A kind of cast-in-place beam support loading preloading device

Abstract

The utility model belongs to the technical field of bridge construction, and provides a loading and preloading device for a cast-in-place beam support, including: a base plate, a top plate and a counterweight seat, the base plate is centrally arranged above the casting template; the top plate is horizontally placed directly above the base plate, both ends of the top plate extend to the outside of the casting template, a center plate protrudes from the middle of the lower surface of the top plate, and a plurality of jacks are vertically arranged between the center plate and the base plate. Although the utility model still needs to rely on the gravity of the piled material to complete the loading and preloading, it does not need to hoist the piled material above the casting template, but starts to pile it on the surface as a counterweight, which does not generate the risk of falling from a high altitude, greatly reducing the potential safety hazards. At the same time, the utility model does not need to use lifting equipment and the assistance of staff when loading the load of the casting template, which greatly reduces the labor intensity of the staff, effectively improves the work efficiency, and shortens the bridge construction period.

Description

Technical Field

[0001] The utility model belongs to the technical field of bridge construction, and in particular relates to a cast-in-place beam support loading and preloading device. Background Art

[0002] Before pouring the beam on site, it is necessary to set up a scaffold to support the pouring formwork and pre-load the erected scaffold with equal load or overload. The purpose of pre-loading is to test the strength, stiffness and stability of the scaffold, and to eliminate the non-elastic deformation of the scaffold after loading and to measure the elastic deformation value of the scaffold.

[0003] At present, the traditional support preloading is generally carried out by stacking preloading. Common stacking materials include concrete blocks, sandbags or steel. Since the support preloading must be carried out in a graded loading manner, it is necessary to lift the stacking materials frequently and multiple times with lifting equipment to achieve the purpose of gradually strengthening the preloading load. At the same time, it is also necessary for the staff above and below the casting formwork to frequently assist in the lifting. This method has a long construction period, high labor intensity, low work efficiency, and frequent lifting of stacking materials poses a safety hazard of falling from high altitude.

[0004] Therefore, it is necessary to provide an improved technical solution to address the above-mentioned deficiencies in the prior art. Utility Model Content

[0005] The purpose of the utility model is to overcome the problems of long construction period, high labor intensity, low work efficiency and potential safety hazards in the bracket preloading method in the above-mentioned prior art, and to provide a cast-in-place beam bracket loading preloading device.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A loading and prestressing device for a cast-in-place beam support comprises: a base plate, a top plate and a counterweight seat, wherein the base plate is centrally arranged above a casting formwork; the top plate is horizontally placed directly above the base plate, both ends of the top plate extend to the outside of the casting formwork, a center plate protrudes from the middle of the lower surface of the top plate, a plurality of jacks are vertically arranged between the center plate and the base plate, the upper ends of the jacks are in contact with the lower plate surface of the center plate, and the lower ends of the jacks are in contact with the upper plate surface of the base plate; the counterweight seat is arranged on the ground below the end of the top plate, a steel strand is stretched between the middle of the counterweight seat and the end of the top plate, and the steel strand is kept in a vertical state.

[0008] In the above-mentioned cast-in-place beam support loading preloading device, preferably, both sides of the lower plate surface of the center plate are provided with alignment core rods;

[0009] Both sides of the upper plate surface of the base plate are provided with alignment sleeves corresponding to the alignment core rods;

[0010] The alignment core rod is inserted into the corresponding alignment sleeve.

[0011] Preferably, a plurality of positioning grooves that fit with the bottom of the jack are evenly distributed on the upper plate surface of the base plate so that the jack can be placed in the positioning grooves.

[0012] Preferably, both ends of the steel strand are provided with a conical cable tie made of rubber;

[0013] The ends of the steel strands are dispersed into a plurality of steel wires which penetrate the tip of the conical cable bundle and protrude outwards.

[0014] Preferably, the portion of the steel wire of the steel strand protruding from the conical cable bundle is thickened.

[0015] Preferably, both ends of the top plate and the middle of the counterweight seat are provided with limiting holes adapted to the conical cable harness;

[0016] The conical cable guide is located inside the limiting channel.

[0017] Preferably, a lifting block is provided at the bottom of the counterweight seat.

[0018] Beneficial effects: Although the utility model still needs to rely on the gravity of the piled material to complete the loading pre-compression, there is no need to hoist the piled material above the casting formwork. Instead, the piled material is started on the ground as a counterweight, which does not create the risk of falling from heights and greatly reduces safety hazards. At the same time, the utility model no longer needs to use lifting equipment and the assistance of staff when loading the load of the casting formwork, which greatly reduces the labor intensity of the staff, effectively improves work efficiency, and shortens the bridge construction period. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings constituting part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation on the present invention. Among them:

[0020] Figure 1 It is a main schematic diagram of the practical application of the utility model;

[0021] Figure 2 for Figure 1 The enlarged schematic diagram at A in the middle;

[0022] Figure 3 It is a cross-sectional schematic diagram of the conical beamer of the utility model.

[0023] In the figure: 1. Base plate; 2. Top plate; 3. Center plate; 4. Jack; 5. Counterweight seat; 6. Steel strand; 7. Positioning core rod; 8. Positioning sleeve; 9. Conical cable guide; 10. Limiting hole; 11. Lifting block; 12. Half pipe. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field belong to the protection scope of the present invention.

[0025] In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and do not require that the present invention must be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. The terms "connected" and "connection" used in the present invention should be understood in a broad sense. For example, they can be fixed connections or detachable connections; they can be directly connected or indirectly connected through intermediate components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0026] The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0027] Embodiment: This embodiment aims to provide a cast-in-place beam support loading and prestressing device, the main function of which is to greatly reduce safety hazards, reduce labor intensity, effectively improve work efficiency, and shorten the bridge construction period.

[0028] Reference Figure 1, including: a base plate 1, a top plate 2 and a counterweight seat 5. The base plate 1 is centrally arranged above the casting template. A plurality of positioning grooves that match the bottom of the jack 4 are evenly distributed on the upper surface of the base plate 1. The positioning groove is formed by a small section of a half-tube 12 welded on the upper surface of the base plate 1. As long as it can play a positioning role for the bottom of the jack 4, a corresponding number of jacks 4 are placed in the positioning grooves, and calibration sleeves 8 are welded and fixed on both sides of the upper plate surface of the base plate 1; the top plate 2 is horizontally placed directly above the base plate 1, and the left and right ends of the top plate 2 extend in their respective corresponding directions until the outside of the casting template. A center plate 3 protrudes from the middle of the lower surface of the top plate 2. The center plate 3 is provided to better contact with the jack 4, that is, the upper end of the jack 4 contacts the lower plate surface of the center plate 3, and the lower end of the jack 4 contacts the upper plate surface of the base plate 1.

[0029] Both sides of the lower plate surface of the center plate 3 are provided with alignment core rods 7 corresponding to the alignment sleeves 8, so that the alignment core rods 7 can be inserted into the corresponding alignment sleeves 8 to quickly position the top plate 2 and the base plate 1, while also ensuring the stability of the top plate 2 when subjected to force.

[0030] Reference Figure 1 , Figure 2 and Figure 3 A counterweight seat 5 is placed on the ground below the left and right ends of the top plate 2. The top of the counterweight seat 5 can carry sandbags, concrete blocks, steel, etc., and lifting blocks 11 are fixed on both sides of the bottom of the counterweight seat 5 to transfer the counterweight seat 5. A steel strand 6 is stretched between the middle of the counterweight seat 5 and the end of the top plate 2 to keep the steel strand 6 in a vertical state. Specifically, a rubber conical cable tie 9 is provided at both ends of the steel strand 6 to disperse the end of the steel strand 6 into multiple steel wires from The tip of the conical cable harness 9 starts to penetrate it and protrude outward, and the outside of the protruding part of the steel wire is welded and thickened to prevent the conical cable harness 9 from slipping; both ends of the top plate 2 and the middle of the counterweight seat 5 are provided with limiting holes 10 compatible with the conical cable harness 9, the pointed hole of the limiting hole 10 located at the top faces downward and the coarse hole faces upward, and the pointed hole of the limiting hole 10 located at the bottom faces upward and the coarse hole exceeds downward, so that the conical cable harnesses 9 at both ends of the steel strand 6 can be placed inside the corresponding limiting holes 10.

[0031] In actual operation, the jack 4 is controlled to generate a thrust on the center plate 3. Under the cooperation of the counterweight seat 5 and the steel strand 6, the thrust on the center plate 3 will be transmitted to the base plate 1 through the jack 4, and then transmitted to the bracket under the casting formwork through the base plate 1. Then the output force of the jack 4 is gradually increased. At the same time, the staff can judge whether it is necessary to add weight to the counterweight seat 5 to test the strength, rigidity and stability of the bracket, eliminate the inelastic deformation of the bracket after pre-loading, and measure the elastic deformation value of the bracket.

[0032] Although the gravity of the loading material is still needed to complete the loading preloading in this embodiment, the loading material does not need to be hoisted above the casting formwork. Instead, the loading is started on the surface and used as a counterweight, which does not create the risk of falling from a high altitude and greatly reduces safety hazards. At the same time, in this embodiment, when loading the load of the casting formwork, there is no need to use lifting equipment and the assistance of staff, which greatly reduces the labor intensity of the staff, effectively improves work efficiency, and shortens the bridge construction period.

[0033] It should be understood that the above description is merely exemplary and the embodiments of the present application do not limit this.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A cast-in-place beam support loading and preloading device, characterized in that: include: The foundation plate is centrally located above the casting formwork; A top plate is horizontally placed directly above the base plate, both ends of the top plate extend to the outside of the casting formwork, a center plate protrudes from the middle of the lower surface of the top plate, a plurality of jacks are vertically arranged between the center plate and the base plate, the upper ends of the jacks are in contact with the lower plate surface of the center plate, and the lower ends of the jacks are in contact with the upper plate surface of the base plate; The counterweight seat is arranged on the ground surface below the end of the top plate. A steel strand is stretched between the middle of the counterweight seat and the end of the top plate, and the steel strand is kept in a vertical state.

2. The cast-in-place beam support loading and preloading device according to claim 1 is characterized in that: Both sides of the lower plate surface of the center plate are provided with alignment core rods; Both sides of the upper plate surface of the base plate are provided with alignment sleeves corresponding to the alignment core rods; The alignment core rod is inserted into the corresponding alignment sleeve.

3. The cast-in-place beam support loading and preloading device according to claim 1 is characterized in that: The upper plate surface of the base plate is evenly distributed with a plurality of positioning grooves that match the bottom of the jack so that the jack can be placed in the positioning grooves.

4. The cast-in-place beam support loading and preloading device according to claim 1, characterized in that: Both ends of the steel strand are provided with a conical cable tie made of rubber; The ends of the steel strands are dispersed into a plurality of steel wires which penetrate the tip of the conical cable bundle and protrude outwards.

5. The cast-in-place beam support loading and preloading device according to claim 4 is characterized in that: The portion of the steel wire of the steel strand protruding from the conical cable bundle is thickened.

6. The cast-in-place beam support loading preloading device according to claim 4, characterized in that: Both ends of the top plate and the middle of the counterweight seat are provided with limiting holes adapted to the conical cable harness; The conical cable guide is located inside the limiting channel.

7. The cast-in-place beam support loading and preloading device according to claim 1 is characterized in that: A lifting block is arranged at the bottom of the counterweight seat.

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