CN114961335B - Demolition construction method for large-span reinforced concrete support beam - Google Patents
Demolition construction method for large-span reinforced concrete support beam Download PDFInfo
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- CN114961335B CN114961335B CN202210721831.2A CN202210721831A CN114961335B CN 114961335 B CN114961335 B CN 114961335B CN 202210721831 A CN202210721831 A CN 202210721831A CN 114961335 B CN114961335 B CN 114961335B
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- E—FIXED CONSTRUCTIONS
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Abstract
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, a two-layer basement is arranged in a foundation pit, a plurality of areas are arranged in the foundation pit, and supporting systems are arranged at corners of the areas, and the dismantling construction method comprises the following construction steps: determining a cutting mode; designing a range for dismantling the construction section according to the stress section; before the support is detached, support changing work is carried out; setting up a channel steel stirrup; positioning and paying off; cutting the support beam in sections; a transportation sectional support beam; the application provides a method for dismantling a large-span reinforced concrete supporting beam in order to improve the construction safety and the construction efficiency of dismantling the 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 support beam.
Background
With the continuous deep development of the constructional engineering, the underground space is more fully utilized, and in a large building provided with a plurality of layers of basement rooms, a large-span reinforced concrete supporting beam is arranged inside the large building, after the basement is excavated and the bottom plate is constructed, a foundation pit back-bracing concrete slab system is needed, and various supporting beams at the upper part of the bottom plate are removed.
At present, a concrete support beam is generally formed by erecting a steel pipe scaffold at the bottom of the concrete support beam, and then dismantling by adopting methods such as mechanical chiseling or static blasting, etc., so that the construction mode has large engineering quantity, long construction period and very waste of manpower and material resources, and during dismantling, the internal force redistribution between an internal support, a support row pile and a basement structure directly influences the deformation of a foundation pit support system, thereby influencing the stability of surrounding buildings and pipelines, and the manual dismantling has large danger coefficient and high operation difficulty, so that the manual operation mode is difficult to meet the requirements of construction safety and construction quality.
Disclosure of Invention
The application provides a construction method for dismantling a large-span reinforced concrete support beam in order to improve construction safety and construction efficiency of dismantling the support beam.
The application provides a dismantling construction method of a large-span reinforced concrete support beam, which adopts the following technical scheme:
a dismantling construction method of a large-span reinforced concrete supporting beam is characterized in that a two-layer basement is arranged in a foundation pit, a plurality of areas are arranged in the foundation pit, and supporting systems are arranged at corners of the areas.
The construction method comprises the following construction steps:
step one: determining a cutting mode: and determining the cutting mode of the large-span supporting beam.
Step two: the range of dismantling the construction section is designed according to the stress section: and calculating the load of the temporary channel steel stirrups and the basement negative two-layer roof, and calculating the dismantling workload of the support system.
Step three: support changing work is carried out before support removing: after the bottom plate construction is completed, the foundation pit is firstly subjected to external waterproof and backfill, a first back support concrete plate is arranged at the edges of the bottom plate and the foundation pit, a second layer of concrete support is removed, and then a second back support concrete plate is arranged at the positions of the negative two layers of the bottom plate of the basement and the edges of the foundation pit, and the first layer of concrete support is removed.
Step four: setting up a channel steel stirrup: and setting up temporary channel steel stirrups.
Step five: positioning and paying off: and carrying out positioning paying-off by the support system.
Step six: sectional cutting support beam: and (5) sectionally cutting the supporting beams by using a static rope sawing machine to obtain a plurality of sectionally supporting beams.
Step seven: a transportation sectional support beam: and lifting the corresponding segmented supporting beams away from the foundation pit by adopting a crane and a forklift.
Step eight: and (3) removing the channel steel stirrup: and (5) dismantling the stirrups of the channel steel, and loading and transporting away the foundation pit.
Through adopting above-mentioned technical scheme, the large-span supporting beam adopts the channel-section steel stirrup to carry out temporary support, adopt the static rope saw to cut and demolish, cut according to reasonable segmentation point, obtain multistage, the segmentation supporting beam of small, in order to follow-up transportation, cooperate crane and fork truck again and carry out handling and leave foundation ditch and job site, can adapt to the large-span foundation ditch support system of various environment effectively and demolish work, cut the large-span supporting beam through the static rope saw, can reduce traditional static blasting demolish and artifical the foundation ditch collapse phenomenon that brings, the long problem of construction time, play the effect that improves demolishs construction speed, be favorable to reducing the use amount of manpower and materials, resources are saved, and the influence to surrounding building, surrounding environment is little, accord with the requirement of construction quality, safety.
Preferably, the support system includes a supporting mechanism, and in the step four of processing the channel steel stirrup, when the first layer concrete support and the second layer concrete support are removed, at least one layer of supporting mechanism is reserved at the lower parts of the first layer concrete support and the second layer concrete support respectively.
Through adopting above-mentioned technical scheme, through reserving the support mechanism in the lower part of first layer concrete support, second floor concrete support, play the effect of interim support, reduce and appear collapsing the phenomenon when static rope saw cuts first layer concrete support, second floor concrete support, be favorable to guaranteeing operation safety.
Preferably, in the step of processing the step six of sectionally cutting the supporting beam, the channel steel stirrup is placed at the bottom of the supporting beam, and a gap backing plate is arranged between the channel steel stirrup and the supporting beam.
Through adopting above-mentioned technical scheme, the setting of gap backing plate can play the effect of caulking, leveling, has improved the assembly stability between channel-section steel stirrup and the supporting beam for the channel-section steel stirrup can bear the load that supporting beam brought better, is favorable to guaranteeing the operation security.
Preferably, in the step of processing the segmented cutting support beam in the step six, at least two channel steel stirrups are placed at the bottom of each segmented support beam according to the segmented cutting length, and the static wire saw is used for cutting the support beams in sequence: cutting off two sides of the supporting beam, cutting off the middle part of the supporting beam, and forming a cutting gap between two adjacent sectional supporting beams.
Through adopting above-mentioned technical scheme, static rope saw divide into two with supporting beam, realize the cutting of large-span supporting beam, make large-span supporting beam can decompose into multistage segmentation supporting beam, on the one hand make things convenient for subsequent handling of staff, transport work, accelerate the transport efficiency of demolishing the construction, on the other hand, through cutting supporting beam, easily operation personnel control operation flow, improve the operation security, in addition, through cutting the both sides of supporting beam earlier and then cutting the middle part, be favorable to making segmentation supporting beam atress balanced, also be convenient for fork truck lift or crane handling segmentation supporting beam upwards, the dead safety problem of card appears when reducing static rope saw cutting supporting beam, the operation security has been improved.
Preferably, the cutting slit is a bevel slit which is inclined outwards from the center of the supporting beam from bottom to top.
Through adopting above-mentioned technical scheme, the cutting gap is from lower supreme, by the outside hypotenuse seam that inclines of supporting beam center, is favorable to the static rope saw to cut off the supporting beam more easily, or separate from supporting beam in, is favorable to reducing the dead safety problem of card when the static rope saw cuts the supporting beam, has improved the operation security.
Preferably, the support system comprises a waist beam, in the processing step of performing support changing work before support dismounting in the third step, the connection part of the support beam and the waist beam is separated first, then the support beam is dismounted, and finally the waist beam is dismounted.
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 junction of separating supporting beam and waist rail earlier, demolish supporting beam, demolish the waist rail at last, accords with mechanics decomposition principle, reduces demolishs the in-process and appears collapsing the phenomenon, improves the operation security.
Preferably, the support system comprises a sealing plate, a connecting beam and a ring support beam, and the dismantling sequence is as follows: and firstly removing the sealing plate, removing the connecting beam, removing the ring supporting beam and finally removing the waist beam.
By adopting the technical scheme, the sealing plate is removed firstly, the connecting beam is removed, the ring support beam is removed, and finally the waist beam is removed, so that the mechanical decomposition principle is met, the collapse phenomenon in the removing process is reduced, and the operation safety is improved.
Preferably, the support system further comprises a gusset beam, the gusset beam is arranged at the corner of the foundation pit, and the dismantling sequence is as follows: cutting off the end part of the gusset beam and the waist beam, dismantling the connecting beam, dismantling the supporting beam and finally dismantling the waist beam, wherein the dismantling mode is as follows: the long side is removed from the short side, the middle is removed from the two sides, and the directions from outside to inside are sequentially removed.
By adopting the technical scheme, the dismantling sequence and the dismantling mode of the application are adopted, so that the method accords with the mechanical decomposition principle, reduces the change of internal force of the foundation pit supporting structure, reduces the deformation caused by overlarge stress generated by the supporting structure, ensures the uniformity of stress release in the process of dismantling and supporting, and improves the operation safety.
Preferably, a slag hole is formed in the position, close to the foundation pit, of the area.
By adopting the technical scheme, the slag-soil broken stone generated after the supporting beam is cut by the static rope sawing machine is transported away from the foundation pit along the slag hole by the loading truck, so that the follow-up centralized treatment of the slag-soil broken stone is facilitated.
Preferably, the supporting system comprises steel lattice columns, in the processing step of carrying out support changing work before support detaching in the third step, lifting spaces are reserved between the steel lattice columns and the bottom plate or between the steel lattice columns and the basement negative two-layer building plate, and the steel lattice columns are detached in a layer segmentation mode.
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 two-layer floor to the installation of crane, and follow-up crane handling work, through dismantling steel lattice column according to the segmentation of layer, 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 adopting a channel steel stirrup, is cut and dismantled by adopting a static rope sawing machine, is cut according to reasonable segmentation points, and is segmented to obtain a multi-segment small-size segmented supporting beam so as to facilitate subsequent transportation, and is lifted away from a foundation pit and a construction site by being matched with a crane and a forklift, so that the large-span supporting beam can be effectively adapted to the dismantling work of a large-span foundation pit supporting system in various environments, the problem of foundation pit collapse phenomenon and long construction time caused by traditional static blasting dismantling and manual chiseling can be reduced by cutting the large-span supporting beam by adopting the static rope sawing machine, the effect of improving the dismantling construction speed is achieved, the consumption of manpower and material resources is reduced, resources are saved, the influence on surrounding buildings and surrounding environments is small, and the requirements of construction quality and safety are met;
2. the gap backing plate can play a role in caulking and leveling, so that 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 is guaranteed;
3. by adopting the dismantling sequence and the dismantling mode, the application accords with the mechanical decomposition principle, reduces the change of internal force of the foundation pit supporting structure, reduces the deformation of the supporting structure caused by overlarge stress, ensures the uniformity of stress release in the process of dismantling and supporting, and improves the operation safety.
Drawings
FIG. 1 is a process flow diagram of a large span support beam removal construction in an embodiment of the application.
Fig. 2 is a plan view of a foundation pit support beam in an embodiment of the present application.
Fig. 3 is a floor plan of a foundation pit in an embodiment of the present application.
FIG. 4 is an elevation view of a back-braced concrete panel of a bracing system in an embodiment of the application.
Fig. 5 is a schematic view of a floor returning roof support in a forklift walking area in an embodiment of the application.
Fig. 6 is a schematic view of the structure of a channel stirrup in an embodiment of the application.
Fig. 7 is a schematic view of a channel stirrup setup in an embodiment of the application.
FIG. 8 is a schematic view of detail cutting in an embodiment of the application.
Fig. 9 is a schematic diagram of a reserved forklift walking area in an embodiment of the present application.
Fig. 10 is a schematic view of a hanging point position in an embodiment of the application.
Reference numerals illustrate: 1. a foundation pit; 10. a wide guard top; 11. supporting piles; 12. triaxial cement mixing pile waterproof curtain; 121. reinforcing a passive area of the triaxial cement mixing pile; 13. slope feet of the cement mixing piles; 14. slope spraying concrete hanging net; 15. slope top of cement mixing pile; 16. slope spraying concrete surface; 17. a slope platform; 18. double-pipe jet grouting piles; 19. a reinforcing plate; 2. a ground red line is used; 31. steel lattice columns; 32. waist beam; 33. a support beam; 4. a bottom plate; 5. a basement negative floor slab; 51. backfilling stone powder; 61. channel steel stirrups; 62. a roof returning bracket; 71. cutting the gap; 72. a gap backing plate; 81. a transfer zone; 82. a driving channel; 83. a soil outlet lane; 84. a slag outlet; 91. a first back-supporting concrete plate; 92. a second back-supporting concrete slab; 93. a first support beam; 94. and a second support beam.
Detailed Description
The application is described in further detail below with reference to fig. 1-10.
The embodiment of the application discloses a dismantling construction method of a large-span reinforced concrete support beam.
Referring to fig. 1 and 2, a construction method for dismantling a large-span reinforced concrete supporting beam is disclosed, a two-layer basement is formed in a foundation pit 1 from top to bottom, the foundation pit 1 comprises four areas, the four areas are respectively designed at four corners of the foundation pit 1, the four areas are divided into an area A, an area B, an area C and an area D according to a anticlockwise dismantling and supporting sequence, the four areas are constructed simultaneously, line production is carried out, construction rhythm is accelerated, and supporting systems are arranged at the corners of the four areas and at the intersections of the four areas, so that the internal structure of the foundation pit 1 is stable and is not easy to collapse.
In the embodiment of the application, the supporting system is a foundation pit support arranged in the foundation pit 1, and is mainly divided into: referring to fig. 3 and 4, the two-layer basement structure support and the upright structure support are both two-layer basement structure supports, the two-layer basement structure supports adopt a balanced-weight type row pile and a structure support of a large-span internal support, the upright adopts a lower concrete upright pile and a steel lattice column 31, wherein the balanced-weight type row pile comprises a plurality of support piles 11, the plurality of support piles 11 are distributed on the periphery of the foundation pit 1 side by side, the large-span internal support comprises a sealing plate, a waist beam 32, a ring support beam, a support beam 33, a pair of support beams, an angle support beam, a waist beam 32 and a connecting beam, and the assembly relationship among the sealing plate, the waist beam 32, the ring support beam, the support beam 33, the pair of support beams, the angle support beam, the waist beam 32 and the connecting beam is the prior art, the details are not repeated in the embodiment of the application, and the steel lattice column 31 is arranged at the staggered position of the two adjacent waist beams 32, so that the steel lattice column 31 is vertical to the waist beam 32, and the stability is further enhanced.
The dismantling construction steps of the large-span reinforced concrete support beam are as follows:
step one: determining a cutting mode: the steel bar is supported by a large-span reinforced concrete support beam channel steel stirrup 61 and is cut and removed by a static rope saw.
Step two: according to the stress section design and demolish the scope of construction section, calculate the load of interim channel-section steel stirrup 61, basement burden two-layer roof, calculate the support system and demolish work load, simultaneously, calculate large-span support demolish factor of safety, peripheral building subsidence, construction speed, monitor construction surrounding environment, according to geological investigation condition, draw the red line 2 of land that foundation ditch 1 was under construction, ensure that support system demolishs effectiveness and the security of construction.
Step three: support changing work is carried out before support removing: after the bottom plate 4 is constructed, the foundation pit 1 is firstly subjected to external water prevention and backfill, specifically, the fertilizer groove of the basement is backfilled, the triaxial cement mixing pile waterproof curtain 12 is arranged on the outer side, close to the balance weight type row pile, of the foundation pit 1 so as to improve the stability and the impervious performance of the side slope of the foundation pit 1, further achieve the water stopping and retaining effect, the slope spraying concrete surface 16 is arranged on the outer side of the triaxial cement mixing pile waterproof curtain 12 so as to further strengthen the stability of the side wall of the foundation pit 1 and enhance the waterproof effect, and the wide protection roof 10 of 1m is arranged on the outer side, close to the slope spraying concrete surface 16, of the foundation pit 1 so as to reduce the collapse condition of the top surface of the foundation pit 1.
In order to improve convenience of material transfer in the construction process, in the embodiment of the application, a transfer area 81 is arranged on one side of a foundation pit 1, a main soil outlet lane 83 is arranged on one side of the transfer area 81, and a slope platform 17 with a width of 5m is arranged at the position, close to the output end of the main soil outlet lane 83, of the foundation pit 1, so that convenience of material turnover in the construction stage is improved, and construction rhythm is accelerated.
In the embodiment of the application, the corner of the transferring area 81 is provided with a reinforcing plate 19 and a double-pipe jet grouting pile 18 to enhance the structural strength of the corner of the transferring area 81 and achieve the effect of water stop and soil blocking.
The cement mixing pile toe 13, the open slope spray concrete hanging net 14 and the cement mixing pile toe 15 are arranged at one corner of the A region of the foundation pit 1, so that the structural stability of the foundation pit 1 is further enhanced, the safety coefficient of large-span support dismantling 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 back-up 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 back-up concrete slab 91 is a back-up C30 concrete slab, after the first back-up concrete slab 91 is cured to the designed strength, that is, the compression strength test detection value of the first back-up concrete slab 91 reaches the designed strength of C30 concrete by 100%, the second layer concrete support is removed, then the construction is continued to the basement negative two-layer floor slab, and a second back-up concrete slab 92 with a thickness of 300mm is constructed at the position of the basement negative two-layer floor slab and the edge of the foundation pit 1, the second back-up concrete slab 92 is also a back-up C30 concrete slab, after the second back-up concrete slab 92 is cured to the designed strength, that is, the compression strength test detection value of the second back-up concrete slab 92 reaches the designed strength of C30 concrete by 100%, and the first layer concrete support and the second layer concrete support are removed, wherein the first layer concrete support and the second layer concrete support are support systems arranged in different basements.
The bottom of the bottom plate 4 is provided with a triaxial cement stirring pile passive area reinforcement 121, the triaxial cement stirring pile passive area reinforcement 121 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 basement negative first floor 5, the backfill stone powder 51 is filled on the top surface of the whole bottom plate 4, a 5m lifting 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, in order to improve the convenience of dismantling 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 used as a single small section for section dismantling, after cutting is completed, a crane or a tower crane is nearby transported to the position of a lifting point at the side of the foundation pit 1, and the foundation pit 1 is lifted out of a loading vehicle from a slag hole 84 (refer to fig. 9).
In addition, in the embodiment of the application, the dismantling sequence of each area is dismantled by adopting a jump method so as to ensure the uniformity of stress release in the dismantling process of the support beams 33 of each area, the axial force value of the rest support beams 33 and the deformation value of the peripheral roads of the foundation pit 1 are paid attention to at the moment in the dismantling process of each area, 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 overlarge, the dismantling of the support is stopped immediately so as to start an emergency plan.
Specifically, the dismantling sequence of the support in the large span is as follows:
the connection part of the support beam 33 and the waist beam 32 is separated, the support beam 33 is disassembled, and finally the waist beam 32 is disassembled.
The closure plate is removed, the tie beam is removed, the ring support beam is removed, and finally the wale 32 is removed.
The end of the corner brace beam is firstly cut off from the waist beam 32, the connecting beam is removed, the supporting beam 33 is removed, and finally the waist beam 32 is removed.
According to the actual condition of the construction site, the dismantling mode of the large-span inner support is as follows: the long side is dismantled to the minor face, the centre is dismantled to both sides, from outside to inside direction order, makes support demolish back supporting construction be difficult for producing too big stress release to the security of protection foundation ditch 1 and surrounding environment.
Step four: channel stirrups 61 are set up: temporary channel stirrups 61 are set up.
Referring to fig. 4 and 6, in the embodiment of the present application, the supporting system includes a supporting mechanism, where the supporting mechanism includes a channel steel stirrup 61 and a top returning support 62, when the first layer of concrete support and the second layer of concrete support are removed, at least one layer of supporting mechanism is reserved at the lower parts of the first layer of concrete support and the second layer of concrete support, respectively, a second support beam 94 is disposed between the bottom plate 4 and the basement negative first layer of floor 5, and a first support beam 93 is disposed at the top of the basement negative first layer of floor 5, so that the distance between the bottom surface of the first support beam 93 and the lower layer of structure is 1.6m, and the distance between the bottom surface of the second support beam 94 and the lower layer of structure is 2.3m, thereby ensuring sufficient construction space.
The channel stirrup 61 is formed by welding an upper beam, a middle beam, a lower beam, a longitudinal beam and splayed upright posts on two sides, and the setting height of each beam of the channel stirrup 61 is determined according to the actual construction condition.
Step five: positioning and paying off: the support system performs positioning paying-off so as to improve operation convenience and operation progress.
Step six: segmented cutting support beam 33: the support beam 33 is cut in sections by a static wire saw to obtain a number of section support beams.
Referring to fig. 7 and 8, according to the length of the sectional cutting of the supporting beam 33, at least two channel steel stirrups 61 are placed at the bottom of each sectional supporting beam, the edge of the placing distance is 200 mm-300 mm, a gap pad 72 is arranged between the channel steel stirrups 61 and the supporting beam 33, the gap pad 72 is made of wood Fang Changtiao, the gap pad 72 can play roles of caulking and leveling, the assembly stability between the channel steel stirrups 61 and the supporting beam 33 is improved, the channel steel stirrups 61 can bear the load brought by the supporting beam 33 better, and the operation safety is guaranteed.
In the embodiment of the application, the static rope sawing machine adopts a diamond chain sawing machine, an operator starts the static rope sawing machine to enable the diamond rope to move at a high speed so as to divide the supporting beam 33 into two parts, a water pipe is opened in the cutting process, a water source is aligned to a cutting position so as to play roles in cooling and dust suppression, and the static rope sawing machine cuts the supporting beam 33 in sequence with reference to fig. 7 and 8: 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 sectional supporting beams, so that the cutting gap 71 is a bevel edge gap which is inclined outwards from bottom to top from the center of the supporting beam 33, the phenomenon of blocking when a forklift lifts upwards and an automobile is directly lifted is reduced, and the operation safety is improved.
Step seven: a transportation sectional support beam: and (5) lifting the corresponding sectional support beams 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 slab and the horizontal space in the area of the foundation pit 1, a walking route of the forklift and the installation position of the crane are planned, and a driving channel 82 with the width of 8m is reserved at one side of the area close to the corner of the foundation pit 1, wherein the driving channels 82 in the area B and the area C are used for transporting supporting beam fragments, the driving channels 82 in the area a and the area B are used for transporting non-supporting beam fragments, and the small channels at the corner of the area are provided with concrete fragment slag holes 84 so as to facilitate transporting fragments and dregs with small volume.
In the process of walking the forklift in the area floor, the supporting mechanism at the bottom of the supporting beam 33 is not dismounted, so that the stability of the operation of the foundation pit 1 is ensured.
Referring to fig. 9 and 10, five hanging points are distributed in four areas, in the embodiment of the present application, the distance between the center of the hanging point and the side line of the foundation pit 1 is 2m, the hanging point one is provided in the area a, the hanging point two is provided in the area B, the hanging point three and the hanging point four are provided in the area C, the hanging point five is provided in the area D, the supporting beam 33 of each area is transported out of the foundation pit 1 from each hanging point by the principle of nearby, and is transported out of the construction entrance nearby, and the four areas are simultaneously constructed, and the line production is performed, so as to accelerate the construction rhythm.
Step eight: the channel stirrup 61 is removed: the channel stirrup 61 is removed and the pit 1 is lifted off.
The foregoing is illustrative of the present application, and is not meant to limit the scope of the application in any way, therefore: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.
Claims (5)
1. The dismantling construction method of the large-span reinforced concrete supporting beam is characterized in that a two-layer basement is arranged in a foundation pit (1), a plurality of areas are arranged in the foundation pit (1), and supporting systems are arranged at the corners of the areas;
the construction method comprises the following construction steps:
step one: determining a cutting mode: determining a cutting mode of the large-span support beam (33);
step two: the range of dismantling the construction section is designed according to the stress section: calculating the load of a temporary channel steel stirrup (61) and a basement negative two-layer roof, and calculating the dismantling workload of the support system;
step three: support changing work is carried out before support removing: after the construction of the bottom plate (4) is completed, firstly, performing external waterproofing and backfilling on the foundation pit (1), installing a first back support concrete plate (91) at the edge of the bottom plate (4) and the foundation pit (1), removing a second layer of concrete support, and then installing a second back support concrete plate (92) at the position of the negative two-layer floor of the basement and the edge of the foundation pit (1), and removing the first layer of concrete support;
step four: erecting a channel steel stirrup (61): setting up temporary channel steel stirrups (61);
step five: positioning and paying off: the support system performs positioning paying-off;
step six: -segmented cutting support beam (33): sectioning the supporting beams (33) by a static rope sawing machine to obtain a plurality of sectioning supporting beams;
step seven: a transportation sectional support beam: lifting the corresponding segmented support beams away from the foundation pit (1) by adopting a crane and a forklift;
step eight: removing the channel steel stirrup (61): removing the channel steel stirrup (61) and loading and transporting away the foundation pit (1);
in the machining step of the step six, the bottom of each segmented supporting beam is provided with at least two channel steel stirrups (61) according to the segmented cutting length, and the static wire saw machine is used for cutting the supporting beams (33) in sequence: cutting off two sides of the supporting beam (33) firstly, then cutting off the middle part of the supporting beam (33), and forming a cutting gap (71) between two adjacent sectional supporting beams;
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;
in the processing step of carrying out support changing work before support dismantling, a triaxial cement mixing pile waterproof curtain (12) is arranged on the outer side of the foundation pit (1), a slope-releasing concrete-spraying surface (16) is arranged on the outer side of the triaxial cement mixing pile waterproof curtain (12), and a wide guard top (10) is arranged on the outer side, close to the slope-releasing concrete-spraying surface (16), of the foundation pit (1);
the support system comprises a waist beam (32), wherein in the processing step of carrying out support replacement work before support disassembly in the third step, the connection part of the support beam (33) and the waist beam (32) is separated, then the support beam (33) is disassembled, and finally the waist beam (32) is disassembled;
the support system comprises a sealing plate, connecting beams and ring support beams, and the dismantling sequence is as follows: firstly, removing the sealing plate, removing the connecting beam, removing the ring support beam and finally removing the waist beam (32);
the support system further comprises corner support beams, wherein the corner support beams are arranged at the corners of the foundation pit (1), and the dismantling sequence is as follows: cutting off the gusset beam end part and the waist beam (32), dismantling the connecting beam, dismantling the supporting beam (33) and finally dismantling the waist beam (32), wherein the dismantling mode is as follows: the long side is removed from the short side, the middle is removed from the two sides, and the directions from outside to inside are sequentially removed.
2. The method for dismantling a long span reinforced concrete support beam as claimed in claim 1, wherein the support system comprises a supporting mechanism, and in the step of processing the channel steel stirrup (61) in the step four, at least one layer of supporting mechanism is reserved at the lower parts of the first layer of concrete support and the second layer of concrete support respectively when the first layer of concrete support and the second layer of concrete support are dismantled.
3. The method for dismantling a large span reinforced concrete support beam as claimed in claim 1, wherein in the step of processing the step six of sectioning the support beam (33), the channel stirrup (61) is placed at the bottom of the support beam (33), and a gap backing plate (72) is provided between the channel stirrup (61) and the support beam (33).
4. The method for dismantling a large span reinforced concrete support beam as claimed in claim 1, wherein a slag hole (84) is provided in the area near the foundation pit (1).
5. The dismantling construction method of the large span reinforced concrete support beam according to claim 1, characterized in that the support system comprises steel lattice columns (31), in the processing step of carrying out the support changing work before the support dismantling in the step three, a hoisting space is reserved between the steel lattice columns (31) and the bottom plate (4) or between the steel lattice columns (31) and the basement negative two-layer building plate, and the steel lattice columns (31) are dismantled in layer segments.
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