CN113106980A - Method for dismantling old beam plate in foundation pit supporting structure - Google Patents
Method for dismantling old beam plate in foundation pit supporting structure Download PDFInfo
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- CN113106980A CN113106980A CN202110283653.5A CN202110283653A CN113106980A CN 113106980 A CN113106980 A CN 113106980A CN 202110283653 A CN202110283653 A CN 202110283653A CN 113106980 A CN113106980 A CN 113106980A
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- 238000000034 method Methods 0.000 title claims abstract description 53
- 238000005520 cutting process Methods 0.000 claims abstract description 68
- 238000010276 construction Methods 0.000 claims description 10
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 8
- 238000009412 basement excavation Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 6
- 238000000638 solvent extraction Methods 0.000 claims description 6
- 238000005553 drilling Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims description 3
- 229910003460 diamond Inorganic materials 0.000 description 10
- 239000010432 diamond Substances 0.000 description 10
- 230000006872 improvement Effects 0.000 description 7
- 239000004567 concrete Substances 0.000 description 6
- 239000011150 reinforced concrete Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 239000003082 abrasive agent Substances 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 239000004575 stone Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/08—Wrecking of buildings
Abstract
The invention discloses a method for dismantling an old beam slab in a foundation pit supporting structure, wherein in the method, the part of the old beam slab, which is not shielded by a new beam slab, is cut into a shape convenient for hoisting by a crane for carrying, and the part of the old beam slab, which is shielded by the new beam slab, is cut into a shape convenient for consignment by a forklift for carrying; the cutting shape is adjusted according to the relative position of the old beam plate and the new beam plate, so that the obstruction of the new beam plate to the shielding of the old beam plate is eliminated, and the dismantling efficiency is accelerated.
Description
Technical Field
The invention relates to the technical field of foundation pit operation, in particular to a method for dismantling an old beam plate in a foundation pit supporting structure.
Background
Along with the increasing number of underground engineering in buildings, the dismantling work of the large-area basement foundation pit supporting structure directly relates to the construction progress and the economic benefit of the engineering.
During the dismantling process of the basement foundation pit supporting structure, the inventor of the invention finds that the new beam slab is covered above the old beam slab before the old beam slab of the basement is dismantled. For example, the distance between the new beam slab of the first layer newly constructed in the engineering and the old beam slab of the old layer below the new beam slab is very small, and when the old beam slab of the basement is removed, the new beam slab can shield part of the old beam slab, so that the difficulty in removing the old beam slab is caused.
Disclosure of Invention
The invention aims to provide a method for removing an old beam plate in a foundation pit supporting structure, which is characterized in that the cutting shape is adjusted according to the relative position of the old beam plate and a new beam plate, so that the obstruction of the new beam plate on the shielding of the old beam plate is eliminated, and the removal efficiency is accelerated.
The embodiment of the invention provides a method for dismantling an old beam plate in a foundation pit supporting structure, which comprises the following steps:
supporting the part to be cut of the old beam plate by using a support frame;
cutting a first plate from the part to be cut along the oblique direction under the condition that shielding exists above the old beam plate; wherein the cutting surface of the first plate is positioned below the cutting surface of the part to be cut;
after the cutting is finished, the first plate is conveyed to a first designated position from the lower part of the part to be cut by using the first conveying device.
As a further improvement, the demolition method further includes:
cutting a second plate from the part to be cut in an oblique direction under the condition that no shielding exists above the old beam plate; wherein the cutting surface of the second plate is positioned above the cutting surface of the part to be cut;
and after the cutting is finished, the second plate is conveyed to a second appointed position from the upper part of the part to be cut by using a second conveying device.
As a further improvement, the demolition method further includes:
utilizing a second carrying device to carry the first plate located at the first appointed position to a second appointed position;
and cutting the first plate and the second plate at the second appointed position in a partitioning manner so as to be convenient for transportation out of the construction site.
As a further improvement, the first designated position is located on the inner side of the foundation pit, and the second designated position is located on the outer side of the foundation pit.
As a further improvement, the specific steps of cutting out the first or second panel from the portion to be cut in an oblique direction are:
respectively drilling holes penetrating through the old beam plate at four corners of a partitioning outline which is marked on the part to be cut and corresponds to the first plate or the second plate; wherein the axial direction of the hole and the vertical direction form an included angle of more than 0 degree;
and a rope saw is used for penetrating through the two adjacent holes and cutting the first plate or the second plate along the block profile.
Specifically, the included angle ranges from 5 ° to 10 °.
As a further improvement, in cutting out the first panel or the second panel from the portion to be cut, the demolition method further comprises:
the distance between the first carrying device and the edge of the range right below the first plate or the second plate is kept to be more than 4 meters.
As a further improvement, the demolition method further includes:
when the first designated location is not the bottom layer, a first reinforcing bracket is installed at the bottom of the first designated location.
Specifically, the first carrying device is a forklift, and the second carrying device is a crane.
As a further improvement, the demolition method further includes:
when the road surface of fork truck's walking is not the bottom, consolidate the support at the bottom installation second of fork truck walking circuit.
Compared with the prior art, the embodiment of the invention at least has the following beneficial effects:
in the method, the part of the old beam slab which is not shielded by the new beam slab is cut into a shape which is convenient for hoisting by a crane for carrying, and the part of the old beam slab which is shielded by the new beam slab is cut into a shape which is convenient for consignment by a forklift for carrying; the cutting shape is adjusted according to the relative position of the old beam plate and the new beam plate, so that the obstruction of the new beam plate to the shielding of the old beam plate is eliminated, and the dismantling efficiency is accelerated.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The invention is further described below with reference to the accompanying drawings and examples;
fig. 1 is a schematic view of a foundation pit supporting structure to which the demolition method provided by the embodiment of the invention is applied.
Fig. 2 is a schematic diagram of a demolition process performed by using the demolition method according to the embodiment of the present invention.
Fig. 3 is a schematic view showing the cut shape of the first plate block in the embodiment of the present invention in the case where there is a shield above the old beam slab.
Fig. 4 is a structural view showing a cut shape of a second plate in the embodiment of the present invention in the case where there is no shielding above an old beam slab.
Fig. 5 is a flowchart of one example of a teardown method in an embodiment of the present invention.
Fig. 6 is a flowchart of another example of a teardown method in an embodiment of the present invention.
Reference numerals:
110. a soil layer; 120. supporting piles; 121. a crown beam; 122. a new beam slab; 210. carrying out a layer of old beam slab; 211. carrying out a layer of supporting frame; 220. carrying out secondary layer old beam plates; 221. carrying out two-layer supporting frame; 230. a load-bearing wall; 240. a bottom layer; 250. a portion to be cut; 260. a first plate; 270. a second plate; 310. a forklift; 320. a vertical plane; 330. an extension line;
Detailed Description
Reference will now be made in detail to the present preferred embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to like elements throughout.
Technical terms related to the embodiments of the present invention are briefly described below in order to facilitate those skilled in the art to understand technical contents of the embodiments of the present invention.
The foundation pit is a soil pit excavated at the design position of the foundation according to the elevation of the foundation and the plane size of the foundation.
A support pile is mainly used for bearing transverse thrust. The pile is generally used for foundation pit support, side slope support and landslide control, bears horizontal soil pressure or landslide thrust, generally needs higher reinforcement than a foundation pile bearing vertical force, and is often used together with an anchor rod (cable) (pile anchor structure).
The beam plate is the combination of interacting beams and plates in the floor system. The cast-in-situ reinforced concrete beam slab system is a floor system with the most use and the widest application range at present, and the safety and the economical efficiency of the cast-in-situ reinforced concrete beam slab system have great influence on buildings. The integral cast floor system has the advantages that the beam and the plate are integral in interaction, are closely related to each other and are stressed and deformed together.
The scaffold is a working platform which is erected for ensuring that each construction process is smoothly carried out.
Before describing the demolition method of the embodiment of the present invention in detail, it is necessary to explain a scenario in which the demolition method of the embodiment of the present invention is applied.
When the foundation pit needs to be expanded in actual engineering, the foundation pit needs to be expanded, a support pile 120 is arranged on the expanded foundation pit wall, and the top of the support pile 120 is connected with a new beam plate 122 through a crown beam 121, so that the construction of a new support system is completed. For engineering safety, the old support system needs to be dismantled after the construction of the new support system is completed. As shown in fig. 1, before the old beam slab 210 at the minus layer of the basement is dismantled, the new beam slab 122 covers the old beam slab 210 at the minus layer, and the gap between the new beam slab and the old beam slab is small, so that the old supporting system is dismantled, but the embodiment of the invention provides a method for dismantling the old beam slab in the foundation pit supporting structure, the cutting shape is adjusted according to the relative position between the old beam slab and the new beam slab 122, the blockage of the old beam slab by the new beam slab 122 is eliminated, and the dismantling efficiency is accelerated.
Hereinafter, the method for removing the old beam slab in the supporting structure of the foundation pit according to the embodiments of the present invention will be described and explained in detail through several specific embodiments.
In one embodiment, as shown in fig. 5, there is provided a method of demolishing an old beam slab in an excavation supporting structure, the method comprising:
step S102: the portion 250 to be cut of the old beam plate is supported by the support frame.
As shown in fig. 1 and 2, the old supporting structure in the foundation pit sequentially includes a negative one-layer old beam slab 210, a negative two-layer old beam slab 220 and a bottom layer 240 located below the new beam slab 122 from top to bottom, wherein the negative one-layer old beam slab 210, the negative two-layer old beam slab 220 and the bottom layer 240 are all hard and heavy concrete layers 110 formed by pouring steel bars and concrete. The bottom layer 240 is built on the soil layer 110 of the foundation pit, the old beam slab 210 with the first floor and the old beam slab 220 with the second floor are supported and built above the bottom layer 240 through the bearing wall 230, and the old supporting system forms a basement structure.
In order to prevent the concrete blocks (i.e., concrete blocks) cut from the old beam slab 210 and the old beam slab 220 on the second floor from directly falling onto the old beam slab 220 and the bottom layer 240 on the first floor and the old beam slab 220 on the second floor to cause safety accidents, the bottom of the to-be-cut part 250 on the old beam slab 210 and the old beam slab 220 on the first floor and the old beam slab 220 on the second floor is formed into a support frame 211 and a support frame 221 on the second floor by using scaffolds for supporting the first plate block 260 and the second plate block 270 cut from the old beam slab 210 on the second floor and the old beam slab 220 on the second floor.
It should be noted that the old beam slab referred to in this embodiment includes a negative one-layer old beam slab 210 and a negative two-layer old beam slab 220.
Step S104: cutting a first slab 260 from the portion 250 to be cut in an oblique direction in case there is a shelter above the old beam slab; wherein the cutting surface of the first plate 260 is positioned below the cutting surface of the portion to be cut 250.
Since the upper side of the old beam slab is hidden by the new beam slab 122, it is inconvenient to directly carry the cut first slab 260 out of the pit by using a crane, and thus, the cut first slab 260 needs to be taken away from the old beam slab from the lower side of the beam slab.
Further, the specific steps of cutting the first slab 260 from the portion to be cut 250 in an oblique direction are:
step S1041: drilling holes penetrating the old beam plate at four corners of the block profile marked on the portion 250 to be cut corresponding to the first plate block 260, respectively; wherein, the axial of hole and vertical direction become the contained angle that is greater than 0.
Specifically, the square partitioning outline of the first plate 260 is marked above the old beam plate by using a bullet line, for example, the size of each first plate 260 may be 1.5m by 1.5m, the plate thickness is 0.4m, each first plate 260 weighs about 2.2 tons, and the specification of the forklift 310 should be selected according to the weight of the first plate 260. Then, holes penetrating through the old beam plate are drilled at four corners of the contour of the block by using a hammer, as shown in fig. 3, wherein a dotted line is an extension line 330 of the axis of the hole, a dotted line is a vertical plane 320, and an included angle α formed by the two is 5 ° to 10 °, that is, the cross section of the first block 260 as viewed from the figure is a right trapezoid.
Step S1042: the first plate 260 is cut along the contour of the block by a wire saw through two adjacent holes.
Specifically, in this embodiment, a diamond wire saw is used for cutting.
The diamond rope of the diamond rope saw is driven by a hydraulic motor to move around a cutting surface at a high speed to grind a cutting body, so that the cutting work is completed. Since diamond single crystal is used as the abrasive material, it is possible to cut hard objects such as stone, reinforced concrete, and the like. The cutting adopts hydraulic power unit, utilizes the diamond rope to embrace the bundle fixedly the old roof beam board that will cut earlier stage, utilizes the cylinder on the hydraulic power unit drive sash, and the in-process cylinder of cutting is incessant to walk towards the sash top, waits that the cylinder walks after a certain position, and the concrete piece that will cut is about to cut the completion. The cutting process is safe and convenient to operate, vibration and noise are low, and the cut objects can be classified under the condition of almost no disturbance.
It can be understood that since the first block 260 is obliquely cut from the portion to be cut 250, the cutting surface of the first block 260 is positioned below the cutting surface of the portion to be cut 250, and when the first block 260 is removed from the old beam slab by using the forklift 310, the cutting surface of the portion to be cut 250 is positioned above the cutting surface of the first block 260, the removal of the first block 260 is less hindered by the remaining portion to be cut 250; and because first plate 260 is upright trapezoidal, in the process of taking out first plate 260 from the middle of two parts 250 to be cut along the vertical downward direction, certain displacement in the horizontal direction can be allowed, the operation difficulty of taking first plate 260 away from forklift 310 is reduced, and the dismantling efficiency is accelerated.
Step S106: after the cutting is completed, the first plate 260 is carried to the first designated position from below the portion 250 to be cut by the first carrying means.
As shown in fig. 2, the first transporting device is a forklift 310, the first designated position is located on the inner side of the foundation pit, and when a sufficient amount of the first slabs 260 stacked on the first designated position on the inner side of the foundation pit is accumulated, the first slabs are transported out of the foundation pit by the crane in a unified manner, so that the demolition efficiency can be further improved.
As shown in fig. 6, in one embodiment, there is provided a method of demolishing an old beam slab in an excavation supporting structure, the method comprising:
step S202: the portion 250 to be cut of the old beam plate is supported by the support frame.
Step S204: cutting a first slab 260 from the portion 250 to be cut in an oblique direction in case there is a shelter above the old beam slab; wherein the cutting surface of the first plate 260 is positioned below the cutting surface of the portion to be cut 250.
Step S206: after the cutting is completed, the first plate 260 is carried to the first designated position from below the portion 250 to be cut by the first carrying means.
The specific implementation of steps S202 to S206 refers to steps S102 to S106 in the above embodiment.
Step S208: cutting a second slab 270 from the portion to be cut 250 in an oblique direction, in the absence of a barrier above the old beam slab; wherein the cutting surface of the second plate 270 is located above the cutting surface of the portion 250 to be cut;
since the upper side of the old beam is not covered by the new beam 122, the second plate 270 can be directly moved out of the pit by a crane.
Further, the specific steps of cutting the second plate 270 from the portion to be cut 250 in an oblique direction are:
step S2081: drilling holes penetrating the old beam plate at four corners of the block profile marked on the portion 250 to be cut corresponding to the second plate 270, respectively; wherein, the axial of hole and vertical direction become the contained angle that is greater than 0.
Specifically, the square partitioning outline of the second plate 270 is marked above the old beam plate by using a bullet line, for example, the size of each second plate 270 may be 1.5m by 1.5m, the plate thickness is 0.4m, each second plate 270 weighs about 2.2 tons, and the specification of the crane should be selected according to the weight of the second plate 270. Then, holes penetrating through the old beam plate are drilled at four corners of the contour of the block by using a hammer, as shown in fig. 4, wherein a dotted line is an extension line 330 of the axis of the hole, a dotted line is a vertical plane 320, and an included angle β formed by the two is 5 ° to 10 °, that is, the cross section of the second block 270 as viewed from the figure is an inverted trapezoid.
Step S2082: and a rope saw is used for penetrating through two adjacent holes and cutting the second plate block 270 along the contour of the block.
Specifically, in this embodiment, a diamond wire saw is used for cutting.
The diamond rope of the diamond rope saw is driven by a hydraulic motor to move around a cutting surface at a high speed to grind a cutting body, so that the cutting work is completed. Since diamond single crystal is used as the abrasive material, it is possible to cut hard objects such as stone, reinforced concrete, and the like. The cutting adopts hydraulic power unit, utilizes the diamond rope to embrace the bundle fixedly the old roof beam board that will cut earlier stage, utilizes the cylinder on the hydraulic power unit drive sash, and the in-process cylinder of cutting is incessant to walk towards the sash top, waits that the cylinder walks after a certain position, and the concrete piece that will cut is about to cut the completion. The cutting process is safe and convenient to operate, vibration and noise are low, and the cut objects can be classified under the condition of almost no disturbance.
It can be understood that since the second plate 270 is obliquely cut from the portion to be cut 250, the cutting surface of the second plate 270 is located above the cutting surface of the portion to be cut 250, and when the second plate 270 is removed from the old beam slab by using the crane, the cutting surface of the portion to be cut 250 is located above the cutting surface of the second plate 270, the removal of the second plate 270 is less hindered by the remaining portion to be cut 250; and because the second plate 270 is in the shape of an inverted trapezoid, a certain displacement in the horizontal direction can be allowed in the process of taking the second plate 270 out of the middle of the two parts 250 to be cut in the vertical upward direction, so that the difficulty in taking the second plate 270 out of a crane is reduced, and the dismantling efficiency is accelerated.
Step S210: after the cutting is completed, the second block 270 is transferred to a second designated position from above the portion 250 to be cut by using the second transfer means.
Specifically, the second handling device is a crane, the second designated position is located on the outer side of the foundation pit, the cut second plate 270 does not need to be stacked in the foundation pit, the second plate 270 does not need to be carried out from the foundation pit, and the dismantling efficiency is improved.
It can be understood that, in this embodiment, two situations encountered in the process of removing the old beam slab are considered, for the part of the old beam slab that is not covered by the new beam slab 122, the shape convenient for hoisting by the crane is cut for carrying, and for the part of the old beam slab that is covered by the new beam slab 122, the shape convenient for consignment by the forklift 310 is cut for carrying; the cutting shape is adjusted according to the relative position of the old beam plate and the new beam plate 122, so that the obstruction of the new beam plate 122 to the old beam plate is eliminated, and the dismantling efficiency is accelerated.
In some embodiments, the method of demolition further comprises:
step S301: using a second conveying device to convey the first plate 260 located at the first designated position to a second designated position;
step S302: the first panel 260 and the second panel 270 at the second designated positions are cut into pieces to be transported out of the construction site.
In this embodiment, carry out the cutting of piecemeal with the first plate 260 and the second plate 270 of second assigned position, conveniently transport and carry out the breakage outside the industrial area, promoted the efficiency of construction.
Preferably, during the process of cutting the first plate 260 or the second plate 270 from the portion to be cut 250, the removing method further comprises:
the first handling means is kept at a distance of more than 4 meters from the edge of the area directly below the first panel 260 or the second panel 270.
By keeping the distance between the first carrying device and the edge of the range right below the first plate 260 or the second plate 270 to be more than 4 meters, the safety accident caused by the possible falling of the first plate 260 or the second plate 270 is avoided.
In one embodiment, the first handling device is a forklift 310, the second handling device is a crane, and the demolition method further comprises:
when the first designated location is not the bottom layer 240, a first reinforcing bracket is installed at the bottom of the first designated location.
As an example, the first designated position is the old beam slab 210 with the minus layer, and since each first slab 260 weighs 2.2 tons, if the old beam slab 210 with the minus layer at the first designated position is pressed too much, collapse is easily caused, and therefore, a first reinforcing bracket needs to be installed at the bottom of the first designated position to ensure construction safety.
Specifically, when the road surface on which the forklift 310 travels is not the bottom layer 240, a second reinforcing bracket is installed at the bottom of the travel route of the forklift 310. For example, the pavement on which the forklift 310 travels is provided with the old beam slab 210, and in order to avoid the excessive pressure on the old beam slab 210 in the next floor, a second reinforcing bracket needs to be installed at the bottom of the traveling line of the forklift 310, so that the construction safety is ensured.
In the description of the present invention, it should be understood that the orientation or positional relationship referred to in the description of the orientation, such as the upper, lower, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, the meaning of a plurality of means is one or more, the meaning of a plurality of means is two or more, and larger, smaller, larger, etc. are understood as excluding the number, and larger, smaller, inner, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless otherwise explicitly limited, terms such as arrangement, installation, connection and the like should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific contents of the technical solutions.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
Claims (10)
1. A method for dismantling an old beam plate in a foundation pit supporting structure is characterized by comprising the following steps:
supporting the part to be cut of the old beam plate by using a support frame;
cutting a first plate from the part to be cut along the oblique direction under the condition that shielding exists above the old beam plate; wherein the cutting surface of the first plate is positioned below the cutting surface of the part to be cut;
after the cutting is finished, the first plate is conveyed to a first designated position from the lower part of the part to be cut by using the first conveying device.
2. The method of removing old beam slabs in an excavation supporting structure according to claim 1, wherein the method further comprises:
cutting a second plate from the part to be cut in an oblique direction under the condition that no shielding exists above the old beam plate; wherein the cutting surface of the second plate is positioned above the cutting surface of the part to be cut;
and after the cutting is finished, the second plate is conveyed to a second appointed position from the upper part of the part to be cut by using a second conveying device.
3. The method of removing old beam slabs in an excavation supporting structure according to claim 2, wherein the method further comprises:
utilizing a second carrying device to carry the first plate located at the first appointed position to a second appointed position;
and cutting the first plate and the second plate at the second appointed position in a partitioning manner so as to be convenient for transportation out of the construction site.
4. The method for removing the old beam plate in the foundation pit supporting structure according to claim 3, wherein the first designated position is located on the inner side of the foundation pit, and the second designated position is located on the outer side of the foundation pit.
5. The method for removing the old beam slab in the foundation pit supporting structure according to claim 1, wherein the step of cutting the first slab or the second slab from the portion to be cut in the oblique direction comprises the following steps:
respectively drilling holes penetrating through the old beam plate at four corners of a partitioning outline which is marked on the part to be cut and corresponds to the first plate or the second plate; wherein the axial direction of the hole and the vertical direction form an included angle of more than 0 degree;
and a rope saw is used for penetrating through the two adjacent holes and cutting the first plate or the second plate along the block profile.
6. A method as claimed in claim 5, wherein the included angle is in the range of 5 ° to 10 °.
7. The method for removing an old beam slab in a supporting structure of a foundation pit according to claim 1, wherein in the process of cutting out the first slab or the second slab from the portion to be cut, the method further comprises:
the distance between the first carrying device and the edge of the range right below the first plate or the second plate is kept to be more than 4 meters.
8. The method of removing old beam slabs in an excavation supporting structure according to claim 1, wherein the method further comprises:
when the first designated location is not the bottom layer, a first reinforcing bracket is installed at the bottom of the first designated location.
9. The method for removing the old beam slab in the foundation pit supporting structure according to claim 1, wherein the first carrying device is a forklift and the second carrying device is a crane.
10. The method of removing old beam slabs in an excavation supporting structure of claim 9, wherein the method further comprises:
when the road surface of fork truck's walking is not the bottom, consolidate the support at the bottom installation second of fork truck walking circuit.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115030559A (en) * | 2022-05-24 | 2022-09-09 | 四川农业大学 | Method for dismantling cast-in-situ concrete beam slab column of constructed building |
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| CN112343064A (en) * | 2020-11-27 | 2021-02-09 | 中铁七局集团第五工程有限公司 | Construction method for dismantling large-section annular concrete support beam of deep foundation pit |
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