Diamond-shaped hanging basket main truss counter-force pre-pressing system

Abstract

The invention relates to a diamond-shaped hanging basket main truss counter-force pre-pressing system which is formed by symmetrically assembling two diamond-shaped hanging basket main trusses, each diamond-shaped hanging basket main truss is formed by splicing rod pieces, each rod piece comprises a lower horizontal rod, a stand column, a rear pull rod, an upper horizontal rod and a front inclined rod, and the lower horizontal rods, the rear pull rods, the upper horizontal rods and the front inclined rods are connected to form a diamond-shaped structure. The stand column is arranged between the lower flat rod and the upper flat rod. The upper flat rods of the two rhombic hanging basket main trusses are fixed in a penetrating manner through finish rolling deformed steel bars, and an oil jack is arranged at the end part of the finish rolling deformed steel bar of one rhombic hanging basket main truss; the lower flat rods of the two rhombic hanging basket main trusses are fixed in a penetrating mode through finish rolling deformed steel bars. The invention has the advantages that: the load can be uniformly transmitted; the size of the rhombic hanging basket main truss can be changed according to actual conditions, and the application range is expanded; the cost is low, and the economy is good; the pre-pressing material input of the hanging basket is low; the safety coefficient is high, the period is short, and construction period optimization is facilitated.

Description

Technical Field

[0001] The invention relates to the technical field of hanging basket suspended pouring construction, in particular to a rhombus hanging basket main truss reaction force preloading system. Background Art

[0002] In the traditional diamond-shaped hanging basket suspended casting construction, the hanging basket main truss is pre-stressed by installing the hanging basket and the formwork at the suspended casting segment bridge position, and then the graded loading pre-stressing is carried out. The loading is carried out by sandbags or precast concrete blocks. The sandbags or precast concrete blocks need to be hoisted to the hanging basket formwork by hoisting equipment for loading. The loading is distributed in a simulated segment load. After the graded loading pre-stressing is completed, the sandbags or precast concrete blocks are removed and unloaded by hoisting equipment, and the formwork is adjusted to start the suspended casting segment construction.

[0003] In the traditional diamond hanging basket main truss preloading method, sandbags or precast concrete blocks are used to simulate segment loads for preloading, which requires large material investment and high cost. Moreover, the loading and unloading process of sandbags or precast concrete blocks requires hoisting operations. The suspended cast segments are generally high in height, and the hoisting operation surface is small after the installation of the diamond hanging basket and formwork, and the safety risk of hoisting operations is high. The preloading of the main truss of the hanging basket requires tensioning and grouting to be completed on the 0# block, and the strength must meet the design requirements before the hanging basket can be installed. The cycle is long, which is not conducive to the optimization of the construction period.

[0004] The existing hanging basket preloading method has technical problems such as large material input, high cost, high safety risk of hoisting operation, long cycle, and is not conducive to construction period optimization. Summary of the invention

[0005] The purpose of the present invention is to provide a rhombus hanging basket main truss reaction prestressing system based on the above-mentioned deficiencies of the prior art, by symmetrically assembling two rhombus hanging basket main trusses composed of rods and boxes and fixing them through precision-rolled threaded steel and distribution beams, so as to achieve load prestressing on the main trusses.

[0006] The purpose of the present invention is achieved by the following technical solutions: A diamond hanging basket main truss reaction force preloading system, characterized in that: it is composed of two diamond hanging basket main trusses symmetrically assembled, wherein the diamond hanging basket main trusses are composed of rods assembled, and the rods include a lower horizontal rod, a column, a rear pull rod, an upper horizontal rod, and a front oblique rod, wherein the lower horizontal rod, the rear pull rod, the upper horizontal rod and the front oblique rod are connected to form a diamond structure, and the column is arranged between the lower horizontal rod and the upper horizontal rod; The upper horizontal bars of the two diamond-shaped hanging basket main trusses are fixed through the finely rolled threaded steel bars, and an oil cap is arranged at the end of the finely rolled threaded steel bars of one diamond-shaped hanging basket main truss; The lower horizontal rods of the two diamond-shaped hanging basket main trusses are fixed through precision-rolled threaded steel bars.

[0007] The lower horizontal rod and the rear pull rod are connected via a rear anchor box, the rear pull rod and the upper horizontal rod are connected via a rear upper box, the upper horizontal rod and the front oblique rod are connected via a front upper box, the front oblique rod and the lower horizontal rod are connected via a front support box, and the column is arranged between the front support box and the rear upper box.

[0008] Pad beams are respectively arranged between the front support boxes of the two rhombus-shaped main trusses and the rear anchor boxes therebetween.

[0009] The rear anchor box, the rear upper box, the front upper box and the front support box are pin-connected with their respective corresponding rods, and the rear anchor box, the rear upper box, the front upper box and the front support box are respectively provided with a plurality of pin-connecting holes for connecting with their respective corresponding rods.

[0010] Distribution beams are respectively arranged at the two ends of the finish-rolled threaded steel bar.

[0011] The ends of the finished rolled threaded steel bars between the upper flat bars are provided with vertical distribution beams and transverse distribution beams.

[0012] The advantages of the present invention are: ensuring the smooth progress of the preloading test, especially ensuring that the load can be evenly transmitted; easy assembly and the size of the diamond hanging basket main truss can be changed according to actual conditions to expand the scope of application; low cost and good economy; small investment in hanging basket preloading materials; high safety factor, short cycle, and conducive to construction period optimization. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the overall assembly of the present invention; Figure 2 It is a schematic diagram of the front end and rear end reinforcement in the present invention; Figure 3 for Figure 2 Detailed view of the reinforcement part A at the middle and front end; Figure 4 for Figure 2 Detail of reinforcement part B at the middle front end (oil top side); Figure 5 for Figure 2 Detail of the reinforcement part C at the middle and rear end. Implementation

[0014] 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 1-5As shown, marks 1-17 in the figure respectively represent: lower horizontal rod 1, column 2, rear pull rod 3, upper horizontal rod 4, front oblique rod 5, rear anchor box 6, front support box 7, rear upper box 8, front upper box 9, 1# distribution beam 10, gasket 11, reinforcement nut 12, 2# distribution beam 13, precision-rolled threaded steel 14, cushion beam 15, reinforcement pin 16, oil top 17.

[0015] Example: Figures 1 to 5 As shown, in this embodiment, two pieces of diamond-shaped hanging basket main trusses with the same structure are assembled. Each diamond-shaped hanging basket main truss is composed of a lower horizontal rod 1, a column 2, a rear tie rod 3, an upper horizontal rod 4, and a front oblique rod 5, which are assembled into a single complete diamond-shaped main truss through a reinforcing pin 16, a rear anchor box 6, a front support box 7, a rear upper box 8, and a front upper box 9.

[0016] Specifically, if Figure 1 As shown, the rear end of the lower horizontal rod 1 is connected to the rear anchor box 6, the rear anchor box 6 is connected to one end of the rear pull rod 3, the other end of the rear pull rod 3 is connected to the rear upper box 8, the rear upper box 8 is connected to the rear end of the upper horizontal rod 4, the front end of the upper horizontal rod is connected to the front upper box 9, the front upper box 9 is connected to one end of the front oblique rod 5, the other end of the front oblique rod 5 is connected to the front support box 7, the front support box 7 is connected to the front end of the lower horizontal rod 1, so as to form a closed-loop diamond structure. The column 2 is arranged between the rear upper box 8 and the front support box 7 to ensure the structural strength and stability of the diamond structure.

[0017] In this embodiment, the connection between each rod and each connecting box is achieved by pin connection through a reinforcing pin 16, so that the diamond-shaped hanging basket main truss in this embodiment is a unit prefabricated assembly structure, that is, the rods and connecting boxes are prefabricated as units, and can be quickly assembled on site for pre-stressing tests. Even if a rod or a connecting box is damaged, it can be quickly replaced, which is conducive to construction.

[0018] In addition, the diamond-shaped hanging basket main truss in this embodiment also has the characteristics of adjustable shape and size. Figure 1 As shown, a plurality of pin connection holes matching the structure of the reinforcing pin 16 are arranged on the rear anchor box 6, the front support box 7, the rear upper box 8, and the front upper box 9 respectively; taking the rear anchor box 6 and the front support box 7 respectively connected to the two ends of the lower horizontal rod 1 as an example, Figure 1 In the embodiment, the front end of the lower horizontal rod 1 is pinned to the pinning hole on the rear side of the front support box 7 through the reinforcing pin 16, but according to the actual situation, the front end of the lower horizontal rod 1 can be pinned to the current pinning hole ( Figure 1The front anchor box 7 is inserted into another pin connection hole on the front side of the upper horizontal rod 4 (shown), thereby shortening the distance between the front support box 7 and the rear anchor box 6, and further shortening the length of the side of the diamond-shaped hanging basket main truss. However, at the same time, the installation positions of the two ends of the upper horizontal rod 4 must be changed to maintain the diamond structure. Therefore, the size of the diamond hanging basket main truss in this embodiment can be changed according to actual engineering requirements. Similarly, by changing the pin connection position of the rear pull rod 3 and the front oblique rod 5, the inner angle of the diamond hanging basket main truss can be changed, thereby changing the shape of the diamond hanging basket main truss.

[0019] like Figure 1 As shown, two diamond-shaped hanging basket main trusses are placed symmetrically on the same horizontal plane, and cushion beams 15 are respectively arranged between the rear anchor box 6 and the front support box 7 of the main trusses. The cushion beams 15 are used to achieve uniform load transfer between the rear anchor box 6 and the front support box 7 of the two diamond-shaped hanging basket main trusses.

[0020] Combination Figure 2 and Figure 3 As shown, there are two reinforcements, front and rear, between the two diamond-shaped hanging basket main trusses. Six uniformly arranged finely rolled threaded steel bars 14 (divided into two rows, three in each row) are used to penetrate and fix between the rear anchor boxes 6 of the two diamond-shaped hanging basket main trusses, and two finely rolled threaded steel bars 14 (two rows, one in each row) are used to penetrate and fix the front end, wherein the front end is reinforced separately for the oil top side and the non-oil top side.

[0021] like Figure 3 As shown, the front end (non-oil top side) reinforcement of the diamond hanging basket main truss includes a vertically arranged 1# distribution beam 10, a horizontally arranged 2# distribution beam 13, a gasket 11, a nut 12 and a finely rolled threaded steel bar 14. Among them, the finely rolled threaded steel bar 14 is fixed on the 2# distribution beam 13 by installing the gasket 11 and the nut 12, and the 2# distribution beam 13 is in contact with the front upper box body 9 through the two configured 1# distribution beams 10.

[0022] like Figure 4 As shown, the front end (oil top side) reinforcement of the diamond hanging basket main truss includes 1# distribution beam 10, 2# distribution beam 13, precision-rolled threaded steel 14, and oil top 17, wherein the distribution beam 10 is vertically arranged, and the 2# distribution beam 13 is horizontally arranged, and the load is applied to the oil top at 60%, 80%, 100%, and 120% on one side.

[0023] like Figure 5 As shown, the rear end reinforcement of the diamond hanging basket main truss includes 1# distribution beam 10, gasket 11, nut 12, and fine-rolled threaded steel bar 14, wherein 1# distribution beam 10 is vertically arranged.

[0024] When applied, this embodiment includes the following process: Before the preloading begins, measure and collect the distance between the front end members 9 of the two main trusses LA0 and the distance between the rear anchor boxes 6 LB0; The first time, the oil top 17 applies 60% load, and the distance between the front rods 9 of the two main trusses LA1 and the distance between the rear anchor boxes 6 LB1 are measured; The second time, the oil top 17 applies 80% load, and the distance between the front rods 9 of the two main trusses LA2 and the distance between the rear anchor boxes 6 LB2 are measured; The third time, the oil top 17 applies 100% load, and the distance between the front rods 9 of the two main trusses LA3 and the distance between the rear anchor boxes 6 LB3 are measured; The fourth time, the oil top 17 applies 120% load, and the distance between the front rods 9 of the two main trusses LA4 and the distance between the rear anchor boxes 6 LB4 are measured; After unloading to 0% load, the distance between the front end members 9 of the two main trusses, LA5, and the distance between the rear end anchor boxes 6, LB5, were measured and collected.

[0025] ①Total deformation of main truss = Reading after loading stabilizes - Initial reading = (LA0 - LA4) - (LB4 - LB0).

[0026] ② Inelastic deformation = Unloaded reading - Initial reading = (LA0 - LA5) - (LB5 - LB0).

[0027] ③ Elastic deformation =Total deformation - Inelastic deformation =[(LA0 - LA4)-(LB4 - LB0]-[(LA0 - LA5) - (LB5 - LB0)].

[0028] Preload test requirements: 1) 6 hours after each level of preloading is completed, all measuring points should be observed, and the deformation data should be recorded to determine the deformation results.

[0029] 2) 12 hours after the final load preloading is completed, observations should be carried out to determine the deformation value. If there is no change within 24 hours, it should be considered stable and unloading can be carried out.

[0030] 3) After unloading is completed, the measuring point should be observed for the last time in time and the corresponding deformation value should be recorded.

[0031] 4) The maximum deformation of the hanging basket is ≤20mm.

[0032] In this embodiment, two diamond-shaped hanging basket main trusses are symmetrically assembled on the ground, three cushion beams 15 are set between the front support box and the rear anchor box between the two main trusses, the rear end of the diamond hanging basket is reinforced by six precision-rolled threaded steel bars 14, and the front end of the main truss is reinforced by two precision-rolled threaded steel bars 14. The centers of all rods are controlled to be in the same horizontal plane, and an oil top is set on one side of the front end to simulate the application of 1.2 times the dead weight of the segment to apply graded loads to pre-stress the main truss, so that the input of pre-stressing materials of traditional sandbags or precast concrete blocks is reduced, the cost is lower, and the economy is better.

[0033] The hydraulic oil-through jack 17 simulates the deadweight load of the suspended casting segment and applies the preload in grades (60%, 80%, 100%, 120%), so that the application and control of the preload are more precise and the preloading effect of the main truss of the hanging basket is better.

[0034] The diamond-shaped hanging basket main truss ground reaction preloading system avoids the loading preloading and hoisting operations during the unloading process at the traditional segment bridge location, and avoids the safety risks of hoisting operations in the effective space of the suspended cast-in-place segment hanging basket, making the hanging basket preloading process safer.

[0035] Through the ground reaction preloading system, there is no need to wait until the strength of the 0# concrete block reaches the design value before preloading after the installation of the diamond hanging basket. The preloading of the main truss of the diamond hanging basket can be carried out simultaneously with the 0# construction, which shortens the preloading period of the main truss of the hanging basket and is more conducive to the optimization of the suspended pouring construction period.

[0036] 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 diamond hanging basket main truss reaction force preloading system, characterized by: It is composed of two rhombus-shaped hanging basket main trusses symmetrically assembled, wherein the rhombus-shaped hanging basket main trusses are assembled from rods, and the rods include a lower horizontal rod, a column, a rear pull rod, an upper horizontal rod, and a front oblique rod, wherein the lower horizontal rod, the rear pull rod, the upper horizontal rod and the front oblique rod are connected to form a rhombus structure, and the column is arranged between the lower horizontal rod and the upper horizontal rod; The upper horizontal bars of the two diamond-shaped hanging basket main trusses are fixed through fine-rolled threaded steel bars, and an oil cap is provided at the end of the fine-rolled threaded steel bar of one diamond-shaped hanging basket main truss; The lower horizontal rods of the two diamond-shaped hanging basket main trusses are fixed through precision-rolled threaded steel bars.

2. The diamond hanging basket main truss reaction preloading system according to claim 1 is characterized in that: The lower horizontal rod and the rear pull rod are connected via a rear anchor box, the rear pull rod and the upper horizontal rod are connected via a rear upper box, the upper horizontal rod and the front oblique rod are connected via a front upper box, the front oblique rod and the lower horizontal rod are connected via a front support box, and the column is arranged between the front support box and the rear upper box.

3. The diamond hanging basket main truss reaction preloading system according to claim 2 is characterized in that: Pad beams are respectively arranged between the front support boxes of the two rhombus-shaped main trusses and the rear anchor boxes therebetween.

4. The diamond hanging basket main truss reaction preloading system according to claim 2 is characterized in that: The rear anchor box, the rear upper box, the front upper box and the front support box are pin-connected with their respective corresponding rods, and the rear anchor box, the rear upper box, the front upper box and the front support box are respectively provided with a plurality of pin-connecting holes for connecting with their respective corresponding rods.

5. The diamond hanging basket main truss reaction preloading system according to claim 1 is characterized in that: Distribution beams are respectively arranged at the two ends of the finish-rolled threaded steel bar.

6. The diamond hanging basket main truss reaction preloading system according to claim 5 is characterized in that: The ends of the finished rolled threaded steel bars between the upper flat bars are provided with vertical distribution beams and transverse distribution beams.

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