Disassembly-free support changing structure system of support system

Abstract

A disassembly-free support changing structure system of a support system relates to the technical field of foundation pit support, and comprises a primary support structure, a disassembly-free support changing structure and a force transmission mechanism, the primary support structure comprises a waterproof curtain of a foundation pit, a support pile, a top beam and a reinforced concrete inner support connected to the inner side of the top beam, the disassembly-free support changing structure forms a part of the side wall of the building structure under construction and is located on the inner side of the supporting pile, the disassembly-free support changing structure and the supporting pile are oppositely arranged, and a force transmission mechanism is arranged between the disassembly-free support changing structure and the supporting pile. No supporting steel structure is arranged in the structure, construction of follow-up working procedures is very convenient, particularly, the roof formwork support is wide in construction working face, small in interference and high in work efficiency, the construction period of structures such as box culverts and underground passages can be shortened, and the construction period can be generally saved by about 1 / 3-2 / 5.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation pit support, and particularly to a non-demolition replacement bracing structure system for a support system. Background Art

[0002] During the construction of cast-in-place structures such as airport culverts and underground passages, it is often necessary to set up a foundation pit support system. The foundation pit support system commonly uses support structures such as reinforced concrete and steel structures. In particular, steel supports are widely used in projects because of their convenient disassembly and assembly and flexible replacement bracing. However, due to the numerous processes in the construction process of underground structure projects, mutual restrictions often occur under such conditions, resulting in increased costs and extended construction periods. Combining with the existing steel structure replacement bracing technology, the following problems are analyzed:

[0003] 1. The replacement bracing technology of the support system adopts the steel structure opposite bracing method. When using the steel structure opposite bracing method, after the structure construction in the foundation pit is completed with the bottom slab and part of the side wall constructed, both the installation and use of the replacement bracing need to be demolished, with a long construction period and high rental costs; at the same time, when constructing the culvert top slab, the top slab structure is often a formwork construction of an ultra-dangerous large project with a thickness of about 1 meter. Using the internal steel opposite bracing method for replacement bracing is not conducive to the layout of the high formwork support, and setting the internal steel opposite bracing will greatly affect the formwork construction efficiency.

[0004] 2. The replacement bracing technology of the support system adopts the steel structure vertical inclined bracing method. When the structure construction in the foundation pit is completed with the bottom slab and part of the side wall constructed, the steel structure inclined bracing is used to support and replace bracing at the root of the structure. Although this method has less impact on the top slab formwork support construction compared with the steel opposite bracing method, the installation and demolition are still relatively troublesome, and some components need to be buried in the bottom slab, with a long construction period and not low cost. Content of the Utility Model

[0005] The present invention provides a non-demolition replacement bracing structure system for a support system, aiming to solve the problems described in parts 1 and 2 of the background art.

[0006] To achieve the above object, the technical solution of the present invention is:

[0007] A non-demolition replacement bracing structure system for a support system includes an initial support structure, a non-demolition replacement bracing structure, and a force transmission mechanism. The initial support structure includes a waterproof curtain of the foundation pit, support piles, a capping beam, and a reinforced concrete internal bracing connected to the inner side of the capping beam. The non-demolition replacement bracing structure forms a part of the side wall of the building under construction and is located inside the support piles. The non-demolition replacement bracing structure is arranged opposite to the support piles, and a force transmission mechanism is provided between the non-demolition replacement bracing structure and the support piles.

[0008] Preferably, the force transmission mechanism is a filling structure formed by concrete pouring.

[0009] Preferably, a waterproof layer is further provided between the filling structure and the retaining pile.

[0010] Preferably, the non-removable replacement bracing structure includes a second steel reinforcement cage connected to the first steel reinforcement cage on the side wall of the under-construction building structure, and the second steel reinforcement cage forms a part of the side wall of the under-construction building structure by pouring concrete the same as that of the side wall of the under-construction building structure.

[0011] Preferably, a third steel reinforcement cage is provided in the filling structure, and the third steel reinforcement cage is connected to the second steel reinforcement cage by connecting steel bars.

[0012] Preferably, the second steel reinforcement cage includes horizontal framework bars on both sides, and the two ends of the horizontal framework bars are respectively vertically intersected and welded with the side wall horizontal bars of the first steel reinforcement cage, and the connecting steel bars are respectively welded to the third steel reinforcement cage and the side wall horizontal bars on the outer side.

[0013] Preferably, there are several connecting steel bars, and the several connecting steel bars are evenly distributed, and anti-pulling steel bars are also welded to the inner ends of the several connecting steel bars.

[0014] Preferably, the connecting steel bar is an L-shaped hook structure, and the hook part of the connecting steel bar hooks the anti-pulling steel bar and is welded to the anti-pulling steel bar.

[0015] Preferably, the bottom of the non-removable replacement bracing structure extends inwards to form a part of the bottom slab of the under-construction building structure.

[0016] The non-removable replacement bracing structure system of a support system of the present new type has the following beneficial effects:

[0017] 1. The non-removable replacement bracing structure of the present new type can be constructed on site or mass-produced in a factory, and the non-removable replacement bracing structure is implemented synchronously during the construction of the side wall structure, which is beneficial to improving work efficiency.

[0018] 2. The present new type uses a more economical non-removable replacement bracing structure to replace the conventional steel structure support, reduces the use of steel structure materials, and has a relatively lower cost; when applied to structures such as box culverts and underground passages with larger spans, the economic effect is more obvious.

[0019] 3. There is no steel structure support inside the structure of the present new type, which is very convenient for the subsequent construction of each process. Especially, the construction working surface of the top plate formwork support is spacious, with little interference and high work efficiency, which is beneficial to shortening the construction period of structures such as box culverts and underground passages. Usually, the construction period can be saved by about 1 / 3 - 2 / 5.

[0020] 4. For the construction of underground structures of the present new type, while reducing the construction period, the safety operation risk is also reduced.

[0021] 5. The new type of non-demolition replacement bracing structure plays a role of temporary support during the construction process and ultimately does not need to be demolished, forming a part of the structure side wall, which is beneficial to enhancing the structural force. Description of the Drawings

[0022] Figure 1 Schematic diagram of the initial support structure of the new type of foundation pit;

[0023] Figure 2 Schematic sectional view of the structure of the new type of non-demolition replacement bracing system;

[0024] Figure 3 Schematic plan view of the position of the new type of non-demolition replacement bracing structure relative to the side wall of the under-construction building structure;

[0025] Figure 4 Large-scale drawing of the layout of the new type of non-demolition replacement bracing structure;

[0026] Figure 5 Schematic diagram of the completion of the new type of non-demolition replacement bracing structure system.

[0027] 1. Water-stop curtain; 2. Support pile, 3. Guardrail; 4. Water retaining platform; 5. Capping beam; 6. Reinforced concrete internal bracing; 7. Drainage blind ditch; 8. Cushion; 9. Side wall of the under-construction building structure; 10. Schematic diagram of the steel internal bracing to be equivalently replaced (i.e., the position where the steel internal bracing should be set in the prior art); 11. Non-demolition replacement bracing structure; 12. Horizontal reinforcement of the side wall; 13. Vertical reinforcement of the side wall; 14. Horizontal framework reinforcement; 15. Connecting reinforcement; 16. Uplift reinforcement; 17. Concrete of the non-demolition replacement bracing structure; 18. Structural floor slab; 19. Water-stop steel plate; 20. Force transfer mechanism; 21. Demolition of the reinforced concrete internal bracing; 22. Structural roof slab; 23. Waterproof layer and backfill of the fat groove. Detailed Implementation Modes

[0028] The following description details the implementation modes of the new type in a step-by-step manner. This description is only for the preferred embodiments of the new type and is not used to limit the protection scope of the new type. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the new type should be included in the protection scope of the new type.

[0029] In the description of the new type, it should be noted that the orientation or position relationships indicated by the terms "upper", "lower", "left", "right", "top", "bottom", "inner", "outer", etc. are based on the orientation or position relationships shown in the drawings. They are only for describing the new type and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, as well as a specific orientation structure and operation. Therefore, they should not be construed as limitations on the new type.

[0030] Embodiment 1

[0031] A non-dismantling type replacement bracing structure system for a bracing system, as Figures 1-5 shown, which includes an initial bracing structure, a non-dismantling type replacement bracing structure and a force transmission mechanism;

[0032] The described initial bracing structure includes a waterproof curtain 1 of the foundation pit, bracing piles 2, a capping beam 5, and a reinforced concrete internal bracing 6 connected to the inner side of the capping beam 5; the above structures are common structures for foundation pit bracing, and their specific structures and construction methods will not be elaborated here;

[0033] The described non-dismantling type replacement bracing structure forms a part of the side wall 9 of the building under construction and is located inside the bracing piles 2. The described non-dismantling type replacement bracing structure is arranged opposite to the bracing piles 2, and a force transmission mechanism 20 is provided between the non-dismantling type replacement bracing structure and the bracing piles 2; the function of the force transmission mechanism 20 is to establish a firm connection between the non-dismantling type replacement bracing structure and the bracing piles 2, and form a supporting effect to replace the steel structure replacement bracing structure through force conduction.

[0034] Example 2

[0035] As Figure 2 shown, the described force transmission mechanism 20 is a filling structure formed by concrete pouring.

[0036] As Figure 2 shown, a waterproof layer is further provided between the filling structure and the bracing piles 2.

[0037] Example 3

[0038] As Figure 3 、 4 shown, the described non-dismantling type replacement bracing structure includes a second steel reinforcement cage connected to the first steel reinforcement cage of the side wall 9 of the building under construction. The second steel reinforcement cage forms a part of the side wall 9 of the building under construction by pouring the same concrete as the side wall 9 of the building under construction.

[0039] Example 4

[0040] A third steel reinforcement cage (not shown in the figure) is provided in the described filling structure, and the third steel reinforcement cage is connected to the second steel reinforcement cage through connecting steel bars 15. In this way, the stability of the replacement bracing structure system is further improved.

[0041] Example 5

[0042] As Figure 4 shown, the described second steel reinforcement cage includes horizontal framework steel bars 14 located on both sides. The two ends of the horizontal framework steel bars 14 are respectively vertically intersected and welded with the side wall horizontal steel bars 12 of the first steel reinforcement cage, and the connecting steel bars 15 are respectively welded to the third steel reinforcement cage and the side wall horizontal steel bars 12 located on the outside.

[0043] As Figure 4As shown, there are several connecting steel bars 15, and the several connecting steel bars 15 are evenly distributed. Anti-pulling steel bars 16 are also welded to the inner ends of the several connecting steel bars 15.

[0044] As Figure 4 shown, the connecting steel bar 15 is an L-shaped hook structure ( Figure 4 in a top view structure in the figure), and the hook part of the connecting steel bar 15 hooks the anti-pulling steel bar 16 and is welded to the anti-pulling steel bar 16.

[0045] It can be understood that the relevant structure of the second steel cage in this embodiment can also be set to other steel cage structures that can achieve relevant functions, which will not be elaborated here.

[0046] Embodiment 6

[0047] As Figure 2 shown, the bottom of the non-dismantling type replacement bracing structure extends inwards to form a part of the floor slab of the under-construction building structure. This part actually forms the stiffening rib plate of the non-dismantling type replacement bracing structure, which can improve its stability and the supporting ability for the side wall of the foundation pit.

[0048] The working principle of this new type:

[0049] 1. Using the principle of force equivalent substitution, before construction, first conduct in-structure simulation and check the internal steel structure strut in the structure to ensure the safety of the force in the foundation pit operation; then at the position where the steel internal strut is simulated and set, according to the principle of action and reaction, set the non-dismantling type replacement bracing structure in the side wall structure of the under-construction building structure, connect the non-dismantling type replacement bracing structure and the retaining pile into one body through the filling structure, and form a supporting force together with the retaining pile structure, so as to replace the reaction force exerted on the side wall of the foundation pit by the steel structure internal strut. That is, replace the single-point support (one end of the steel structure internal strut) exerted on the side wall of the foundation pit by the steel structure internal strut with the surface load support of the non-dismantling type replacement bracing structure, achieve the effect of force equivalent substitution, and realize the combination of permanent and temporary structures and green construction.

[0050] 2. The filling material of the non-dismantling type replacement bracing structure uses the same material as that for side wall grouting. During construction, several non-dismantling type replacement bracing structures are implemented simultaneously; to ensure the reliable transmission of the lateral pressure outside the foundation pit, the filling structure uses wet lean concrete such as C15 - C20, and it is required to be cured to reach the strength requirement to ensure the effective and coordinated operation of the replacement bracing system.

[0051] 3. The bottom of the non-dismantling type replacement bracing structure extends inwards to form a part of the floor slab of the under-construction building structure, which plays the role of a stiffening rib and further improves the supporting ability of the non-dismantling type replacement bracing structure.

[0052] 4. During the specific construction, first construct the initial support structure, then construct several non-removable replacement strut structures, and at the same time construct the filling structure, so that the non-removable replacement strut structure is connected with the support piles as a whole; when the non-removable replacement strut structure and the filling structure reach the strength requirements during curing and meet the force-bearing conditions of the non-removable replacement strut structure, remove the reinforced concrete internal strut 6 between the capping beams. Continue to construct the side walls and roof of the remaining under-construction building structure, as well as do waterproofing and protective walls, and backfill the backfill material in the side trench in time after the structural strength meets the requirements.

Claims

1. A support system free-disassembly replacement support structure system, characterized by: It includes an initial support structure, a disassembly-free support replacement structure and a force transmission mechanism. The initial support structure includes a water-stop curtain of the foundation pit, support piles, a crown beam, and a reinforced concrete inner support connected to the inner side of the crown beam. The disassembly-free support replacement structure constitutes a part of the side wall of the building structure under construction and is located on the inner side of the support piles. The disassembly-free support replacement structure is arranged opposite to the support piles, and a force transmission mechanism is provided between the disassembly-free support replacement structure and the support piles.

2. A support system non-disassembly replacement support structure system as claimed in claim 1, characterized in that: The force transmission mechanism is a filling structure cast by concrete.

3. A support system non-disassembly replacement support structure system as claimed in claim 2, characterized in that: A waterproof layer is also provided between the filling structure and the supporting piles.

4. A support system non-disassembly replacement support structure system as claimed in claim 3, characterized in that: The non-disassembly type support replacement structure comprises a second steel cage connected to the first steel cage of the side wall of the building structure under construction, and the second steel cage forms a part of the side wall of the building structure under construction by pouring the same concrete as the side wall of the building structure under construction.

5. A support system non-disassembly replacement support structure system as claimed in claim 4, characterized in that: A third steel cage is arranged in the filling structure, and the third steel cage is connected to the second steel cage via connecting steel bars.

6. A support system non-disassembly replacement support structure system as claimed in claim 5, characterized in that: The second steel cage includes horizontal skeleton bars on both sides, the two ends of the horizontal skeleton bars are respectively perpendicularly intersected with the side wall horizontal bars of the first steel cage and welded, and the connecting steel bars are respectively welded with the third steel cage and the side wall horizontal bars located on the outside.

7. A support system non-disassembly replacement support structure system as claimed in claim 6, characterized in that: There are a plurality of connecting steel bars, which are evenly distributed, and anti-pulling steel bars are welded to the inner ends of the connecting steel bars.

8. A support system non-disassembly replacement support structure system as claimed in claim 7, characterized in that: The connecting steel bar is an L-shaped hook structure, and the hook portion of the connecting steel bar hooks the pull-out steel bar and is welded to the pull-out steel bar.

9. A support system non-disassembly replacement support structure system as claimed in claim 8, characterized in that: The bottom of the non-disassembly type support replacement structure extends inwards to form a part of the bottom plate of the building structure under construction.

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