CN215104588U - Flat-open type foundation pit trestle structure - Google Patents

Abstract

The utility model discloses a side-hung foundation pit trestle structure, which comprises at least one trestle unit; the trestle unit comprises a reinforced concrete main beam, trestle columns, a steel secondary beam, an assembled prefabricated trestle plate and a hydraulic jack; one end of the hydraulic jack is connected with the reinforced concrete girder, and the other end of the hydraulic jack is connected with the prefabricated trestle plate. The utility model has the advantages that: the waterproof performance of the basement structure is improved; the hydraulic jack is arranged to control the opening of the prefabricated trestle plate, so that the construction area clearance can be increased, the problem of conflict between the design and positioning of the steel column and the trestle plate is solved, and the construction period is greatly shortened; not only ensures the structural rigidity, but also can effectively control the structural deformation and bring convenience to the construction.

Description

Flat-open type foundation pit trestle structure

Technical Field

The utility model relates to a construction technical field specifically indicates a flat-open type foundation ditch landing stage structure.

Background

Along with the increasing of the urban density, the construction site of foundation pit engineering is also continuously reduced. Under the condition that the operation space of a foundation pit is narrow, a construction site is generally expanded by arranging a trestle on the foundation pit. The common trestle structure in the engineering at present has steel construction trestle and reinforced concrete trestle.

The steel structure trestle structure can be divided into a profile steel truss system and a net rack trestle system. The structural steel truss system has wide domestic application, beautiful and elegant appearance, simple and convenient construction, safety and reliability. But the section steel trestle belongs to a plane stress system, and has low steel utilization rate, large steel consumption and complex connection. Meanwhile, the design of the section steel truss node is complicated, the node form is complex, paint brushing or dust removing dead corners are difficult, and maintenance is not facilitated. The net rack trestle system adopts steel pipes or the combination of the steel pipes and other section steel, and the nodes adopt welded hollow ball nodes or bolt ball nodes. Compared with a structural steel trestle, the steel pipe is adopted as the main component of the net rack trestle, so that the dead weight is reduced, and the anti-seismic performance is good. Meanwhile, the nodes and the rod pieces can be processed and manufactured by professional manufacturers, so that the manufacturing quality is ensured, and the construction period is shortened. However, when the span of the structure is large to a certain extent, the structural rigidity of the structure is reduced and the displacement of the foundation pit is increased, so that the integral buckling or resonance phenomenon is generated, and the deformation control requirement of the surrounding complex environment on the foundation pit cannot be met.

The reinforced concrete landing stage is that reinforced concrete supports combines the reinforced concrete landing stage, and the landing stage board is for monolithic concreting with the landing stage board, and the landing stage board is whole can not dismantle. When a steel structure is arranged on the ground of a high-rise building and a basement is deep, a bridge plate needs to be adopted, and a steel column is generally inserted below two floors. At the moment, if the design and positioning of the steel column just conflicts with the trestle plate, and the trestle plate is not detached when the steel column needs to be constructed, a hole is formed in the trestle plate in advance or the steel column is hoisted to the trestle plate edge by using a tower crane, and then mechanical horizontal transportation is adopted to be carried to the lower part of the trestle plate. Therefore, the construction workload is increased, and the construction period progress is delayed. And when the trestle is tightly attached to the upper side of the basement roof, the integrally cast trestle plate can obstruct the reinforcement and concrete casting construction of the basement roof below the area, so that the structural roof cannot be integrally cast to form a construction joint, and the main structure is influenced to be waterproof.

In addition, because the load that the landing stage region receives is great, in order to guarantee the atress reliability of landing stage system, generally, shelve the landing stage board and put in landing stage roof beam top, lead to the gross thickness of landing stage roof beam board system great. In summary, it is urgent to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the problems that the existing steel structure trestle can not be suitable for a large-span foundation pit, the reinforced concrete trestle occupies large space and is difficult to construct and dismantle, and provides a side-hung foundation pit trestle structure which comprises at least one trestle unit; the trestle unit comprises a reinforced concrete main beam, trestle columns, a steel secondary beam, an assembled prefabricated trestle plate and a hydraulic jack; the reinforced concrete main beam is arranged at the upper end of the trestle column; the steel secondary beam is arranged on one side of the reinforced concrete main beam; one end of the assembly type prefabricated trestle plate is connected with the steel secondary beam, and the other end of the assembly type prefabricated trestle plate is hinged with the reinforced concrete main beam; one end of the hydraulic jack is connected with the reinforced concrete girder, and the other end of the hydraulic jack is connected with the prefabricated trestle plate.

Furthermore, a plurality of connecting pore channels are arranged at intervals along the length direction of the reinforced concrete main beam.

Further, the trestle unit also comprises a shear brace; one end of the shear support is connected with the connecting hole on the reinforced concrete main beam, and the other end of the shear support is connected with the secondary steel beam.

Furthermore, a movable hinge ring is arranged on the connecting pore channel; the movable hinged ring is connected with the prefabricated trestle plate of the assembly type.

Furthermore, a plastic groove is formed in the assembly type prefabricated trestle plate; one end of the hydraulic jack is provided with a connecting steel plate; the connecting steel plate is arranged in the plastic groove and connected through a bolt. Through the effect of the plastic groove, the hydraulic jack is stably connected with the prefabricated trestle plate and the stress reliability is ensured.

Further, a waterproof layer is arranged in the plastic groove.

Further, a plain concrete layer is filled in the plastic groove.

Further, the secondary steel beams and the main reinforced concrete beam are arranged in parallel at intervals; the foundation pit trestle structure comprises at least one trestle module; the trestle module comprises two trestle units which are symmetrically arranged by taking the steel secondary beam as a symmetrical plane.

Further, the foundation pit trestle structure comprises a plurality of trestle modules arranged along the length direction of the reinforced concrete girder.

The utility model has the advantages that:

1. the prefabricated trestle board of assembled replaces the traditional integral pouring method, can be repeatedly used for many times, improves the effective utilization rate of materials, and has the advantages of environmental protection, material saving, cost saving and the like.

2. The problem of wholly pour trestle plate hinder the reinforcement and the concrete placement construction of the basement structure roof of below is solved, make the structure roof construction joint of pouring more simple and convenient, improved basement structure's waterproof performance.

3. The defects that the existing reinforced concrete trestle occupies a large space, is difficult to remove after being formed at one time, and needs to hoist a steel column to influence the construction progress are overcome; the opening of the prefabricated landing stage slab of assembled of hydraulic jack control through setting up, multiplicable construction area headroom solves the problem of steel column design location and landing stage slab conflict, has shortened construction cycle greatly.

4. The form of steel-concrete combination is adopted, so that the structural rigidity is ensured, the structural deformation can be effectively controlled, and convenience is brought to construction.

Drawings

Fig. 1 is the utility model discloses side-hung type foundation ditch landing stage structure's main structure sketch map of looking.

Fig. 2 is a schematic bottom view of fig. 1.

Fig. 3 is a left side view of the structure of fig. 1.

Fig. 4 is a schematic structural view of the assembled prefabricated stacked bridge plate in fig. 3 after being opened.

In the figure; the method comprises the following steps of 1-reinforced concrete main beam, 2-trestle column, 3-steel secondary beam, 4-cross brace, 5-fabricated bridge plank, 6-hydraulic jack, 7-movable hinge ring, 8-plastic groove, 9-bolt and 10-connecting steel plate.

Detailed Description

The invention is described in further detail below with reference to the figures and the specific embodiments.

Fig. 3 and 4 are schematic structural diagrams of closing and opening of an assembled prefabricated trestle plate of the side-hung foundation pit trestle structure according to the embodiment, respectively, wherein the structures of the shear brace, the movable hinge ring 7 and the like in fig. 2 are not shown in the figure.

Fig. 1 to 4 show a side-hung foundation pit trestle structure, which includes a plurality of trestle modules arranged along the length direction of a reinforced concrete main beam 1, and fig. 2 in this embodiment only shows one complete trestle module. The complete trestle module comprises two trestle units which are symmetrically arranged by taking the steel secondary beam 3 as a symmetrical plane. Referring to fig. 4, the prefabricated assembled trestle plates 5 of two trestle units on the same trestle module are both opened. Two landing stage units that the symmetry set up can share same steel secondary beam 3, and steel secondary beam 3 is telescopic steel secondary beam 3 in this embodiment.

Specifically, the trestle unit comprises a reinforced concrete main beam 1, trestle columns 2, a steel secondary beam 3, an assembled prefabricated trestle plate 5, a hydraulic jack 6 and a shear support; the reinforced concrete girder 1 is arranged at the upper end of the trestle column 2; the secondary steel beam 3 is arranged on one side of the reinforced concrete main beam 1, and the secondary steel beam 3 and the reinforced concrete main beam 1 are parallel and arranged at intervals; one end of the assembly type prefabricated stacked bridge plate 5 is connected with the steel secondary beam 3, and the other end of the assembly type prefabricated stacked bridge plate 5 is hinged with the reinforced concrete main beam 1; one end of a hydraulic jack 6 is connected with the reinforced concrete main beam 1, and the other end of the hydraulic jack 6 is connected with the prefabricated stacked bridge plate 5.

The reinforced concrete main beam 1 is provided with a plurality of connecting pore canals along the length direction at intervals. One end of the shear support is connected with a connecting pore channel on the reinforced concrete main beam 1, and the other end of the shear support is connected with the steel secondary beam 3. The connecting pore passage is also provided with a movable hinge ring 7; the movable hinge ring 7 is connected with the prefabricated assembled trestle plate 5. And after one end of the shear support on the connecting hole and the movable hinge ring 7 are installed, sealing the slurry on the connecting hole.

In order to improve the structural stability, a plastic groove 8 is arranged on the assembly type prefabricated trestle plate 5; one end of the hydraulic jack 6 is provided with a connecting steel plate 10; the connecting steel plates 10 are arranged in the plastic grooves 8 and connected through bolts 9. A waterproof layer is arranged in the plastic groove 8 and is filled with a plain concrete layer. The end face of the plain concrete layer is flush with the end face of the prefabricated stacked bridge plate 5.

The construction method of the foundation pit trestle structure comprises the following steps:

the method comprises the following steps of firstly, surveying a foundation pit site before construction, determining proper plane arrangement of foundation pit construction so as to design the number of trestle modules and the size of a corresponding prefabricated trestle plate in each trestle module, and selecting an optimal installation position by combining a support arrangement form of the foundation pit.

And step two, cleaning and leveling a construction site, excavating a foundation pit at a construction position, erecting a template in the foundation pit, constructing a foundation pit trestle column 2 and a reinforced concrete main beam 1, reserving a connecting pore channel on the reinforced concrete main beam 1, and then uniformly pouring a horizontal support of the foundation pit and installing a cross brace 4.

Thirdly, erecting a telescopic secondary steel beam 3 beside the main reinforced concrete beam 1, wherein the elevation and the relative horizontal position of the main reinforced concrete beam 1 and the secondary steel beam 3 need to be measured during erection, and the error is controlled within +/-5 mm; for example, in this embodiment, the height difference between the upper end surface of the secondary steel beam 3 and the upper end surface of the main reinforced concrete beam 1 is equal to the thickness of the prefabricated stacked bridge plate 5.

And fourthly, mounting a hydraulic jack 6 and a movable hinge ring 7 on the reinforced concrete main beam 1, wherein the movable hinge ring 7 is inserted into a reserved connecting hole channel of the reinforced concrete main beam 1, and sealing the slurry.

And fifthly, hoisting and erecting the prefabricated stacked bridge plate 5, integrally positioning, hinging with the reinforced concrete main beam 1, namely connecting the reinforced concrete main beam 1 with the movable hinging ring 7, and then performing local accurate positioning after connection is completed, so that the other side of the prefabricated stacked bridge plate 5 is fixedly connected with the steel secondary beam 3.

And step six, inserting the connecting steel plate 10 at one end of the hydraulic jack 6 into the reserved plastic groove 8 of the prefabricated stacked bridge plate 5, and fixing the connecting steel plate by using the bolt 9.

And step seven, paving a layer of waterproof material in the plastic groove 8 to form a waterproof layer, and filling and floating the waterproof layer with C15 plain concrete to form a plain concrete layer.

It is above only the utility model discloses a preferred embodiment, the utility model discloses a scope of protection does not only confine above-mentioned embodiment, the all belongs to the utility model discloses a technical scheme under the thinking all belongs to the utility model discloses a scope of protection. It should be noted that a person skilled in the art should also recognize that several modifications and decorations can be made without departing from the principle of the present invention, and the protection scope of the present invention is also covered.

Claims (9)

1. The utility model provides a flat-open foundation ditch landing stage structure which characterized in that: comprises at least one trestle unit; the trestle unit comprises a reinforced concrete main beam, trestle columns, a steel secondary beam, an assembled prefabricated trestle plate and a hydraulic jack; the reinforced concrete main beam is arranged at the upper end of the trestle column; the steel secondary beam is arranged on one side of the reinforced concrete main beam; one end of the assembly type prefabricated trestle plate is connected with the steel secondary beam, and the other end of the assembly type prefabricated trestle plate is hinged with the reinforced concrete main beam; one end of the hydraulic jack is connected with the reinforced concrete girder, and the other end of the hydraulic jack is connected with the prefabricated trestle plate.

2. The side-hung foundation pit trestle structure according to claim 1, characterized in that: the reinforced concrete main beam is provided with a plurality of connecting pore channels at intervals along the length direction.

3. The side-hung foundation pit trestle structure according to claim 2, characterized in that: the trestle unit also comprises a shear support; one end of the shear support is connected with the connecting hole on the reinforced concrete main beam, and the other end of the shear support is connected with the secondary steel beam.

4. The side-hung foundation pit trestle structure according to claim 2, characterized in that: the connecting pore passage is provided with a movable hinge ring; the movable hinged ring is connected with the prefabricated trestle plate of the assembly type.

5. The side-hung foundation pit trestle structure according to claim 1, characterized in that: a plastic groove is formed in the assembled prefabricated trestle plate; one end of the hydraulic jack is provided with a connecting steel plate; the connecting steel plate is arranged in the plastic groove and connected through a bolt.

6. The side-hung foundation pit trestle structure according to claim 5, characterized in that: and a waterproof layer is arranged in the plastic groove.

7. The side-hung foundation pit trestle structure according to claim 5 or 6, characterized in that: and a plain concrete layer is filled in the plastic groove.

8. The side-hung foundation pit trestle structure according to claim 1, characterized in that: the steel secondary beams and the reinforced concrete main beams are parallel and arranged at intervals; the foundation pit trestle structure comprises at least one trestle module; the trestle module comprises two trestle units which are symmetrically arranged by taking the steel secondary beam as a symmetrical plane.

9. The side-hung foundation pit trestle structure according to claim 8, characterized in that: the foundation pit trestle structure comprises a plurality of trestle modules arranged along the length direction of the reinforced concrete girder.

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