1. The utility model provides a device is applyed to assembled prestressing force for foundation ditch steel bearing structure which characterized in that: the device be fixed in outside steel bearing structure's support node mounted position department, including main connecting body and vice connecting body and main connecting body between still be equipped with the jack, through the jack support respectively and tightly vice connecting body and main connecting body and exert prestressing force, main connecting body on be equipped with well sliding tooth plate, vice connecting body on be equipped with end sliding tooth plate, two toothed plates realize through intermeshing between main connecting body and the vice connecting body applying prestressing force back relative position's locking work.

2. The fabricated prestress applying device for the foundation pit steel support structure according to claim 1, wherein: the main connecting body on be equipped with a plurality of end cylinders and end baffle that are used for fixed well sliding tooth board, well sliding tooth board on be equipped with end cylinder quantity assorted second waist type hole to correspond the suit in end cylinder on, restrict well sliding tooth board lateral sliding in the main connecting body, end baffle for two baffles listed in well sliding tooth board both sides, with well sliding tooth board limit in the relevant position department of main connecting body, and be used for transmitting and exert the axial load that the prestressing direction is unanimous, vice connecting body corresponding position department at well sliding tooth board be equipped with end sliding tooth board, end sliding tooth board have the return double-screw bolt, adopt the return nut to lock after passing the first waist type hole that sets up in the vice connecting body, first waist type hole side is equipped with the bolt hole, end sliding tooth board is supported tightly to end sliding tooth board to end screw bolt hole and the intermeshing realization of the relative position between main connecting body and the vice connecting body Stopping working.

3. The fabricated prestress applying device for the foundation pit steel support structure according to claim 1 or 2, wherein: the line direction of the central axis after the main connecting body and the auxiliary connecting body are installed and two adjacent supporting nodes of the steel supporting structure are on the same straight line, a pair of end sliding toothed plates with the same structure and a pair of structures formed by the middle sliding toothed plates are symmetrically arranged on two sides of the connecting line, a spring assembly formed by a plurality of stainless steel springs is arranged between the two structures formed by the two sliding toothed plates in a meshing mode, the middle sliding toothed plates are transversely movable by resilience force provided by the spring assembly, the stop bolts are symmetrically arranged on two sides of the return double-screw bolts, and two bolt holes are correspondingly formed in two sides of a first waist-shaped hole in the auxiliary connecting body.

4. The fabricated prestress applying device for the foundation pit steel support structure according to claim 1 or 2, wherein: the auxiliary connecting body is of a steel frame structure and is provided with a movable vacancy for limiting the displacement of the main connecting body, the main connecting body penetrates into the movable vacancy to form an integrated device which can perform relative displacement movement along the direction of applying prestress with the auxiliary connecting body, the auxiliary connecting body is provided with an installation region of a jack at the other end of the region for installing the main connecting body, one end of the jack is abutted against the inner side wall of a connecting panel of the auxiliary connecting body, the other end of the jack is abutted against a loading support arranged at the central position of the end part of the main connecting body to apply prestress, a displacement meter for connecting the auxiliary connecting body and the main connecting body is arranged beside the jack, the bottom of a frame of the auxiliary connecting body is provided with a bottom plate, the top region of a left sliding tooth plate structure of the auxiliary connecting body is provided with a detachable cover plate, and the detachable cover plate is fixed on the frame of the auxiliary connecting body through a fixing bolt, and a cover plate with a rotating shaft is arranged in the mounting area of the jack on the right side of the auxiliary connecting main body.

5. The fabricated prestress applying device for the foundation pit steel support structure according to claim 1 or 2, wherein: the outer side surfaces of the main connecting body and the auxiliary connecting body are connecting surfaces for connecting external structures, and a plurality of connecting bolt holes are respectively arranged on the connecting surfaces.

6. The fabricated prestress applying device for the foundation pit steel support structure according to claim 1 or 2, wherein: the device adopts solid steel's main connecting body, vice connecting body, well sliding tooth board and end sliding tooth board, all is equipped with anticorrosive coating with each surface of outside contact, and each sliding contact face is smooth in the device to the coating has lubricating oil.

Background

For foundation pit projects with wide excavation range, large depth and complex geological conditions, the required support system is huge and the project cost is high. In addition, the pit bottom soil body is in an unloading resilience state in the excavation process of the foundation pit, the internal stress of the pit bottom soil body is redistributed, the stress and deformation of the soil body around the foundation pit can be changed continuously, the traditional steel supporting structure system is difficult to meet the deformation requirement in the excavation process of the foundation pit, and the prestress loss exists, so that the strong demand of the fabricated prestress steel supporting structure capable of maintaining the prestress is generated. However, the prestress applying structure in the prior art has various defects, such as complex equipment, high manufacturing cost, complex installation process, poor structure reliability, difficult maintenance and the like. Some prestress applying structures cannot adjust prestress in time when a foundation pit is deformed greatly after being preloaded before construction, or hydraulic oil cylinders are required to work continuously to maintain prestress and the like, so that equipment and maintenance cost is high, and the prestress applying structures are not suitable for being used in large quantities.

Therefore, the device for applying the prestress to the steel supporting structure of the foundation pit, which is reliable in structure, simple in component, convenient to load, economic and safe, and convenient to install and maintain, is further designed, and the effective regulation and control of the deformation of the enclosure structure of the foundation pit dug in a deep and large foundation pit and a complex geological condition are very necessary.

Disclosure of Invention

The invention aims to overcome the defects in the prior art, and provides an assembly type prestress applying structure device for a foundation pit steel support, which is an assembly type foundation pit steel support prestress applying structure which adopts a mechanical structure, is reliable in structure and simple in loading, can flexibly provide prestress and control foundation pit deformation, is simple in installation and maintenance, improves construction efficiency, can be repeatedly used, can be cooperatively used by combining axial force monitoring, and can further reduce use cost.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a device is applyed to assembled prestressing force for foundation ditch steel bearing structure which characterized in that: the assembled prestress applying device comprises a main connecting body, an auxiliary connecting body, a sliding toothed plate meshing locking assembly and a jack, and can apply prestress to an external connecting structure such as a steel support, so that the support effect on the building envelope is optimized.

The device be fixed in outside steel bearing structure's support node mounted position department to adopt high strength bolt and external connecting piece to be connected fixedly, including main connecting body and vice connecting body and main connecting body between still be equipped with the jack, the jack be loading device, optional hydraulic jack or other loading device, through the jack support respectively and tightly vice connecting body and main connecting body and exert the prestressing force, main connecting body on be equipped with well fishback, vice connecting body on be equipped with end fishback, two fishbacks realize through intermeshing between main connecting body and the vice connecting body applying prestressing force back relative position's locking work.

The main connecting body is provided with a plurality of stop cylinders and stop partition plates for fixing the middle sliding toothed plate. The stop cylinders are welded on the main connecting body by adopting high-strength steel cylinders, second waist-shaped holes matched with the stop cylinders in number are formed in the middle sliding tooth plate, the length of each second waist-shaped hole is equal to the height of the sliding tooth on the middle sliding tooth plate, the second waist-shaped holes are correspondingly sleeved on the stop cylinders, and the middle sliding tooth plate on the main connecting body is limited to slide transversely. The stop partition plates are two partition plates which are respectively arranged on two sides of the middle sliding tooth plate, are solid steel bodies and have enough thickness, are welded on the main connecting main body, can limit the middle sliding tooth plate at the corresponding position of the main connecting main body, are used for transmitting axial load consistent with the prestress applying direction and are not damaged when the axial load is transmitted.

Vice joint connection main part the corresponding position department of well fishback be equipped with end fishback, end fishback have the return double-screw bolt, the return double-screw bolt be threaded high strength solid steel cylinder, pass and lock with the return nut behind the first waist type hole that sets up in vice joint connection main part first waist type hole side is equipped with the bolt hole, end bolt screw in bolt hole supports tight end fishback and makes end fishback and well fishback intermeshing realize the locking work of relative position between main joint connection main part and vice joint connection main part. When the end sliding tooth plate is completely separated from the middle sliding tooth plate, the stop cylinder just contacts with one side of the near tooth surface of the waist-shaped hole of the middle sliding tooth plate, and when the end sliding tooth plate is meshed with the middle sliding tooth plate, the stop cylinder just contacts with the other side of the waist-shaped hole on the middle sliding tooth plate.

The connecting line directions of the central axis after the main connecting body and the auxiliary connecting body are installed and two adjacent supporting nodes of the steel supporting structure are on the same straight line, a pair of structures with the same structure and formed by the end sliding toothed plate and the middle sliding toothed plate are symmetrically arranged, a spring assembly formed by a plurality of stainless steel springs is arranged between the two middle sliding toothed plates, the sliding toothed plates are meshed with the end sliding toothed plate in the loading process, and resilience force can be provided to enable the middle sliding toothed plate to move transversely in a reciprocating mode. The stop bolts are symmetrically arranged on two sides of the return stud, and two bolt holes are correspondingly arranged on two sides of the first waist-shaped hole in the auxiliary connecting main body.

The auxiliary connecting body is of a steel frame structure and is provided with a movable hole position for limiting the displacement of the main connecting body, the main connecting body penetrates into the movable vacancy and then forms an integrated device which can perform relative displacement movement along the direction of applying prestress with the auxiliary connecting body, the other end of the area for installing the main connecting body is provided with an installation area of a jack, one end of the jack abuts against the inner side wall of the connecting panel of the auxiliary connecting body, the other end of the jack abuts against a loading support arranged at the central position of the end part of the main connecting body to apply prestress, a displacement meter for connecting the auxiliary connecting body and the main connecting body is arranged beside the jack, and the displacement meter needs to have enough stroke. In the process of supporting the foundation pit, the prestress loading can be synchronously matched with the displacement and axial force monitoring flexible loading of the steel supporting structure of the foundation pit, and the jack can be taken out after the loading is finished.

The bottom plate is arranged at the bottom of the frame of the auxiliary connecting body, the bottom plate is made of a solid steel plate and is fixed on the auxiliary connecting body through welding or bolt connection, the thickness of the end sliding tooth plate is the same as that of the middle sliding tooth plate, and a supporting plate in contact with the bottom plate needs to be arranged below the end sliding tooth plate to guarantee stable work of the end sliding tooth plate. The surface of the auxiliary connecting body is provided with a detachable cover plate in the region for installing the main connecting body, the detachable cover plate is fixed on the frame of the auxiliary connecting body through a fixing bolt, and the region for installing the jack is provided with the cover plate with a rotating shaft. The thickness of the middle sliding tooth plate on the main connecting body is smaller than or equal to the distance between the contact surface of the middle sliding tooth plate and the main connecting body and the detachable cover plate, so that the moving space of the middle sliding tooth plate is ensured.

The outer side faces of two ends of the main connecting body and the auxiliary connecting body are connecting faces, and a plurality of connecting bolt holes used for connecting an external structure are respectively arranged on the connecting faces. The device adopts solid steel's main connecting body, vice connecting body, well fishback and end fishback, and each surface with outside contact all is equipped with anticorrosive coating or adopts other anti-corrosion measures, and each sliding contact face is smooth in the device to scribble lubricating oil.

Compared with the prior art, the invention has the beneficial effects that: the device adopts a mechanical structure, has higher rigidity, can flexibly apply prestress by combining foundation pit deformation and steel support axial force monitoring, can effectively control foundation pit deformation, improves the safety and stability of a foundation pit supporting structure, effectively controls the deformation of surrounding soil, and reduces the influence of excavation on the environmental deformation of adjacent buildings (structures) and the like. The invention has simple component form, enough rigidity and strength, real-time controllable prestress loading, convenient installation, disassembly, maintenance and overhaul, cyclic utilization and good use and popularization value.

Drawings

Fig. 1 is a schematic sectional view showing a prestress applying device according to the present invention.

FIG. 2 is a schematic top view of the main connecting body of the present invention.

FIG. 3 is a side view of the main connecting body of the present invention.

Fig. 4 is a schematic sectional view of the secondary connecting body according to the present invention.

FIG. 5 is a side view of the secondary connecting body of the present invention.

FIG. 6 is a top view of the secondary connecting body of the present invention.

FIG. 7 is a schematic diagram of a structure of a middle sliding tooth plate according to the present invention.

FIG. 8 is a schematic diagram of an end-sliding tooth plate structure according to the present invention.

In the figure: 10. a main connecting body; 11. A first connecting bolt hole; 12. A stop cylinder; 13. A stop baffle plate; 14. Loading a support; 20. A secondary connecting body; 21. Bolt holes; 22. A first kidney-shaped hole; 23. A base plate; 24. A second connecting bolt hole; 25. A top plate; 26. A rotating shaft; 27. A cover plate; 28. Fixing the bolt; 29. A detachable cover plate; 30. A middle sliding toothed plate; 31. A second kidney-shaped hole; 40. An end sliding toothed plate; 41. Returning the screw cap; 42. A return stud; 50. A spring assembly; 60. A stop bolt; 70. A displacement meter; 80. A jack.

Detailed Description

The present invention will be described in further detail below with reference to specific embodiments in conjunction with the accompanying drawings. The present application may be embodied in many different forms and is not limited to the implementations described in the present embodiments. The following detailed description is provided for the purpose of providing a clear and thorough understanding of the present teachings, wherein words such as upper, lower, left, right, etc. refer to directional terms only when a structure is shown in a corresponding figure.

The invention relates to an assembly type prestress applying structure device for a foundation pit steel support, which can be flexibly arranged at a steel support structure node through the locking of a toothed plate and effectively control the deformation of a foundation pit by adjusting the support prestress.

According to the attached drawings 1-8, the device comprises a main connecting body 10 and an auxiliary connecting body 20, wherein a middle sliding toothed plate 30 is arranged on the main connecting body 10, an end sliding toothed plate 40 is arranged on the auxiliary connecting body 20, and the two toothed plates are meshed with each other to realize the locking work of the relative position between the main connecting body 10 and the auxiliary connecting body 20.

The main connecting body 10 is provided with a plurality of stop cylinders 12 and stop partition plates 13 for fixing the middle sliding tooth plate 30, the middle sliding tooth plate 30 is provided with second kidney-shaped holes 31 matched with the stop cylinders 12 in number and correspondingly sleeved on the stop cylinders 12, and the stop partition plates 13 are two partition plates respectively arranged at two sides of the middle sliding tooth plate 30 and limit the middle sliding tooth plate 30 at the corresponding position of the main connecting body 10.

Vice connecting element 20 be equipped with end sliding rack 40 in the corresponding position department of well sliding rack 30, end sliding rack 40 have return stud 42, the return stud 42 passes and locks with return nut 41 behind the first waist type hole 22 that sets up on vice connecting element 20, for the dismouting of being convenient for, first waist type hole 22 is smooth through-hole, and its aperture is greater than the pole footpath of return stud 42, and is less than return nut 41's external diameter first waist type hole 22 side is equipped with bolt hole 21, and end bolt 60 screw in bolt hole 21 supports tight end sliding rack 40 and can make end sliding rack 40 and well sliding rack 30 intermeshing locking.

In order to ensure that prestress is stably applied, the connecting line directions of the central axis after the main connecting body 10 and the auxiliary connecting body 20 are installed and two adjacent support nodes of the steel support structure are on the same straight line, a pair of end sliding toothed plates 40 with the same structure and a pair of structures which are mutually meshed and locked with each other with the middle sliding toothed plate 30 are symmetrically arranged on two sides, and a spring assembly 50 consisting of a plurality of stainless steel springs is arranged between the two structures which are meshed and locked and at the middle sliding toothed plate 30. The stop bolts 60 are symmetrically arranged in pairs at two sides of the return stud 42, and two bolt holes 21 are correspondingly arranged at two sides of the first kidney-shaped hole 22 on the auxiliary connecting body 20.

In order to facilitate the disassembly, assembly and movement of the device, the auxiliary connecting body 20 is of a steel frame structure and is provided with a movable hole position for limiting the displacement of the main connecting body 10, and the main connecting body 10 penetrates into the movable hole position and then forms an integrated device capable of performing relative displacement movement along the prestress applying direction with the auxiliary connecting body 20. The other end of the region where the main connecting body 10 is installed of the auxiliary connecting body 20 is provided with an installation region of a jack 80, one end of the jack 80 abuts against the inner side wall of the auxiliary connecting body 20, and the other end abuts against a loading support 14 arranged at the center position of the end part of the main connecting body 10 to apply prestress. A displacement gauge 70 for connecting the sub-connecting body 20 and the main connecting body 10 is provided beside the jack 80.

The bottom of the frame of the auxiliary connecting body 20 is provided with a bottom plate 23, the area of the surface mounting main connecting body 10 is provided with a detachable cover plate 29, the detachable cover plate 29 is fixed on the frame of the auxiliary connecting body 20 through a fixing bolt 28, the area of the mounting jack 8 is provided with a cover plate 27 provided with a rotating shaft 26, and the dismounting jack 80 of the cover plate 27 can be conveniently opened. In order to facilitate the opening of the cover plate 27, a handle is provided on the outer surface of the cover plate 27.

The main connecting body 10 and the auxiliary connecting body 20 are respectively provided with a plurality of first connecting bolt holes 11 and second connecting bolt holes 24 on the outer connecting structure surface.

In the construction process, when the device is in an initial state, the return nut 41 is screwed, the stop bolt 60 is unscrewed, and the end sliding tooth plate 40 and the middle sliding tooth plate 30 which are meshed with the locking structure are in a separated state. Firstly, bolts are adopted to connect and fix the device and the part needing to be installed at the supporting node of the foundation pit enclosure structure through the first connecting bolt hole 11 of the main connecting body 10 and the second connecting bolt hole 24 of the auxiliary connecting body 20. The cover 27 is then opened and the jack 80 is installed and the displacement gauge 70 is brought into position. The jack 80 applies prestress to control reasonable loading rate, the displacement meter 70 can control the axial force monitoring result reaching the expected stroke or combined with steel support to stop loading, the two return nuts 41 are loosened to the top end, the stop bolt 60 is tightened at the same time, the end sliding toothed plate 40 and the middle sliding toothed plate 30 are in an engaged state, and the relative position of the main connecting body 10 and the auxiliary connecting body 20 is locked. And finally, gradually unloading the jack 80, taking out the jack 80 after the pressure reduction and unloading are finished, closing the cover plate 27, finishing the prestress application work of the support node at the position, and continuously performing the same step operation on other nodes needing prestress application on the enclosure structure.

The foundation pit supporting is completed, when the device needs to be dismantled, the cover plate 27 can be opened firstly, the jack 80 is installed, reasonable stress is applied through the jack 80, the main connecting body 10 is propped under the control of the displacement 70, the stop bolt 60 is loosened, and the return nut 41 is tightened until the end sliding toothed plate 40 and the middle sliding toothed plate 30 are separated. The jack 80 is then slowly unloaded and removed, and the cover 27 is closed. Finally, the bolts at the first connecting bolt holes 11 on the main connecting body 10 and the second connecting bolt holes 24 on the auxiliary connecting body 20 are removed, and the device is completed.

It is further understood that, unless otherwise expressly stated or limited, the terms "connected," "secured," "disposed," "provided," "mounted," and the like are to be construed broadly and to provide those skilled in the art with the understanding that they may be referred to more specifically in the context of their work.

The above embodiments are merely illustrative of the preferred embodiments of the present invention, and not restrictive, and various changes and modifications to the technical solutions of the present invention may be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are intended to fall within the scope of the present invention defined by the appended claims.