A connection node structure between prefabricated support and underground enclosure structure

Abstract

The present invention relates to the technical field of prefabricated building structures, and particularly to a connection node structure between a prefabricated support and an underground retaining structure, comprising a prefabricated support and a retaining structure, wherein a first structure is disposed between the retaining structure and the prefabricated support, the first structure comprising a first steel plate connected to the retaining structure, a flange structure connected to the prefabricated support, a load-bearing steel plate connected between the first steel plate and the flange structure, the load-bearing steel plate, the first steel plate, and the flange structure enclosing a first space, wherein a jack is disposed within the first space. Compared to cast-in-place concrete supports, the prefabricated support and connection method result in minimal waste, and the prefabricated support and steel joints can be recycled repeatedly, effectively responding to national requirements for energy conservation, emission reduction, and green construction. Simultaneously, the amount of on-site support, steel cage binding, and formwork required for hypothetical construction is significantly reduced, resulting in a short construction period and low energy consumption.

Description

Technical Field

[0001] The present invention relates to the technical field of prefabricated building structures, in particular to a connection node structure of a prefabricated support and an underground enclosure structure. Background Art

[0002] Existing concrete waist beams and supports are basically cast-in-place concrete structures. After the foundation pit is excavated, it is necessary to tie the steel cage on site, install the formwork, and then pour the concrete. Excavation can only continue after the concrete age. However, this will lead to a long construction period, high pollution, and high energy consumption. Based on this, precast concrete supports and waist beams can better solve the above problems.

[0003] The key to whether prefabricated waist beams and supports can be pre-rotated safely and reliably lies in the connection nodes between the supports and waist beams, and between the waist beams and the surrounding structure. The existing connection nodes are as follows:

[0004] First, the invention patent with patent number 202010819455.1 discloses a prefabricated and assembled vertical shaft support structure, including a prefabricated waist beam. The prefabricated waist beam is provided with connecting ends at both ends. The connecting ends include embedded steel plates and embedded steel bar connectors. The embedded steel plates of the two adjacent connecting ends are connected by welding I-beams, and the embedded steel bar connectors of the two adjacent connecting ends are connected by overlapping main bars.

[0005] Second, the invention patent with patent number 201510659421.X discloses a prefabricated prestressed concrete support and its erection method. The concrete support beam blocks are prefabricated. During the construction of the concrete support beam, the prefabricated concrete support beam blocks are directly assembled and connected by prestressed anchor cables to quickly form a concrete support beam.

[0006] Third, the invention patent application with patent application number 202011093820.1 discloses an edge node structure and construction method for support in an assembled foundation pit, including an assembled support and a crown beam or waist beam; a first expansion joint is fixed to the end of the assembled support, and a second expansion joint is fixed to the inner side of the crown beam or waist beam; the first expansion joint and the second expansion joint have the same structure, both including a solid steel plate, a U-hole steel plate, a U-shaped steel plate and a stiffening plate; one end of the U-shaped steel plate passes through the U-shaped hole on the U-hole steel plate and is welded to the solid steel plate, and multiple rows of oblong holes are provided on the two side walls of the other end; the solid steel plate and the U-hole steel plate are connected by a stiffening plate; the U-shaped steel plate of the first expansion joint is stuck in the U-shaped steel plate of the second expansion joint, and the oblong hole on the first expansion joint and the oblong hole on the second expansion joint are connected by bolts.

[0007] However, existing connection nodes have the following shortcomings:

[0008] 1. Cast-in-place concrete supports and beams require on-site reinforcement, formwork installation, and concrete pouring. Sufficient support for the foundation pit can only be provided after the concrete supports and beams reach their designed strength. This results in the foundation pit being exposed to the most unfavorable working conditions for a long time, making it difficult to control pit deformation. Furthermore, during the main structure reconstructing phase, the cast-in-place concrete supports and beams must be removed before the main structure can be constructed. This design and construction method consumes a significant amount of construction time and manpower, prolonging the construction period and resulting in significant resource waste and environmental pollution.

[0009] 2. In the invention patent with patent number 202010819455.1, the prefabricated waist beam and the continuous wall are connected with embedded connectors. Due to the error in the construction of the continuous wall, the actual construction error is not taken into account, and the installation feasibility is not high. At the same time, due to the average flatness of the continuous wall surface, there is a gap between the fully prefabricated waist beam and the continuous wall, and the reliability of this node is not high;

[0010] 3. In the invention patent No. 201510659421.X, the prestressed anchor cable connection system is different from the traditional prestressed system. Due to the site problems of the foundation pit construction site, there is no tensioning space under the support. The location of the retaining structure makes it impossible for the prestressed corrugated pipe to pass through the entire structure. The stiffness, stability and safety of this node are difficult to ensure.

[0011] 4. In the invention patent application with patent number 202011093820.1, the steel joints of the support and enclosure structures have low stiffness, low bearing capacity, complex installation of steel joint nodes, and the nodes are more sensitive to construction errors. Summary of the Invention

[0012] The purpose of the present invention is to solve the problems existing in the prior art and to provide a connection node structure between a prefabricated support and an underground enclosure structure.

[0013] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0014] A connection node structure between a prefabricated support and an underground retaining structure includes a prefabricated support and a retaining structure, a first structure is arranged between the retaining structure and the prefabricated support, the first structure includes a first steel plate connected to the retaining structure, and a flange structure connected to the prefabricated support, a load-bearing steel plate is connected between the first steel plate and the flange structure, the load-bearing steel plate, the first steel plate and the flange structure enclose a first space, and a jack is arranged in the first space.

[0015] As an improvement to the technical solution of the connection node structure between the prefabricated support and the underground retaining structure of the present invention, multiple profiles are connected between the retaining structure and the first steel plate, and one end of the multiple profiles is connected to the retaining structure through a first channel steel.

[0016] As an improvement to the technical solution of the connection node structure between the prefabricated support and the underground enclosure structure of the present invention, the profile is an I-beam.

[0017] As an improvement to the technical solution of the connection node structure between the prefabricated support and the underground retaining structure of the present invention, a third channel steel is provided at the connection between the profile and the retaining structure, and a second wedge block is provided between the third channel steel and the retaining structure.

[0018] As an improvement to the technical solution of the connection node structure between the prefabricated support and the underground retaining structure of the present invention, the flange structure includes a first flange prefabricated integrally with the prefabricated support and a second flange connected to the first flange.

[0019] As an improvement to the technical solution of the connection node structure between the prefabricated support and the underground enclosure structure of the present invention, the first space further includes at least one first wedge block connected to the first steel plate.

[0020] As an improvement to the technical solution of the connection node structure of the prefabricated support and underground retaining structure of the present invention, the first space also includes two second channel steels connecting the first steel plate and the flange structure, and the two second channel steels, the load-bearing steel plate, the first steel plate and the flange structure form the first space.

[0021] As an improvement to the technical solution of the connection node structure between the prefabricated support and the underground enclosure structure of the present invention, a second steel plate is provided on the inner side of each of the two second channel steels, and the first wedge block is provided at the connection between the second steel plate and the first steel plate.

[0022] As an improvement to the technical solution of the connection node structure of the prefabricated support and the underground enclosure structure of the present invention, the second steel plate and the load-bearing steel plate are both plugging steel plates.

[0023] As an improvement to the technical solution of the connection node structure between the prefabricated support and the underground retaining structure of the present invention, the prefabricated support is a steel support, a prefabricated concrete pipe support or a prefabricated concrete support.

[0024] Beneficial effects of the present invention:

[0025] 1. Compared with cast-in-place concrete supports, prefabricated supports and connections result in minimal waste. Prefabricated supports and steel joints can be recycled repeatedly, effectively meeting national energy conservation, emission reduction, and green construction requirements. This significantly reduces the amount of on-site support, steel cage binding, and formwork, resulting in a shorter construction period and lower energy consumption.

[0026] 2. This invention can use steel beams like traditional steel supports, or cast-in-place concrete beams, offering wide adaptability. Concrete beams offer a high tolerance for construction errors, as errors in all three directions can be adjusted using the cast-in-place beams. Furthermore, concrete beams enhance the integrity of the support structure, as the I-beams in the steel joints do not affect the reinforcement binding of the concrete beams.

[0027] 3. Prefabricated supports and their connection methods can avoid loose connections between pure prefabricated waist beams and continuous walls, ensuring a safe and reliable structural force system;

[0028] 4. The first structure of the present invention is detachably connected to the prefabricated support and enclosure structure, and the entire first structure is reusable. This solves the problem in the prior art where the supports and waist beams are discarded after a single use when using cast-in-situ reinforced concrete connection nodes, resulting in a large waste project. In addition, the present invention uses detachable bolts to ensure that the joints and prefabricated supports are reusable, and only the cast-in-situ concrete waist beam, which is used to eliminate errors and strengthen the integrity, is a temporary structure. This reduces the amount of waste and allows for a large amount of error.

[0029] 5. The flanges, channel steels, and steel plates in the present invention can all be prefabricated in the factory. On-site installation only requires tightening the bolts, making construction convenient. Furthermore, the concrete waist beam ensures high overall rigidity and stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a plan layout diagram of the prefabricated support in the present invention;

[0031] Figure 2 It is a plan layout diagram of the connection nodes between the prefabricated support and the enclosure structure in the present invention;

[0032] Figure 3 It is a cross-sectional view taken along line BB of the present invention;

[0033] Figure 4 AA is a cross-sectional view of the present invention;

[0034] Figure 5 It is a CC cross-sectional view of the present invention;

[0035] Figure 6 It is a structural schematic diagram of the present invention in use.

[0036] Explanation of the accompanying numbers: 1-prefabricated support; 2-enclosing structure; 3-first steel plate; 4-first flange; 5-second flange; 6-load-bearing steel plate; 7-first space; 8-jack; 9-I-beam; 10-cast-in-place waist beam; 11-first wedge block; 12-second wedge block; 13-first channel steel; 14-second channel steel; 15-second steel plate; 16-bolt sleeve; 17-third bolt; 18-second bolt; 19-first bolt; 20-anti-fall steel cable; 21-angle steel; 22-anchor bolt. DETAILED DESCRIPTION

[0037] In order to make the purpose of the invention, technical solutions and beneficial effects of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0038] like Figures 1 to 6 As shown, a connection node structure between a prefabricated support 1 and an underground retaining structure 2 includes a prefabricated support 1 and a retaining structure 2. A first structure is provided between the retaining structure 2 and the prefabricated support 1. The first structure includes a first steel plate 3 connected to the retaining structure 2 and a flange structure connected to the prefabricated support 1. A load-bearing steel plate 6 is connected between the first steel plate 3 and the flange structure. The load-bearing steel plate 6, the first steel plate 3, and the flange structure enclose a first space 7. A jack 8 is provided in the first space 7. Preferably, the first structure is made of steel. The first structure and the flange structure are connected by first bolts 19.

[0039] In the present invention, the enclosure structure 2 includes a continuous wall. The precast supports 1 can be steel supports, precast concrete pipe supports, or precast concrete supports. The flanges, channel steels, and steel plates in the present invention can all be prefabricated in a factory. Preferably, each component is detachably connected to enhance ease of installation. More preferably, the components are bolted together, requiring only tightening of the bolts at the construction site, making construction more convenient. Furthermore, the concrete waist beam provides high overall rigidity and stability.

[0040] When the present invention is used, during the foundation pit construction, a prefabricated support 1 is pre-erected and fixed by an anti-falling steel cable 20. The anti-falling steel cable 20 is connected to an angle steel 21, and the angle steel 21 is connected to the continuous wall in the enclosure structure 2 by an anchor bolt 22.

[0041] After the prefabricated support 1 is erected, the jack 8 can be placed on the load-bearing steel plate 6, and then the axial force can be applied by loosening the bolts and combining the jack 8. When the axial force reaches the expected force, the first wedge block 11 and the second wedge block 12 are wedged in to form a temporary support.

[0042] When the temporary support is completed, the foundation pit excavation and the waist beam casting can be carried out simultaneously without waiting for the age of the cast-in-place waist beam 10. After the concrete waist beam reaches the strength and the supporting axial force is stable, the jack 8 can be taken out.

[0043] During the foundation pit reconstructing phase, the jack 8 is put back in to unload the prefabricated support 1. After unloading, the bolts are removed and all the prefabricated supports 1 can be recovered.

[0044] The first structure forms a U-shaped structure for accommodating jacks 8. When the supporting axial force decreases, jacks 8 can be deployed at any time to strengthen the support for the retaining structure 2. Throughout the construction process, axial force can be applied at any time to ensure the stability of the foundation pit. After applying axial force, jacks 8 can be removed for use in other locations or other projects.

[0045] In some embodiments of the present invention, a plurality of profiles are connected between the enclosure structure 2 and the first steel plate 3, and one end of the plurality of profiles is connected to the enclosure structure 2 through the first channel steel 13. Furthermore, the outside of the profile is wrapped with a cast-in-place waist beam 10. In the present invention, the profile can be a C-shaped steel, H-shaped steel or other profiles. Preferably, the profile is an I-shaped steel 9. Since the back of the I-shaped steel 9 cannot be tightly connected to the enclosure structure 2, in the present invention, when the first structural support node of the I-shaped steel 9+steel material is adopted, the I-shaped steel 9 waist beam and the steel support in the project have minimal restrictions on the foundation pit. In some embodiments of the present invention, a third channel steel is provided at the connection between the profile and the enclosure structure 2, and a second wedge block 12 is provided between the third channel steel and the enclosure structure 2.

[0046] Furthermore, the profile is connected to the cast-in-place waist beam 10 via a bolt sleeve 16 and a third bolt 17, with the bolt sleeve 16 inserted into the cast-in-place waist beam 10. The first structure of the present invention is connected to the enclosure 2 via the third bolt 17. The bolt sleeve 16 is also sleeved onto the third bolt 17, further ensuring its strength and extending its range.

[0047] In detail, in the prior art, when using cast-in-place nodes, the foundation pit is excavated to the design elevation, and concrete support must be applied while waiting for the concrete to age. During this period, a time effect occurs, resulting in excessive deformation of the foundation pit. In the present invention, under the action of the first structure, a pre-loaded gravity is applied to the enclosure structure 2 before the cast-in-place waist beam 10 is poured. The present invention uses a concrete waist beam to ensure that the prefabricated support 1 is closely attached to the enclosure structure 2, solving the problem of loose connection between the steel support waist beam and the enclosure structure 2. Moreover, the first structure solves the problem of waiting for the age of the cast-in-place concrete structure. Once the profile, first channel steel 13, jack 8, wedge block, etc. are constructed, a support function can be immediately formed, shortening the construction time and improving the construction effect.

[0048] In some embodiments of the present invention, the flange structure includes a first flange 4 prefabricated as an integral part with the prefabricated support 1 and a second flange 5 connected to the first flange 4. The second flange 5 is detachably connected to the first flange 4 and the prefabricated support 1 as a whole by a first bolt 19.

[0049] In some embodiments of the present invention, the first space 7 also includes two second channel steels 14 connecting the first steel plate 3 and the flange structure. The two second channel steels 14, the load-bearing steel plate 6, the first steel plate 3 and the flange structure form the first space 7, thereby preventing the jack 8 from falling out of the first space 7 during operation.

[0050] Furthermore, a second steel plate 15 is provided on the inner side of each of the two second channel steels 14. The second steel plate 15 and the second channel steel 14 are connected by a second bolt 18. A first wedge 11 is provided at the connection between the second steel plate 15 and the first steel plate 3. Preferably, the second steel plate 15 and the load-bearing steel plate 6 are both plugging steel plates.

[0051] In detail, as an embodiment of the present invention, in the present invention, the prefabricated support 1 and the first structure are connected by a flange structure and bolts, and the bolts and flanges can be removed as needed. During foundation pit construction, the prefabricated support 1 can be pre-assembled on the ground.

[0052] Preferably, the second steel plate 15 is connected to the second channel steel 14 via a second bolt 18 , and the prefabricated support 1 is connected to the flange structure via a first bolt 19 .

[0053] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work shall fall within the scope of protection of the present invention.

Claims

1. A connection node structure between a prefabricated support and an underground enclosure structure, comprising a prefabricated support and an enclosure structure, characterized in that: A first structure is provided between the enclosure structure and the prefabricated support, the first structure comprising a first steel plate connected to the enclosure structure and a flange structure connected to the prefabricated support, a load-bearing steel plate is connected between the first steel plate and the flange structure, the load-bearing steel plate, the first steel plate and the flange structure enclose a first space, and a jack is provided in the first space; A plurality of profiles are connected between the enclosure structure and the first steel plate, and one end of the plurality of profiles is connected to the enclosure structure through a first channel steel; The first space further includes at least one first wedge connected to the first steel plate; The first space further includes two second channel steels connecting the first steel plate and the flange structure, and the two second channel steels, the load-bearing steel plate, the first steel plate and the flange structure enclose the first space; A second steel plate is provided on the inner side of each of the two second channel steels, and the first wedge block is provided at the connection between the second steel plate and the first steel plate.

2. The connection node structure of the prefabricated support and underground enclosure structure according to claim 1 is characterized in that: The profile is an I-beam.

3. The connection node structure of the prefabricated support and underground enclosure structure according to claim 1 is characterized in that: A third channel steel is provided at the connection between the profile and the enclosure structure, and a second wedge block is provided between the third channel steel and the enclosure structure.

4. The connection node structure of the prefabricated support and underground enclosure structure according to claim 1 is characterized in that: The flange structure includes a first flange prefabricated integrally with the prefabricated support and a second flange connected to the first flange.

5. The connection node structure of the prefabricated support and underground enclosure structure according to claim 1 is characterized in that: The second steel plate and the load-bearing steel plate are both plugging steel plates.

6. The connection node structure of the prefabricated support and underground enclosure structure according to claim 1 is characterized in that: The prefabricated support is a steel support, a prefabricated concrete pipe support or a prefabricated concrete support.

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