CN114961335A - Demolition construction method for large-span reinforced concrete supporting beam - Google Patents
Demolition construction method for large-span reinforced concrete supporting beam Download PDFInfo
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Abstract
The application relates to the technical field of building construction, in particular to a demolition construction method of a large-span reinforced concrete supporting beam, wherein a two-layer basement is arranged in a foundation pit, a plurality of areas are divided in the foundation pit, and a supporting system is arranged at the corner of each area, and the demolition construction method comprises the following construction steps: determining a cutting mode; designing the range of the construction section to be dismantled according to the stress interval; performing support replacement work before support removal; erecting a channel steel stirrup; positioning and paying off; cutting the support beam in sections; transferring the segmented support beams; demolish channel-section steel stirrup, in order to improve the construction safety and the efficiency of construction of demolising a supporting beam, this application provides a construction method demolishs of large-span reinforced concrete supporting beam.
Description
Technical Field
The application relates to the technical field of building construction, in particular to a dismantling construction method of a large-span reinforced concrete supporting beam.
Background
Along with the continuous deep development of building engineering, underground space has also obtained more abundant utilization, to being provided with the large-scale building of multilayer basement, inside is provided with large-span reinforced concrete supporting beam, and basement excavation and bottom plate construction are accomplished the back, need do the foundation ditch and prop back concrete slabs system to demolish various supporting beams on bottom plate upper portion.
At present, a concrete supporting beam generally adopts a steel pipe scaffold erected at the bottom of the concrete supporting beam, and then is dismantled by adopting methods such as mechanical chiseling or static blasting, the construction method has a large engineering quantity and a long construction period, manpower and material resources are wasted, and in the dismantling period, the deformation of a foundation pit supporting system is directly influenced by the redistribution of internal force between an inner support, a supporting row pile and a basement structure, so that the stability of peripheral buildings and pipelines is influenced, the danger coefficient of manual dismantling is large, the operation difficulty is large, and the requirements of construction safety and construction quality are difficult to meet by adopting a manual operation mode.
Disclosure of Invention
In order to improve the construction safety and the construction efficiency of the dismantling support beam, the application provides a dismantling construction method of a large-span reinforced concrete support beam.
The application provides a demolition construction method of a large-span reinforced concrete supporting beam, which adopts the following technical scheme:
a demolition construction method for a large-span reinforced concrete supporting beam is characterized in that a two-layer basement is arranged in a foundation pit, the foundation pit is divided into a plurality of areas, and supporting systems are arranged at the corners of the areas.
The method comprises the following construction steps:
the method comprises the following steps: determining a cutting mode: determining the cutting mode of the large-span support beam.
Step two: designing the range of dismantling the construction section according to the stress interval: and calculating the load of the temporary channel steel stirrup and the negative two-layer top plate of the basement, and calculating the workload of dismantling the support system.
Step three: the support replacement work is carried out before the support is disassembled: after the construction of the bottom plate is completed, the foundation pit is firstly subjected to outer waterproofing and backfilling, a first back-supporting concrete slab is arranged at the edge of the bottom plate and the foundation pit, a second-layer concrete support is removed, a second back-supporting concrete slab is arranged at the position of the basement bearing the second-layer floor and the edge of the foundation pit, and the first-layer concrete support is removed.
Step four: and (3) erecting a channel steel stirrup: and (5) setting up a temporary channel steel tying stirrup.
Step five: positioning and paying off: the supporting system carries out positioning and paying-off.
Step six: cutting the support beam in sections: and carrying out sectional cutting on the support beam by using a static rope saw to obtain a plurality of sectional support beams.
Step seven: transporting a sectional support beam: and hoisting the corresponding segmented supporting beam away from the foundation pit by using a crane and a forklift.
Step eight: dismantling a channel steel stirrup: and dismantling the channel steel stirrup, and loading and transporting away from the foundation pit.
Through adopting above-mentioned technical scheme, the large-span supporting beam adopts the channel-section steel stirrup to carry out interim support, adopt static rope saw to cut and demolish, cut according to reasonable segmentation point, obtain the multistage, small segmentation supporting beam, so that subsequent transportation, crane and fork truck are reconciled and the handling is carried out and is left foundation ditch and job site, the work of demolising of large-span excavation supporting system that can adapt to various environment effectively, cut the large-span supporting beam through static rope saw, can reduce traditional static blasting demolishs and the artifical excavation collapse phenomenon that brings, the long problem of engineering time, play and improve the effect of demolising construction speed, be favorable to reducing the use amount of manpower and materials, resources are saved, and to peripheral building, the influence of all ring edge borders is little, accord with construction quality, safe requirement.
Preferably, the supporting system includes a supporting mechanism, and in the step of processing the stirrup for setting up the channel steel in the fourth step, at least one layer of the supporting mechanism is reserved on the lower parts of the first layer of concrete support and the second layer of concrete support when the first layer of concrete support and the second layer of concrete support are removed.
Through adopting above-mentioned technical scheme, reserve through the lower part at first layer concrete support, second floor concrete support and prop and hold the mechanism, play the effect of interim support, reduce and appear the phenomenon of collapsing when quiet power rope saw cuts first layer concrete support, second floor concrete support, be favorable to guaranteeing operation safety.
Preferably, in the processing step of cutting the support beam by sections in the sixth step, the channel steel stirrup is placed at the bottom of the support beam, and a gap pad is arranged between the channel steel stirrup and the support beam.
Through adopting above-mentioned technical scheme, the setting up of gap backing plate can play the effect of caulking, making level, has improved the assembly stability between channel-section steel stirrup and the supporting beam for channel-section steel stirrup can bear the load that a supporting beam brought better, is favorable to guaranteeing the operation security.
Preferably, in the step six of machining the section cutting support beam, at least two channel stirrups are placed at the bottom of each section support beam according to the section cutting length, and the static rope sawing machine cuts the support beam sequentially: and firstly cutting off the two sides of the supporting beam, then cutting off the middle part of the supporting beam, and forming a cutting gap between every two adjacent sectional supporting beams.
Through adopting above-mentioned technical scheme, quiet power rope saw divides a supporting beam into two, realize cuting of large-span supporting beam, make large-span supporting beam can decompose into multistage segmentation supporting beam, make things convenient for subsequent handling of staff on the one hand, the transportation work, accelerate the transportation efficiency of demolising the construction, on the other hand, through cuting a supporting beam, easily operation personnel control operation flow, improve the operation security, furthermore, the middle part is cut again through the both sides of cutting a supporting beam earlier, be favorable to making segmentation supporting beam atress balanced, also be convenient for fork truck upwards lift crane or segmentation supporting beam, the dead safety problem of card appears when reducing quiet power rope saw cutting a supporting beam, the operation security has been improved.
Preferably, the cutting slit is a bevel edge slit which is inclined from the bottom to the top and from the center of the support beam to the outside.
By adopting the technical scheme, the cutting gap is the inclined side gap which is inclined outwards from the center of the supporting beam from bottom to top, so that the static rope sawing machine can easily cut off the supporting beam or separate from the supporting beam, the safety problem of blocking when the static rope sawing machine cuts the supporting beam is reduced, and the operation safety is improved.
Preferably, the support system comprises a wale, and in the processing step of performing support replacement before support dismantling in the third step, the connecting part of the support beam and the wale is separated firstly, then the support beam is dismantled, and finally the wale is dismantled.
Through adopting above-mentioned technical scheme, the waist rail plays the effect that increases structural integrity and antidetonation in the building, and supporting beam plays the bearing effect, through the connecting portion of separating supporting beam and waist rail earlier, demolish supporting beam, demolish the waist rail at last, accord with the mechanics and decompose the principle, reduce and demolish the phenomenon of collapsing appearing in the process, improve the operation security.
Preferably, the support system comprises a sealing plate, a connecting beam and a ring supporting beam, and the dismantling sequence is as follows: firstly, removing the sealing plate, removing the connecting beam, removing the ring supporting beam and finally removing the waist beam.
Through adopting above-mentioned technical scheme, demolish the shrouding earlier, demolish the connection roof beam, demolish the ring beam, demolish the waist rail at last, accord with the mechanics and decompose the principle, reduce and demolish the phenomenon of collapsing in the process appearance, improve the operation security.
Preferably, the support system further includes a corner brace beam, the corner brace beam is disposed at a corner of the foundation pit, and the dismantling sequence is as follows: cutting off the end part of the angle supporting beam and the waist beam, dismantling the connecting beam, the supporting beam and finally the waist beam, wherein the dismantling mode is as follows: the long side is dismantled to the short side, the middle is dismantled to both sides, outside-in direction in proper order.
Through adopting above-mentioned technical scheme, through adopting the order of demolising and the mode of demolising of this application, accord with mechanics decomposition principle, reduce the change of foundation ditch supporting construction internal force, reduce supporting construction and produce too big stress and warp, guarantee to tear open the homogeneity of propping in-process stress release, improve the operation security.
Preferably, a slag outlet is formed in the position, close to the foundation pit, of the area.
Through adopting above-mentioned technical scheme, produced dregs rubble behind the quiet power rope saw cutting supporting beam leaves the foundation ditch through the loading to the dregs rubble transports along the slag notch to be convenient for the subsequent centralized processing of dregs rubble.
Preferably, the support system comprises a steel lattice column, in the processing step of replacing the support before the support is disassembled in the third step, a hoisting space is reserved between the steel lattice column and the bottom plate or between the steel lattice column and the negative second-floor slab of the basement, and the steel lattice column is disassembled in sections according to the floor.
Through adopting above-mentioned technical scheme, through reserving the handling space between steel lattice column and bottom plate, or between steel lattice column and the basement burden second floor board to installation and subsequent crane handling work of crane are demolishd according to the layer segmentation to steel lattice column, with the lifting capacity of adaptation crane, improve the convenience of transporting steel lattice column.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the large-span supporting beam is temporarily supported by a channel steel stirrup, is cut and dismantled by a static rope saw, is cut according to reasonable sectional points to obtain a plurality of sections of small-sized sectional supporting beams, so that subsequent transportation is facilitated, and is hoisted away from a foundation pit and a construction site by matching with a crane and a forklift, so that the large-span foundation pit supporting system dismantling work of various environments can be effectively adapted;
2. the arrangement of the gap base plate can play roles of joint filling and leveling, the assembly stability between the channel steel stirrup and the supporting beam is improved, the channel steel stirrup can better bear the load brought by the supporting beam, and the operation safety can be ensured;
3. through adopting the order of demolising and the mode of demolising of this application, accord with mechanics decomposition principle, reduce the change of foundation ditch supporting construction internal force, reduce supporting construction and produce too big stress and warp, guarantee to tear open the homogeneity of propping in-process stress release, improve the operation security.
Drawings
FIG. 1 is a process flow diagram of a large-span support beam demolition construction in an embodiment of the present application.
FIG. 2 is a plan view of an embodiment of the present invention.
Fig. 3 is a floor plan of a foundation pit in the embodiment of the present application.
Fig. 4 is an elevation view of a bracing-replacing system bracing-returning concrete slab in the embodiment of the application.
Fig. 5 is a schematic view of a floor back-jacking bracket in a forklift walking area in the embodiment of the application.
Fig. 6 is a schematic structural diagram of a channel stirrup in an embodiment of the present application.
Fig. 7 is a schematic diagram of the installation of a channel stirrup in the embodiment of the application.
FIG. 8 is a schematic detail cutting view in the embodiment of the present application.
Fig. 9 is a schematic diagram of a reserved forklift walking area in the embodiment of the application.
FIG. 10 is a schematic view of the location of a suspension point in an embodiment of the present application.
Description of reference numerals: 1. a foundation pit; 10. wide top protection; 11. supporting piles; 12. a waterproof curtain of the triaxial cement mixing pile; 121. reinforcing a passive area of the triaxial cement mixing pile; 13. stirring the slope toe of the pile with cement; 14. releasing slope and spraying concrete to hang a net; 15. the top of the cement mixing pile slope; 16. releasing a slope and spraying a concrete surface; 17. a slope platform is set; 18. double-pipe rotary jet grouting piles; 19. a reinforcing plate; 2. using a red ground line; 31. a steel lattice column; 32. a wale; 33. a support beam; 4. a base plate; 5. a floor slab is arranged on the basement; 51. backfilling stone powder; 61. a channel steel stirrup; 62. back supporting the bracket; 71. cutting a gap; 72. a gap backing plate; 81. a transport zone; 82. a travelling crane passage; 83. a unearthed lane; 84. a slag outlet; 91. a first concrete slab for supporting; 92. a second back-bracing concrete slab; 93. a first support beam; 94. and a second support beam.
Detailed Description
The present application is described in further detail below with reference to figures 1-10.
The embodiment of the application discloses a dismantling construction method of a large-span reinforced concrete supporting beam.
Referring to fig. 1 and 2, a construction method for dismantling a large-span reinforced concrete supporting beam is provided, wherein a two-layer basement is arranged in a foundation pit 1 from top to bottom, the foundation pit 1 comprises four regions which are respectively designed at four corners of the foundation pit 1, the four regions are divided into an area A, an area B, an area C and an area D according to an anticlockwise support dismantling sequence, the four regions are simultaneously constructed, the flow line work is performed to accelerate the construction rhythm, supporting systems are arranged at the corners of the four regions and the intersection positions of the four regions, and the internal structure of the foundation pit 1 is stable and is not easy to collapse.
In the embodiment of the present application, the support system is a foundation pit support installed inside the foundation pit 1, and the support system mainly includes: two-layer basement structure support and upright post structure support, referring to fig. 3 and 4, the two-layer basement adopts the structure support of the balance weight type row pile and the large-span inner support, the upright post adopts the structure support of the lower concrete upright post pile and the steel lattice column 31, wherein, the balance weight type row pile comprises a plurality of support piles 11, a plurality of support piles 11 are distributed on the periphery of the foundation pit 1 side by side, the large-span inner support comprises a closing plate, a waist beam 32, a ring support beam, a support beam 33, a pair support beam, a angle support beam, a waist beam 32 and a connecting beam, because the assembly relationship between the closing plate, the waist beam 32, the ring support beam, the support beam 33, the pair support beam, the angle support beam, the waist beam 32 and the connecting beam is the prior art, detailed description is not provided in the embodiment of the application, and the steel lattice column 31 is arranged at the position where two adjacent waist beams 32 are staggered, so that the steel lattice column 31 and the waist beam 32 are arranged vertically, plays a role in further enhancing the stability.
The dismantling construction steps of the large-span reinforced concrete supporting beam are as follows:
the method comprises the following steps: determining a cutting mode: a large-span reinforced concrete supporting beam channel steel stirrup 61 is adopted for supporting, and a static force rope saw is adopted for cutting and dismantling.
Step two: the construction method comprises the steps of designing the range of a demolition construction section according to a stress interval, calculating the loads of a temporary channel steel stirrup 61 and a negative two-layer top plate of a basement, calculating the demolition workload of a supporting system, calculating the demolition safety factor of a large-span support, the settlement of surrounding buildings and the construction speed, monitoring the surrounding environment of construction, drawing a land red line 2 for foundation pit 1 construction according to the geological investigation condition, and ensuring the effectiveness and the safety of demolition construction of the supporting system.
Step three: the support replacement work is carried out before the support is disassembled: after the construction of bottom plate 4 is accomplished, do outer waterproof and backfill to foundation ditch 1 earlier, specifically, backfill the fertile groove of basement, set up triaxial cement mixing pile waterproof curtain 12 in foundation ditch 1 near the outside of weighing type row pile to improve the stability of foundation ditch 1 side slope, impervious performance, and then reach the effect of stagnant water retaining soil, establish in the outside of triaxial cement mixing pile waterproof curtain 12 and put the slope and spout concrete face 16, further strengthen the steadiness of foundation ditch 1 lateral wall, strengthen waterproof effect, and, set up 1 m's wide fender top 10 in foundation ditch 1 near putting the slope and spout the outside of concrete face 16, in order to reduce the condition that the top surface of foundation ditch 1 appears collapsing.
In order to improve the convenience that the goods and materials transported in the work progress, in this application embodiment, one side of foundation ditch 1 sets up the district 81 of transporting, and there is main unearthed lane 83 one side of the district 81 of transporting, and foundation ditch 1 is provided with wide 5 m's slope platform 17 near the output end department on main unearthed lane 83, is favorable to improving the convenience of construction stage goods and materials turnover for the construction rhythm.
In the embodiment of the present application, the corner of the transfer area 81 is provided with the reinforcing plate 19 and the double-pipe jet grouting piles 18 to enhance the structural strength of the corner of the transfer area 81 and achieve the effect of water-stopping and soil-retaining.
A cement mixing pile slope foot 13, a slope-releasing concrete-spraying hanging net 14 and a cement mixing pile slope top 15 are arranged at one corner of the area A of the foundation pit 1, so that the structural stability of the foundation pit 1 is further enhanced, the large-span support dismantling safety factor is improved, the deformation of the foundation pit 1 in the construction process is reduced, the influence on the surrounding environment is reduced, and the effectiveness and the safety of the support system dismantling construction are ensured.
Referring to fig. 4 and 5, a first concrete slab 91 with a thickness of 600mm is constructed at the position of the bottom plate 4 and the edge of the foundation pit 1, the first concrete slab 91 is a C30 concrete slab, after the first concrete slab 91 is cured to a designed strength, namely, the test value of the compressive strength of the first concrete slabs 91 reaches 100% of the design strength of C30 concrete, the second layer of concrete support is removed, then, the construction is continued upwards to the basement negative second floor, a second back-supporting concrete slab 92 with the thickness of 300mm is constructed at the position of the basement negative second floor and the side of the foundation pit 1, the second back-supporting concrete slab 92 is also a back-supporting C30 concrete slab, after the second back-supporting concrete slab 92 is cured to the designed strength, namely, the test value of the compressive strength of the second back-supporting concrete plate 92 reaches 100 percent of the design strength of C30 concrete, the first layer of concrete support is removed, the first layer of concrete support and the second layer of concrete support are support systems arranged on different basement floors.
And, the bottom of the bottom plate 4 is provided with a passive area reinforcement 121 of a triaxial cement mixing pile, the passive area reinforcement 121 of the triaxial cement mixing pile is arranged in parallel with the bottom end of the supporting pile 11, backfill stone powder 51 is arranged between the bottom plate 4 and the floor 5 of the basement, so that the backfill stone powder 51 is filled on the top surface of the whole bottom plate 4, a hoisting space of 5m is reserved between the steel lattice column 31 and the bottom plate 4 or between the steel lattice column 31 and the floor 5 of the basement, in order to improve the dismantling convenience of the steel lattice column 31, the steel lattice column 31 is dismantled in sections, each layer of the steel lattice column 31 is divided into one section, each layer is dismantled in sections as an independent small section, after the cutting is finished, a crane or a tower crane is transported to the hoisting point position at the edge of the foundation pit 1 nearby, and the foundation pit 1 is hoisted out from a tower crane outlet 84 (refer to fig. 9) for transporting the foundation pit 1 outside.
In addition, in the embodiment of the application, the dismantling sequence of each area is dismantled by adopting a hop method so as to ensure the uniformity of stress release in the dismantling process, the axial force value of the rest supporting beams 33 and the deformation value of the road around the foundation pit 1 are concerned at any moment in the dismantling process of each area supporting beam 33, a third-party monitoring unit forms a monitoring daily report on the monitoring result, and when the axial force value exceeds a given limit value or the monitoring deformation is too large, the dismantling and the support are stopped immediately, and an emergency plan is started.
Specifically, the dismantling sequence of the large-span inner support is as follows:
the connecting part of the support beam 33 and the wale 32 is separated, then the support beam 33 is disassembled, and finally the wale 32 is disassembled.
The closing plate, the connecting beam, the ring supporting beam and the waist beam 32 are removed firstly.
Cutting off the end part of the angle beam and the wale 32, dismantling the connecting beam, dismantling the supporting beam 33 and finally dismantling the wale 32.
According to the actual situation of a construction site, the dismounting mode of the large-span inner support is as follows: the long edge is removed to the short edge, the middle is removed to the two edges and the direction from outside to inside in sequence, so that the support is not easy to generate overlarge stress release after the support is removed, and the safety of the foundation pit 1 and the surrounding environment is protected.
Step four: and (3) erecting a channel steel stirrup 61: a temporary tie channel stirrup 61 is set up.
Referring to fig. 4 and 6, in the embodiment of the present application, the supporting system includes a supporting mechanism, the supporting mechanism includes a channel steel stirrup 61 and a back-to-top support 62, when a first layer of concrete support and a second layer of concrete support are removed, at least one layer of supporting mechanism is reserved on the lower portions of the first layer of concrete support and the second layer of concrete support respectively, a second supporting beam 94 is arranged between the bottom plate 4 and the negative layer of floor 5 of the basement, and a first supporting beam 93 is arranged on the top of the negative layer of floor 5 of the basement, so that the bottom surface of the first supporting beam 93 is 1.6m away from the underlying structure, and the bottom surface of the second supporting beam 94 is 2.3m away from the underlying structure, thereby ensuring that there is a sufficient construction space.
Channel-section steel stirrup 61 is formed by entablature, middle cross beam, bottom end rail, longeron and the welding of both sides eight characters stand, and the height of setting up of each roof beam of channel-section steel stirrup 61 is confirmed according to actual construction conditions.
Step five: positioning and paying off: the supporting system carries out positioning and paying-off so as to improve the operation convenience and the operation progress.
Step six: the segmental cutting support beam 33: the support beam 33 is cut in sections by a static rope saw to obtain a plurality of sectional support beams.
Referring to fig. 7 and 8, according to the length of supporting beam 33 segmentation cutting, two channel-section stirrups 61 are placed at least to every segmentation supporting beam's bottom, it is 200mm ~ 300mm to place apart from cutting position edge, be provided with gap backing plate 72 between channel-section stirrup 61 and the supporting beam 33, gap backing plate 72 is rectangular for the flitch, gap backing plate 72 can play the effect of caulking, make level, the assembly stability between channel-section stirrup 61 and the supporting beam 33 has been improved, make channel-section stirrup 61 can better bear the load that supporting beam 33 brought, be favorable to guaranteeing the operation security.
In this application embodiment, quiet power rope saw adopts diamond chain saw, and the operation personnel make diamond rope under high-speed motion, divide a supporting beam 33 into two through starting quiet power rope saw, in the cutting process, open the water pipe, make the water source aim at the cutting position to play the effect of cooling, suppressing dirt, and, refer to fig. 7 and 8, quiet power rope saw cuts a supporting beam 33 order: the two sides of the supporting beam 33 are cut off firstly, then the middle part of the supporting beam 33 is cut off, and a cutting gap 71 is formed between two adjacent supporting beams, so that the cutting gap 71 is a bevel edge gap which is inclined outwards from the center of the supporting beam 33 from bottom to top, the phenomenon of jamming when a forklift lifts upwards and an automobile is directly hoisted is reduced, and the operation safety is improved.
Step seven: transferring the segmented support beam: and hoisting and transporting the corresponding sectional supporting beam away from the foundation pit 1 by adopting a crane and a forklift.
Referring to fig. 9 and 10, according to the bearing capacity of the floor and the horizontal space in the region of the foundation pit 1, the traveling route of the forklift and the installation position of the crane are planned, a traveling passage 82 with the width of 8m is reserved on one side of the region close to the corner of the foundation pit 1, wherein the traveling passages 82 in the B region and the C region are used for transporting supporting beam fragments, the traveling passages 82 in the A region and the B region are used for transporting non-supporting beam fragments, and concrete fragment slag outlets 84 are arranged on small passages at the corners of the region so as to be convenient for transporting small fragments and slag.
In the process of walking of the forklift on the regional floor, the supporting mechanism at the bottom of the supporting beam 33 is not detached, so that the stability of the operation of the foundation pit 1 is ensured.
Referring to fig. 9 and 10, five lifting points are arranged in four areas, in the embodiment of the application, the distance between the center of each lifting point and the side line of the foundation pit 1 is 2m, a first lifting point is arranged in an area a, a second lifting point is arranged in an area B, a third lifting point and a fourth lifting point are arranged in an area C, a fifth lifting point is arranged in an area D, supporting beams 33 in the areas are transported out of the foundation pit 1 from the lifting points according to the principle of proximity and are transported out of a construction entrance and exit nearby, and the four areas are simultaneously constructed, are operated in a flow mode, and are accelerated in construction rhythm.
Step eight: removing the channel stirrup 61: and (5) dismantling the channel steel stirrup 61, and loading and transporting away from the foundation pit 1.
The above are all the preferred embodiments of the present application, and this embodiment is only for explaining the present application, and does not limit the protection scope of the present application accordingly, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (10)
1. A demolition construction method for a large-span reinforced concrete support beam is characterized in that a two-layer basement is arranged in a foundation pit (1), the interior of the foundation pit (1) is divided into a plurality of areas, and a support system is arranged at the corner of each area;
the method comprises the following construction steps:
the method comprises the following steps: determining a cutting mode: determining a cutting mode of the large-span support beam (33);
step two: designing the range of dismantling the construction section according to the stress interval: calculating the loads of a temporary channel steel stirrup (61) and a negative second-layer top plate of the basement, and calculating the workload of dismantling the supporting system;
step three: the support replacement work is carried out before the support is disassembled: after the construction of the bottom plate (4) is finished, firstly, performing external waterproofing and backfilling on the foundation pit (1), installing a first back-supporting concrete plate (91) at the edge of the bottom plate (4) and the foundation pit (1), dismantling a second layer of concrete support, then installing a second back-supporting concrete plate (92) at the position of the basement bearing the second layer of floor and at the edge of the foundation pit (1), and dismantling the first layer of concrete support;
step four: erection channel stirrup (61): setting up a temporary tie channel stirrup (61);
step five: positioning and paying off: positioning and paying off the support system;
step six: segmented cutting support beam (33): the supporting beam (33) is cut in sections through a static rope saw machine to obtain a plurality of sectional supporting beams;
step seven: transferring the segmented support beam: hoisting the corresponding segmented support beams away from the foundation pit (1) by using a crane and a forklift;
step eight: removing a channel stirrup (61): and (3) dismantling the channel steel stirrup (61), and loading and transporting away from the foundation pit (1).
2. A demolition construction method for a large-span reinforced concrete support beam according to claim 1, characterized in that the support system includes a supporting mechanism, and in the step four of building channel stirrup (61), at least one layer of the supporting mechanism is reserved on the lower part of the first layer of concrete support and the lower part of the second layer of concrete support when the first layer of concrete support and the second layer of concrete support are demolished.
3. The demolition construction method for a large-span reinforced concrete support beam according to claim 1, wherein in the processing step of the section cutting support beam (33) of the sixth step, the channel stirrup (61) is placed at the bottom of the support beam (33), and a gap pad (72) is provided between the channel stirrup (61) and the support beam (33).
4. The demolition construction method for a large-span reinforced concrete support beam according to claim 1, characterized in that in the processing step of the sectional cutting support beam (33) of the sixth step, at least two channel stirrups (61) are placed at the bottom of each sectional support beam according to the sectional cutting length, and the static rope saw cuts the support beam (33) sequentially: firstly cutting off two sides of the supporting beam (33), then cutting off the middle part of the supporting beam (33), and forming a cutting gap (71) between two adjacent subsection supporting beams.
5. The demolition construction method for a large-span reinforced concrete support beam according to claim 4, wherein the cutting slit (71) is a bevel slit inclined from the center of the support beam (33) outward from the bottom to the top.
6. The demolition construction method of a large-span reinforced concrete support beam according to claim 1, wherein the support system includes a wale (32), and in the processing step of performing the bracing change work before the bracing removal in the third step, the connection part of the support beam (33) and the wale (32) is separated, then the support beam (33) is demolished, and finally the wale (32) is demolished.
7. A dismantling construction method for a large-span reinforced concrete supporting beam as claimed in claim 6, wherein the supporting system comprises a closing plate, a connecting beam and a ring supporting beam, and the dismantling sequence is as follows: the closing plates are firstly dismantled, the connecting beams are dismantled, the ring supporting beams are dismantled, and finally the waist beam (32) is dismantled.
8. A demolition construction method for a large-span reinforced concrete support beam according to claim 7, characterized in that the support system further comprises angle brace beams, the angle brace beams are arranged at the corners of the foundation pit (1), and the demolition sequence is as follows: cutting off the end part of the angle supporting beam and the waist beam (32), dismantling the connecting beam, the supporting beam (33) and finally the waist beam (32), wherein the dismantling mode is as follows: the long side is dismantled to the short side, the middle is dismantled to both sides, outside-in direction in proper order.
9. The demolition construction method for a large-span reinforced concrete support beam as recited in claim 1, wherein a slag outlet (84) is opened at a position of the area close to the foundation pit (1).
10. The demolition construction method of a large-span reinforced concrete support beam as claimed in claim 1, wherein the support system comprises a steel lattice column (31), in the processing step of performing bracing change work before the bracing demolition in the third step, a hoisting space is reserved between the steel lattice column (31) and the bottom plate (4), or between the steel lattice column (31) and the basement negative second floor, and the steel lattice column (31) is demolished by sections according to layers.
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