A temporary support removal method for existing concrete components

Abstract

The present invention discloses a temporary support removal method for existing concrete components, which belongs to the technical field of building removal, and includes the following steps: marking according to preset segmentation positions, dividing the existing concrete components into multiple concrete segments from bottom to top for easy cutting operation; cutting the first end face slit of the first concrete segment starting from the lower end; installing two annular limiting devices at intervals on the concrete component; installing a first jack between the two annular limiting devices; cutting the second end face slit of the first concrete segment; lifting the first concrete segment from its original position; installing a second jack between the two cut end faces, and disassembling the two annular limiting devices; repeating the above steps to complete the removal of all concrete segments. The removal method disclosed by the present invention can effectively support and remove existing concrete components, thereby improving the removal efficiency of buildings.

Description

Technical Field

[0001] The invention belongs to the technical field of building demolition, and in particular relates to a temporary support demolition method for existing concrete components. Background Art

[0002] Old concrete structures such as buildings, roads and bridges may need to be demolished and rebuilt due to outdated functions, insufficient safety or non-compliance with new urban planning requirements. In this case, recycling the demolished concrete can reduce the demand for new raw materials, reduce construction costs, and reduce the generation of waste. When dismantling load-bearing beams or other important supporting components, if the existing buildings are not supported in time, it is easy to cause the building to collapse, which poses certain safety hazards. In different design scenarios, some existing concrete columns do not have the conditions for setting up temporary supports for the upper structure of the building due to reasons such as excessive support height and occupation of the lower site, which seriously affects the demolition efficiency of existing buildings. Summary of the invention

[0003] In view of this, an object of the present invention is to provide a temporary support and removal method for existing concrete components, which can effectively support and remove existing concrete components, thereby improving the demolition efficiency of buildings.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] The present invention discloses a method for removing temporary supports of existing concrete components, comprising the following steps:

[0006] Step 1: Marking according to preset segmentation positions, marking vertically on the surface of the concrete component, and dividing the existing concrete component into multiple concrete segments from bottom to top to facilitate cutting operations;

[0007] Step 2, cutting the first end face slit of the first concrete segment starting from the lower end;

[0008] Step 3: Install two annular limiting devices on the concrete member at intervals, the two annular limiting devices are symmetrically arranged at both ends of the first concrete segment, and the annular limiting devices are fastened to the concrete member;

[0009] Step 4: Install a first jack between the two annular limit devices, use the lower concrete member as support, and start the first jack to lift the upper concrete member to expose the first end face cut;

[0010] Step 5, cutting the second end surface seam of the first concrete segment;

[0011] Step 6, lifting the first concrete segment from its original position and trimming the two cut end surfaces of the original concrete component;

[0012] Step 7: Install a second jack between the two cut end faces, the second jack is used to support the upper concrete member, and disassemble the two annular limit devices;

[0013] Step 8: Repeat steps 2 to 7 to complete the removal of all concrete segments.

[0014] Furthermore, the annular limiting device includes a first limiting ring and a second limiting ring, one end of the first limiting ring and one end of the second limiting ring are hinged, and the other end of the first limiting ring and the other end of the second limiting ring are connected by a locking piece. During installation, the first limiting ring and the second limiting ring are combined and encircled the outside of the concrete component.

[0015] Furthermore, before supporting, a radial pressing block is installed on the annular limiting device, one end of the radial pressing block is hinged to the annular limiting device, and the other end of the radial pressing block is connected to the annular limiting device through an elastic pushing device.

[0016] Furthermore, the elastic pushing device includes a sliding seat, a screw, a first elastic support member, a gear, a gear seat, a gear ring, a shift rod, a connecting rod, and a pin shaft. The sliding seat is installed on the annular limiting device along the vertical sliding. The upper end of the sliding seat is fixedly connected to the screw rod, and the screw rod is matched with the inner ring thread of the gear. The gear is connected to the annular limiting device through the gear seat. The first elastic support member is installed between the gear seat and the sliding seat, the gear is meshed with the gear ring, and the lower end of the gear ring is fixedly connected to the shift rod, the shift rod is connected to the pin shaft through the connecting rod, and the pin shaft is connected to the radial pressure block.

[0017] Furthermore, a support is installed on the connecting rod, a guide rod is slidably installed in the support, one end of the guide rod is connected to the pin shaft, a second elastic support member is installed between the pin shaft and the support, and the pin shaft is also installed in a guide groove opened on the connecting rod.

[0018] Furthermore, the gear seat is connected to the annular limiting device via an annular mounting seat, a groove cooperating with the gear ring is formed on the annular mounting seat, and a ball bearing for supporting the gear ring is installed on the inner side of the groove.

[0019] Furthermore, a wedge block is slidably installed on the inner side of the annular limit device. During the specific installation, the wedge block is slidably installed in the slide groove opened on the inner side of the annular limit device, with the wedge surface of the wedge block facing outward. A limit pin is fixed on the inner side of the annular limit device, and a limit piece is installed on the limit pin. The limit pin is slidably set in the stepped groove opened on the wedge block, and the wedge block is limited radially by the limit piece.

[0020] The beneficial effects of the present invention are:

[0021] The present invention discloses a temporary support and removal method for existing concrete components. The method cuts each concrete segment in sequence from bottom to top and then removes it. Before removal, the upper concrete component can be lifted by a first jack. Two sets of annular limit devices are used as support springboards, and there is no need to set up a support base. This breaks through the limitation of the external support environment, and can effectively support and remove the existing concrete components, thereby improving the demolition efficiency of the building.

[0022] In the demolition method disclosed in the present invention, the blank section after demolition is replaced by the second jack for support, and the two annular limit devices can be disassembled and reused, thereby saving costs and improving demolition efficiency. The demolition method of the present invention can be applied to the demolition of higher concrete components, especially to the support demolition of some large special-shaped buildings where suitable support points cannot be found.

[0023] In the demolition method disclosed in the present invention, two groups of first jacks are used to gradually support the concrete component from bottom to top, which not only reduces the operation steps, but also allows a larger space for the hoisting of the concrete segment, avoiding the instability problem caused by the collision between the segment and the device.

[0024] Other advantages, objectives and features of the present invention will be described in the following description and will be apparent to those skilled in the art to some extent, or those skilled in the art may be taught from the practice of the present invention. The objectives and other advantages of the present invention may be realized and obtained through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to make the purpose, technical solution and beneficial effects of the present invention clearer, the present invention provides the following drawings for illustration:

[0026] Figure 1 It is a construction flow chart of the demolition method of the present invention;

[0027] Figure 2 It is a schematic diagram of the construction steps of the demolition method of the present invention;

[0028] Figure 3 The structure diagram of the annular limit device Figure 1 ;

[0029] Figure 4 The structure diagram of the annular limit device Figure 2 ;

[0030] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0031] The markings in the accompanying drawings are as follows: concrete member 1, concrete segment 2, first end face slit 3, annular limiting device 4, first jack 5, second end face slit 6, second jack 7, first limiting ring 8, second limiting ring 9, locking member 10, radial pressure block 11, slide seat 12, screw 13, first elastic support member 14, gear 15, gear seat 16, gear ring 17, shift rod 18, connecting rod 19, pin 20, support 21, guide rod 22, second elastic support member 23, guide groove 24, annular mounting seat 25, ball 26, wedge block 27, slide groove 28, limiting pin 29, limiting member 30, stepped groove 31. DETAILED DESCRIPTION

[0032] like Figures 1 to 5 As shown, the present invention discloses a method for removing temporary supports of existing concrete components, comprising the following steps:

[0033] Step 1: Marking is performed according to the preset segmentation positions. The segmentation positions should be selected at the weak parts of the column as much as possible, such as joints and cracks. Each concrete segment 2 corresponds to two cuts, that is, after the two cuts are completed, the recycled concrete segment 2 formed between the two cuts is formed. After the marking is completed, the existing concrete component 1 is divided into multiple concrete segments 2 from bottom to top to facilitate the cutting operation;

[0034] In the embodiment of the present invention, the concrete member 1 is a cylindrical concrete column, and can also be applied to a vertically supported square column as required, as can be understood by those skilled in the art. The specific cutting machine adopts a wire saw machine, and cutting is performed by a steel wire, which can avoid interference with the device to a certain extent.

[0035] Step 2: Cut the first end face slit 3 of the first concrete segment 2 starting from the lower end. The first end face slit 3 is located at the upper end of the first concrete segment 2; adjust the position and angle of the cutting device to align it with the segmented position of the column. Make sure that the cutting disc or saw blade is perpendicular to the surface of the column to ensure the cutting quality. During the cutting process, pay attention to the changes in the column. If there are abnormal conditions such as cracks or deformation, stop cutting immediately and take appropriate measures to deal with it.

[0036] In some other embodiments, the first end face slit 3 can be selected to be located at the lower end of the first concrete segment 2. However, in this way, it is not easy to stabilize the first concrete segment 2 when cutting the second slit. Technical personnel in this field can make the selection according to their needs.

[0037] Step 3: Install two annular limiting devices 4 on the concrete member 1 at intervals. The two annular limiting devices 4 are symmetrically arranged at the two ends of the first concrete segment 2. The upper annular limiting device 4 is located on the upper side of the first end face slit 3, and the lower annular limiting device 4 is located on the lower side of the second end face slit 6. Therefore, the interval between the two annular limiting devices 4 is at least enough for the first concrete segment 2 to be hoisted. Finally, the annular limiting device 4 is fastened to the concrete member 1 to facilitate the subsequent installation and support of the first jack 5.

[0038] Step 4, install the first jack 5 between the two annular limit devices 4, the first jack 5 is supported by the annular limit device 4, and the annular limit device 4 is supported by the concrete component 1 at the lower end. When in use, start the first jack 5 to lift the upper concrete component 1 to expose the first end face slit 3, which is convenient for the subsequent cutting of the second end face slit 6 and the lifting of the concrete segment 2; when installing the first jack 5, first shorten the first jack 5, and then gradually adjust the thread of the first jack 5 so that the first jack 5 is continuously lifted until the first end face slit 3 is lifted by at least 10 mm, and the maximum does not exceed 100 mm, so as to avoid damage to the building structure.

[0039] Step 5, cutting the second end face slit 6 of the first concrete segment 2. During the cutting, the first concrete segment 2 is clamped to keep it stable. After the two end face slits are cut, the cutting of the first concrete segment 2 is completed.

[0040] Step 6: lift the first concrete segment 2 from its original position and trim the two cut end faces of the original concrete component 1 to facilitate the subsequent support of the second jack 7, reduce the deviation of the support axis, and ensure the stability of the support;

[0041] Step 7: Install the second jack 7 between the two cutting end faces. The second jack 7 is used to support the upper concrete member 1. At this time, the position of the first jack 5 is stabilized to prevent the safety stability caused by its falling off. Finally, the two annular limit devices 4 are disassembled, which can be used for the subsequent cutting and removal operation of the concrete segment 2.

[0042] Step eight, repeat steps two to seven to complete the removal of all concrete segments 2, until all concrete components 1 are removed. Since the remaining building has no recycling value, all second jacks 7 can be removed one by one without considering the damage to the existing building.

[0043] In the embodiment of the present invention, the number of the first jacks 5 is two groups, which are evenly distributed around the concrete component 1. According to actual conditions, the number of the first jacks 5 can be multiple groups to ensure stability during support.

[0044] In this embodiment, taking the annular limiting device 4 located at the top as an example, the annular limiting device 4 includes a first limiting ring 8 and a second limiting ring 9, both of which are semicircular, and one end of the first limiting ring 8 and one end of the second limiting ring 9 are hinged, and the other end of the first limiting ring 8 and the other end of the second limiting ring 9 are connected by a locking member 10. During installation, the first limiting ring 8 and the second limiting ring 9 are combined and embraced on the outside of the concrete component 1. Thereby, the fixing between the annular limiting device 4 and the existing concrete component 1 is realized.

[0045] In the embodiment of the present invention, the first limiting ring 8 and the second limiting ring 9 are respectively integrally connected with a connecting plate, the locking member 10 is a bolt connecting the two connecting plates, and the combined circular ring formed between the first limiting ring 8 and the second limiting ring 9 is slightly smaller than the diameter of the concrete column. When the first limiting ring 8 and the second limiting ring 9 are tightened, they can be tightly fixed on the outside of the concrete column, thereby serving as a supporting fulcrum for the first jack 5, which is convenient for supporting the concrete component 1 during demolition.

[0046] In this embodiment, before supporting, a radial pressing block 11 is installed on the annular limiting device 4. The radial pressing block 11 is arc-shaped and has anti-slip pressing teeth inside. One end of the radial pressing block 11 is hinged to the annular limiting device 4, and the other end of the radial pressing block 11 is connected to the annular limiting device 4 through an elastic pushing device. When the first jack 5 acts, the radial pressing block 11 can be pushed by the elastic pushing device, and the radial pressing block 11 can rotate around its hinged end, and can be pressed against the surface of the concrete component 1 in the radial direction, so as to play a role of strengthening the fastening and preventing the annular limiting device 4 from falling out.

[0047] In the device disclosed in the present invention, the radial pressure block 11 provides additional pressing force, which can strengthen the fastening effect of the annular limiting device 4. Since the radial pressure block 11 directly contacts the surface of the concrete component 1, it can avoid damage to the concrete segment 2, effectively ensure that the concrete segment 2 is not damaged, and also has a strong fastening force. The force increases according to the increase of the lifting height of the first jack 5, further strengthening the limiting force of the annular limiting device 4.

[0048] In this embodiment, the elastic pushing device includes a slide 12, a screw 13, a first elastic support member 14, a gear 15, a gear seat 16, a gear ring 17, a lever 18, a connecting rod 19, and a pin 20. The slide 12 is installed on the annular limiting device 4 along the vertical sliding direction. The slide 12 can slide along the vertical direction. At the same time, a T-shaped protrusion is installed on the slide 12, which can slide and cooperate with the annular limiting device 4 to play a limiting role. The upper end of the slide 12 is fixedly connected to the screw 13, the screw 13 extends along the vertical direction, the screw 13 cooperates with the inner ring thread of the gear 15, the gear 15 is connected to the annular limiting device 4 through the gear seat 16, the first elastic support member 14 is installed between the gear seat 16 and the slide 12, the gear 15 is meshed with the gear ring 17, the lower end of the gear ring 17 is fixedly connected to the lever 18, the lever 18 is connected to the pin 20 through the connecting rod 19, and the pin 20 is connected to the radial pressure block 11.

[0049] Specifically, when the upper end of the first jack 5 is in contact with the bottom of the slide 12, after the first jack 5 is lifted, the slide 12 can be driven to move upward, and the displacement of the slide 12 along the vertical direction can drive the gear 15 to rotate under the action of the thread, and the meshing action of the gear 15 can drive the ring gear 17 to rotate. After the ring gear 17 rotates, it acts on the pin 20 through the lever 18 and the connecting rod 19, so as to play the role of pushing the radial pressure block 11. Specifically, the present invention also installs a support 21 on the connecting rod 19, and a guide rod 22 is slidably installed in the support 21. One end of the guide rod 22 is connected to the pin 20. A second elastic support member 23 is installed between the pin 20 and the support 21, and the pin 20 is also installed in a guide groove 24 opened on the connecting rod 19. When the support 21 pushes the pin 20, the middle is elastically supported by the second elastic support member 23, which can play the role of elastic compression. The elastic compression method can not only strengthen the force, but also reduce the damage caused by the radial pressing block 11 to the surface of the concrete component 1.

[0050] In the embodiment of the present invention, both the first elastic support member 14 and the second elastic support member 23 use support springs, which not only facilitates installation but also can cope with harsh on-site environments and improve the service life and stability of the device.

[0051] In this embodiment, the gear seat 16 is connected to the annular limiting device 4 through the annular mounting seat 25, and a slot is formed on the annular mounting seat 25 to cooperate with the gear ring 17, and a ball 26 is installed inside the slot to support the gear ring 17. By providing the ball 26, the gear ring 17 can be supported to ensure the stability of the gear ring 17 during the rotation process.

[0052] In this embodiment, a wedge block 27 is slidably installed on the inner side of the annular limiting device 4. When installing, the wedge block 27 is slidably installed in the slide groove 28 provided on the inner side of the annular limiting device 4, with the wedge surface of the wedge block 27 facing outward. A limiting pin 29 is fixed on the inner side of the annular limiting device 4, and a limiting member 30 is installed on the limiting pin 29. The limiting pin 29 is slidably arranged in the stepped groove 31 provided on the wedge block 27, and the radial direction of the wedge block 27 is limited by the limiting member 30. By providing the wedge block 27, when the annular limiting device 4 is displaced toward the side away from the first jack 5 under the action of the first jack 5, the annular limiting device 4 can act on the wedge surface of the wedge block 27, so that the wedge block 27 can be tightly pressed against the surface of the concrete member 1, thereby increasing the fastening effect of the device and reducing the possibility of the annular limiting device 4 loosening or falling off.

[0053] When in use, by setting a limit pin 29, it can be used to guide the wedge block 27 or the annular limit device 4 when they slide axially. At the same time, the limit member 30 adopts a nut to limit the wedge block 27 from escaping radially, so that the wedge block 27 can be used normally with the annular limit device 4 next time without frequent disassembly and installation.

[0054] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for removing temporary supports of existing concrete components, characterized in that: The following steps are involved: Step 1: Marking according to preset segmentation positions, marking vertically on the surface of the concrete component, and dividing the existing concrete component into multiple concrete segments from bottom to top to facilitate cutting operations; Step 2, cutting the first end face slit of the first concrete segment starting from the lower end; Step 3: Install two annular limiting devices on the concrete member at intervals, the two annular limiting devices are symmetrically arranged at both ends of the first concrete segment, and the annular limiting devices are fastened to the concrete member; Step 4: Install a first jack between the two annular limit devices, use the lower concrete member as support, and start the first jack to lift the upper concrete member to expose the first end face cut; Step 5, cutting the second end surface seam of the first concrete segment; Step 6, lifting the first concrete segment from its original position and trimming the two cut end surfaces of the original concrete component; Step 7: Install a second jack between the two cut end faces, the second jack is used to support the upper concrete member, and disassemble the two annular limit devices; Step 8, repeating steps 2 to 7 to complete the removal of all concrete segments; The annular limiting device comprises a first limiting ring and a second limiting ring, one end of the first limiting ring is hinged to one end of the second limiting ring, and the other end of the first limiting ring and the other end of the second limiting ring are connected by a locking member. When installing, the first limiting ring and the second limiting ring are combined and encircled on the outside of the concrete component; Before supporting, a radial pressing block is installed on the annular limiting device, one end of the radial pressing block is hinged to the annular limiting device, and the other end of the radial pressing block is connected to the annular limiting device through an elastic pushing device; The elastic pushing device includes a sliding seat, a screw, a first elastic support member, a gear, a gear seat, a gear ring, a shift rod, a connecting rod, and a pin. The sliding seat is installed on the annular limiting device along the vertical sliding. The upper end of the sliding seat is fixedly connected to the screw, and the screw is matched with the inner ring thread of the gear. The gear is connected to the annular limiting device through the gear seat. The first elastic support member is installed between the gear seat and the sliding seat, the gear is meshed with the gear ring, and the lower end of the gear ring is fixedly connected to the shift rod, the shift rod is connected to the pin through the connecting rod, and the pin is connected to the radial pressure block.

2. A method for removing temporary supports of existing concrete components according to claim 1, characterized in that: A support is installed on the connecting rod, a guide rod is slidably installed in the support, one end of the guide rod is connected to the pin shaft, a second elastic support member is installed between the pin shaft and the support, and the pin shaft is also installed in a guide groove opened on the connecting rod.

3. The method for removing temporary supports of existing concrete components according to claim 1, characterized in that: The gear seat is connected to the annular limiting device through an annular mounting seat, and a groove matching with the gear ring is formed on the annular mounting seat, and a ball bearing supporting the gear ring is installed inside the groove.

4. A method for removing temporary supports of existing concrete components according to any one of claims 1 to 3, characterized in that: The wedge block is slidably installed on the inner side of the annular limit device. During the specific installation, the wedge block is slidably installed in the sliding groove opened on the inner side of the annular limit device, with the wedge surface of the wedge block facing outward. A limit pin is fixed on the inner side of the annular limit device, and a limit piece is installed on the limit pin. The limit pin is slidably arranged in the stepped groove opened on the wedge block, and the wedge block is limited radially by the limit piece.

Images