Servo inclined throwing support system and basement structure transformation construction method

Abstract

According to the servo inclined throwing support system and the basement structure transformation construction method, the supporting axial force can be automatically adjusted through the servo inclined throwing support to adapt to various basement transformation working conditions, the construction flexibility is improved, meanwhile, the requirement for accurately controlling structural deformation is met, and the basement structure disassembly and transformation safety is improved. The added inclined throwing support compensation axial force adopts graded loading, the horizontal displacement monitoring data of the basement outer wall structure are collected, an oil hydraulic pump of a servo oil jack is adjusted by a computer to automatically increase or relieve pressure to a set value, and the purpose of adjusting and compensating horizontal deformation displacement is achieved. Due to the fact that the servo supporting system is flexible in arrangement and efficient and convenient to install and dismantle, the system can be suitable for local single-layer structure transformation and multi-layer basement structure transformation of different depths from top to bottom or from bottom to top, horizontal displacement monitoring data of the basement outer wall structure can be automatically collected through a computer, and the data are analyzed through the computer; the purpose of automatically compensating servo axial force to control deformation can be achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of building engineering, in particular to a servo inclined throw bracing system and a basement structure reconstruction construction method. BACKGROUND

[0002] In the traditional basement reconstruction method, in order to prevent the basement outer wall from deforming, tilting, and losing stability due to the lateral pressure after the horizontal structure is removed, a knife wall or an ordinary steel pipe inclined throw bracing is often used as a reinforcing measure. For the existing basement with a small depth and a small deformation requirement of the surrounding pipeline, the traditional reconstruction construction method can still meet the use requirements, but there are still problems such as long construction period, high cost, time-consuming and laborious removal, and uncontrollable influence on the structure deformation of the ordinary steel pipe inclined throw bracing. However, for the reconstruction conditions such as the basement with a large depth, the obvious change of the underground pipeline to the pressure, and the complex site conditions requiring common construction and reverse construction, the traditional method is difficult to construct, and the basement outer wall structure deformation cannot be controlled according to the working conditions. SUMMARY

[0003] The purpose of the present application is to provide a servo inclined throw bracing system and a basement structure reconstruction construction method.

[0004] To solve the above problems, the present application provides a servo inclined throw bracing system, comprising:

[0005] an inclined throw bracing;

[0006] a servo oil top arranged at one end of the inclined throw bracing;

[0007] a concrete corbel arranged on a structure bottom plate, and a base of the servo oil top abutting against the concrete corbel;

[0008] an inner lining wall arranged on a side wall of a basement outer wall, and a surrounding purlin arranged at an upper portion of the inner lining wall;

[0009] an inclined support counter corbel connected to a side surface of the surrounding purlin, and the other end of the inclined throw bracing being connected to the inclined support counter corbel.

[0010] Further, in the above system, the inclined throw bracing comprises:

[0011] a middle pipe;

[0012] a fixed end connected to one end of the middle pipe, and a head of the fixed end abutting against the inclined support counter corbel;

[0013] an active end head arranged at the other end of the middle pipe, and a gap between the middle pipe and the active end head being limited by inserting a wedge after the active end head slides to a suitable position along the axial direction of the middle pipe.

[0014] Further, in the system, the top elevation of the surrounding purlin and the inclined support counter-strap is consistent with the elevation of the reconstructed new horizontal structure of the floor.

[0015] Further, in the system, the servo oil top is arranged in the movable end.

[0016] Further, in the system, the steel bars of the inclined support counter-strap are connected with the reconstructed new horizontal structure of the floor in a pre-buried manner.

[0017] According to another aspect of the present application, there is also provided a basement structure reconstruction construction method using the servo inclined throw support system according to any one of the above aspects, the method comprising:

[0018] Step 1: first, an inner lining wall is formed by inversely forming an enlarged section of the basement outer wall of the zone Bn+2F floor, and a surrounding purlin on the inner lining wall is simultaneously constructed; an inclined support counter-strap is arranged on the side of the surrounding purlin, a concrete counter-strap is arranged on the structure bottom plate, the top end of the inclined throw support is abutted against the inclined support counter-strap, and the lower part of the inclined throw support is connected with the base of the servo oil top abutted against the concrete counter-strap;

[0019] Step 2: after the concrete strength of the inner lining wall reaches the requirement, the servo oil top of the inclined throw support of the Bn+2F floor is gradually loaded to the design axial force on the basement outer wall according to the horizontal displacement monitoring data of the basement outer wall;

[0020] Step 3: after the horizontal displacement monitoring data of the basement outer wall is stable, the original structure beam plate of the Bn+1F floor is started to be demolished; during the demolition of the original structure beam plate, the axial force change monitoring of the inclined throw support of the Bn+2F floor is strengthened;

[0021] Step 4: after the original structure beam plate of the Bn+1F floor is demolished, the new horizontal structure of the Bn+1F floor is back-built, and the concrete counter-strap, the inner lining wall, the surrounding purlin and the inclined support counter-strap of the Bn+1F floor are simultaneously constructed during the back-building; the inclined throw support and the servo oil top of the Bn+1F floor are installed;

[0022] Step 5: after the concrete strength of the inner lining wall reaches the requirement, the servo oil top of the inclined throw support of the Bn+1F floor is gradually loaded to the design axial force on the basement outer wall according to the horizontal displacement monitoring data of the basement outer wall;

[0023] Step 6: after the horizontal displacement monitoring data of the basement outer wall is stable, the original structure beam plate of the BnF floor is demolished in the same way as that in Step 3, and thus the multi-layer basement structure demolition and reconstruction construction is completed.

[0024] Furthermore, in the above method, step 2: after the concrete strength of the inner lining wall reaches the required level, based on the horizontal displacement monitoring data of the basement exterior wall, the basement exterior wall is gradually loaded to the design axial force through the servo hydraulic jack of the inclined bracing on the Bn+2F floor, including:

[0025] When the daily variation of horizontal displacement deformation of the basement exterior wall at the location corresponding to the inclined brace is greater than 2mm or the cumulative deformation is greater than 10mm, the axial force is actively adjusted by the servo hydraulic jack.

[0026] Furthermore, in the above method, during the process of actively adjusting the axial force through the servo hydraulic jack, the increased compensating axial force is applied in stages, with each increase not exceeding ±100kN. After the axial force is increased, the corresponding deformation points of the basement exterior wall are measured within 4 to 6 hours. If the deformation converges, the axial force is stopped.

[0027] Furthermore, in the above method, during the demolition of the original structural beams and slabs, the monitoring of axial force changes in the inclined bracing of the Bn+2F layer is strengthened, including:

[0028] When the actual working pressure of the inclined boom changes by more than ±50kN, the hydraulic pump of the computer-controlled servo hydraulic jack will automatically pressurize or depressurize to the set value.

[0029] Compared with existing technologies, this invention can solve the problem of increased construction period and cost caused by the inability to balance forward and reverse construction methods during the demolition and renovation of existing basement structures, as well as the problem that underground pipelines or basement structures are sensitive to structural deformation during the demolition and renovation process, requiring precise control of lateral pressure.

[0030] This invention provides a basement structural renovation construction method based on servo-driven inclined bracing. This method can automatically adjust the support axial force through the servo-driven inclined bracing to adapt to various basement renovation conditions, increasing construction flexibility while meeting the requirements for precise control of structural deformation and improving the safety of basement structural demolition and renovation. The axial force compensation of the inclined bracing in this invention adopts a graded loading method. By collecting monitoring data on the horizontal displacement of the basement exterior wall structure, the computer adjusts the hydraulic pump of the servo-driven hydraulic jack to automatically pressurize or depressurize to a set value, achieving the purpose of adjusting and compensating for horizontal deformation displacement. Because the servo support system is flexible in layout and efficient and convenient to install and dismantle, this invention is applicable to partial single-story structural renovations, multi-story basement structural renovations of different depths (top-down or bottom-up), etc. This invention can automatically collect monitoring data on the horizontal displacement of the basement exterior wall structure through computer analysis, achieving the purpose of automatically compensating for deformation through servo axial force control.

[0031] After applying this invention to construction, the flexibility of basement structure demolition and modification is increased, the safety of demolition and modification of basement structures near subway stations using both forward and reverse methods is significantly improved, the average convergence deformation of the structure during demolition and modification is controlled within 2mm, and the subsequent maintenance costs are reduced. Attached Figure Description

[0032] Fig. 1 This is a schematic diagram of a servo-driven inclined projection system according to an embodiment of the present invention;

[0033] Fig. 2 This is a schematic diagram of the configuration of the inclined projection brace according to an embodiment of the present invention;

[0034] Fig. 3 This is a schematic diagram of the basement structure demolition and alteration work according to an embodiment of the present invention. Detailed Implementation

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figs. 1 to 3 As shown, the present invention provides a servo-driven inclined launcher system, comprising:

[0037] 1. Inclined bracing;

[0038] Servo oil top 2 is installed at one end of the inclined boom 1;

[0039] The concrete bracket 3 is installed on the structural base plate 7 (or floor slab), and the base of the servo hydraulic jack rests on the concrete bracket;

[0040] The inner lining wall is set on the side wall of the basement exterior wall, and the waler 6 is set on the upper part of the inner lining wall.

[0041] The inclined support anti-bracing 4 is connected to the side of the waler 6, and the other end of the inclined brace 1 is connected to the inclined support anti-bracing 4.

[0042] Here, the servo inclined bracing system of the present invention can utilize the basement exterior wall to set an inner lining wall 5 and a wall waler 6, set a concrete corbel 3 on the structural base plate (or floor slab) 7, set an inclined support anti corbel 4 at the top of the inclined bracing 1, and set a servo hydraulic jack 2 at the bottom of the inclined bracing 1; after the servo inclined bracing system is installed, the axial force adjustment of the servo hydraulic jack 2 can actively control the lateral deformation of the structure.

[0043] The thrust output by the servo jack cylinder is transmitted in two directions simultaneously, and is ultimately offset by the foundation structure:

[0044] Positive transmission (resisting external wall deformation): hydraulic cylinder → movable end head → inclined bracing main body → inclined support → waler → inner lining wall → basement exterior wall (counteracting external soil pressure);

[0045] Reverse transmission (transfer to foundation bearing): hydraulic cylinder → hydraulic cylinder base → concrete corbel 3 → structural base plate 7 (transfers the reverse pressure to the base structure of the basement, which is borne by the base plate and distributed to the foundation).

[0046] like Fig. 2 As shown, in one embodiment of the servo-driven inclined launcher system of the present invention, the inclined launcher 1 includes:

[0047] Intermediate tube 12;

[0048] A fixed end 1 is connected to one end of the intermediate tube 12, and the fixed end 1 abuts against the inclined support anti-bracing 4;

[0049] The movable end 10 is located at the other end of the intermediate tube 12. After the movable end 10 slides along the axial direction of the intermediate tube 12 to a suitable position, the gap between the intermediate tube 12 and the movable end 10 is limited by the insertion of a wedge block 11.

[0050] Here, the wedge 11 can be a thick iron block.

[0051] The movable end is fitted onto the end of the intermediate tube or embedded inside the intermediate tube. It can slide back and forth along the axial direction (length direction) of the intermediate tube to change the total length of the entire inclined brace and adapt to different support space dimensions. When the movable end slides to the appropriate position, a gap will appear at the connection between the movable end and the intermediate tube. For example, when the movable end is fitted outside the tube, there is a gap between the tube wall and the inner wall of the end; or when it is embedded inside the tube, there is a gap between the end and the tube end. At this time, the wedge (a block with a bevel) is hammered into the gap.

[0052] In one embodiment of the servo-driven inclined support system of the present invention, the top elevation of the waler 6 and the inclined support anti-bracing 4 is consistent with the elevation of the newly built horizontal structure 8 after the renovation of the floor, which can avoid the need for later chiseling and achieve the purpose of permanent and temporary combination.

[0053] In one embodiment of the servo inclined support system of the present invention, a servo hydraulic top 2 is provided inside the movable end 10, and the base of the servo hydraulic top 2 rests against the concrete bracket 3.

[0054] Here, each inclined support 1 includes: a movable end 10, a wedge 11, an intermediate tube 12, and a fixed end 13; the inclined support 4 is connected to the waler 6, the waler 6 is connected to the upper part of the inner lining wall 5, the movable end 10 has a built-in servo hydraulic cap 2, and the movable end 10 has a mechanical self-locking function. The two ends of the intermediate tube 12 are respectively connected to the movable end 10 and the fixed end 13. The fixed end abuts against the anti-bracing 4 of the inclined support, the movable end 10 has a built-in servo hydraulic cap 2, and the base of the servo hydraulic cap 2 abuts against the concrete anti-bracing 3.

[0055] This invention can be used for the demolition and alteration of multi-story or single-story basement structures. The following will describe its application in the basement structure demolition and alteration method. Fig. 3 Taking a bottom-up renovation case as an example, this invention also provides a construction method for basement structural renovation, using the aforementioned servo-driven inclined support system. The method includes:

[0056] Step 1: First, construct the enlarged section of the basement exterior wall of the Bn+2F floor in reverse to form the inner lining wall 5, and simultaneously construct the waler 6 on the inner lining wall 5; set the inclined support anti-corbel 4 on the side of the waler 6, set the concrete corbel 3 on the structural base plate (or floor slab) 7, place the top of the inclined brace 1 against the inclined support anti-corbel 4, and place the base of the servo oil ceiling 2 connected to the lower part of the inclined brace 1 against the concrete corbel 3.

[0057] Step 2: After the concrete strength of the inner lining wall 5 reaches the required level, based on the horizontal displacement monitoring data of the basement exterior wall, the servo hydraulic jack 2 of the inclined bracing 1 of the Bn+2F layer is used to gradually apply the design axial force to the basement exterior wall.

[0058] Preferably, the subsequent adjustment of the axial force of the inclined bracing is based primarily on the deformation monitoring results of the basement exterior wall. When the daily variation of the horizontal displacement deformation of the basement exterior wall at the corresponding location of the inclined bracing is greater than 2mm or the cumulative deformation is greater than 10mm, the axial force is actively adjusted by the servo hydraulic jack 2. More preferably, during the active adjustment of the axial force, the increased compensation axial force is applied in stages, with each increase not exceeding ±100kN. After the axial force is increased, the corresponding deformation points of the basement exterior wall are measured within 4 to 6 hours. If the deformation converges, the axial force is stopped.

[0059] Step 3: After the horizontal displacement monitoring data of the basement exterior wall stabilizes, the demolition of the original structural beams and slabs 9 of the Bn+1F floor begins; during the demolition of the original structural beams and slabs 9, the monitoring of the axial force change of the inclined bracing 1 of the Bn+2F floor is strengthened. When the actual working pressure change of the inclined bracing 1 exceeds ±50kN, the hydraulic pump of the computer-controlled servo hydraulic jack 2 is automatically pressurized or depressurized to the set value.

[0060] Step 4: After the original structural beams and slabs 9 of the Bn+1F layer are demolished, the new horizontal structure 8 of the Bn+1F layer is rebuilt. During the rebuilt construction, the concrete corbels 3, inner lining walls 5, walers 6 and inclined support anti-corbels 4 of the Bn+1F layer are constructed simultaneously; the inclined bracing 1 and servo system hydraulic jack 2 of Bn+1F are installed.

[0061] Here, the reinforcing bars of the inclined support anti-corbel 4 can be pre-embedded and connected to the newly built horizontal structure 8 of the floor after renovation.

[0062] Step 5: After the concrete strength of the inner lining wall 5 reaches the required level, based on the horizontal displacement monitoring data of the basement exterior wall, the servo hydraulic jack 2 of the inclined bracing 1 of the Bn+1F layer is used to gradually apply the design axial force to the basement exterior wall.

[0063] Step 6: After the horizontal displacement monitoring data of the basement exterior wall stabilizes, demolish the original structural beams and slabs 9 of the BnF floor using the same method as in Step 3. This completes the demolition and alteration of the multi-story basement structure.

[0064] This invention is also applicable to the structural demolition and restoration of a partial floor of a multi-story basement, or the demolition and restoration of the roof slab of a single-story basement.

[0065] This invention except Fig. 3 This case study applies not only to the demolition and alteration of multi-story basements from bottom to top, but also to the demolition and alteration of multi-story basements from top to bottom. Starting from the roof slab of the basement to be modified, after completing the roof slab modification according to steps 1 to 4, repeat steps 1 to 4 on the next floor.

[0066] This invention pertains to a servo-driven inclined bracing structure and its supporting construction method for structural demolition and renovation, and relates to the field of building engineering. Specifically, it relates to the demolition and renovation of existing basements. To control the deformation of the basement exterior walls caused by external soil pressure during the large-area horizontal structural demolition and renovation of the basement, a servo-driven inclined bracing system and a complete construction method are designed and implemented to address and reduce the disturbance of structural deformation to the surrounding sensitive environment.

[0067] This invention can solve the problem of increased construction period and cost caused by the inability to balance forward and reverse construction methods during the demolition and renovation of existing basement structures, as well as the problem that underground pipelines or basement structures are highly sensitive to structural deformation during the demolition and renovation process, requiring precise control of lateral pressure.

[0068] This invention provides a basement structural renovation construction method based on servo-driven inclined bracing. This method can automatically adjust the support axial force through the servo-driven inclined bracing to adapt to various basement renovation conditions, increasing construction flexibility while meeting the requirements for precise control of structural deformation and improving the safety of basement structural demolition and renovation. The axial force compensation of the inclined bracing in this invention adopts a graded loading method. By collecting monitoring data on the horizontal displacement of the basement exterior wall structure, the computer adjusts the hydraulic pump of the servo-driven hydraulic jack to automatically pressurize or depressurize to a set value, achieving the purpose of adjusting and compensating for horizontal deformation displacement. Because the servo support system is flexible in layout and efficient and convenient to install and dismantle, this invention is applicable to partial single-story structural renovations, multi-story basement structural renovations of different depths (top-down or bottom-up), etc. This invention can automatically collect monitoring data on the horizontal displacement of the basement exterior wall structure through computer analysis, achieving the purpose of automatically compensating for deformation through servo axial force control.

[0069] After applying this invention to construction, the flexibility of basement structure demolition and modification is increased, the safety of demolition and modification of basement structures near subway stations using both forward and reverse methods is significantly improved, the average convergence deformation of the structure during demolition and modification is controlled within 2mm, and the subsequent maintenance costs are reduced.

[0070] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0071] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0072] Obviously, those skilled in the art can make various modifications and variations to the invention without departing from the spirit and scope of the invention. Therefore, if these modifications and variations fall within the scope of the claims of the invention and their equivalents, the invention is also intended to include these modifications and variations.

Claims

1. A servo-driven inclined projection system, characterized in that, include: Angled brace; A servo hydraulic jack is installed at one end of the inclined boom; The concrete brackets are installed on the structural base plate, and the base of the servo hydraulic cap rests on the concrete brackets. The inner lining wall is set on the side wall of the basement exterior wall, and the waler is set on the upper part of the inner lining wall. The inclined support anti-bracing is connected to the side of the waler, and the other end of the inclined brace is connected to the inclined support anti-bracing.

2. The servo-driven inclined launcher system as described in claim 1, characterized in that, The inclined brace includes: Intermediate pipe; A fixed end connected to one end of the intermediate tube, the fixed end abutting against the anti-bracing of the inclined support; The movable end is located at the other end of the intermediate tube. After the movable end slides along the axial direction of the intermediate tube to a suitable position, the gap between the intermediate tube and the movable end is limited by inserting a wedge.

3. The servo-driven inclined launcher system as described in claim 1, characterized in that, The top elevation of the waler and the anti-corbel of the inclined support is consistent with the elevation of the newly built horizontal structure of the floor after renovation.

4. The servo-driven inclined projection system as described in claim 1, characterized in that, The servo oil cap is provided inside the active end.

5. The servo-driven inclined projection system as described in claim 1, characterized in that, The reinforcing bars of the inclined support anti-corbel are connected to the newly built horizontal structure of the floor by pre-embedding.

6. A construction method for basement structural renovation, characterized in that, The method using the servo-assisted inclined launcher system according to any one of claims 1 to 5 includes: Step 1: First, construct the enlarged section of the basement exterior wall of Bn+2F floor in reverse to form the inner lining wall, and simultaneously construct the walers on the inner lining wall; set the inclined support anti-corbel on the side of the waler, set the concrete corbel on the structural base plate, place the top of the inclined brace against the inclined support anti-corbel, and place the base of the servo oil ceiling connected to the lower part of the inclined brace against the concrete corbel. Step 2: After the concrete strength of the inner lining wall reaches the required level, based on the horizontal displacement monitoring data of the basement exterior wall, the servo hydraulic jack of the inclined bracing of the Bn+2F layer is used to gradually apply the design axial force to the basement exterior wall. Step 3: After the horizontal displacement monitoring data of the basement exterior wall stabilizes, begin the demolition of the original structural beams and slabs of the Bn+1F floor; during the demolition of the original structural beams and slabs, strengthen the monitoring of axial force changes of the inclined bracing of the Bn+2F floor. Step 4: After the original structural beams and slabs of Bn+1F are demolished, the new horizontal structure of Bn+1F is rebuilt. During the rebuilt construction, the concrete corbels, inner lining walls, walers and inclined support anti-corbels of Bn+1F are constructed simultaneously; the inclined bracing and servo-system hydraulic jack of Bn+1F are installed. Step 5: After the concrete strength of the inner lining wall reaches the required level, based on the horizontal displacement monitoring data of the basement exterior wall, the servo hydraulic jack of the inclined bracing of the Bn+1F floor is used to gradually apply the design axial force to the basement exterior wall. Step 6: After the horizontal displacement monitoring data of the basement exterior wall stabilizes, demolish the original structural beams and slabs of the BnF floor using the same method as in Step 3. This completes the demolition and alteration of the multi-story basement structure.

7. The basement structure renovation construction method as described in claim 6, characterized in that, Step 2: After the concrete strength of the inner lining wall reaches the required level, based on the horizontal displacement monitoring data of the basement exterior wall, the servo hydraulic jacks of the inclined bracing on the Bn+2F floor are used to gradually apply load to the basement exterior wall up to the design axial force, including: When the daily variation of horizontal displacement deformation of the basement exterior wall at the location corresponding to the inclined brace is greater than 2mm or the cumulative deformation is greater than 10mm, the axial force is actively adjusted by the servo hydraulic jack.

8. The construction method for basement structural modification as described in claim 7, characterized in that, During the process of actively adjusting the axial force through the servo hydraulic jack, the increased compensating axial force is applied in stages, with each increase not exceeding ±100kN. After the axial force is increased, the corresponding deformation points of the basement exterior wall are measured within 4 to 6 hours. If the deformation converges, the axial force is stopped.

9. The basement structure renovation construction method as described in claim 7, characterized in that, During the demolition of the original structural beams and slabs, strengthen the monitoring of axial force changes in the inclined bracing of the Bn+2F floor, including: When the actual working pressure of the inclined boom changes by more than ±50kN, the hydraulic pump of the computer-controlled servo hydraulic jack will automatically pressurize or depressurize to the set value.

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