Device for prepressing counter-force frame of hanging basket steel sling in cantilever beam construction

Abstract

The invention relates to the technical field of hanging basket suspended pouring construction, in particular to a suspended pouring beam construction hanging basket steel sling counter-force frame pre-pressing device which comprises two hanging basket top cross beams arranged in parallel in a spaced mode, two spiral steel pipes are arranged between the two hanging basket top cross beams, a jack is arranged between the two spiral steel pipes, and the jack is connected with the hanging basket top cross beams. And the steel sling is connected with the hanging basket top cross beam. The method has the advantages that the cost is low, operation is convenient, safety is guaranteed, the construction period is shortened, the elastic deformation value and the non-elastic deformation value of the steel sling can be rapidly obtained, and the elevation of the bottom formwork is readjusted to the design position according to comparative analysis of pre-pressing observation data and structural theoretical calculation data.

Description

Technical Field

[0001] The invention relates to the technical field of hanging basket suspended pouring construction, in particular to a device for pre-pressing a steel sling reaction frame of a hanging basket for suspended pouring beam construction. Background Art

[0002] In current bridge construction, there are many large-span variable-section continuous box girders. The upper structure of this type of bridge is generally constructed using the hanging basket suspended casting method. The key to the hanging basket suspended casting method is the hanging basket. The preloading of the hanging basket is an indispensable construction step. The purpose of the hanging basket preloading is mainly to verify the reliability of the hanging basket and eliminate its inelastic deformation, while measuring the actual deformation value of the hanging basket under different loads in order to correct the formwork elevation.

[0003] At present, the method of preloading the hanging basket mainly adopts direct loading methods such as sandbags or water bags. This method is time-consuming, expensive, and difficult to simulate the actual working state of the hanging basket. In addition, due to the limited working space of the hanging basket and the limited loading quantity, it is often difficult to adapt to the preloading construction needs of the hanging basket of large-span variable-section continuous box girders. Summary of the invention

[0004] The purpose of the present invention is to provide a device for pre-stressing the reaction frame of the steel sling of a hanging basket for cantilevered beam construction based on the above-mentioned deficiencies of the prior art. By setting up the top crossbeam of the hanging basket and cooperating with the top pressure of the jack, the force of the jack is transmitted to the steel sling and the matching pin seat and connecting pin shaft to achieve the detection purpose.

[0005] The purpose of the present invention is achieved by the following technical solutions: A device for pre-stressing a steel sling reaction frame of a hanging basket for cantilevered beam construction, characterized in that it includes two hanging basket top cross beams arranged in parallel and at intervals, two sections of spiral steel pipes are arranged between the two hanging basket top cross beams, a jack is arranged between the two sections of the spiral steel pipes, and the steel sling is connected to the hanging basket top cross beam.

[0006] Two steel slings are arranged between the two top cross beams of the hanging basket, the outer ends of the two steel slings are respectively connected to the two top cross beams of the hanging basket, and the inner ends of the two steel slings are connected.

[0007] Connecting steel plates are respectively arranged on both sides of the inner ends of the two steel slings and are connected by connecting pins.

[0008] The connecting pin shaft is provided with a limiting ring.

[0009] The outer end of the steel sling is connected to the top cross beam of the hanging basket through a pin seat.

[0010] The advantages of the present invention are: low cost, easy operation, safety guarantee and time saving, and the elastic deformation and inelastic deformation values ​​of the steel sling can be quickly obtained, and the bottom mold elevation can be readjusted to the designed position based on the comparative analysis of the preloading observation data and the structural theoretical calculation data. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is the installation diagram of the present invention; Figure 2 It is a schematic diagram of the connection of the steel sling in the present invention. Implementation

[0012] The features of the present invention and other related features are further described in detail below through embodiments in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art: like Figure 1-2 As shown, the marks 1-8 in the figure respectively represent: spiral steel pipe 1, jack 2, steel sling 3, basket top beam 4, connecting pin 5, connecting steel plate 6, limit ring 7, pin seat 8.

[0013] Example: Figure 1-2 As shown, the device for pre-stressing the reaction frame of the steel sling of the hanging basket for cantilever beam construction in this embodiment is used to perform a pre-stressing test on the steel sling 3 used in the hanging basket construction and the matching connecting pin shaft 5 and pin seat to detect them.

[0014] Specifically, combined Figure 1 and Figure 2 As shown, the device includes two hanging basket top cross beams 4, which are parallel and spaced at a certain distance. Two sections of spiral steel pipes 1 perpendicular to the two hanging basket top cross beams 4 are arranged in the middle of the two hanging basket top cross beams 4. The two sections of spiral steel pipes 1 serve as force transmission components, and a jack 2 is arranged between the two sections of spiral steel pipes 1, which is used to provide loading.

[0015] Combination Figure 1 and Figure 2 As shown, the outer ends of the two steel slings 3 to be tested are respectively connected and fixed to a basket top cross beam 4 through a pin seat 8, and the inner ends of the two steel slings 3 are fixedly connected to form an integral structure through a connecting pin shaft 5 and a connecting steel plate 6. A limit ring 7 is also provided at the connecting pin shaft 5 for locking the connecting pin shaft 5.

[0016] When applied, this embodiment includes the following process: (1) Preload: Select the largest cantilever section and consider the influence of the basket formwork, bottom basket, suspension system and other loads during the construction process to calculate the test load value of a single steel sling.

[0017] (2) Steel sling (pin holder 8, connecting pin shaft 5) pre-stressing method: Arrange two basket top cross beams 4 symmetrically on the test site, select a shorter steel sling 3 to connect the two basket top cross beams 4 through the pin holder 8, and use an 80-ton through-hole jack 2 to press the basket top cross beam 4 on the inner side of the two pin holders 8. The force of the jack 2 is transmitted to the pin holder 8, connecting pin shaft 5 and steel sling 3 through the basket top cross beam 4, so as to achieve the purpose of testing the pin holder 8, connecting pin shaft 5 and steel sling 3.

[0018] (3) Deformation measurement: The preload measuring point of the steel sling 3 is set at the connection between the two basket top beams 4 and the steel sling 3. A steel ruler is used to measure the change in the spacing H2 / H2´ between the two sets of basket top beams. The measurement is performed once at the initial stage and each time the load is added or subtracted. The processing quality of the pin seat and the connecting pin shaft 5 (hole) is checked and recorded in detail.

[0019] (4) Based on the comparative analysis of the preloading observation data and the structural theoretical calculation data, readjust the bottom formwork elevation to the designed position.

[0020] Although the above embodiments have described in detail the concepts and embodiments of the present invention with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and changes can still be made to the present invention without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A device for preloading a steel sling reaction frame for a suspended beam construction hanging basket, characterized in that: It comprises two top cross beams of the hanging basket which are arranged in parallel and at intervals, two sections of spiral steel pipes are arranged between the two top cross beams of the hanging basket, a jack is arranged between the two sections of the spiral steel pipes, and the steel sling is connected to the top cross beam of the hanging basket.

2. The device for preloading a steel sling reaction frame for a cantilever beam construction hanging basket according to claim 1 is characterized in that: Two steel slings are arranged between the two top cross beams of the hanging basket, the outer ends of the two steel slings are respectively connected to the two top cross beams of the hanging basket, and the inner ends of the two steel slings are connected.

3. The device for preloading a steel sling reaction frame for a cantilever beam construction hanging basket according to claim 2 is characterized in that: Connecting steel plates are respectively arranged on both sides of the inner ends of the two steel slings and are connected by connecting pins.

4. The device for preloading a steel sling reaction frame for a cantilever beam construction hanging basket according to claim 3 is characterized in that: The connecting pin shaft is provided with a limiting ring.

5. The device for preloading a steel sling reaction frame for a cantilever beam construction hanging basket according to claim 2 is characterized in that: The outer end of the steel sling is connected to the top cross beam of the hanging basket through a pin seat.

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