Supporting device for underneath pass existing building construction

Abstract

The utility model discloses a supporting device for underneath pass existing building construction, relates to the technical field of building construction, and solves the technical problem that a supporting device for underneath pass existing building construction in the prior art is inconvenient to disassemble and assemble. The supporting device for underneath pass existing building construction comprises a first section; the second section is sleeved outside the first section in a sliding manner along the first direction; the driving part is mounted between the first section and the second section and is used for driving the second section to slide; and the fixing assembly is installed between the first section and the second section and used for fixing the second section. Through the arrangement of the fixing device, when the supporting device needs to be dismantled, the supporting device can be dismantled only by opening the fixing device to enable the first section to slide towards the direction close to the second section, a jack does not need to be used, and therefore the supporting device for underneath pass existing building construction is more convenient to disassemble and assemble and higher in safety.

Description

Technical Field

[0001] This utility model belongs to the field of building construction technology, and specifically relates to a support device for construction under existing buildings. Background Technology

[0002] With the rapid development of urban construction, the development and utilization of underground space is receiving increasing attention. During construction, it is common to encounter situations where existing buildings and structures are tunneled underground using the shallow-buried cut-and-cover method. This process inevitably impacts existing structures, causing vertical settlement and horizontal displacement, and in severe cases, cracking, deformation, or even collapse. Therefore, various measures are employed during the cut-and-cover excavation process, such as steel arch frames, anchor mesh spraying, steel pipe columns, and reinforced concrete columns, to reduce the net deformation of the excavated space, minimize surface settlement, and avoid adverse effects on existing buildings and structures.

[0003] Currently, there are two methods for erecting steel pipe column supports during the construction of tunnels under existing buildings. One method involves installing a fixed hydraulic jack at the top of the steel pipe column, which continuously bears the load. However, prolonged heavy loads on the hydraulic jack may lead to oil leaks, damage to the sealing gaskets, or even jack bursting, causing serious accidents. The other method involves applying vertical prestress to the steel pipe column using the jack, and adjusting the elevation of the steel pipe column with steel wedges or steel plates to ensure the support is effective. However, this method requires the use of hydraulic jacks for dismantling, making it inconvenient for assembly and disassembly. Utility Model Content

[0004] This utility model provides a support device for construction under existing buildings, which solves the technical problem that the support device for construction under existing buildings in the prior art is not easy to disassemble and assemble.

[0005] This utility model is achieved through the following technical solution:

[0006] A support device for construction under existing buildings, comprising:

[0007] First paragraph;

[0008] The second segment can be slidably fitted over the first segment along the first direction;

[0009] A driving component is installed between the first segment and the second segment, and the driving component is used to drive the second segment to slide.

[0010] A fixing component is installed between the first segment and the second segment, the fixing component being used to fix the second segment.

[0011] Furthermore, the second paragraph includes:

[0012] Connecting plate;

[0013] A steel pipe, one end of which is fixedly installed on the connecting plate;

[0014] An mounting plate is fixedly installed at the other end of the steel pipe. The mounting plate has a through hole, through which the first section is slidably installed inside the steel pipe.

[0015] Furthermore, the first paragraph includes:

[0016] First rectangular tube;

[0017] The base plate is fixedly installed at one end of the first rectangular tube.

[0018] Furthermore, it also includes a positioning component installed inside the steel pipe, the positioning component being used to prevent the first segment from rotating within the second segment, the positioning component comprising:

[0019] The second rectangular tube is disposed inside the steel pipe, and the first rectangular tube is slidably inserted into the second rectangular tube;

[0020] Multiple connecting blocks are provided, with one end of each connecting block fixedly installed on the outer wall of the second rectangular tube and the other end of each connecting block fixedly installed on the inner wall of the steel pipe.

[0021] Furthermore, it also includes a reinforcing plate, with both ends fixedly installed on the two opposite inner side walls of the second rectangular tube, and grooves adapted to the reinforcing plate are provided on the opposite side walls of the first rectangular tube.

[0022] Furthermore, the fixing component includes:

[0023] There are two first wedge blocks, both of which are installed on the floor. The wedge surfaces of the two first wedge blocks are set away from each other, and the two first wedge blocks are set one-to-one with the two sliding grooves.

[0024] There are two second wedge blocks, both of which are installed on the side of the mounting plate near the bottom plate. The two second wedge blocks correspond one-to-one with the two first wedge blocks, and the wedge surface of the second wedge block is opposite to the wedge surface of the corresponding first wedge block.

[0025] The adjusting block has an isosceles trapezoidal longitudinal section. There are two adjusting blocks, which are respectively arranged on opposite sides of the first rectangular tube and correspond one-to-one with the two second wedge blocks. The two inclined surfaces of the adjusting block are respectively in contact with the wedge surfaces of the corresponding first wedge block and the second wedge block.

[0026] The screw has a first through hole and a second through hole respectively on the two adjusting blocks. The axes of the first through hole and the second through hole are on the same straight line. One end of the screw passes through the first through hole and the two sliding grooves and is slidably inserted into the second through hole.

[0027] Two nuts are provided, and each nut is screwed onto one end of the screw rod.

[0028] Furthermore, there are two reinforcing plates, which are installed at intervals along the second direction inside the second rectangular tube. The first rectangular tube has grooves on both opposite sides that are adapted to the two reinforcing plates.

[0029] Furthermore, there are two screws, and the two adjusting blocks are respectively provided with two first through holes and two second through holes, and the two screws are respectively slidably inserted into the two first through holes and the two second through holes.

[0030] Furthermore, it also includes:

[0031] A monitoring tube is connected to the end of the second section furthest from the first section;

[0032] An axial force gauge is installed inside the monitoring cylinder and is used to detect the force applied.

[0033] Furthermore, the driving component is a jack.

[0034] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0035] The support device for construction under existing buildings provided by this utility model includes a first section, a second section, a driving component, and a fixing component. The second section can be slidably fitted onto the first section along a first direction. The driving component is installed between the first and second sections and is used to drive the second section to slide. The fixing component is installed between the first and second sections and is used to fix the second section. With the above structure, when excavating under existing buildings, the support device for construction under existing buildings provided by this utility model is erected on the foundation of the excavated section of the tunnel. According to the required height, a standard section of steel pipe column is connected to the support device. Then, the driving component drives the second section to slide upward, pre-applying axial force to the steel pipe column. When the pre-applied axial force design value is reached, the fixing component locks the second section to support the steel pipe column, and then the driving component is reset. When it is necessary to dismantle the support device, simply open the fixing component and slide the first section towards the second section to dismantle the support device without the need for jacks. Therefore, the setting of the fixing component makes the support device for construction under existing buildings provided by this utility model easier to assemble and disassemble and safer. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 A structural schematic diagram of a support device for construction under existing buildings provided in an embodiment of this utility model;

[0038] Figure 2 Another structural schematic diagram of the support device for construction under existing buildings provided in this embodiment of the utility model;

[0039] Figure 3 Another structural schematic diagram of the support device for construction under existing buildings provided in this embodiment of the utility model;

[0040] Figure 4 A schematic diagram of the installation structure of the second segment and the positioning component provided in an embodiment of this utility model;

[0041] Figure 5 This is a schematic diagram of the installation structure of the first segment and the first wedge block provided for an embodiment of the present utility model.

[0042] The attached diagram shows the markings and corresponding component names:

[0043] 1-First section, 11-First rectangular cylinder, 111-Slide groove, 12-Base plate, 2-Second section, 21-Connecting plate, 22-Steel pipe, 23-Mounting plate, 3-Jack, 4-Fixing component, 41-First wedge block, 42-Second wedge block, 43-Adjusting block, 44-Screw, 45-Nut, 5-Positioning component, 51-Second rectangular cylinder, 52-Connecting block, 53-Reinforcing plate, 6-Monitoring cylinder, 7-Axis force gauge. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0045] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly or indirectly attached to that other component. When a component is referred to as being "connected to" another component, it can be directly or indirectly connected to that other component.

[0046] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0047] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] Example:

[0049] This embodiment provides a support device for construction under existing buildings, addressing the technical problem in existing technologies where support devices for tunneling under existing buildings are difficult to assemble and disassemble. The support device includes a first section 1, a second section 2, a driving component, and a fixing assembly 4, wherein:

[0050] The first section 1 was erected between the foundation of the already excavated section and the steel pipe 22 columns during the construction process.

[0051] The second segment 2 can be slidably fitted outside the first segment 1 along the first direction, which is the axial direction of the first segment 1. In this way, the length of the first segment 1 extending out of the second segment 2 can be easily adjusted as needed by the sliding installation of the second segment 2.

[0052] The driving component is installed between the first segment 1 and the second segment 2. The driving component is used to drive the second segment 2 to slide. In this way, the setting of the driving component makes it easy to drive the second segment 2 to slide up and down on the first segment 1.

[0053] The fixing component 4 is installed between the first section 1 and the second section 2. The fixing component 4 is used to fix the second section 2. In this way, after the position of the second section 2 is determined by the fixing component 4, the second section 2 is fixed by the fixing component 4 to support the steel pipe 22 column, thereby achieving the purpose of supporting the existing building.

[0054] With the above structure, when excavating under an existing building, the support device for construction under an existing building provided by this utility model is erected on the foundation of the excavated section of the tunnel. According to the required height, a standard section of steel pipe 22 is installed on the support device. Then, the second section 2 is driven to slide upward by the driving component, and a pre-load is applied to the steel pipe 22 column. When the pre-load design value is reached, the second section 2 is locked by the fixing component 4 to support the steel pipe 22 column, and then the driving component is reset. When it is necessary to dismantle the support device, simply open the fixing device and let the first section 1 slide towards the second section 2 to dismantle the support device without using the jack 3. Therefore, the setting of the fixing device makes the support device for construction under an existing building provided by this utility model easier to dismantle and install, and safer.

[0055] An optional implementation of this embodiment is as follows: The second segment 2 includes a connecting plate 21, a steel pipe 22, and a mounting plate 23, wherein:

[0056] The connecting plate 21 is used to connect the steel pipe 22 column.

[0057] One end of the steel pipe 22 is fixedly installed on the connecting plate 21. The connecting plate 21 is an annular plate made of steel, and the inner diameter of the connecting plate 21 is equal to the inner diameter of the steel pipe 22. In this way, the second section 2 can be easily connected to an external object through the setting of the connecting plate 21.

[0058] Mounting plate 23 is fixedly installed at the other end of steel pipe 22. A through hole is provided on mounting plate 23. The first section 1 is slidably installed in steel pipe 22 through the through hole. Optionally, mounting plate 23 is also a structural component made of steel.

[0059] An optional implementation of this embodiment is as follows: The first segment 1 includes a first rectangular tube 11 and a base plate 12, wherein:

[0060] The first rectangular tube 11 is a tube with a rectangular cross-section.

[0061] The base plate 12 is fixedly installed at one end of the first rectangular tube 11. Optionally, the first rectangular tube 11 and the base plate 12 can be connected together by welding, bonding or hot melting. Of course, they can also be integrally formed.

[0062] An optional implementation of this embodiment is as follows: It further includes a positioning component 5, installed inside the steel pipe 22. The positioning component 5 is used to prevent the first segment 1 from rotating within the second segment 2. The positioning component 5 includes a second rectangular tube 51 and a connecting block 52, wherein:

[0063] The second rectangular tube 51 is disposed inside the steel pipe 22, and the first rectangular tube 11 is slidably inserted into the second rectangular tube 51. The straight line where the center of the second rectangular tube 51 is located coincides with the axis of the steel pipe 22. In this way, the first segment 1 and the second segment 2 are subjected to uniform force, reducing the probability that the first segment 1 and the second segment 2 provided in this utility model embodiment will be damaged due to uneven force.

[0064] There are multiple connecting blocks 52. One end of each connecting block 52 is fixedly installed on the outer wall of the second rectangular tube 51, and the other end of each connecting block 52 is fixedly installed on the inner wall of the steel pipe 22. The second rectangular tube 51 is fixedly installed inside the steel pipe 22 by the setting of the connecting blocks 52. In this way, the cooperation between the first rectangular tube 11 and the second rectangular tube 51 prevents the second segment 2 from rotating on the first segment 1. Moreover, the setting of multiple connecting blocks 52 makes the connection between the second rectangular tube 51 and the steel pipe 22 more stable.

[0065] Optionally, there are four connecting blocks 52. The four connecting blocks 52 are evenly distributed on opposite sides of the second rectangular tube 51. That is, any two of the four connecting blocks 52 are first connecting blocks 52. One end of the two first connecting blocks 52 is installed on one side of the second rectangular tube 51, and the other end of the two first connecting blocks 52 is installed on the inner wall of the steel pipe 22. The remaining two connecting blocks 52 are second connecting blocks 52. One end of the two second connecting blocks 52 is installed on one side of the second rectangular tube 51 and is symmetrically arranged with the two first connecting blocks 52. The other end of the two second connecting blocks 52 is installed on the inner wall of the steel pipe 22. In this way, the evenly distributed connecting blocks 52 make the force on the steel pipe 22 more uniform.

[0066] An optional implementation of this embodiment is as follows: It also includes a reinforcing plate 53, which is fixedly installed at both ends on the two opposite inner side walls of the second rectangular tube 51. The opposite side walls of the first rectangular tube 11 are provided with sliding grooves 111 that are adapted to the reinforcing plate 53. In this way, by setting the reinforcing plate 53, the structure of the second rectangular tube 51 is made more robust, thereby increasing the load of the second rectangular tube 51. By setting the sliding grooves 111, the reinforcing plate 53 is prevented from hindering the sliding of the first rectangular tube 11 inside the second rectangular tube 51.

[0067] An optional implementation of this embodiment is as follows: The fixing component 4 includes a first wedge block 41, a second wedge block 42, an adjusting block 43, a screw 44, and a nut 45, wherein:

[0068] There are two first wedge blocks 41, both of which are installed on the base plate 12. The wedge surfaces of the two first wedge blocks 41 are set away from each other, and the two first wedge blocks 41 are set in a one-to-one correspondence with the two sliding grooves 111.

[0069] There are two second wedge blocks 42, both of which are installed on the side of the mounting plate 23 near the base plate 12. The two second wedge blocks 42 are arranged in a one-to-one correspondence with the two first wedge blocks 41, and the wedge surface of the second wedge block 42 is arranged opposite to the wedge surface of the corresponding first wedge block 41.

[0070] Optionally, both the first wedge block 41 and the second wedge block 42 are triangular prisms with a right-angled triangular cross-section. The two mutually perpendicular sides of the first wedge block 41 are respectively attached to the side walls of the base plate 12 and the first rectangular tube 11, and the remaining side is a wedge surface. The two mutually perpendicular sides of the second wedge block 42 are respectively attached to the side walls of the mounting plate 23 and the first rectangular tube 11, and the remaining side is a wedge surface.

[0071] The longitudinal section of the adjusting block 43 is an isosceles trapezoid, that is, the adjusting block 43 is an isosceles trapezoidal block. There are two adjusting blocks 43. The two adjusting blocks 43 are respectively set on the two sides opposite to the first rectangular tube 11 and are respectively set with the two second wedge blocks 42. The two inclined surfaces of the adjusting block 43 are respectively attached to the wedge surfaces of the corresponding first wedge block 41 and second wedge block 42. Specifically, the two first wedge blocks 41, the two second wedge blocks 42 and the two adjusting blocks 43 are respectively located on the two sides of the first rectangular tube 11. The two inclined surfaces of any adjusting block 43 are respectively attached to the wedge surfaces of the first wedge block 41 and the second wedge block 42 located on the same side of the first rectangular tube 11.

[0072] Two adjusting blocks 43 are respectively provided with a first through hole and a second through hole. The axes of the first through hole and the second through hole are on the same straight line. One end of the screw 44 passes through the first through hole and the two sliding grooves 111 and is slidably inserted into the second through hole.

[0073] There are two nuts 45, which are screwed onto both ends of the screw rod 44 respectively.

[0074] With the above structure, after the driving component drives the second segment 2 to the set position, it first pushes the two adjusting blocks 43 to move towards each other, so that the two adjusting blocks 43 gradually move upward on the wedge surfaces of the two first wedge blocks 41, and at the same time drives the screw 44 to move upward in the two sliding grooves 111 until the two adjusting blocks 43 are respectively in contact with the wedge surfaces of the corresponding second wedge blocks 42. The sliding grooves 111 prevent the two adjusting blocks 43 from shifting during the upward movement. Then, the two nuts 45 are tightened to fix the two adjusting blocks 43 on the screw 44, so that the two nuts 45 rotate towards the direction of the corresponding adjusting block 43, so that the two adjusting blocks 43 are respectively supported between the corresponding first wedge blocks 41 and second wedge blocks 42, thereby achieving the purpose of fixing the second segment 2. Finally, the driving component is reset. When it is necessary to disassemble this utility model embodiment, When using the support device provided for construction under existing buildings, simply loosen the nuts 45 so that the two nuts 45 rotate away from the corresponding adjusting blocks 43. Due to the wedge surface of the wedge block and the inclined surface of the adjusting block 43, the two adjusting blocks 43 slide downward along the wedge surface of the wedge block under their own weight, that is, the two adjusting blocks 43 move away from each other. At the same time, the screws 44 connected to the two adjusting blocks 43 slide downward in the slide groove 111 until the two adjusting blocks 43 slide to the bottom of the first wedge block 41. Then tighten the two nuts 45 to prevent the two adjusting blocks 43 from falling off the screws 44. In this way, as the two adjusting blocks 43 slide downward, the force supporting the second section 2 disappears, and the second section 2 gradually moves towards the first section 1 until the connecting plate 21 is in contact with the top of the driving component, thereby achieving the purpose of removing the support device.

[0075] Optionally, there are two reinforcing plates 53. The two reinforcing plates 53 are installed at intervals in the second rectangular tube 51 along the second direction. Two grooves 111 adapted to the reinforcing plates 53 are opened on both sides of the first rectangular tube 11. In this way, the structure of the second rectangular tube 51 is made more robust by setting two reinforcing plates 53.

[0076] Optionally, there are also two screws 44. Two first through holes and two second through holes are respectively opened on the two adjusting blocks 43. The two screws 44 are slidably inserted into the two first through holes and the two second through holes respectively. It should be noted that at least one nut 45 is screwed to both ends of each screw 44. In this way, by setting two screws 44, the two adjusting blocks 43 can be fixed more firmly.

[0077] An optional implementation of this embodiment is as follows: it further includes a monitoring cylinder 6 and an axial force gauge 7, wherein:

[0078] The monitoring cylinder 6 is connected to the end of the second section 2 away from the first section 1. Optionally, the monitoring cylinder 6 can be detachably installed on the second section 2.

[0079] An axial force gauge 7 is installed inside the monitoring cylinder 6. The axial force gauge 7 is used to detect the force. Specifically, the monitoring cylinder 6 has a telescopic function. The axial force gauge 7 is placed inside the monitoring cylinder 6, and one end of the axial force gauge 7 is on the same horizontal plane as the end face of the monitoring cylinder 6 away from the first section 1. When using the support device for construction under existing buildings provided in this embodiment of the present invention, a standard section steel pipe 22 column is connected between the monitoring cylinder 6 and the second section 2. The axial force gauge 7 is used to detect the force on the standard section steel pipe 22 column. When the axial force gauge 7 detects that the axial force on the steel pipe 22 column increases, the support axial force of the support device for construction under existing buildings provided in this embodiment of the present invention is adjusted again. In this way, by setting the axial force gauge 7, the axial force on the steel pipe 22 column is monitored in real time, thereby adjusting the support axial force of the support device in real time to limit and correct the settlement deformation of the existing building.

[0080] An optional implementation of this embodiment is as follows: the driving component is a jack 3, which can provide powerful lifting force, is easy to operate and has a robust structure.

[0081] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A support device for construction under existing buildings, characterized in that, include: First paragraph (1); The second segment (2) can be slidably fitted outside the first segment (1) along the first direction; A driving element is installed between the first segment (1) and the second segment (2), and the driving element is used to drive the second segment (2) to slide; A fixing component (4) is installed between the first segment (1) and the second segment (2), the fixing component (4) being used to fix the second segment (2).

2. The support device for construction under existing buildings according to claim 1, characterized in that, The second paragraph (2) includes: Connecting plate (21); A steel pipe (22) is fixedly installed at one end on the connecting plate (21); The mounting plate (23) is fixedly installed at the other end of the steel pipe (22). The mounting plate (23) has a through hole, and the first section (1) is slidably installed in the steel pipe (22) through the through hole.

3. The support device for construction under existing buildings according to claim 2, characterized in that, The first segment (1) includes: First rectangular tube (11); The base plate (12) is fixedly installed at one end of the first rectangular tube (11).

4. A support device for construction under existing buildings according to claim 3, characterized in that, It also includes a positioning component (5) installed inside the steel pipe (22), the positioning component (5) being used to prevent the first segment (1) from rotating within the second segment (2), the positioning component (5) comprising: The second rectangular tube (51) is disposed inside the steel pipe (22), and the first rectangular tube (11) is slidably inserted into the second rectangular tube (51); There are multiple connecting blocks (52), one end of which is fixedly installed on the outer side wall of the second rectangular tube (51), and the other end of which is fixedly installed on the inner side wall of the steel pipe (22).

5. A support device for construction under existing buildings according to claim 4, characterized in that, It also includes a reinforcing plate (53), which is fixedly installed on the two inner side walls of the second rectangular tube (51) at both ends. The two side walls of the first rectangular tube (11) are provided with grooves (111) that are adapted to the reinforcing plate (53).

6. A support device for construction under existing buildings according to claim 5, characterized in that, The fixing component (4) includes: There are two first wedge blocks (41), both of which are installed on the base plate (12). The wedge surfaces of the two first wedge blocks (41) are set away from each other, and the two first wedge blocks (41) are set one-to-one with the two sliding grooves (111). There are two second wedge blocks (42), both of which are installed on the side of the mounting plate (23) near the bottom plate (12). The two second wedge blocks (42) are arranged in a one-to-one correspondence with the two first wedge blocks (41), and the wedge surface of the second wedge block (42) is arranged opposite to the wedge surface of the corresponding first wedge block (41). Adjustment block (43), the longitudinal section of the adjustment block (43) is an isosceles trapezoid, there are two adjustment blocks (43), the two adjustment blocks (43) are respectively set on opposite sides of the first rectangular tube (11), and are respectively set with the two second wedge blocks (42), and the two inclined surfaces of the adjustment block (43) are respectively in contact with the wedge surfaces of the corresponding first wedge block (41) and the second wedge block (42); The screw (44) and the two adjusting blocks (43) are respectively provided with a first through hole and a second through hole. The axes of the first through hole and the second through hole are on the same straight line. One end of the screw (44) passes through the first through hole and slides into the second through hole through the two sliding grooves (111). Nuts (45), two in number, are screwed onto the two ends of the screw (44) respectively.

7. A support device for construction under existing buildings according to claim 6, characterized in that, The number of the reinforcing plates (53) is two, and the two reinforcing plates (53) are installed at intervals in the second rectangular tube (51) along the second direction. The first rectangular tube (11) has grooves (111) on both sides that are adapted to the two reinforcing plates (53).

8. A support device for construction under existing buildings according to claim 7, characterized in that, There are also two screws (44). The two adjusting blocks (43) have two first through holes and two second through holes respectively. The two screws (44) are slidably inserted into the two first through holes and the two second through holes respectively.

9. A support device for construction under existing buildings according to claim 1, characterized in that, Also includes: The monitoring tube (6) is connected to the end of the second segment (2) away from the first segment (1); An axial force gauge (7) is installed inside the monitoring cylinder (6) and is used to detect the force.

10. A support device for construction under existing buildings according to any one of claims 1-9, characterized in that, The driving component is a jack (3).

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