Foundation pit supporting structure formed by prefabricated foundation pit reinforced concrete hollow supporting members

Abstract

The utility model discloses a foundation pit supporting structure formed by prefabricated foundation pit reinforced concrete hollow supporting members. The foundation pit supporting structure comprises the prefabricated foundation pit reinforced concrete hollow supporting members and embedded anchoring parts. The prefabricated foundation pit reinforced concrete hollow supporting component comprises a supporting middle section and a quick mounting connector. Each steel-concrete combined type quick mounting joint comprises an end steel pipe; one end of each end steel pipe extends outwards from the end part of the corresponding end of the supporting middle section and is provided with a flange structure; each flange structure is provided with a reinforcing steel bar penetrating hole corresponding to each supporting longitudinal reinforcing steel bar of the supporting middle section; each embedded anchoring part comprises an anchoring part end plate with the covering surface larger than that of the flange structure; each anchoring part end plate is provided with an anchoring part connecting reinforcing steel bar corresponding to each supporting longitudinal reinforcing steel bar; each anchoring part connecting steel bar penetrates through the corresponding steel bar penetrating hole and then is connected with the corresponding supporting longitudinal steel bar through a steel bar sleeve connector.

Description

Technical Field

[0001] The utility model relates to the technical field of foundation pit construction, in particular to a foundation pit supporting structure formed by prefabricated foundation pit reinforced concrete hollow supporting components. Background Art

[0002] Traditional support types widely used in foundation pit projects include cast-in-place reinforced concrete support, prefabricated assembled steel support, etc. Traditional cast-in-place reinforced concrete support has high rigidity, safety and reliability, and flexible plane layout, but it has the following significant disadvantages:

[0003] (1) Excessive use of materials and uneconomical: The concrete support cross-section is generally large, the cross-nodes of the bars are complex, the amount of steel bars and concrete used is large, and the economy is poor;

[0004] (2) Long construction period and exposure time: From excavation to the support bottom elevation, it is necessary to set up the bottom formwork, tie steel bars, pour concrete, and maintain. There are many processes and the time is long. The foundation pit is exposed for a long time without support, and the passive area near the excavation surface is greatly deformed;

[0005] (3) Difficulty in demolition: During the foundation pit backbuilding stage, the removal of concrete supports is difficult and dangerous, and consumes a lot of manpower and mechanical equipment;

[0006] (4) Large amount of waste: The removal of concrete supports generates a large amount of solid waste with a low recycling rate, which is not in line with the direction of green and environmental protection development.

[0007] The existing steel supports have light weight, fast construction speed and can be used in a turnover manner, but they also have the following difficult-to-overcome problems:

[0008] (1) The support system has poor integrity and can generally only withstand pressure;

[0009] (2) In order to effectively control deformation, the pre-axial force needs to be strictly controlled, and the construction process requires high standards;

[0010] (3) The node connection is weak and it is easy to fall under extreme working conditions, and the safety is relatively poor.

[0011] Therefore, how to achieve material saving, rapid support, high rigidity, small deformation, and green and low-carbon in the construction of foundation pit support structures has become a technical problem that technical personnel in this field urgently need to solve. Utility Model Content

[0012] In view of the above-mentioned defects of the prior art, the utility model provides a foundation pit support structure formed by prefabricated foundation pit reinforced concrete hollow support members, the purpose of which is to save materials, quickly support, have high rigidity, small deformation, and be green and low-carbon in the construction of the foundation pit support structure.

[0013] To achieve the above object, the utility model discloses a foundation pit support structure formed by prefabricated reinforced concrete hollow support members for foundation pits, including prefabricated reinforced concrete hollow support members for foundation pits and embedded anchor fittings arranged in pairs on the collar beam or capping beam.

[0014] The prefabricated reinforced concrete hollow support member for foundation pits includes a support middle section which is a hollow reinforced concrete pipe structure, and steel-concrete combined quick-installation joints arranged at both ends of the support middle section.

[0015] The support middle section includes a number of support longitudinal steel bars evenly distributed around the pipe wall.

[0016] Each of the steel-concrete combined quick-installation joints includes an end steel pipe whose outer shape matches the hollow inner hole at the corresponding end of the support middle section.

[0017] Each of the end steel pipes is fixed in the hollow inner hole at the corresponding end of the support middle section, with one end extending outwards from the corresponding end of the support middle section and having a flange structure.

[0018] Each of the flange structures is provided with a steel bar passing hole corresponding to each of the support longitudinal steel bars.

[0019] Each of the embedded anchor fittings includes an anchor fitting end plate with a coverage area larger than that of the flange structure.

[0020] Each of the anchor fitting end plates is provided with an anchor fitting connecting steel bar corresponding to each of the support longitudinal steel bars of the support middle section.

[0021] Each of the anchor fitting connecting steel bars is connected to the corresponding support longitudinal steel bar through a steel bar sleeve connector after passing through the steel bar passing hole of the corresponding flange structure.

[0022] Preferably, the cross-section of the support middle section is circular or square; the cross-section of any one of the end steel pipes is circular or square.

[0023] Preferably, the support middle section further includes a number of stirrups arranged along the length direction.

[0024] Each of the support longitudinal steel bars is a HRB400 grade steel bar.

[0025] Each of the stirrups is a HPB300 grade steel bar.

[0026] Preferably, one end of each of the support longitudinal steel bars connected to the corresponding steel bar sleeve connector is provided with an external thread, and is fixedly connected to the corresponding steel bar sleeve connector through the external thread by threaded connection.

[0027] Preferably, one end of each of the end steel pipes located inside the supporting middle section is closed with a steel plate, and the interior is poured with dense concrete.

[0028] Preferably, the outer wall of each of the end steel pipes located inside the supporting middle section is provided with a plurality of shear bolts, and each of the shear bolts is fixed inside the pipe wall of the supporting middle section.

[0029] Preferably, the flange structure carried by one end of each of the end steel pipes extending outward from the supporting middle section includes a first flange and a second flange;

[0030] All the steel bar penetration holes of the first flange and the second flange are aligned one by one and are coaxially arranged with the corresponding supporting longitudinal steel bars and the corresponding anchor connecting steel bars.

[0031] Preferably, the strength grade of concrete used in the prefabricated foundation pit reinforced concrete hollow supporting member is not less than C50, and the steel material is Q235B or Q355B.

[0032] Preferably, each of the anchor end plates is arranged on the surrounding purlin or crown beam through a plurality of anchor anchor bars.

[0033] More preferably, each of the anchor bars and each of the anchor connecting steel bars are HRB400 grade steel bars; the material of each of the anchor end plates is Q235B or Q355B; each of the anchor connecting steel bars has an external thread at one end connected to the corresponding steel bar sleeve connector, and is fixed to the corresponding steel bar sleeve connector through a threaded connection between the corresponding external thread and the corresponding steel bar sleeve connector, and the diameter is the same as the diameter of the corresponding supporting longitudinal steel bar.

[0034] Beneficial effects of the utility model:

[0035] The utility model ensures the compressive bearing capacity of the supporting components through high-strength concrete. The hollow structure can significantly save materials and reduce weight. The quick installation joints and anchors can be connected in time to form supporting stiffness, reduce the unsupported exposure time in the excavation stage to effectively control deformation, and can be conveniently dismantled, recycled and reused after use. The use of factory prefabrication can save on-site maintenance time and effectively ensure the quality of the components.

[0036] The utility model achieves the purposes of reducing weight, strengthening nodes, rapid construction, ensuring quality and turnover use through the combined use of high-strength concrete, a hollow structure in the middle section, a steel-concrete combined joint and embedded anchor pieces and factory prefabrication.

[0037] The concept, specific structure and technical effects of the present utility model will be further described below in conjunction with the accompanying drawings, so as to fully understand the purpose, features and effects of the present utility model. Description of the Drawings

[0038] Figure 1 The structural schematic diagram showing the connection between the support intermediate section and the end steel pipe in an embodiment of the present utility model.

[0039] Figure 2 The structural schematic diagram showing the connection between the embedded anchor and the collar beam or capping beam in an embodiment of the present utility model.

[0040] Figure 3 The structural schematic diagram showing the connection between the support intermediate section, the end steel pipe and the embedded anchor in an embodiment of the present utility model.

[0041] Figure 4 The structural schematic diagram showing that the cross-section of the support intermediate section is square and the cross-section of the end steel pipe is circular in an embodiment of the present utility model.

[0042] Figure 5 The structural schematic diagram showing that the cross-sections of the support intermediate section and the end steel pipe are square in an embodiment of the present utility model.

[0043] Figure 6 The structural schematic diagram showing that the cross-sections of the support intermediate section and the end steel pipe are circular in an embodiment of the present utility model.

[0044] Figure 7 The structural schematic diagram showing one side of the embedded anchor facing the support intermediate section in an embodiment of the present utility model.

[0045] In the figure: 1, support intermediate section; 2, stirrup; 3, longitudinal main reinforcement of the support; 4, shear stud; 5, end steel pipe; 6, second flange; 7, first flange; 8, dense concrete; 9, collar beam or capping beam; 10, anchor bar of the anchor; 11, connecting bar of the anchor; 12, end plate of the anchor; 13, reinforcing bar sleeve connector. Detailed Description of the Preferred Embodiments

[0046] Embodiment

[0047] As Figures 1 to 7 shown, a foundation pit support structure formed by precast reinforced concrete hollow support members for foundation pits includes precast reinforced concrete hollow support members for foundation pits and pairs of embedded anchors provided on the collar beam or capping beam 9;

[0048] The precast reinforced concrete hollow support member for foundation pits includes a support intermediate section 1 in the form of a hollow reinforced concrete pipe structure and steel-concrete combined quick-installation joints provided at both ends of the support intermediate section 1;

[0049] The support middle section 1 includes several support longitudinal steel bars 3 evenly distributed around the pipe wall;

[0050] Each steel-concrete combined quick-installation joint includes an end steel pipe 5 whose outer shape matches the hollow inner hole at one end of the corresponding end of the support middle section 1;

[0051] Each end steel pipe 5 is fixed in the hollow inner hole at one end of the corresponding end of the support middle section 1, with one end extending outward from the end of the corresponding end of the support middle section 1 and having a flange structure;

[0052] Each flange structure is provided with a steel bar passing hole corresponding to each support longitudinal steel bar 3;

[0053] Each embedded anchor includes an anchor end plate 12 with a coverage area larger than the flange structure;

[0054] Each anchor end plate 12 is provided with an anchor connecting steel bar 11 corresponding to each support longitudinal steel bar 3 of the support middle section 1;

[0055] Each anchor connecting steel bar 11 is connected to the corresponding support longitudinal steel bar 3 through a steel bar sleeve connector 13 after passing through the steel bar passing hole of the corresponding flange structure.

[0056] In the utility model, the precast foundation pit reinforced concrete hollow support member is horizontally hoisted to the outside of the embedded anchor, the axis of the support member is adjusted to be perpendicular to the anchor end plate 12, and the steel bar passing holes of the flange structure are aligned with the anchor connecting steel bars 11. The precast foundation pit reinforced concrete hollow support member is moved so that the anchor connecting bars 11 are inserted into the steel bar passing holes of the flange structure, and then the longitudinal main steel bars 3 and the anchor connecting bars 11 are connected one by one with the steel bar sleeve connector 13. The steel bar sleeve connector 13 is tightened so that the end face of the precast foundation pit reinforced concrete hollow support member is closely attached to the embedded anchor end plate 12, and the installation of one end of the support member can be completed.

[0057] In some embodiments, the cross-section of the support middle section 1 is circular or square; the cross-section of any end steel pipe 5 is circular or square.

[0058] In some embodiments, the support middle section 1 further includes several stirrups 2 arranged along the length direction;

[0059] Each support longitudinal steel bar 3 is a HRB400 grade steel bar;

[0060] Each stirrup 2 is a HPB300 grade steel bar.

[0061] In some embodiments, one end of each support longitudinal steel bar 3 connected to the corresponding steel bar sleeve connector 13 has an external thread, and is fixedly connected through the corresponding external thread and the corresponding steel bar sleeve connector 13 by thread connection.

[0062] In some embodiments, one end of each end steel pipe 5 located inside the support intermediate section 1 is sealed with a steel plate, and the inside is filled with dense concrete 8.

[0063] In practical applications, filling the end steel pipe 5 with dense concrete 8 can ensure the compressive bearing capacity of the end cross-section.

[0064] In some embodiments, a number of shear studs 4 are provided on the outer wall of each end steel pipe 5 located inside the support intermediate section 1, and each shear stud 4 is fixed in the pipe wall of the support intermediate section 1.

[0065] In practical applications, setting the shear studs 4 on the outer wall of the end steel pipe 5 and fixing all the shear studs 4 in the pipe wall of the support intermediate section 1 can ensure the effective transmission of axial force.

[0066] In some embodiments, the flange structure carried by one end of each end steel pipe 5 extending outwards from the support intermediate section 1 includes a first flange 7 and a second flange 6;

[0067] All the steel bar passing holes of the first flange 7 and the second flange 6 are aligned one by one and coaxially arranged with the corresponding support longitudinal steel bars 3 and the corresponding anchor connecting steel bars 11.

[0068] In practical applications, all the steel bar passing holes of the first flange 7 and the second flange 6 being aligned one by one and coaxially arranged with the corresponding support longitudinal steel bars 3 and the corresponding anchor connecting steel bars 11 enables each anchor connecting bar 11 to pass smoothly through the corresponding steel bar passing hole during installation.

[0069] In some embodiments, the strength grade of the concrete used in the precast foundation pit reinforced concrete hollow support member is not lower than C50, and the steel is Q235B or Q355B.

[0070] In some embodiments, each anchor end plate 12 is arranged on the diaphragm wall or capping beam 9 through a number of anchor bars 10.

[0071] In some embodiments, each anchor bar 10 and each anchor connecting steel bar 11 are HRB400 grade steel bars; the material of each anchor end plate 12 is Q235B or Q355B; one end of each anchor connecting steel bar 11 connected to the corresponding steel bar sleeve connector 13 is provided with an external thread, and is fixedly connected by a thread with the corresponding steel bar sleeve connector 13 through the corresponding external thread, and the diameter is the same as the diameter of the corresponding support longitudinal steel bar 3.

[0072] The preferred specific embodiments of the present utility model have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present utility model without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field according to the concept of the present utility model through logical analysis, reasoning, or limited experiments on the basis of the prior art shall fall within the protection scope determined by the claims.

Claims

1. A foundation pit support structure formed by prefabricated reinforced concrete hollow support members for foundation pits; characterized in that, It comprises a prefabricated foundation pit reinforced concrete hollow supporting member and embedded anchoring pieces arranged in pairs on the surrounding purlin or the crown beam (9); The prefabricated foundation pit reinforced concrete hollow support member comprises a support middle section (1) of a hollow reinforced concrete pipe structure, and steel-concrete combined quick-installation joints arranged at both ends of the support middle section (1); The supporting middle section (1) comprises a plurality of supporting longitudinal steel bars (3) evenly distributed around the pipe wall; Each of the steel-concrete combined quick-install joints comprises an end steel pipe (5) whose shape matches the hollow inner hole at a corresponding end of the supporting middle section (1); Each of the end steel pipes (5) is fixed in the hollow inner hole of the corresponding end of the supporting middle section (1), one end of which protrudes outward from the corresponding end of the supporting middle section (1) and has a flange structure; Each of the flange structures is provided with a steel bar penetration hole corresponding to each of the corresponding supporting longitudinal steel bars (3); Each of the embedded anchors comprises an anchor end plate (12) having a larger coverage area than the flange structure; Each of the anchor end plates (12) corresponding to each of the supporting longitudinal steel bars (3) of the supporting middle section (1) is provided with an anchor connecting steel bar (11); Each anchor connecting steel bar (11) is connected to the corresponding supporting longitudinal steel bar (3) through a steel bar sleeve connector (13) after passing through the corresponding steel bar penetration hole of the flange structure.

2. The foundation pit support structure formed by the prefabricated reinforced concrete hollow support member for the foundation pit according to claim 1, wherein The cross section of the supporting middle section (1) is circular or square; the cross section of any of the end steel pipes (5) is circular or square.

3. The foundation pit support structure formed by the prefabricated reinforced concrete hollow support member for foundation pit according to claim 1, characterized in that, The supporting middle section (1) further comprises a plurality of stirrups (2) arranged along the length direction; Each of the supporting longitudinal steel bars (3) is a HRB400 grade steel bar; Each of the stirrups (2) is a HPB300 grade steel bar.

4. The foundation pit support structure formed by the prefabricated reinforced concrete hollow support member for foundation pit according to claim 1, characterized in that, One end of each of the supporting longitudinal steel bars (3) connected to the corresponding steel bar sleeve connector (13) has an external thread, and the corresponding external thread and the corresponding steel bar sleeve connector (13) are fixed by threaded connection.

5. The foundation pit support structure formed by the prefabricated reinforced concrete hollow support member for the foundation pit according to claim 1, characterized in that, One end of each of the end steel pipes (5) located inside the supporting middle section (1) is sealed with a steel plate, and the interior is poured with dense concrete (8).

6. The foundation pit support structure formed by the prefabricated reinforced concrete hollow support member for foundation pits according to claim 1, characterized in that, The outer wall of each end steel pipe (5) located inside the supporting middle section (1) is provided with a plurality of shear bolts (4), and each of the shear bolts (4) is fixed inside the pipe wall of the supporting middle section (1).

7. The foundation pit support structure formed by the prefabricated reinforced concrete hollow support member for the foundation pit according to claim 1, characterized in that, The flange structure carried by the end of each of the end steel pipes (5) extending outward from the supporting middle section (1) comprises a first flange (7) and a second flange (6); All the steel bar penetration holes of the first flange (7) and the second flange (6) are aligned one by one and are coaxially arranged with the corresponding supporting longitudinal steel bars (3) and the corresponding anchor connecting steel bars (11).

8. The foundation pit support structure formed by the prefabricated reinforced concrete hollow support member for the foundation pit according to claim 1, characterized in that, The strength grade of concrete used in the prefabricated foundation pit reinforced concrete hollow supporting member is not less than C50, and the steel material is Q235B or Q355B.

9. The foundation pit support structure formed by the prefabricated foundation pit reinforced concrete hollow support member according to claim 1, characterized in that, Each of the anchor end plates (12) is arranged on the waling beam or capping beam (9) through a number of anchor bars (10).

10. The foundation pit support structure formed by the prefabricated reinforced concrete hollow support member for foundation pits according to claim 9, characterized in that, Each of the anchor bars (10) and each of the anchor connecting bars (11) are HRB400 grade steel bars; the material of each of the anchor end plates (12) is Q235B or Q355B; one end of each of the anchor connecting bars (11) connected to the corresponding steel bar sleeve connector (13) is provided with an external thread, and is fixedly connected by threading with the corresponding steel bar sleeve connector (13) through the corresponding external thread, and the diameters are the same as the diameters of the corresponding supporting longitudinal steel bars (3).

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