A support frame body integrated construction method for building structure demolition and new construction

Abstract

The present application relates to the technical field of building floor (2) structure reconstruction construction, and particularly relates to a support frame body integrated construction method for building structure demolition and new construction. The construction steps comprise determining the height difference of building structure demolition and new construction; removing the floor (2) by relying on the temporary support frame body (1); removing the secondary beam (4) and the main beam (3) by relying on the temporary support frame body (1) in sequence; breaking the column wall; adjusting the top elevation of the temporary support frame body (1) according to the pre-determined new construction structure elevation; reinforcing the wall column (5) according to the function and quality of the new building structure; constructing the new main beam (3) and the secondary beam (4), the new floor (2); and removing the temporary support frame body (1). The support frame body integrated scheme solves the problems of setting up a relatively simple temporary support during demolition and setting up a frame support again during new construction. Meanwhile, the static expansion technology solves the problem of stripping the lap steel bars at the top of the column, and guarantees the construction quality and safety, saves the cost and period, shortens the period, and brings certain convenience to the construction site.

Description

Technical Field

[0001] This invention relates to the technical field of building floor structure renovation construction, and in particular to an integrated construction method for building structure demolition and new construction using a support frame. Background Technology

[0002] In building structural upgrade and renovation projects, situations often arise where the height difference between demolished and newly constructed floors changes, such as alterations to building function leading to lowering or raising floor elevations. To address the issue of erecting supporting scaffolding during demolition and then rebuilding it during construction, which wastes materials and increases costs and time, projects often resort to erecting rudimentary temporary supports during demolition to reduce costs and save time. However, this poses safety hazards and makes it difficult to guarantee construction quality. Furthermore, the rudimentary temporary supports must be dismantled and new scaffolding erected during construction, causing numerous inconveniences. Summary of the Invention

[0003] To address the problem of repetitive erection and dismantling of support frames in current demolition and new construction, this invention provides an integrated construction method for support frames used in building structure demolition and new construction.

[0004] The present invention provides an integrated construction method for building structure demolition and reconstruction support frames, which adopts the following technical solution:

[0005] A construction method for an integrated support frame for building structure demolition and reconstruction includes the following construction steps:

[0006] Step 1: Determine the height difference between the demolition and reconstruction of the building structure, and design and erect a temporary support frame based on the height difference between the demolition and reconstruction of the building structure;

[0007] Step 2: Remove the floor slabs using temporary support frames. The floor slabs will be removed by cutting them into sections and transporting them for dismantling.

[0008] Step 3: Using temporary support frames, dismantle the secondary beams and main beams in sequence;

[0009] Step 4: Break down the column wall and use static expansion technology to peel out the reinforcing steel bars inside the column wall;

[0010] Step 5: Adjust the top elevation of the temporary support frame according to the pre-determined elevation of the new structure;

[0011] Step Six: Carry out wall and column reinforcement construction according to the function and quality of the new building structure to ensure that the walls and columns meet the load-bearing capacity of the new building structure;

[0012] Step 7: Construction of new main beams, secondary beams, and new floor slabs;

[0013] Step 8: Dismantle the temporary support frame.

[0014] By adopting the above technical solutions and using an integrated support frame scheme, the problems of erecting simple temporary supports during demolition and having to rebuild the support frame during construction are solved. At the same time, the static expansion technology solves the problem of the lapped steel bars being peeled off at the top of the column. Construction quality and safety are guaranteed, while cost and construction time are saved and the construction period is shortened, bringing certain conveniences to the construction site.

[0015] Preferably, the specific construction steps of step one include:

[0016] Determine the design scheme for the new building, and design a single support frame based on the height difference between the demolished and newly built structures;

[0017] Using computers to calculate the load envelope for demolition and reconstruction of building structures;

[0018] Based on the design load of a single support frame and combined with the load envelope of building structure demolition and new construction, calculate the erection parameters of the support frame group.

[0019] The support frame group is designed and erected at the bottom of the building to be demolished and the new structure according to the erection parameters of the support frame group.

[0020] By adopting the above technical solution, the load envelope of demolition and construction is considered at the beginning of the project, ensuring that the integrated solution of demolition and construction of support frame can take into account the usage load under both conditions.

[0021] Preferably, the specific construction steps of step two include:

[0022] The maximum cutting area of ​​the beam and slab is calculated based on the on-site lifting capacity, lifting distance, and the dimensions required for transportation and loading.

[0023] After the temporary support frame is erected under the floor slab, secondary beams and main beams, the drilling, cutting and demolition work is carried out.

[0024] During demolition, holes are first drilled around the perimeter of the slab using a water drill, and then hoisting ropes are threaded through the holes and secured. Once the concrete slab is cut, it is then hoisted and transported.

[0025] By adopting the above technical solution, the maximum cutting area of ​​the beam and slab is calculated to avoid large-area simultaneous construction. After cutting, the weight of the floor slab is transferred to the next floor slab through the frame, which leads to insufficient load-bearing capacity of the next floor slab and easy cracking.

[0026] Preferably, step three includes the following specific construction steps:

[0027] The maximum cutting length of the beam is determined based on the on-site lifting capacity, lifting distance, and the dimensions required for transportation and loading.

[0028] First, the middle of the secondary beam and the main beam are cut off to form cantilever beams on both sides of the secondary beam and the main beam, and the bearing capacity of the bottom support frame of the cantilever beam is tested.

[0029] Then cut it into sections from the middle outwards.

[0030] By adopting the above technical solution, the secondary beams and main beams are cut off in the middle, effectively utilizing the supporting force of the building columns. At the same time, the beams are lifted from the most difficult parts to move, reducing the risk of accidents in the later stages of construction.

[0031] Preferably, step four includes the following specific construction steps:

[0032] First, the upper part of the concrete wall column is cut with a wire saw;

[0033] At a distance from the diameter of the top reinforcing bar of the newly built wall column, the reinforcing bar is peeled off using static expansion technology;

[0034] The cut-off wall columns were moved off the site.

[0035] By adopting the above technical solution, the static expansion technology is used to peel off the steel bars, which effectively reserves the lap length of the steel bars for the new part, which is conducive to the formation of a stable whole between the new building structure and the old building.

[0036] Preferably, the specific construction method of the static expansion technology includes:

[0037] Determination of static expansion holes;

[0038] Inject expansion agent;

[0039] Wait for the expanding agent to react fully;

[0040] The cracked concrete on site was cleaned up, and the reinforcing bars waiting to be spliced ​​were peeled off.

[0041] Preferably, step five includes the following specific construction steps:

[0042] Remove the clips used to secure the support frame;

[0043] Increase the height of the support frame to the predetermined height;

[0044] The support frame is fixedly connected using fasteners for installation;

[0045] The top of the support frame was finely adjusted to meet the installation requirements.

[0046] By adopting the above technical solution, the needs of new buildings can be met without demolition or reconstruction by increasing the height of the support frame to a predetermined height.

[0047] Preferably, step six includes the following specific construction steps:

[0048] Calculate the required load-bearing capacity of the walls and columns of the new building, and determine the required width and thickness of the walls and columns;

[0049] The process of widening the wall column with concrete includes reinforcing steel reinforcement and concrete pouring.

[0050] Steel plates are pasted on the outside of the wall columns for wrapping.

[0051] By adopting the above technical solutions, it is ensured that the functional requirements of the new building structure are met, and that the load-bearing capacity and safety of the walls and columns are satisfied during the transfer of loads from the slab, beam, column and wall structures.

[0052] Preferably, step seven includes the following specific construction steps:

[0053] Erect beam and slab formwork and side formwork on the support frame and fix them with tie bolts;

[0054] Reinforcing bars are tied inside the formwork and the concrete is poured.

[0055] After the pouring is completed, the beam and slab formwork and side formwork are removed;

[0056] The newly constructed beams, slabs and floor slabs are to be cured.

[0057] Preferably, step eight includes the following specific construction steps:

[0058] Test the hardness of newly constructed beams, slabs, and floor slabs;

[0059] The temporary support frame was dismantled sequentially from top to bottom;

[0060] The dismantled temporary support frame was then transported.

[0061] In summary, the present invention has the following beneficial technical effects:

[0062] 1. The integrated support frame solution solves the problem of erecting simple temporary supports during demolition and having to rebuild the support frame during construction. At the same time, the static expansion technology solves the problem of the lapped steel bars peeling off at the top of the column. Construction quality and safety are guaranteed, while cost and construction time are saved and the construction period is shortened, bringing certain convenience to the construction site.

[0063] 2. At the beginning of the project, the load envelope of demolition and construction should be considered simultaneously to ensure that the integrated solution of demolition and construction support frame can take into account the usage load under both conditions. The maximum cutting area of ​​beams and slabs should be calculated to avoid large-area construction at the same time. After cutting, the weight of the floor slab will be transferred to the floor slab below through the frame, which will lead to insufficient load-bearing capacity of the floor slab below and easy cracking. The secondary beams and main beams should be cut off in the middle to effectively utilize the supporting force of the building columns. At the same time, the lifting should be carried out from the most difficult part to reduce the occurrence of accidents in the later stage of construction.

[0064] 3. The static expansion technology effectively allows for the preservation of lap lengths for new steel reinforcement in the new construction, which helps the new building structure form a stable whole with the old building. By increasing the height of the support frame to the predetermined height, the new building can be constructed without demolition, thus meeting the needs of the new building. This ensures that the new building structure meets the functional requirements and that the load is transferred from the slab, beam, column and wall structure, ensuring the load-bearing capacity and safety of the walls and columns. Attached Figure Description

[0065] Figure 1 This is a flowchart of the construction steps of the present invention;

[0066] Figure 2 This is a top view schematic diagram of the floor slab demolition construction of the present invention;

[0067] Figure 3 This is a top view schematic diagram of the structural beam demolition construction of the present invention;

[0068] Figure 4 This is a schematic diagram of the temporary support structure during dismantling of the present invention.

[0069] Figure 5 This is a schematic diagram of the temporary support structure during the construction of the present invention.

[0070] 1. Temporary support frame; 2. Floor slab; 3. Main beam; 4. Secondary beam; 5. Wall column; 6. Horizontal bar; 7. Vertical bar; 8. Top support; 9. Clip.

[0071] Point A is the section of the concrete column / wall cut by the wire saw, and point B is the section of the concrete column / wall subjected to static expansion. Detailed Implementation

[0072] The following is in conjunction with the appendix Figure 1 The present invention will be described in further detail below.

[0073] Example 1:

[0074] This invention discloses an integrated construction method for building structure demolition and reconstruction support frames, referring to... Figure 1 The construction process includes the following steps:

[0075] Step 1: Determine the height difference between the demolition and reconstruction of the building structure, and design and erect a temporary support frame 1 based on the height difference between the demolition and reconstruction of the building structure;

[0076] Step 2: Using temporary support frame 1, dismantle floor slab 2. The dismantling of floor slab 2 is carried out by cutting it into sections and transporting them for dismantling.

[0077] Step 3: Using the temporary support frame 1, dismantle the secondary beam 4 and the main beam 3 in sequence;

[0078] Step 4: Break down the column wall and use static expansion technology to peel out the reinforcing steel bars inside the column wall;

[0079] Step 5: Adjust the top elevation of temporary support frame 1 according to the pre-determined elevation of the new structure;

[0080] Step Six: Reinforce wall column 5 according to the function and quality of the new building structure to ensure that wall column 5 meets the load-bearing capacity requirements of the new building structure;

[0081] Step 7: Construction of new main beam 3 and secondary beam 4, and new floor slab 2;

[0082] Step 8: Remove the temporary support frame 1.

[0083] Example 2:

[0084] The specific construction steps of step one include:

[0085] Determine the design scheme for the new building, and design a single support frame based on the height difference between the demolished and newly built structures;

[0086] Using computers to calculate the load envelope for demolition and reconstruction of building structures;

[0087] Based on the design load of a single support frame and combined with the load envelope of building structure demolition and new construction, calculate the erection parameters of the support frame group.

[0088] The support frame group is designed and erected at the bottom of the building to be demolished and the new structure according to the erection parameters of the support frame group.

[0089] The loads used generally include plastering, insulation boards, floor slab thickness, and support frame, as well as construction live loads. Finally, calculate the support frame under the beams and slabs, determine the erection spacing, and be careful not to make it too dense, so as to avoid difficulty in adjusting the elevation later.

[0090] The specific construction steps in step two include:

[0091] The maximum cutting area of ​​the beam and slab is calculated based on the on-site lifting capacity, lifting distance, and the dimensions required for transportation and loading.

[0092] After the temporary support frame 1 is erected under the floor slab 2, secondary beam 4 and main beam 3, the drilling, cutting and dismantling work is carried out.

[0093] During demolition, holes are first drilled around the perimeter of the slab using a water drill, and then hoisting ropes are threaded through the holes and secured. Once the concrete slab is cut, it is then hoisted and transported.

[0094] The demolition sequence should be carried out by dividing the work into sections, cutting and hoisting in a timely manner, and stacking carefully.

[0095] The specific construction steps in step three include:

[0096] The maximum cutting length of the beam is determined based on the on-site lifting capacity, lifting distance, and the dimensions required for transportation and loading.

[0097] First, the middle of the secondary beam 4 and the main beam 3 are cut off, and cantilever beams are formed on both sides of the secondary beam 4 and the main beam 3. The load-bearing capacity of the bottom support frame of the cantilever beam is then tested.

[0098] Then cut it into sections from the middle outwards.

[0099] Before cutting, ensure that the temporary supports under the beam are safe and reliable. The cutting sequence should be secondary beam 4 first, then main beam 3.

[0100] The specific construction steps in step four include:

[0101] First, the upper part of the concrete wall column 5 is cut with a wire saw.

[0102] At a distance of 5 diameters from the top of the newly built wall column, the steel bars are peeled off using static expansion technology;

[0103] The cut-off wall column 5 was moved away from the site.

[0104] The specific construction method of the static expansion technology includes:

[0105] Determination of static expansion holes;

[0106] Inject expansion agent;

[0107] Wait for the expanding agent to react fully;

[0108] The cracked concrete on site was cleaned up, and the reinforcing bars waiting to be spliced ​​were peeled off.

[0109] The specific construction steps in step five include:

[0110] Remove the fixing clips 9 from the temporary support frame 1;

[0111] Add temporary support frame 1 to the predetermined height;

[0112] When increasing the height of the temporary support frame 1, lengthen the uprights 7 and then increase the number of horizontal bars;

[0113] The support frame is fixedly connected using the mounting clips 9;

[0114] The top of the temporary support frame 1 was finely adjusted to meet the installation requirements;

[0115] The fine adjustment of the temporary support frame 1 is achieved by rotating the top support 8 screw thread.

[0116] The specific construction steps in step six include:

[0117] Calculate the required bearing capacity of wall column 5 in the new building, and verify the required width and thickness of wall column 5;

[0118] The concrete widening of wall column 5 includes steel reinforcement binding and concrete pouring;

[0119] A steel plate was attached to the outside of the wall column 5 for wrapping.

[0120] The specific construction steps in step seven include:

[0121] Erect beam and slab formwork and side formwork on the support frame and fix them with tie bolts;

[0122] Reinforcing bars are tied inside the formwork and the concrete is poured.

[0123] After the pouring is completed, the beam and slab formwork and side formwork are removed;

[0124] The newly built beams and floor slabs 2 are to be cured.

[0125] The specific construction steps in step eight include:

[0126] Test the hardness of newly constructed beams and floor slabs;

[0127] Dismantle temporary support frame 1 from top to bottom;

[0128] The dismantled temporary support frame 1 was transported.

[0129] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A construction method integrating building structure demolition and reconstruction support frame, characterized in that: The construction steps include the following: Step 1: Determine the height difference between the demolition and reconstruction of the building structure, and design and erect a temporary support frame based on the height difference between the demolition and reconstruction of the building structure (1). Step 2: Using temporary support frame (1), remove floor slab (2). The removal of floor slab (2) is carried out by cutting it into sections and transporting them for removal. Step 3: Using the temporary support frame (1), dismantle the secondary beam (4) and the main beam (3) in sequence; Step 4: Break down the column wall and use static expansion technology to peel out the reinforcing steel bars inside the column wall; Step 5: Adjust the top elevation of the temporary support frame (1) according to the pre-determined elevation of the new structure; Step 6: Reinforce the wall columns (5) according to the function and quality of the new building structure, so that the wall columns (5) meet the bearing capacity of the new building structure; Step 7: Construction of new main beams (3) and secondary beams (4), and new floor slabs (2); Step 8: Dismantle the temporary support frame (1); The specific construction steps of step one include: Determine the design scheme for the new building, and design a single support frame based on the height difference between the demolished and newly built structures; Using computers to calculate the load envelope for demolition and reconstruction of building structures; Based on the design load of a single support frame and combined with the load envelope of building structure demolition and new construction, calculate the erection parameters of the support frame group. Design and erect support frame groups at the bottom of the building to be demolished and the new structure according to the erection parameters of the support frame group; The specific construction steps in step two include: The maximum cutting area of ​​the beam and slab is calculated based on the on-site lifting capacity, lifting distance, and the dimensions required for transportation and loading. After the temporary support frame (1) is erected under the floor slab (2), secondary beam (4) and main beam (3), the drilling, cutting and dismantling work is carried out; During demolition, first use a water drill to make holes around the demolition panel, then use a hoisting rope to pass through the holes and tie it securely. After the concrete of the panel is cut, it will be hoisted and transported. The specific construction steps in step three include: The maximum cutting length of the beam is determined based on the on-site lifting capacity, lifting distance, and the dimensions required for transportation and loading. First, the middle part of the secondary beam (4) and the main beam (3) is cut off, and cantilever beams are formed on both sides of the secondary beam (4) and the main beam (3). The bearing capacity of the bottom support frame of the cantilever beam is then tested. Then cut it into sections from the middle outwards; The specific construction steps in step four include: First, the upper part of the concrete wall column (5) is cut with a wire saw; At a distance from the top of the newly built wall column (5) with a diameter of the reinforcing bar, the reinforcing bar is peeled off using static expansion technology; The cut-off wall column (5) was moved away from the site; The specific construction method of the static expansion technology includes: Determination of static expansion holes; Inject expansion agent; Wait for the expanding agent to react fully; The cracked concrete on site was cleaned up, and the reinforcing bars waiting to be spliced ​​were peeled off.

2. The integrated construction method for building structure demolition and reconstruction support frame as described in claim 1, characterized in that: The specific construction steps in step five include: Remove the fixing clips (9) in the support frame; Increase the height of the support frame to the predetermined height; The support frame is fixedly connected by the mounting clips (9); The top of the support frame was finely adjusted to meet the installation requirements.

3. The integrated construction method for building structure demolition and reconstruction support frame as described in claim 1, characterized in that: The specific construction steps in step six include: Calculate the required bearing capacity of the wall column (5) of the new building and calculate the required thickness of the wall column (5); The concrete widening of the wall column (5) includes steel reinforcement binding and concrete pouring; A steel plate is pasted on the outside of the wall column (5) for wrapping.

4. The integrated construction method for building structure demolition and reconstruction support frame as described in claim 1, characterized in that: The specific construction steps in step seven include: Erect beam and slab formwork and side formwork on the support frame and fix them with tie bolts; Reinforcing bars are tied inside the formwork and then the concrete is poured. After the pouring is completed, the beam and slab formwork and side formwork are removed; The newly built beams and floor slabs (2) are cured.

5. The integrated construction method for building structure demolition and reconstruction support frame as described in claim 1, characterized in that: The specific construction steps in step eight include: Test the hardness of newly built beams, slabs and floor slabs (2); Dismantle the temporary support frame from top to bottom (1); The dismantled temporary support frame (1) was transported.

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