Installation method of inverted triangle secondary truss device

Abstract

The invention relates to the technical field of building construction, and discloses a mounting method of an inverted triangular secondary truss device, which comprises the following steps: S1, an adjustable sleeve with an axial notch is slidably sleeved on one end of a chord member of a secondary truss, and then the secondary truss is horizontally hoisted to a to-be-mounted position; s2, after the non-sleeve end of the chord member of the secondary truss is subjected to coarse positioning, the adjustable sleeve is axially pushed to abut against the chord member of the primary truss along the chord member sleeve end of the secondary truss; s3, the adjustable casing pipe rotates around the chord member casing pipe end axis of the secondary truss, so that an intersecting opening of the adjustable casing pipe is attached to the main truss chord member in a full-circumference mode, and the installation precision is verified; and S4, the adjustable sleeves are welded and fixed to the primary truss and the secondary truss correspondingly. The adjustable sleeve is arranged on the periphery of the chord member of the secondary truss in a sleeving manner, so that radial and axial adjustment is realized; notch welding is carried out after the secondary trusses are accurately positioned, and node stress concentration is effectively reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a mounting method of inverted triangular secondary truss device. BACKGROUND

[0002] With the development of pipe truss steel structure, more and more large public buildings and water transportation system engineering use inverted triangular truss with large span. The conventional inverted triangular secondary truss includes a main truss, a secondary truss and a secondary truss chord. In the construction of large-span pipe truss structure of coal shed, the installation of the secondary truss has great limitations. The pipe opening of the secondary truss chord is a through opening, which cannot be directly hoisted and installed. It needs to be installed by moving the main truss. If the through opening of the two ends of the chord of the secondary truss is made with deviation, it will also affect the installation of the secondary truss. In addition, the installation of the secondary truss cannot compensate for the radial edge deviation and angle deviation. It needs to be cut and welded on site, or the chord is cut off and embedded in the high-altitude adjustment, which leads to repeated hoisting and adjustment of the secondary truss in the air. The installation occupies labor, machinery, measures materials and time for a long time. The construction efficiency is low and the secondary processing cost is increased, which has quality risks. SUMMARY

[0003] The present application is made to solve the above technical problems. The purpose is to provide a mounting method of inverted triangular secondary truss device, which can realize the rapid installation of large-span inverted triangular pipe truss and quickly complete the sleeve pipe connection, avoiding the problems of cutting and repeated adjustment in the air.

[0004] In order to achieve the above purpose, the present application provides a mounting method of inverted triangular secondary truss device, which includes the following steps: S1: slidingly sleeving an adjustable sleeve pipe provided with an axial slot into one end of the chord of the secondary truss, and then horizontally hoisting the secondary truss to the installation position; S2: after rough positioning the chord sleeve pipe end of the secondary truss, pushing the adjustable sleeve pipe along the chord sleeve pipe end of the secondary truss to the top of the main truss chord; S3: rotating the adjustable sleeve pipe around the axial line of the chord sleeve pipe end of the secondary truss, so that the through opening of the adjustable sleeve pipe is fully attached to the main truss chord, and the installation accuracy is checked; S4: welding and fixing the adjustable sleeve pipe with the main truss and the secondary truss respectively.

[0005] Preferably, the adjustable sleeve pipe is a circular pipe; wherein, The inner diameter of the adjustable sleeve pipe is 4-6mm larger than the outer diameter of the secondary truss.

[0006] Preferably, the slot is provided on the inner wall of one end of the adjustable sleeve pipe, wherein, The notches are evenly distributed around the adjustable sleeve and the distance between adjacent notches is the same. One end of the adjustable sleeve provided with the notches is sleeved on the secondary truss.

[0007] Preferably, the end of the adjustable sleeve away from the notches is in a U-shaped structure; wherein, The U-shaped structure abuts on one side of the main truss.

[0008] Preferably, the length of the adjustable sleeve is 300-400mm, wherein, The length of the notches is 1 / 2-2 / 3 of the length of the adjustable sleeve; The length of the adjustable sleeve sleeved on the secondary truss is 1 / 2-5 / 6 of the length of the adjustable sleeve; The length of the rod segment of the secondary truss chord is 1 / 2-1 / 4 longer than the length of the adjustable sleeve.

[0009] Preferably, when the secondary truss is hoisted horizontally, the lifting points are arranged on the secondary truss, and the distance between the lifting points is 1 / 3-1 / 4 of the distance between the connection of the main truss and the secondary truss and the center of gravity of the secondary truss.

[0010] Preferably, before step S1, the method further comprises: Polishing the outer walls of the main truss and the secondary truss.

[0011] Preferably, before step S4, the method further comprises: Symmetrically spot welding and fixing the pipe wall of the adjustable sleeve and the outer surface of the secondary truss along the weld seams on both sides of the notches.

[0012] Preferably, in step S4, the welding and fixing of the main truss and the secondary truss comprises: welding at the ports of the notches, then welding the adjustable sleeve and the secondary truss at the ports of the secondary truss sleeved with the adjustable sleeve, and finally welding the adjustable sleeve and the connection of the main truss.

[0013] Preferably, in step S4, the welding and fixing of the main truss and the secondary truss further comprises: During welding, stress is eliminated by hammering after each layer of welding is completed, and then the next welding is performed after the temperature between the welded layers is cooled to below 120℃.

[0014] According to the above description and practice, the installation method of the inverted triangular secondary truss device has the following advantages compared with the traditional installation method: 1. Through the radial and axial adjustment structure of the sleeve, the on-site cutting correction process is eliminated, the single node construction time is shortened compared with the traditional process time, and the construction efficiency is improved; 2. Suitable for large-span inverted triangular truss installation. Through the triple tolerance design (radial gap compensation + deep sleeve constraint + U-shaped groove welding), the installation efficiency and installation accuracy are greatly improved; 3. The construction cost is significantly reduced, the material waste is reduced, and the high-altitude operation time and the cost of building construction are saved; 4. The safety performance is improved, the high-altitude operation time and the adjustment times are reduced, the high-altitude operation risk is reduced through pre-assembly on the ground, and the construction safety is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is an installation schematic diagram of the inverted triangular sub-truss device involved in an embodiment of the present application.

[0016] Figure 2 It is a structural schematic diagram of the adjustable sleeve involved in an embodiment of the present application.

[0017] Figure 3 It is a hoisting schematic diagram of the adjustable sleeve into the sub-truss involved in an embodiment of the present application.

[0018] Figure 4 It is a hoisting schematic diagram of the inverted triangular sub-truss device involved in an embodiment of the present application.

[0019] Figure 5 It is a structural schematic diagram of the notch involved in an embodiment of the present application.

[0020] Figure 6 It is a structural schematic diagram of the connection of the sub-truss and the adjustable sleeve involved in an embodiment of the present application.

[0021] Figure 7 It is a structural schematic diagram of the connection of the adjustable sleeve and the main truss chord involved in an embodiment of the present application.

[0022] Figure 8 It is a flowchart of the installation method of the inverted triangular sub-truss device involved in an embodiment of the present application.

[0023] The reference numerals in the drawings are: 1, main truss; 11, main truss chord; 2, sub-truss; 21, chord sleeve-free end of sub-truss; 22, chord sleeve end of sub-truss; 3, adjustable sleeve; 31, notch; 4, connection between sub-truss and middle part of adjustable sleeve; 5, connection between adjustable sleeve and main truss chord. DETAILED DESCRIPTION

[0024] Example implementations will now be described more fully with reference to the accompanying drawings. Example implementations may, however, be implemented in many different forms and should not be construed as limited to the implementations set forth herein; rather, these implementations are provided so that this disclosure will be thorough and complete, and will fully convey the inventive aspects to those skilled in the art. The described features, structures, or characteristics can be combined in one or more implementations.

[0025] In addition, the accompanying drawings are included to provide a further understanding of the present disclosure and are incorporated in and constitute a part of this specification. The drawings illustrate exemplary embodiments and, as such, a change in the illustrative embodiments should not be construed as departing from the spirit and scope of the present disclosure. In the drawings:

[0026] Unless explicitly stated otherwise and / or limited otherwise, the terms "mounting", "connected", "connecting" should be interpreted broadly, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] The specific embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0028] In order to illustrate the inverted triangular sub-truss device provided by the present application, Figures 1 to 7 The specific structure of the inverted triangular sub-truss device is shown from different angles.

[0029] Please refer to Figures 1 to 8 The present application also provides a mounting method of the inverted triangular sub-truss device, the mounting method comprising the following steps: S1: slidingly sleeving the adjustable sleeve 3 provided with the axial notch 31 on one end of the chord of the sub-truss 2, and then horizontally hoisting the sub-truss 2 to the installation position; S2: after rough positioning the chord pipe sleeveless end 21 of the secondary truss, push the adjustable sleeve 3 along the chord pipe sleeve end 22 of the secondary truss axially to the main truss chord pipe; S3: rotate the adjustable sleeve 3 around the axis of the chord pipe sleeve end 22 of the secondary truss, so that the whole circumference of the adjustable sleeve 3 penetrates the main truss chord pipe 11, and check the installation accuracy; S4: weld and fix the adjustable sleeve 3 with the main truss 1 and the secondary truss 2 respectively.

[0030] In the installation method of the inverted triangular secondary truss device, the outer surfaces of the main truss chord pipe 11 of the main truss 1 and the chord pipe sleeve end 22 of the secondary truss 2 are surface treated. The oxidation layer and oil stains on the main truss 1 and the secondary truss 2 are removed by grinding, so that the metal substrate is in a clean and rough state, and the welding bonding strength is ensured. The pipe wall of the adjustable sleeve 3 is provided with an axially extending notch 31. Before installation, the adjustable sleeve 3 is slid onto the chord pipe sleeve end 22 of the secondary truss 2. Then the secondary truss 2 is hoisted, and the hoisting is in a horizontal hoisting manner, which can ensure that the component will not be deformed too much during hoisting. After the secondary truss 2 is hoisted to the position to be installed, the chord pipe sleeveless end 21 of the secondary truss is first fixed, and the fixing can be temporary welding or other reliable temporary fixing method. Then the adjustable sleeve 3 is pushed along the axis direction of the chord pipe sleeve end 22 of the secondary truss until the end face abuts against the main truss chord pipe 11. After the adjustable sleeve 3 abuts against the main truss chord pipe 11, it is rotated circumferentially for adjustment. The construction personnel rotate the adjustable sleeve 3 around the axis of the chord pipe sleeve end 22 of the secondary truss, so that the penetration opening of the adjustable sleeve 3 can be in full contact with the surface of the main truss chord pipe 11. In order to ensure the installation accuracy, a total station or other measuring instrument is used for checking, and the radial edge deviation and installation gap are controlled within the allowable range. The construction personnel should point weld the pipe wall of the adjustable sleeve 3 with the outer surface of the secondary truss 2 along the weld seams on both sides of the notch 31, and the weld point spacing is uniformly arranged. The final welding and fixing work is carried out in a specific order. The port of the notch 31 is welded, the notch 31 is symmetrically full-welded, then the adjustable sleeve 3 and the secondary truss 2 are welded with each other at the port of the secondary truss 2 with the adjustable sleeve 3, and finally the adjustable sleeve 3 and the main truss 1 are welded with each other at the connection position, wherein the connection position 5 of the adjustable sleeve 3 and the main truss chord pipe 11 adopts a U-shaped structure for groove welding, so as to ensure the connection strength. During the whole welding process, the welding heat input is controlled, and hammering is performed after each layer of welding is completed to eliminate stress. The welding layer is cooled to below 120℃ before the next welding is performed, which can effectively control the welding deformation and residual stress.

[0031] Further, the adjustable sleeve 3 is a circular tube, the inner diameter of the adjustable sleeve 3 is 4-6mm larger than the outer diameter of the chord of the secondary truss 2, which not only ensures smooth sliding of the adjustable sleeve 3, but also provides sufficient deviation compensation space, the notches 31 are evenly distributed around the adjustable sleeve 3 and the interval distance between adjacent notches 31 is the same, the inner end of the adjustable sleeve 3 provided with the notches 31 is sleeved with the secondary truss 2, the interval distribution and the large inner diameter reduce the welding stress concentration coefficient between the adjustable sleeve 3 and the secondary truss 2, and the air layer in the gap also temporarily plays a heat insulation role, reducing the welding heat affected zone.

[0032] Further, the length of the adjustable sleeve 3 is 300-400mm, the chord of the secondary truss 2 is shortened by 100-150mm compared with the original length, and the length of the notch 31 is 1 / 2-2 / 3 of the length of the adjustable sleeve 3. The size range ensures that the welding gun can be smoothly welded, and at the same time provides an operation channel for stress relief hammering, and the residual stress relief efficiency is improved.

[0033] Among them, the length of the adjustable sleeve 3 sleeved on the secondary truss is 1 / 2-5 / 6 of the length of the adjustable sleeve. According to the coverage distance, sufficient contact surface is provided to prevent accidental sliding during construction.

[0034] Further, the chord length of the secondary truss 2 is 1 / 2-1 / 4 longer than the length of the adjustable sleeve 3. The end of the adjustable sleeve away from the notch is provided in a U shape; wherein the end of the adjustable sleeve away from the notch is abutted on one side of the main truss, and when the secondary truss 2 is horizontally hoisted, the lifting points are arranged on the secondary truss 2, and the distance between the lifting points is 1 / 3-1 / 4 of the distance between the connection between the main truss 1 and the secondary truss 2 and the center of gravity of the secondary truss 2.

[0035] The installation method of the present application realizes the three-dimensional adjustable connection between the secondary truss 2 and the main truss 1 through the ingenious design of the adjustable sleeve 3. The radial gap between the sleeve and the chord provides a radial adjustment space, the length allowance of the sleeve provides an axial adjustment space, and the rotation function of the sleeve provides an angle adjustment capability. This design makes the installation process more flexible and efficient, and can effectively compensate for various deviations in construction. The scientific arrangement of the welding sequence ensures the strength and stability of the connection node. The whole installation process is simple and easy to understand, and the operation is simple, which greatly improves the construction efficiency and quality.

[0036] In actual engineering application, the method is particularly suitable for installation of large-span inverted triangular truss. Compared with the traditional installation method, the method does not need high-altitude cutting and trimming operation, reduces high-altitude operation time and safety risk. Meanwhile, since a standardized installation process is adopted, construction quality is more controllable, and node performance is more reliable. The method has good inclusiveness for processing error of main and secondary trusses, can adapt to size deviation within a certain range, and reduces the requirement for component processing precision.

[0037] To sum up, the application adopts the integrated process of "sleeve adjustment joint + notched welding", the sleeve is sleeved outside the original secondary truss chord, can be adjusted in radial and axial directions, after the secondary truss is installed in place, the notched weld is filled, stress gradient is released, residual stress is reduced, the inverted triangular secondary truss fast installation and installation quality requirement are met, and the integrity of the base material is also protected.

[0038] It should be noted that the specific numerical values involved in the above embodiments are only examples, and in actual application, appropriate adjustment can be made according to engineering needs. Based on the understanding of the principles of the application, those skilled in the art can make various modifications or deformations to the above embodiments, and these modifications or deformations should be covered within the protection scope of the application. The protection scope of the application should be defined by the claims.

Claims

1. A method for installing an inverted triangular secondary truss device, characterized in that, Includes the following steps: S1: Slide the adjustable sleeve with an axial groove onto one end of the chord of the secondary truss, and then horizontally hoist the secondary truss to the installation position; S2: After coarsely positioning the unsleeved end of the chord of the secondary truss, push the adjustable sleeve axially along the sleeve end of the chord of the secondary truss until it is pressed against the chord of the main truss. S3: Rotate the adjustable sleeve around the axis of the chord sleeve end of the secondary truss so that the intersection of the adjustable sleeve is fully fitted with the chord of the main truss, and check the installation accuracy; S4: Weld the adjustable sleeve to the main truss and the secondary truss respectively.

2. The installation method of the inverted triangular secondary truss device as described in claim 1, characterized in that, The adjustable sleeve is a round tube; wherein... The inner diameter of the adjustable sleeve is 4-6 mm larger than the outer diameter of the secondary truss.

3. The installation method of the inverted triangular secondary truss device as described in claim 1, characterized in that, The slot is provided on the inner wall of one end of the adjustable sleeve, wherein, The slots are evenly distributed around the adjustable sleeve, and the distance between adjacent slots is the same. The adjustable sleeve with the slot is fitted onto the secondary truss at one end.

4. The installation method of the inverted triangular secondary truss device as described in claim 1, characterized in that, The end of the adjustable sleeve furthest from the slot has a U-shaped structure; wherein... The U-shaped structure abuts against one side of the main truss.

5. The installation method of the inverted triangular secondary truss device as described in claim 1, characterized in that, The length of the adjustable sleeve is 300~400mm, wherein, The length of the slot is 1 / 2 to 2 / 3 of the length of the adjustable sleeve; The adjustable sleeve is fitted onto the secondary truss for a length of 1 / 2 to 5 / 6 of the length of the adjustable sleeve. The length of the secondary truss chord segment is 1 / 2 to 1 / 4 longer than the length of the adjustable sleeve.

6. The installation method of the inverted triangular secondary truss device as described in claim 1, characterized in that, When the secondary truss is horizontally hoisted, the hoisting points are set on the secondary truss, and the distance between the hoisting points is 1 / 3 to 1 / 4 of the distance between the connection between the main truss and the secondary truss and the center of gravity of the secondary truss.

7. The installation method of the inverted triangular secondary truss device as described in claim 1, characterized in that, Before step S1, the following is also included: The outer walls of the main truss and the secondary truss are polished.

8. The installation method of the inverted triangular secondary truss device as described in claim 1, characterized in that, Before step S4, the following is also included: Along the weld seams on both sides of the slot, the wall of the adjustable sleeve is symmetrically spot-welded to the outer surface of the secondary truss.

9. The installation method of the inverted triangular secondary truss device as described in claim 1, characterized in that, In step S4, welding and fixing the main truss and the secondary truss includes: welding the port of the slot, then welding the adjustable sleeve to the secondary truss at the port of the secondary truss where the adjustable sleeve is fitted, and finally welding the adjustable sleeve to the connection point of the main truss.

10. The installation method of the inverted triangular secondary truss device as described in claim 9, characterized in that, In step S4, welding and fixing the main truss to the secondary truss further includes: During the welding process, stress is relieved by hammering after each layer is welded, and welding is continued only after the temperature between the welded layers cools down to below 120°C.

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