CN208219670U - A kind of support system of deep basal pit - Google Patents

Abstract

The utility model relates to a support system for a deep foundation pit, which belongs to the field of geotechnical engineering and solves the problem that connecting rods are easily damaged. A cross bar is fixed on the guard plate, a connecting rod is arranged between the cross bars on two adjacent guard plates, a mounting plate is arranged on the side wall of the cross bar close to the center of the foundation pit, and the two ends of the connecting rod are provided with The connecting part is hinged to the mounting plate. Because the connecting rod and the cross bar are hinged, the connecting rod will only be subjected to axial stress, and avoid bending stress and shear stress, prevent the connecting rod from being easily damaged, and prolong the service life of the connecting rod. The axial stresses cancel each other out to strengthen the structural strength of the cross bar and increase its ability to resist deformation. The function of the cross bar and the connecting rod strengthens the supporting effect of the guard plate on the foundation pit and ensures the stability of the support.

Description

A support system for deep foundation pit

technical field

The utility model relates to the field of geotechnical engineering, in particular to a support system for deep foundation pits.

Background technique

Deep foundation pit refers to a project where the excavation depth exceeds 5 meters or the basement has more than three floors, or the depth does not exceed 5 meters, but the geological conditions, surrounding environment and underground pipelines are particularly complicated. The foundation pit support is to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, and the support, reinforcement and protection measures adopted for the side wall of the foundation pit and the surrounding environment.

At present, for excavated deep foundation pits, the support system of internal support mainly adopts the structure of supporting piles and lattice columns. The lattice column needs to be welded by electric welding during processing, and the exhaust gas pollution and light pollution produced by it are harmful to the human body. When the support pile is constructed, the drilling rig will produce exhaust gas pollution, and the mud used in the construction will pollute the surrounding soil, and the support pile The water-stop effect of the water-stop slab is difficult to guarantee. At the same time, when pouring the support beams, the lattice columns are often filled with concrete, which brings unnecessary troubles to the later demolition.

The traditional deep foundation pit steel support constraint node structure is a fixed constraint. Generally, bolts are used to directly connect the cross bar to the connecting rod connecting the cross bar. This connection method makes the connecting rod not only subjected to axial pressure but also to bending stress and shear stress, the connecting rod is easily damaged, reducing the service life of the connecting rod.

Utility model content

The purpose of the utility model is to provide a support system for a deep foundation pit, which has the advantages of avoiding bending stress and shear stress on the connecting rods of the deep foundation pit, and prolonging its service life.

The above-mentioned technical purpose of the utility model is achieved through the following technical solutions:

A support system for a deep foundation pit, comprising a plurality of protective plates arranged around the foundation pit to bear the pressure of the foundation pit, each of the protective plates is fixed with a cross bar, and the cross bar on two adjacent guard plates A connecting rod is arranged between them, and a mounting plate is arranged on the side wall of the cross bar close to the center of the foundation pit, and connecting parts are arranged at both ends of the connecting rod, and the connecting parts are hinged to the mounting board.

Implementing the above technical scheme, the compressive stress of the foundation pit soil is transmitted to the guard plate, the guard plate transmits the stress to the cross bar, and the cross bar then transmits the stress to the connecting rod. Because the connecting rod and the cross bar are hinged, the connecting rod will only be affected by the axial force. Stress, avoid bending stress and shear stress, prevent the connecting rod from being easily damaged, prolong the service life of the connecting rod, and the axial stress transmitted to the connecting rod by two adjacent cross bars cancel each other out, so as to strengthen the structural strength of the cross bar, To increase its ability to resist deformation, the function of the cross bar and the connecting rod strengthens the supporting effect of the guard plate on the foundation pit and ensures the stability of the support.

Preferably, the mounting plate includes an upper mounting plate and a lower mounting plate, the upper mounting plate and the lower mounting plate are provided with mounting holes along the same vertical axis, a hinge shaft is pierced in the mounting hole, and the The connecting part includes a connecting plate, and the connecting plate is located between the upper mounting plate and the lower mounting plate, and a connecting hole is opened on the connecting plate, and the hinge shaft passes through the mounting hole and the connecting hole to make the connecting plate and the mounting plate Hinged, the top of the hinged shaft is fixed with a limiting platform to prevent the hinged shaft from slipping.

To implement the above technical solution, when installing, put the connecting plate of the connecting rod between the upper mounting plate and the lower mounting plate, and adjust the position of the connecting plate so that the connecting hole is aligned with the mounting hole, and insert the hinge shaft from the mounting hole of the upper mounting plate In order to achieve the purpose of connecting the mounting plate and the connecting plate, avoid the connecting rod from being subjected to bending stress and shear stress, and prolong its service life, and the limit table prevents the hinge shaft from falling under the action of gravity.

Preferably, the end of the hinge shaft away from the stopper is screwed with a fastening ring, and the fastening ring abuts against the lower mounting plate.

Implement the above technical solution, when the connecting plate is connected to the mounting plate, screw the fastening ring to the hinged shaft to limit the position of the hinged shaft, thereby effectively preventing the hinged shaft from detaching from the mounting hole and ensuring the stability and reliability of the connection .

Preferably, the upper mounting plate and the lower mounting plate are fixedly connected with a fixed plate at one end close to the cross bar, the fixed plate is attached to the side wall of the cross bar, and a through hole is opened on the fixed plate, and the through hole A fixing bolt is provided for rotation, and a threaded hole is provided on the side wall of the cross bar, and the fixing bolt is threadedly connected with the threaded hole so that the fixing plate is fixed on the cross bar.

Implement the above-mentioned technical scheme, when installing, fit the fixing plate and the side wall of the cross bar, and make the through hole communicate with the threaded hole, rotate the fixing bolt, so that the fixing bolt is threadedly connected with the threaded hole, so as to achieve the purpose of fixing the fixing plate. Board installation is easy and secure.

Preferably, the connecting rod and the two cross bars form a triangular reinforcing structure, and the cross bar is fixedly provided with a baffle that presses against the fixing plate in the direction of the triangular reinforcing structure.

Implement the above technical scheme, the fixed plate will be under the axial pressure of the connecting rod, and the fixed plate will be fixedly connected with the cross bar through the fixed bolt, the fixed bolt will be subjected to the shear force along the direction of the cross bar, and the shear force will destroy the connection between the fixed bolt and the cross bar. The connection of the threaded holes causes the fixing bolts to loosen or even fail, and the setting of the baffle offsets part of the component force on the fixing plate along the direction of the cross bar, prevents the fixing bolts from failing to a certain extent, and enhances the fixing effect of the fixing plate.

Preferably, a reinforcing rib is fixedly connected between the baffle and the cross bar.

Implementing the above technical solution, the arrangement of the reinforcing ribs enhances the structural strength of the baffle and effectively prevents the baffle from being bent and deformed.

Preferably, the guard plate is bent multiple times to form several grooves and bosses.

Implementing the above technical solution, the guard plate is bent to form grooves and bosses, which strengthens the bending resistance of the guard plate, prevents the guard plate from being easily deformed by the pressure of the soil of the foundation pit, and ensures sufficient protection ability of the guard plate.

Preferably, a plurality of cross bars are arranged in parallel along the height direction of the guard plate.

Implementing the above technical solution, multiple cross bars are provided, which enhances the strengthening effect of the cross bars on the structural strength of the guard plate, and improves the protective ability of the guard plate.

In summary, the utility model has the beneficial effects compared with the prior art as follows:

1. The compressive stress of the foundation pit soil is transmitted to the guard plate, the guard plate transmits the stress to the cross bar, and the cross bar then transmits the stress to the connecting rod. Because the connecting rod and the cross bar are hinged, the connecting rod will only be subjected to axial stress, while Avoid bending stress and shear stress, prevent the connecting rod from being easily damaged, prolong the service life of the connecting rod, and the axial stress transmitted to the connecting rod by two adjacent cross bars cancel each other out, so as to strengthen the structural strength of the cross bar and increase its resistance The ability to deform, the function of the cross bar and the connecting rod strengthens the supporting effect of the guard plate on the foundation pit and ensures the stability of the support;

2. The fixed plate will be under the axial pressure of the connecting rod, and the fixed plate will be fixedly connected with the cross bar through the fixed bolt. The fixed bolt will be subjected to the shear force along the direction of the cross bar, and the shear force will destroy the connection between the fixed bolt and the threaded hole. The connection will cause the fixing bolts to loosen or even fail, and the setting of the baffle offsets part of the force component along the direction of the cross bar received by the fixing plate, prevents the fixing bolt from failing to a certain extent, and enhances the fixing effect of the fixing plate.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is the overall structural representation of the utility model embodiment;

Fig. 2 is the explosion diagram of the utility model embodiment;

Fig. 3 is an enlarged view of part A in Fig. 2 .

Reference signs: 1, guard plate; 11, groove; 12, boss; 2, cross bar; 21, mounting plate; 211, upper mounting plate; 212, lower mounting plate; 213, mounting hole; 22, fixing plate ; 221, through hole; 2211, fixing bolt; 23, threaded hole; 24, baffle plate; 241, reinforcing rib plate; 3, connecting rod; 31, connecting plate; 311, connecting hole; 42. Fastening ring; 5. Triangular reinforcement structure.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail.

This specific embodiment is only an explanation of the utility model, and it is not a limitation of the utility model. Those skilled in the art can make modifications to the embodiment without creative contribution according to needs after reading this specification, but as long as they are within the utility model All new claims are protected by patent law.

Example:

As shown in Figure 1, a support system for a deep foundation pit includes a plurality of protective plates 1 arranged around the foundation pit to bear the pressure of the foundation pit, see Figure 3, the protective plates 1 are bent multiple times to form a number of grooves 11 and the boss 12; the guard plate 1 is bent to form a groove 11 and a boss 12, which strengthens the bending resistance of the guard plate 1, prevents the guard plate 1 from being easily deformed by the pressure of the foundation pit soil, and ensures that the guard plate 1 adequate protection. Each guard plate 1 is fixed with a crossbar 2, and a plurality of crossbars 2 are arranged in parallel along the height direction of the guard plate 1; to enhance the strengthening effect of the crossbar 2 on the structural strength of the guard plate 1, and improve the protective ability of the guard plate 1 .

As shown in Figures 2 and 3, a connecting rod 3 is provided between the cross bars 2 on two adjacent guard plates 1, and a mounting plate 21 is provided on the side wall of the cross bar 2 close to the center of the foundation pit, and the two ends of the connecting rod 3 are provided There is a connecting portion, and the connecting portion is hinged with the mounting plate 21 .

As shown in Figures 2 and 3, the mounting plate 21 includes an upper mounting plate 211 and a lower mounting plate 212. On the upper mounting plate 211 and the lower mounting plate 212 and along the same vertical axis, a mounting hole 213 is opened, and the mounting hole 213 is penetrated. There is a hinged shaft 4, the connecting portion includes a connecting plate 31, and the connecting plate 31 is located between the upper mounting plate 211 and the lower mounting plate 212, the connecting plate 31 is provided with a connecting hole 311, and the hinged shaft 4 passes through the mounting hole 213 and the connecting hole 311 so that the connecting plate 31 and the mounting plate 21 are hinged, the top of the hinge shaft 4 is fixedly provided with a limiter 41 to prevent the hinge shaft 4 from slipping, and the end of the hinge shaft 4 away from the limiter 41 is screwed with a fastening ring 42. The ring 42 abuts against the lower mounting plate 212; when the connecting plate 31 is connected to the mounting plate 21, the fastening ring 42 is screwed to the hinge shaft 4 to limit the position of the hinge shaft 4, thereby effectively preventing the hinge shaft 4 from being disengaged from the installation upwards. The hole 213 ensures the stability and reliability of the connection.

Specific process: Put the connecting plate 31 of the connecting rod 3 between the upper mounting plate 211 and the lower mounting plate 212, and adjust the position of the connecting plate 31 so that the connecting hole 311 is aligned with the mounting hole 213, and the mounting hole of the upper mounting plate 211 213 is inserted into the hinge shaft 4 to achieve the purpose of connecting the mounting plate 21 to the connecting plate 31 . The compressive stress of the foundation pit soil is transmitted to the guard plate 1, and the guard plate 1 transmits the stress to the cross bar 2, and the cross bar 2 then transmits the stress to the connecting rod 3. Because the connecting rod 3 and the cross bar 2 are hinged, the connecting rod 3 will only be subjected to Axial stress, avoiding bending stress and shear stress, preventing the connecting rod 3 from being easily damaged, prolonging the service life of the connecting rod 3; and the axial stresses transmitted to the connecting rod 3 by two adjacent cross bars 2 cancel each other out, so as to achieve Strengthen the structural strength of the crossbar 2 and increase its ability to resist deformation, and the function of the crossbar 2 and the connecting rod 3 strengthens the supporting effect of the guard plate 1 on the foundation pit to ensure the stability of the support.

As shown in Figures 2 and 3, the upper mounting plate 211 and the lower mounting plate 212 are fixedly connected to one end of the cross bar 2 with a fixed plate 22, the fixed plate 22 is attached to the side wall of the cross bar 2, and the fixed plate 22 is provided with a through hole 221, the through hole 221 is rotated with a fixed bolt 2211, the side wall of the cross bar 2 is provided with a threaded hole 23, the fixed bolt 2211 is threaded with the threaded hole 23 so that the fixed plate 22 is fixed on the cross bar 2.

When installing the mounting plate 21, the fixing plate 22 is attached to the side wall of the cross bar 2, and the through hole 221 is communicated with the threaded hole 23, and the fixing bolt 2211 is rotated so that the fixing bolt 2211 is threadedly connected with the threaded hole 23, so as to achieve fixed The purpose of the plate 22 is that the fixed plate 22 is easy and firm to install.

As shown in Figures 2 and 3, the connecting rod 3 and the two cross bars 2 form a triangular reinforcement structure 5, and the cross bar 2 is fixedly provided with a baffle plate 24 that presses against the fixed plate 22 in the direction of the triangular reinforced structure 5; the fixed plate 22 will be subjected to The axial pressure of the connecting rod 3, while the fixed plate 22 is fixedly connected with the cross bar 2 through the fixing bolt 2211, the fixing bolt 2211 will be subjected to the shear force along the direction of the cross bar 2, and the shear force will destroy the threaded hole of the fixing bolt 2211 23 connection, causing the fixing bolt 2211 to loosen or even fail, and the setting of the baffle plate 24 offsets the force component along the direction of the cross bar 2 received by a part of the fixing plate 22, prevents the fixing bolt 2211 from failing to a certain extent, and strengthens the strength of the fixing plate 22. fixed effect.

As shown in FIGS. 2 and 3 , in order to enhance the structural strength of the baffle 24 and effectively prevent the baffle 24 from bending and deformation, a reinforcing rib 241 is fixedly connected between the baffle 24 and the cross bar 2 .

The above descriptions are only exemplary implementations of the present utility model, and are not intended to limit the protection scope of the present utility model, which is determined by the appended claims.

Claims (8)

1. A support system for a deep foundation pit is characterized in that it comprises a plurality of guard plates (1) arranged around the foundation pit for receiving the pressure of the foundation pit, and each said guard plate (1) is fixedly provided with a horizontal Rod (2), a connecting rod (3) is arranged between the cross bars (2) on two adjacent guard plates (1), and a mounting plate ( 21), the two ends of the connecting rod (3) are provided with connecting parts, and the connecting parts are hinged to the mounting plate (21). 2. The support system of a kind of deep foundation pit according to claim 1, is characterized in that, described mounting plate (21) comprises upper mounting plate (211) and lower mounting plate (212), and described upper mounting plate ( 211) and the lower mounting plate (212) and along the same vertical axis are provided with a mounting hole (213), the hinge shaft (4) is pierced in the mounting hole (213), and the connecting part includes a connecting plate (31 ), and the connecting plate (31) is located between the upper mounting plate (211) and the lower mounting plate (212), the connecting plate (31) is provided with a connecting hole (311), and the hinge shaft (4) Pass through the mounting hole (213) and the connecting hole (311) so that the connecting plate (31) and the mounting plate (21) are hinged, and the top of the hinged shaft (4) is fixed with a limiter to prevent the hinged shaft (4) from slipping (41). 3. The supporting system of a deep foundation pit according to claim 2, characterized in that, one end of the hinged shaft (4) away from the stopper (41) is threadedly connected with a fastening ring (42), the The fastening ring (42) abuts against the lower mounting plate (212). 4. The support system of a deep foundation pit according to claim 3, characterized in that, the upper mounting plate (211) and the lower mounting plate (212) are fixedly connected with a fixed plate near one end of the cross bar (2) (22), the fixed plate (22) is attached to the side wall of the cross bar (2), the fixed plate (22) is provided with a through hole (221), and the fixed plate (221) is rotated inside the through hole (221). Bolt (2211), the side wall of the cross bar (2) is provided with a threaded hole (23), and the fixing bolt (2211) is threadedly connected with the threaded hole (23) so that the fixing plate (22) is fixed on the cross bar (2 )superior. 5. A support system for a deep foundation pit according to claim 4, characterized in that, said connecting rod (3) and two cross bars (2) form a triangular reinforcement structure (5), and said cross bar (2) ) is fixedly provided with a baffle plate (24) that presses against the fixed plate (22) in the direction of the triangular reinforcement structure (5). 6. A support system for a deep foundation pit according to claim 5, characterized in that, a reinforcing rib (241) is fixedly connected between the baffle plate (24) and the cross bar (2). 7. A support system for a deep foundation pit according to claim 1, characterized in that the guard plate (1) is bent multiple times to form several grooves (11) and bosses (12). 8. A support system for a deep foundation pit according to claim 1, characterized in that a plurality of cross bars (2) are arranged in parallel along the height direction of the guard plate (1).