the underground connecting structure to the working face; secondly, according to the existing technical practice, the underground connecting structure can only be erected after the central diaphragm piles are removed and cleaned. In addition, the underground connecting structure slab is relatively thick, and the space for erecting the formwork is limited. It is necessary to increase the density of the uprights of the erected formwork to improve the stability support, which reduces the erection efficiency.

[0007] (2) The narrow operating surface leads to reduced construction efficiency: for example, Figure 2 As shown, the masonry of the basement wall on the east side of the underground connecting structure has been completed, but the formwork scaffolding for the basement floor slab on the west side has not been removed, which will result in a narrow working area. The hoisting of materials and the operation of personnel in this area are restricted, thus resulting in low efficiency.

[0008] (3) Construction in a confined space poses significant safety hazards: the underground connecting structure is long and narrow, with limited space, increasing construction risks. Those skilled in the art have been seeking solutions to address the shortcomings of existing construction methods for underground connecting structures. Summary of the Invention

[0009] The purpose of this invention is to provide a construction method for a support system and underground connection structure, which can save construction time, reduce costs, and reduce safety hazards.

[0010] The present invention provides a support system comprising: a first support member, a second support member, and two triangular support frames. The second support member is vertically disposed at one end of the first support member, and the two triangular support frames are fixedly disposed at the bottom of the second support member located on both sides of the first support member.

[0011] Optionally, in the aforementioned support system, the first support member is a central support pile shared by adjacent plots.

[0012] Optionally, in the support system, the second support member is a channel steel or an I-beam.

[0013] Optionally, in the support system, each triangular support frame is a steel triangular support frame.

[0014] Optionally, in the support system, each triangular support frame is rigidly connected to the second support member.

[0015] Optionally, in the support system, each triangular support frame is a right-angled triangular support frame.

[0016] Optionally, in the support system, two triangular support frames symmetrically clamp the first support member.

[0017] The present invention also provides a construction method for an underground interconnection structure, the construction method comprising:

[0018] After the underground connecting structure on both sides of the construction site is constructed to the design reference elevation ±0.000, the central diaphragm pile shared between the two underground structures is cut to the first distance below the bottom elevation of the top slab of the lower underground structure.

[0019] Install the second support member of the bottom formwork of the top plate of the underground connecting structure on the top of the current central diaphragm pile, and fix two triangular support frames at the bottom of the second support members located on both sides of the central diaphragm pile to complete the construction of the support system for the top plate of the underground connecting structure.

[0020] Construction of the top slab of the underground connecting structure is carried out, and the top slab of the underground connecting structure is cured until it reaches the design strength. The working surface above the top slab of the underground connecting structure can then be handed over.

[0021] Cut the central diaphragm pile to the second distance below the bottom elevation of the middle slab of the lower side basement;

[0022] Install the second support component of the bottom formwork of the underground connecting structure slab on the top of the current central diaphragm pile, and fix two triangular support frames at the bottom of the second support component located on both sides of the central diaphragm pile to complete the construction of the support system for the underground connecting structure slab; carry out the construction of the underground connecting structure slab, and carry out the curing of the underground connecting structure slab until it reaches the design strength.

[0023] Remove the remaining central diaphragm piles, construct the base slab of the underground connecting structure, and cure the base slab until it reaches the design strength.

[0024] Optionally, in the construction method of the underground connecting structure, the first distance is set according to the thickness of the bottom formwork of the top slab of the underground connecting structure and the thickness of the second support member; the second distance is set according to the thickness of the bottom formwork of the middle slab of the underground connecting structure and the thickness of the second support member.

[0025] Optionally, in the construction method of the underground connecting structure, the first distance and the second distance are both within the range of 20cm to 30cm.

[0026] Optionally, in the construction method of the underground connecting structure, the spacing between the two triangular support frames on the same side of two adjacent central diaphragm piles is set at least according to the slab thickness, reinforcement and load parameters of the underground connecting structure.

[0027] Optionally, in the construction method of the underground connecting structure, the distance between the two triangular support frames on the same side of two adjacent central diaphragm piles is less than or equal to 1.8m.

[0028] The construction method for the support system and underground connection structure provided by this invention has at least the following features:

[0029] Beneficial effects:

[0030] 1) The construction method of the underground connecting structure of the present invention adopts a top-down construction sequence and prioritizes the sealing of the top slab of the underground connecting structure. Compared with the bottom-up construction sequence in the prior art, the working surface can be handed over to the relevant unit in advance for construction above the underground connecting structure (such as the part above the top slab being a municipal road, which can be covered with soil in advance), thus shortening the construction period.

[0031] 2) Based on the central diaphragm pile shared between the two basement structures as the main vertical load-bearing component of the support system for the underground connecting structure, a second support component bearing the bottom formwork of the top slab of the underground connecting structure is installed on the top of the central diaphragm pile. Two triangular support frames are fixedly set at the bottom of the second support components located on both sides of the central diaphragm pile to complete the construction of the support system for the formwork of each floor slab of the underground connecting structure. The entire support system construction process is simple, easy to operate, and has strong structural stability. Compared with erecting scaffolding on each floor as the formwork support system, it effectively shortens the overall construction time of the connecting structure, reduces safety hazards caused by narrow or enclosed spaces, solves the problems of long construction period and greater safety hazards when using conventional construction methods for zoned construction, and effectively reduces construction costs. Attached Figure Description

[0032] The above and other objects, features and advantages of this disclosure will become more apparent from the accompanying drawings, in which like reference numerals generally denote like parts.

[0033] Figures 1a to 1f This is a schematic diagram of each step in the construction method of existing underground interconnected structures;

[0034] Figure 2 This is a construction site diagram illustrating the construction of an underground interconnection structure using existing construction methods.

[0035] Figure 3 This is a flowchart of a construction method for an underground interconnection structure according to an embodiment of the present invention;

[0036] Figures 4a to 4f This is a schematic diagram of each step in the construction method of the underground interconnection structure in one embodiment of the present invention;

[0037] Figure 5 yes Figure 4a A magnified view of a portion of the image;

[0038] Figure 6 This is a schematic diagram of the support system in one embodiment of the present invention.

[0039] Figures 1a to 1f In the middle: 11' - central diaphragm pile; 1' - formwork frame;

[0040] Figures 4a-5In the middle: 1-Support system; 11-First support component; 12-Second support component; 13-Triangular support frame; 20-Bottom formwork of the top slab of the underground connecting structure; 201-Timber; 202-Plywood; 21-Top slab of the underground connecting structure; 22-Middle slab of the underground connecting structure; 23-Bottom slab of the underground connecting structure; 3-First basement; 31-Top slab of the first basement; 32-Middle slab of the first basement; 4-Second basement; 41-Top slab of the second basement; 42-Middle slab of the second basement; 43-Structural column of the second basement. Detailed Implementation

[0041] The construction method of the support system and underground connection structure proposed in this invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of this invention will become clearer from the following description and claims. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of this invention.

[0042] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0043] In the description of the invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0044] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0045] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Please refer to Figure 5 and Figure 6 The support system 1 includes: a first support member 11, a second support member 12 and two triangular support frames 13. The second support member 12 is vertically disposed at one end of the first support member 11, and the two triangular support frames 13 are fixedly disposed at the bottom of the second support member 12 located on both sides of the first support member 11.

[0047] Triangular support frames 13 are set on both sides of the first support member 11, and the triangular support frames 13 are rigidly connected to the second support member 12, which effectively enhances the cantilever end bearing capacity of the second support member 12 and forms a three-dimensional stable system.

[0048] In this embodiment, the first support member 11 is a central partition pile shared by adjacent plots; the second support member 12 is a channel steel or an I-beam.

[0049] In this embodiment, each triangular support frame 13 is made of steel and is rigidly connected to the second support member 12. The triangular support frame 13 effectively enhances the cantilever end bearing capacity of the second support frame 12, forming a three-dimensional stable system. Based on the axial force design of the triangular support frame 13 through standardized triangular units, combined with high-strength materials and rigid node construction, it achieves high stability and high load-bearing capacity structural performance. It is a core support component for controlling deformation and transferring loads in engineering, and its design must strictly follow the specifications to ensure that the strength, stiffness, and stability indicators meet the requirements.

[0050] like Figure 6 As shown, in this embodiment, each triangular support frame 13 is a right-angled triangular support frame, and two triangular support frames 13 symmetrically clamp the first support member 11.

[0051] Accordingly, this embodiment also provides a construction method for an underground interconnection structure. See below for reference. Figures 4a to 5 This embodiment details the construction method of the underground connecting structure. Here, the first support member 11 is a central diaphragm pile shared between the two basement structures.

[0052] First, please refer to Figure 4a , Figure 4bIn step S1, after the basement structures on both sides of the location of the underground connecting structure to be constructed are constructed to the design reference elevation ±0.000, the central diaphragm pile shared between the two basement structures is cut to a first distance below the bottom elevation of the top slab of the lower basement. Preferably, a static cutting method is used to cut the predetermined position of the pile head of the central diaphragm pile to form a flat bearing surface for installing the second support component.

[0053] Specifically, for example, the basements on both sides of the location of the underground connecting structure to be constructed are designated as Basement 3 (First Basement) and Basement 4 (Second Basement), with Basement 3 being the lower basement compared to Basement 4. Basement 3, once completed, includes a floor slab, a middle slab 32, a roof slab 31, and structural columns; Basement 4, once completed, includes a floor slab, a middle slab 42, a roof slab 41, and structural columns 43. The specific structure of the basements is an existing structure and will not be elaborated upon here.

[0054] The first distance is set based on the thickness of the bottom formwork 20 of the top slab of the underground connecting structure and the thickness of the second support member 12. Specifically, the first distance is equal to the sum of the thickness of the bottom formwork 20 of the top slab of the underground connecting structure and the thickness of the second support member 12.

[0055] Next, please refer to Figure 4c In step S2, the second support member 12 of the bottom formwork of the top plate 21 of the underground connecting structure is installed on the top of the current central diaphragm pile, and two triangular support frames 13 are fixedly set at the bottom of the second support member 12 located on both sides of the central diaphragm pile to complete the construction of the support system for the top plate 21 of the underground connecting structure.

[0056] The central diaphragm pile is optimized into the vertical load-bearing component of the support system of the top slab 21 of the underground connecting structure (adapted to local conditions). The support system of the entire top slab is simple and replaces the existing construction method of setting up a scaffold in a narrow space as the support system, effectively saving materials and reducing the construction period required for the construction formwork support system.

[0057] Next, please refer to Figure 4d Execute step S3 to construct the top slab 21 of the underground connecting structure and cure the top slab 21 of the underground connecting structure until it reaches the design strength. Then, the working surface above the top slab 21 of the underground connecting structure can be handed over.

[0058] The construction of the top slab 21 for the underground connection structure includes:

[0059] The bottom formwork of the top plate 21 of the underground connecting structure is set on the top of the second support member 12;

[0060] The reinforcement binding and concrete pouring of the top slab 21 of the underground connecting structure were carried out. For details, please refer to... Figure 5A predetermined size of timber 201 and plywood 202 is laid longitudinally on the top of the second support member 12 to form the bottom mold 20 of the top plate of the underground connecting structure. In this embodiment, the timber 201 is 50mm×100mm in size (spacing ≤300mm) and the plywood 202 is 18mm thick to form the bottom mold of the top plate structure.

[0061] Next, please refer to Figure 4d Then, perform step S4 to cut the central diaphragm pile to a second distance below the bottom elevation of the middle slab of the lower basement (i.e., the second distance below with reference to the bottom elevation of the middle slab of the lower basement).

[0062] The second distance is set according to the thickness of the bottom mold of the middle plate of the underground connecting structure and the thickness of the second support member 12. Specifically, the second distance is equal to the sum of the thickness of the bottom mold of the middle plate of the underground connecting structure and the thickness of the second support member 12. The range of the first distance and the second distance is 20cm to 30cm. In this embodiment, the first distance and the second distance are both 20cm.

[0063] Next, please refer to Figure 4e In step S5, the second support member 12 for the bottom formwork of the underground connecting structure plate is installed on the top of the current central diaphragm pile, and the two triangular support frames 13 are fixedly set at the bottom of the second support member 12 located on both sides of the central diaphragm pile to complete the construction of the support system for the underground connecting structure plate 22.

[0064] Next, please refer to Figure 4e Then, proceed with step S6 to construct the middle slab 22 of the underground connecting structure and to cure the middle slab 22 of the underground connecting structure until it reaches the design strength.

[0065] Next, please refer to Figure 4f Execute step S7, remove the remaining central diaphragm piles, construct the base slab 23 of the underground connecting structure, and cure the base slab until it reaches the design strength.

[0066] The construction sequence of the underground connecting structure construction method of the present invention is from top to bottom, which can be summarized as: "top slab 21 of underground connecting structure → handover of top slab working surface → middle slab 22 of underground connecting structure → bottom slab 23 of underground connecting structure".

[0067] In steps S2 and S5, the spacing between the two triangular support frames 13 on the same side of the two adjacent intermediate piles is set at least according to the slab thickness, reinforcement and load parameters of the underground connecting structure.

[0068] In this embodiment, the distance between the two triangular support frames 13 on the same side of two adjacent intermediate piles is less than or equal to 1.8m. Here, the distance between the two triangular support frames 13 on the same side of the intermediate pile is equivalent to the spacing of the scaffolding in existing underground connecting structure construction. The specific spacing needs to be calculated based on the different parameters of each project (slab thickness, reinforcement, and load parameters of the underground connecting structure, etc.). For example, if the slab thickness of the underground connecting structure in the project is 200mm, a spacing of 1.8m is needed to meet the concrete load requirements; if the slab thickness of the underground connecting structure is 300mm, a spacing of 1.6m is needed to meet the concrete load requirements.

[0069] The construction method of the underground connecting structure of the present invention is based on using the central diaphragm pile as the template support system of the underground connecting structure, connecting the top slab of the plot or the basement of the sub-pit in advance, that is, prioritizing the sealing of the top slab of the underground connecting structure. Compared with the bottom-up construction sequence of the prior art, the working surface can be handed over to the relevant units in advance for construction above the underground connecting structure (if the part above the top slab is a municipal road, the backfilling construction can be carried out in advance), shortening the construction period. In addition, non-critical route processes such as the construction of the structure below the top slab are postponed to save construction time, reduce costs, and reduce safety hazards.

[0070] It should be noted that, for the sake of simplicity, the foregoing method embodiments are all described as a series of actions. However, those skilled in the art should understand that this application is not limited to the described order of actions, as some steps may be performed in other orders or simultaneously according to this application. Furthermore, those skilled in the art should also understand that the embodiments described in the specification are preferred embodiments, and the actions and modules involved are not necessarily essential to this application.

[0071] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0072] The present invention has the following advantages:

[0073] (1) Construction period reduction: By using central diaphragm piles as permanent vertical support carriers, the time for scaffolding erection and dismantling is reduced, thereby shortening the overall construction period. At the same time, the use of central diaphragm piles to replace part of the formwork support system achieves the goal of improving efficiency.

[0074] (2) Cost reduction: Reduce the amount of temporary support materials used, saving rental and transportation costs. The bearing capacity utilization rate of the central diaphragm pile is increased to over 90%, avoiding redundant turnover materials and labor input.

[0075] (3) Enhanced safety: Eliminates spatial obstruction caused by dense scaffolding, improving personnel passage and emergency evacuation efficiency. The combination of rigid bracket-truss system and central diaphragm pile makes its deformation resistance superior to traditional scaffolding.

[0076] (4) Green construction: Reduce steel and wood consumption. Utilize the existing central diaphragm piles to reduce carbon emissions to a certain extent, which meets the requirements of sustainable construction.

[0077] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A support system, characterized in that, include: The system comprises a first support member, a second support member, and two triangular support frames. The second support member is vertically mounted at one end of the first support member, and the two triangular support frames are fixedly mounted at the bottom of the second support member located on both sides of the first support member.

2. The support system as described in claim 1, characterized in that, The first support component is a central partition pile shared by adjacent plots.

3. The support system as described in claim 1, characterized in that, The second support component is a channel steel or an I-beam.

4. The support system as described in claim 3, characterized in that, Each triangular support frame is made of steel.

5. The support system as described in claim 4, characterized in that, Each triangular support frame is rigidly connected to the second support member.

6. The support system as described in claim 1, characterized in that, Each triangular support frame is a right-angled triangle support frame.

7. The support system as described in claim 1, characterized in that, Two triangular support frames symmetrically clamp the first support component.

8. A construction method for an underground interconnection structure, characterized in that, include: After the underground connecting structure on both sides of the construction site is constructed to the design reference elevation ±0.000, the central diaphragm pile shared between the two underground structures is cut to the first distance below the bottom elevation of the top slab of the lower underground structure. Install the second support member of the bottom formwork of the top plate of the underground connecting structure on the top of the current central diaphragm pile, and fix two triangular support frames at the bottom of the second support members located on both sides of the central diaphragm pile to complete the construction of the support system for the top plate of the underground connecting structure. Construction of the top slab of the underground connecting structure is carried out, and the top slab of the underground connecting structure is cured until it reaches the design strength. The working surface above the top slab of the underground connecting structure can then be handed over. Cut the central diaphragm pile to the second distance below the bottom elevation of the middle slab of the lower side basement; Install the second support component of the bottom formwork of the underground connecting structure slab on the top of the current central diaphragm pile, and fix two triangular support frames at the bottom of the second support component located on both sides of the central diaphragm pile to complete the construction of the support system for the underground connecting structure slab; carry out the construction of the underground connecting structure slab, and carry out the curing of the underground connecting structure slab until it reaches the design strength. Remove the remaining central diaphragm piles, construct the base slab of the underground connecting structure, and cure the base slab until it reaches the design strength.

9. The construction method of the underground interconnection structure as described in claim 8, characterized in that, The construction of the top slab for the underground connection structure includes: The bottom formwork of the top slab of the underground connecting structure is set on top of the second support member; The reinforcement of the top slab of the underground connecting structure was tied and the concrete was poured.

10. The construction method of the underground interconnection structure as described in claim 8, characterized in that, The first distance is set based on the thickness of the bottom formwork of the top plate of the underground connecting structure and the thickness of the second support member; the second distance is set based on the thickness of the bottom formwork of the middle plate of the underground connecting structure and the thickness of the second support member.

11. The construction method of the underground interconnection structure as described in claim 10, characterized in that, Both the first distance and the second distance range from 20cm to 30cm.

12. The construction method of the underground interconnection structure as described in claim 10, characterized in that, The spacing between the two triangular support frames on the same side of two adjacent central diaphragm piles shall be set at least according to the slab thickness, reinforcement and load parameters of the underground connecting structure.

13. The construction method of the underground interconnection structure as described in claim 12, characterized in that, The distance between two triangular support frames on the same side of two adjacent central diaphragm piles is less than or equal to 1.8m.

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