Construction method of driving and sliding of roof grid steel structure in large garbage pool

Abstract

The present invention relates to the field of on-site preparation, transportation or processing of building materials or building components, and specifically to a method for sliding a roof grid steel structure in a large garbage pool. A method for sliding a roof grid steel structure in a large garbage pool is characterized by: performing the following steps in sequence: step 1, segmentation; step 2, assembling a bracket; step 3, erecting a column; step 4, hoisting; step 5, traction; step 6, fixing; step 7, repeating. The present invention has high installation accuracy and high construction efficiency.

Description

Technical Field

[0001] The invention relates to the field of on-site preparation, transportation or processing of building materials or building components, and in particular to a construction method for a roof grid steel structure driving and sliding in a large garbage pool. Background Art

[0002] A renewable energy utilization center project is different from a conventional waste incineration power plant. In addition to the environmental protection exhibition center, the entire site introduces a "large roof structure" to cover the main plant and ancillary rooms as a whole. The large roof support system adopts a steel structure, which is divided into four areas of ACFG, with a total of about 30,000 tons of steel structure. The garbage pool of this project belongs to Area A, and its concrete frame structure is 56 meters high. According to the process requirements, the garbage pit is equipped with a double-layer steel structure light grid roof, of which the inner roof elevation is 41 meters (set on the corresponding elevation of the garbage pool frame column) and the outer roof elevation is 56 meters (set on the top of the garbage pool frame column). According to the process requirements, the inner roof is mainly to ensure air tightness and prevent the odor of the garbage pool from overflowing, so a foamed cement board with good airtightness is used, and the main structure of the roof adopts a spatial steel grid structure system.

[0003] Due to the tight construction plane and construction period of this project, there are serious cross-operations in the actual construction. The garbage pool area in Area A is adjacent to the core area of ​​4 boiler equipment in the north, and the unloading hall and office area (both about 30 meters high) in the south and east respectively. In order to ensure the production node, each area must be constructed simultaneously, and when the roof in the garbage pool is ready for installation, other surrounding areas have been completed. Due to the plane and space restrictions, it is extremely difficult to position the steel structure installation crane. The conventional steel structure hoisting construction process cannot meet the target demand of completing the installation of large-scale steel structures in a short construction period of this project. Summary of the invention

[0004] In order to overcome the defects of the prior art and provide a steel structure construction method with high installation accuracy and high construction efficiency, the present invention discloses a crane sliding construction method for a roof grid steel structure in a large garbage pool.

[0005] The present invention achieves the purpose of the invention through the following technical solutions:

[0006] A method for sliding construction of a roof grid steel structure in a large garbage pool, characterized by: implementing the following steps in sequence:

[0007] Step 1, Segmentation: The roof frame in the garbage pool is segmented and numbered. In order to ensure the efficiency of the internal roof installation, it is planned to divide the entire garbage pool internal roof into 7 units, and each unit is assembled on the ground;

[0008] Step 2, assembly bracket: Arrange the assembly bracket on the west side of the office area in Zone A as the site for segmented assembly of the steel structure. The cradle is arranged at the truss node. The cradle uses 300*300 H-shaped steel. When assembling the first truss, support 2 100*5 angle steels around each vertical member;

[0009] Step 3: Build the columns: Use 350*350 steel and [14 channel steel to build the supporting columns on the garbage pool driving beam, and place 2 sets of Bailey frames (21*21*1.5m) horizontally on the columns. Each set of Bailey frames contains 21 pieces, and the size of a single piece is 3*0.9*1.5m;

[0010] Step 4, Hoisting: Before hoisting, arrange traction ropes at the four corners of the truss to facilitate the adjustment of the truss position in the air. Use a 750t crawler crane to slowly lift the assembled truss unit off the tire frame, transport the truss to the top of the crane, slowly drop the hook to put the truss on the Bailey frame platform, and remove the wire rope after the truss is placed stably;

[0011] Step 5, traction: pre-embedded parts are arranged on the wall in advance, and hooks are welded on the embedded parts to hang hand chain hoists. Full-time commanders use whistles as instructions to command operators to use guide chains and hand chain hoists to slowly pull the crane to move along the AT-AA axis direction;

[0012] The truss slides at the position of +0.1m of the design elevation. The truss stops sliding after sliding above the fixing bolts. Then, four 15t jacks are placed on the structural bull legs at the four landing points respectively. A 12mm steel plate is placed on the upper part of the Bailey frame in the center of the tire frame. The jack is placed in the center of the steel plate to ensure that the weight is always on the four center points of the tire frame when lifting the truss. Then, four people slowly lift the truss 30mm. After the truss is pulled to the fixed position, the truss support on the Bailey frame is removed. After the support is removed, the truss is slowly lowered to the design elevation with the jack, and the column foot bottom plate is connected with the pre-buried bolts. After the truss column is implemented on the structural bull leg, the bolts are fixed to complete the unloading of the truss.

[0013] Step 6, Fixing: After the truss of the second unit is slid into place and fixed, the main rod is welded and fixed. After the main rod is fixed, two steel springboards are laid on the truss. The springboards are tied to the truss with steel wire ropes. At the same time, angle steels are welded and fixed at 1 / 3 and 2 / 3 of the springboards. After the pipes are welded and fixed, the tie rods are slowly pulled up with a traction rope, and the connecting plates of the pipes are overlapped and aligned with the connecting plates on the truss. The two connecting plates are fixed with high-strength bolts;

[0014] Step 7, repeat: and so on, slide all 7 integral trusses into place.

[0015] The above-mentioned method for driving and sliding construction of roof grid steel structure in a large garbage pool is characterized by:

[0016] In step 3, the dimensions of the Bailey frame are: 4.35m long, 3.5m wide and 4m high. The main material is HW350*350 H-shaped steel, and the diagonal brace is made of [14 channel steel. A clamp is welded on the inner side of the bottom steel to fix the column and the crane beam to prevent the column from moving during sliding. Two HW350 H-shaped steels are evenly welded on the top of the frame. The Bailey frame is welded and fixed to the steel at the top of the frame using a U-shaped steel plate. A truss support is placed on the Bailey frame at intervals of 4.1m.

[0017] The present invention has the following beneficial effects:

[0018] The present invention, through specific analysis and research, utilizes a special unconventional construction process in which a Bailey frame is horizontally arranged on the garbage pool crane beam, and the steel structure grid that is assembled offline in pieces is slid to the designed position by means of a hand winch. This effectively ensures installation accuracy, speeds up construction efficiency, and lays a good foundation for the smooth implementation of the project. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a cross-sectional layout diagram of the main workshop in the present invention,

[0020] Figure 2 It is a front view of the tire frame in the present invention,

[0021] Figure 3 is a side view of the bracket in the present invention,

[0022] Figure 4 is a schematic diagram of the truss assembly support points in the present invention,

[0023] Figure 5 It is a schematic diagram of the diagonal brace of the truss vertical assembly in the present invention,

[0024] Figure 6 It is a schematic diagram of the support frame in the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described below by means of specific examples. Example 1

[0026] According to the process configuration requirements of a renewable energy utilization center project, the garbage pool is designed with a double-layer steel structure light grid roof. Due to the plane and space limitations, it is extremely difficult to install the crane position for the inner roof steel structure. The conventional steel structure hoisting construction process cannot meet the target demand of completing the installation of large-volume steel structures in a short construction period. Due to the plane and space conditions of the garbage pool, it is not easy to install the bulk by crane position. Therefore, after exploration, it was decided to abandon the conventional overall sliding and use the garbage crane to slide to install the inner roof.

[0027] The construction method of sliding crane for the grid steel structure roof in a large garbage pool is adopted. The inner roof has a total of 31 single-piece trusses with a length of 35.3m. The inner roof trusses are divided into 7 sliding units. The single pieces are assembled into a whole on the ground in advance for sliding. At the same time, 3 groups of Bailey frames are arranged horizontally on the garbage pool driving beam. The assembled trusses are lifted onto the Bailey frames by crawler cranes, and the crane is moved to the fixed position of the truss by manual hoist. After it is in place, the jack is used to control the truss to fall to the embedded screws for fixing.

[0028] like Figure 1 to Figure 6 As shown, the specific steps are as follows:

[0029] Step 1, Segmentation: The roof frame in the garbage pool is segmented and numbered. In order to ensure the efficiency of the internal roof installation, it is planned to divide the entire garbage pool internal roof into 7 units, and each unit is assembled on the ground;

[0030] Step 2, assembly bracket: Arrange the assembly bracket on the west side of the office area in Zone A as the site for segmented assembly of the steel structure. The cradle is arranged at the truss node. The cradle uses 300*300 H-shaped steel. When assembling the first truss, support 2 100*5 angle steels around each vertical member;

[0031] Step 3: Build the columns: Use 350*350 steel and [14 channel steel to build the supporting columns on the garbage pool driving beam, and place 2 sets of Bailey frames (21*21*1.5m) horizontally on the columns. Each set of Bailey frames contains 21 pieces, and the size of a single piece is 3*0.9*1.5m;

[0032] The dimensions of the Bailey frame are as follows: 4.35m long, 3.5m wide and 4m high. The main material is HW350*350 H-shaped steel. The diagonal brace is made of [14 channel steel. A clamp is welded on the inner side of the bottom steel to fix the column and the crane beam to prevent the column from moving during sliding. Two HW350 H-shaped steels are evenly welded on the top of the frame. The Bailey frame is welded and fixed to the steel on the top of the frame using a U-shaped steel plate. A truss support is placed on the Bailey frame at intervals of 4.1m.

[0033] Step 4, Hoisting: Before hoisting, arrange traction ropes at the four corners of the truss to facilitate the adjustment of the truss position in the air. Use a 750t crawler crane to slowly lift the assembled truss unit off the tire frame, transport the truss to the top of the crane, slowly drop the hook to put the truss on the Bailey frame platform, and remove the wire rope after the truss is placed stably;

[0034] Step 5, traction: pre-embedded parts are arranged on the wall in advance, and hooks are welded on the embedded parts to hang hand chain hoists. Full-time commanders use whistles as instructions to command operators to use guide chains and hand chain hoists to slowly pull the crane to move along the AT-AA axis direction;

[0035] The truss slides at the position of +0.1m of the design elevation. The truss stops sliding after sliding above the fixing bolts. Then, four 15t jacks are placed on the structural bull legs at the four landing points respectively. A 12mm steel plate is placed on the upper part of the Bailey frame in the center of the tire frame. The jack is placed in the center of the steel plate to ensure that the weight is always on the four center points of the tire frame when lifting the truss. Then, four people slowly lift the truss 30mm. After the truss is pulled to the fixed position, the truss support on the Bailey frame is removed. After the support is removed, the truss is slowly lowered to the design elevation with the jack, and the column foot bottom plate is connected with the pre-buried bolts. After the truss column is implemented on the structural bull leg, the bolts are fixed to complete the unloading of the truss.

[0036] Step 6, Fixing: After the truss of the second unit is slid into place and fixed, the main rod is welded and fixed. After the main rod is fixed, two steel springboards are laid on the truss. The springboards are tied to the truss with steel wire ropes. At the same time, angle steels are welded and fixed at 1 / 3 and 2 / 3 of the springboards. After the pipes are welded and fixed, the tie rods are slowly pulled up with a traction rope, and the connecting plates of the pipes are overlapped and aligned with the connecting plates on the truss. The two connecting plates are fixed with high-strength bolts;

[0037] Step 7, repeat: and so on, slide all 7 integral trusses into place.

[0038] This project has been successfully used in a renewable energy utilization center project. Since the large roof structure column of the project is large, the height is high, and the construction period is very tight, this embodiment is aimed at the heavy roof steel structure covered with soil in a large-scale waste incineration power plant. Due to the difficulty of crane positioning due to the plane and space conditions of the garbage pool, it is difficult to solve the problem of low construction efficiency of conventional installation or overall sliding solutions, and successfully optimizes the mold-turning construction process used in the original project, which wins precious time for the subsequent roof structure construction of the project.

Claims

1. A method for sliding construction of a roof grid steel structure in a large garbage pool, characterized by: Follow the steps below to implement: Step 1, Segmentation: The roof frame in the garbage pool is segmented and numbered. In order to ensure the efficiency of the internal roof installation, it is planned to divide the entire garbage pool internal roof into 7 units, and each unit is assembled on the ground; Step 2, assembly bracket: Arrange the assembly bracket on the west side of the office area in Zone A as the site for segmented assembly of the steel structure. The cradle is arranged at the truss node. The cradle uses 300*300 H-shaped steel. When assembling the first truss, support 2 100*5 angle steels around each vertical member; Step 3, build columns: Use 350*350 steel and [14 channel steel to build supporting columns on the garbage pool driving beam, and place 2 sets of 21*21*1.5m Bailey frames horizontally on the columns. Each set of Bailey frames contains 21 pieces, and the size of a single piece is 3*0.9*1.5m; Step 4, Hoisting: Before hoisting, arrange traction ropes at the four corners of the truss to facilitate the adjustment of the truss position in the air. Use a 750t crawler crane to slowly lift the assembled truss unit off the tire frame, transport the truss to the top of the crane, slowly drop the hook to put the truss on the Bailey frame platform, and remove the wire rope after the truss is placed stably; Step 5, traction: pre-embedded parts are arranged on the wall in advance, and hooks are welded on the embedded parts to hang hand chain hoists. Full-time commanders use whistles as instructions to command operators to use guide chains and hand chain hoists to slowly pull the crane to move along the AT-AA axis direction; The truss slides at the position of +0.1m of the design elevation. The truss stops sliding after sliding above the fixing bolts. Then, four 15t jacks are placed on the structural bull legs at the four landing points respectively. A 12mm steel plate is placed on the upper part of the Bailey frame in the center of the tire frame. The jack is placed in the center of the steel plate to ensure that the weight is always on the four center points of the tire frame when lifting the truss. Then, four people slowly lift the truss 30mm. After the truss is pulled to the fixed position, the truss support on the Bailey frame is removed. After the support is removed, the truss is slowly lowered to the design elevation with the jack, and the column foot bottom plate is connected with the pre-buried bolts. After the truss column is implemented on the structural bull leg, the bolts are fixed to complete the unloading of the truss. Step 6, Fixing: After the truss of the second unit is slid into place and fixed, the main rod is welded and fixed. After the main rod is fixed, two steel springboards are laid on the truss. The springboards are tied to the truss with steel wire ropes. At the same time, angle steels are welded and fixed at 1 / 3 and 2 / 3 of the springboards. After the pipes are welded and fixed, the tie rods are slowly pulled up with a traction rope, and the connecting plates of the pipes are overlapped and aligned with the connecting plates on the truss. The two connecting plates are fixed with high-strength bolts; Step 7, repeat: and so on, slide all 7 integral trusses into place.

2. The method for sliding construction of a roof grid steel structure in a large garbage pool as claimed in claim 1, characterized in that: In step 3, the dimensions of the Bailey frame are: 4.35m long, 3.5m wide and 4m high. The main material is HW350*350 H-shaped steel, and the diagonal brace is made of [14 channel steel. A clamp is welded on the inner side of the bottom steel to fix the column and the crane beam to prevent the column from moving during sliding. Two HW350 H-shaped steels are evenly welded on the top of the frame. The Bailey frame is welded and fixed to the steel at the top of the frame using a U-shaped steel plate. A truss support is placed on the Bailey frame at intervals of 4.1m.

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