A method for constructing an underground structure with a system of disk buckle racks

Abstract

A kind of underground structure construction method with disc buckle frame replacement support system, comprising the following steps: 1) using open excavation method, after excavation in place, set up enclosure structure and horizontal support;2) carry out foundation slab construction, remove the third steel support, pour side wall concrete and partition wall concrete, build multiple lattice columns;3) erect full disc buckle frame, set up multiple groups of steel pipe replacement support;4) twice repeat the pouring in step 2) and step 3);5) remove the second steel support, continue to pour the side wall and partition wall of the layer above;6) continue to pour the side wall of the layer above, remove the first steel support;7) pour the remaining side wall, until reach the position of the concrete support.The present application can make up for the many defects of using steel replacement support in the prior art, and speed up the construction period, reduce the cost, and the construction quality is guaranteed.

Description

TECHNICAL FIELD

[0001] The present application relates to the construction technology field of underground engineering structure, in particular to a kind of underground structure construction method with disc buckle frame support replacement system. BACKGROUND

[0002] With the increasingly accelerated urbanization process, urban underground space is widely developed and utilized. With the increasing depth of foundation pit, excavation area, to reduce the deformation of foundation pit, ensure the safety and stability of foundation pit, the support replacement technology in foundation pit is worth further discussing and researching. The previous support replacement technology not only increases the workload, but also causes the working face to be idle, delays the construction progress; the support replacement is usually removed in the underground 2 layers after the completion of the main structure construction, and the large hoisting equipment cannot be normally hoisted in the narrow space, so the removal and transportation of support replacement rely on manual operation, which is low in construction efficiency and affects the subsequent construction. In addition, a large amount of removal and transportation operation needs to be completed manually, which increases the labor cost greatly.

[0003] In the existing conventional construction, the bottom plate, the negative two layer side wall is constructed, the steel support replacement is installed, and then the middle partition wall and the middle plate are constructed, which has the following disadvantages: (1) the middle plate formwork support system meets the position of steel support replacement, which is not convenient to erect, adopts steel pipe connection, and the overall stability is affected, and there are cross operations and safety hazards; (2) the steel support replacement installation needs to embed steel plate in the side wall and embed anchor bar, which has leakage risk and increases cost; (3) when the steel support replacement is removed, because the negative two layer partition wall is constructed, only a hole is left at the position of the steel support replacement (later blocked), the removal adopts forklift, cannot adopt crane hoisting, and the removal has great safety risk; (4) the hole is supplemented after the partition wall, and the blocking is carried out after the removal of the steel support replacement, which is not good in construction quality without one-time forming effect. SUMMARY

[0004] In order to solve the defects in the prior art, the present application provides a kind of underground structure construction method with disc buckle frame support replacement system, which can make up for the defects of using steel support replacement in the prior art, speed up the construction period, reduce the cost, and ensure the construction quality.

[0005] To achieve the above purpose, the present application provides a kind of underground structure construction method with disc buckle frame support replacement system, comprising the following steps:

[0006] 1) adopt open cut method construction, set up enclosure structure after excavation, the enclosure structure adopts underground continuous wall, and a concrete support and three steel supports are sequentially arranged from top to bottom along the depth direction of foundation pit;

[0007] 2) Perform the foundation bottom plate construction, after the construction is completed, wait to reach the design strength, remove the third steel support, pour the side wall concrete and the partition wall concrete, and construct multiple lattice columns between the foundation bottom plate and the concrete support along the longitudinal direction of the underground structure; the length of the side wall and the partition wall poured along the longitudinal direction of the underground structure is 1 / 3 of the total length of the side wall and the partition wall along the longitudinal direction of the underground structure respectively;

[0008] 3) After the side wall and the partition wall reach the design strength, remove the formwork, and erect the full-frame disc buckle frame, use multiple groups of steel pipe support supports at the original designed steel support support elevation, which are arranged between the constructed side wall and the partition wall and are supported and connected by the full-frame disc buckle frame, and the ends of the multiple groups of steel pipe support supports are respectively tightly pressed against the side wall and the partition wall;

[0009] 4) Repeat the pouring in step 2) and step 3) twice to complete the pouring of the remaining side wall and partition wall of the layer and the erection of the remaining full-frame disc buckle frame and steel pipe support support of the layer;

[0010] 5) Remove the second steel support, continue to pour the side wall concrete and the partition wall concrete of the upper layer, complete the side wall and the partition wall of the layer, and pour the concrete thereon to complete the top plate construction of the layer;

[0011] 6) Continue to pour the side wall concrete of the upper layer, and remove the first steel support after the side wall concrete reaches the design strength;

[0012] 7) Pour the remaining side wall concrete until the position of the concrete support.

[0013] Preferably, in step 1), the concrete support is made of C40 reinforced concrete, is located at the top of the foundation pit, and has a top surface flush with the ground elevation; multiple concrete supports are horizontally and spaced apart along the longitudinal direction of the underground structure, and the adjacent interval distance is 6-7 m, and the cross-sectional dimension of each concrete support is 800*1000 mm.

[0014] Preferably, in any of the above schemes, in step 1), multiple steel supports are horizontally and spaced apart along the longitudinal direction of the underground structure, and the adjacent interval distance is 3-5 m, and the cross-sectional dimension of each steel support is Ф800 mm.

[0015] Preferably, in any of the above schemes, in step 2), the construction height of the side wall is below the third steel support; the integral large formwork support frame is used when pouring the side wall concrete and the partition wall concrete, and is composed of a shaped triangular support frame and a wood formwork.

[0016] Preferably, in any of the above schemes, in step 3), the frame body of the full-frame disc buckle frame adopts a socket-type disc buckle support system, the horizontal transverse spacing of the frame body is 1.5 m, the horizontal transverse spacing is 1.5 m, and the step distance is 1.5 m.

[0017] Preferably in any of the above solutions, in step 3), each group of steel pipe bracing is supported by 4 support steel pipes, 2 on the top and 2 on the bottom, with a horizontal spacing of 1.5-2m and a vertical spacing of 0.75-0.8m; the cross-sectional dimension of each support steel pipe is Ф48mm and the thickness is 3.2mm; the horizontal spacing of each group of steel pipe bracing supported by adjacent support steel pipes is 4.5-6m.

[0018] Preferably in any of the above solutions, in step 3), when the end part of each group of steel pipe bracing is tightly pressed against the side wall and the partition wall, the end part is synchronously extended and contracted, specifically, a small servo motor is arranged on each support steel pipe, a driving gear and a driven gear meshing with the driving gear are arranged on the inner side of the two ends of each support steel pipe, the small servo motor is connected with the driving gear, the driven gear is connected with a rotating screw through a transmission structure, and a push plate is arranged on the free end of the rotating screw.

[0019] Preferably in any of the above solutions, the disc buckle frame bracing system establishes a space finite element model through Midas finite element analysis software, calculates and analyzes the structural displacement and the internal force of the steel pipe bracing support, and performs stability checking of the horizontal bar and the steel pipe bracing support.

[0020] Preferably in any of the above solutions, the erection method of the full-disc disc buckle frame is measuring and drawing lines, placing a bottom support, adjusting the level of the bottom support base, installing the bottom layer vertical rods and horizontal longitudinal, transverse and inclined rods, lengthening the vertical rods upwards, gradually installing the horizontal longitudinal, transverse and inclined rods from bottom to top, installing the vertical inclined rods, and installing the safety protection net.

[0021] Preferably in any of the above solutions, the thickness of the partition wall is 300-500mm and is uniformly and spacedly arranged between the side walls; longitudinal connecting beams are arranged below the second steel support and on the two sides of the lattice column, and the cross-sectional dimension of the lattice column is 460*460mm.

[0022] The beneficial effects of the present application are as follows:

[0023] 1. The present application can make up for the defects in the prior art using steel bracing, and can accelerate the construction period, reduce the cost, and ensure the construction quality; the steel bracing is replaced by the disc buckle frame bracing system, which is fast in construction, has less process interpenetration, reduces the cost, shortens the overall construction period by 40 days, and is beneficial to the project cost and progress control.

[0024] 2. The application adopts batch construction in steps 2) and 3), when 1 / 3 of the disc buckle frame bracing system is built, the removed formwork can be used for the construction of the next 1 / 3 of the side wall and partition wall, the formwork can be reused, continuous construction is formed, construction procedures are saved, efficiency is improved, and construction cost is reduced. The two ends of the steel pipe bracing support are synchronously telescopic, the synchronous and equal force pressing of the side wall and / or partition wall at the two ends is realized, the stability of the overall structure is ensured, and the construction time is shortened.

[0025] 3. The disc buckle frame bracing system of the application is calculated by modeling, and the displacement deformation requirement of the enclosure structure is met by using finite element analysis, and the system stability also meets the requirement. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 A longitudinal section view of an underground structure with a disc buckle frame bracing system according to the construction method of the application.

[0027] 1-steel pipe bracing support, 2-steel support, 3-concrete support, 4-side wall, 5-partition wall, 6-lattice column, 7-longitudinally continuous beam. DETAILED DESCRIPTION

[0028] The technical solutions of the application will be described in detail below in combination with the specific embodiments of the application and the drawings, but the following examples are only used to understand the application, the examples in the application and the features in the examples can be combined with each other, and the application can be implemented in various different ways limited and covered by the claims.

[0029] Example 1

[0030] Referring to Figure 1 A construction method of an underground structure with a disc buckle frame bracing system, comprising the following steps:

[0031] 1) Adopting open excavation method, setting up enclosure structure after excavation, the enclosure structure adopts 800mm thick underground continuous wall, and a concrete support and three steel supports are sequentially arranged from top to bottom along the depth direction of the foundation pit;

[0032] 2) Constructing the foundation slab, after the construction is completed, the third steel support is removed after reaching the design strength, the side wall concrete and the partition wall concrete are poured, and a plurality of lattice columns are constructed along the longitudinal direction of the underground structure between the foundation slab and the concrete support; the length of the side wall and the partition wall poured along the longitudinal direction of the underground structure is 1 / 3 of the total length of the overall side wall and partition wall along the longitudinal direction of the underground structure;

[0033] 3) after the side wall and partition wall reach the design strength, the formwork is removed, a full set of disc buckle frame is erected, a plurality of groups of steel pipe bracing supports are used at the original design steel bracing support elevation, which are arranged between the constructed side wall and partition wall and are supported and connected by the full set of disc buckle frame, the ends of the plurality of groups of steel pipe bracing supports are respectively tightly supported against the side wall and partition wall;

[0034] 4) the pouring in step 2) and step 3) are repeated twice to complete the pouring of the remaining side wall and partition wall of the layer and the erection of the remaining full set of disc buckle frame and steel pipe bracing support of the layer;

[0035] 5) the second steel support is removed, the side wall concrete and partition wall concrete of the layer above are continuously poured, the side wall and partition wall of the layer are completed, and the top plate of the layer is poured and constructed;

[0036] 6) the side wall concrete of the layer above is continuously poured, and the first steel support is removed after the side wall concrete reaches the design strength;

[0037] 7) the remaining side wall concrete is poured until the position of the concrete support.

[0038] In step 1), the concrete support is made of C40 reinforced concrete, is located at the top of the foundation pit, and has a top surface flush with the ground elevation; a plurality of the concrete supports are horizontally and longitudinally arranged at intervals along the underground structure, and the adjacent interval distance is 6 m, and the cross-sectional size of each concrete support is 800*1000 mm.

[0039] In step 1), a plurality of the steel supports are horizontally and longitudinally arranged at intervals along the underground structure, and the adjacent interval distance is 5 m, and the cross-sectional size of each steel support is Ф800 mm.

[0040] In step 2), the construction height of the side wall is below the third steel support; the integral large formwork support frame is used when the side wall concrete and partition wall concrete are poured, and is composed of a shaped triangular support frame and a wood formwork.

[0041] In step 3), the frame body of the full set of disc buckle frame adopts a socket type disc buckle support system, the horizontal transverse spacing of the frame body is 1.5 m, the horizontal transverse spacing is 1.5 m, and the step distance is 1.5 m.

[0042] In step 3), in step 3), each group of steel pipe bracing support has 4 support steel pipes, 2 of which are above and 2 of which are below, the horizontal spacing is 1.5 m, and the vertical spacing is 0.8 m; the cross-sectional size of each support steel pipe is Ф48 mm, and the thickness is 3.2 mm; the horizontal spacing of each group of steel pipe bracing support is 4.5 m.

[0043] In step 3), when the ends of the groups of steel pipe bracing supports are respectively tightly pressed against the side walls and the partition walls, a synchronous telescopic pressing mode is adopted, specifically, a small servo motor is arranged for each bracing steel pipe, a driving gear and a driven gear meshing with the driving gear are arranged on the inner sides of the two ends of each bracing steel pipe, the small servo motor is connected with the driving gear, the driven gear is connected with a rotating screw through a transmission structure, and a push plate is arranged at the free end of the rotating screw.

[0044] The disc buckle frame bracing support system establishes a space finite element model through the Midas finite element analysis software, calculates and analyzes the structural displacement and the internal force of the steel pipe bracing support, and performs stability checking of the horizontal bars and the steel pipe bracing support.

[0045] The erection mode of the full disc buckle frame is measuring and drawing lines, placing a bottom support, adjusting the level of the bottom support base, installing the bottom layer vertical rods and horizontal, vertical and inclined rods, lengthening the vertical rods upward, gradually installing the horizontal, vertical and inclined rods from bottom to top, installing the vertical inclined rods, and installing the safety protection net.

[0046] The thickness of the partition wall is 500 mm, and the partition wall is uniformly arranged between the side walls; longitudinal connecting beams are arranged below the second steel support and on the two sides of the lattice column, and the cross-sectional size of the lattice column is 460*460 mm.

[0047] Example 2

[0048] Reference Figure 1 A construction method of an underground structure with a disc buckle frame bracing support system, comprising the following steps:

[0049] 1) The open excavation method is used for construction, and after excavation, a retaining structure is arranged, the retaining structure uses an 800 mm thick underground continuous wall, and a concrete support and three steel supports are arranged in turn from top to bottom along the depth direction of the foundation pit;

[0050] 2) The foundation slab is constructed, after the construction is completed, the third steel support is removed after the design strength is reached, the side wall concrete and the partition wall concrete are poured, and a plurality of lattice columns are constructed along the longitudinal direction of the underground structure between the foundation slab and the concrete support; the length of the side wall and the partition wall poured along the longitudinal direction of the underground structure is 1 / 3 of the total length of the whole side wall and the partition wall along the longitudinal direction of the underground structure;

[0051] 3) After the side wall and the partition wall reach the design strength, the formwork is removed, and a full disc buckle frame is erected, a plurality of groups of steel pipe bracing supports are arranged at the designed steel bracing support elevation, the steel pipe bracing supports are arranged between the constructed side wall and the partition wall and are connected by the full disc buckle frame support, and the ends of the groups of steel pipe bracing supports are respectively tightly pressed against the side wall and the partition wall;

[0052] 4) repeat the pouring of the side wall and partition wall in step 2) and step 3) twice to complete the remaining side wall and partition wall pouring of the layer and the remaining full-disk buckle frame and steel pipe support erection of the layer;

[0053] 5) remove the second steel support, continue to pour the side wall concrete and partition wall concrete of the layer above, complete the side wall and partition wall of the layer, and pour the concrete thereon to complete the top slab construction of the layer;

[0054] 6) continue to pour the side wall concrete of the layer above, and remove the first steel support after the side wall concrete reaches the design strength;

[0055] 7) pour the remaining side wall concrete until the position of the concrete support is reached.

[0056] In step 1), the concrete support is made of C40 reinforced concrete, located at the top of the foundation pit, and the top surface is flush with the ground level; the one-way concrete support is horizontally and longitudinally spaced apart along the underground structure, and the adjacent interval distance is 7m, and the cross-sectional size of each is 800*1000mm.

[0057] In step 1), each steel support is horizontally and longitudinally spaced apart along the underground structure, and the adjacent interval distance is 3m, and the cross-sectional size of each steel support is Ф800mm.

[0058] In step 2), the construction height of the side wall is below the third steel support; the integral large formwork support frame is used when pouring the side wall concrete and partition wall concrete, which is composed of a shaped triangular support frame and a wood formwork.

[0059] In step 3), the frame body of the full-disk buckle frame adopts a socket-type disk buckle support system, and the horizontal transverse spacing of the frame body is 1.5m, the horizontal transverse spacing is 1.5m, and the step distance is 1.5m.

[0060] In step 3), in step 3), each group of steel pipe support has 4 support steel pipes, 2 above and 2 below, with a horizontal spacing of 2m and a vertical spacing of 0.75m; the cross-sectional size of each support steel pipe is Ф48mm, and the thickness is 3.2mm; the horizontal spacing of adjacent each group of steel pipe support is 6m.

[0061] In step 3), when the end portions of the multiple groups of steel pipe supports are tightly pressed against the side wall and the partition wall, a synchronous telescopic pressing mode is adopted, specifically, a small servo motor is arranged on each support steel pipe, a driving gear and a driven gear meshing with the driving gear are arranged on the inner side of the two end portions of each support steel pipe, the small servo motor is connected with the driving gear, the driven gear is connected with a rotating screw through a transmission structure, and a push plate is arranged on the free end of the rotating screw.

[0062] The disc buckle frame support system establishes a space finite element model by using the Midas finite element analysis software, calculates and analyzes the structure displacement and the internal force of the steel pipe support, and performs stability checking calculation on the horizontal rod and the steel pipe support.

[0063] The erection mode of the full disc buckle frame is: measuring and drawing lines, placing the bottom support, adjusting the level of the bottom support base, installing the bottom vertical rod and horizontal, vertical and inclined rods, lengthening the vertical rod upward, installing the horizontal, vertical and inclined rods step by step from bottom to top, installing the vertical inclined rod, and installing the safety protection net.

[0064] The thickness of the partition wall is 300mm, and the partition wall is uniformly arranged between the side walls; the longitudinal connecting beams are arranged below the second steel support and on the two sides of the lattice column, and the cross-sectional size of the lattice column is 460*460mm.

[0065] In addition, in order to further improve the technical effect of the present application, in step 3), a plurality of steel pipe support groups are connected by the full disc buckle frame support, the plurality of steel pipe support groups are supported by the horizontal rods of the full disc buckle frame, and the fixed connection between the steel pipe support and the horizontal rod is realized by the installation clamp. The installation clamp comprises an upper support base, a lower connecting base is arranged on the lower side of the upper support base, the upper support base and the lower connecting base are rotatable, and fixing holes are arranged on the upper support base and the lower connecting base. The steel pipe of the steel pipe support is fixed on the upper support base by a U-shaped clamp, the horizontal rod is fixed on the lower connecting base by a U-shaped clamp, the free ends of the U-shaped clamps pass through the corresponding fixing holes, and the steel pipe and the horizontal rod are fixed by a nut. After the upper support base and the lower connecting base are rotated to a suitable angle, the fixed connection between the steel pipe and the horizontal rod arranged in a certain angle range is adjusted, so that the use range of the installation clamp is wider, and the upper support base and the lower connecting base are fixed by a locking pin after being rotated in place, so that the positioning and fixing of the two are realized.

[0066] The position and size of the fixing hole are matched with the free end of the U-shaped clamp. The free end of the U-shaped clamp is provided with a threaded portion matched with the internal thread of the nut. The surface of the U-shaped clamp is uniformly coated with an anti-corrosion layer. The inner diameter of the U-shaped clamp of the upper support base is matched with the steel pipe, and the inner diameter of the U-shaped clamp of the lower connecting base is matched with the horizontal rod.

[0067] In the embodiment, appropriate U-shaped clamps and nuts can be selected, and corresponding adjustment can be made by rotating the upper support base and the lower connecting base according to the included angle between the steel pipe and the horizontal rod, so as to realize fixed connection of different sizes and different included angles, the connection is more firm and not easy to fall off, the structure is simple, the installation is easier, the connection of multi-angle cross members can be realized, the use is safe and stable, the installation, disassembly and replacement are convenient, and the application range is wide.

[0068] In the embodiment, the basic components of the disc buckle frame are less, and the installation and disassembly of the frame body are more convenient. The disc buckle frame mainly adopts national standard material steel pipes and low alloy material steel pipes, the strength of which is 3 times higher than that of ordinary carbon steel pipes of ordinary scaffolds, belongs to high-strength steel connecting fasteners, has simple structure, stable stress, safety and reliability, avoids unsafe factors in the operation process, improves the bending strength of the frame body, can completely meet the operation space of the later construction, and relatively reduces the labor cost.

[0069] Embodiment 3

[0070] Referring to Figure 1 A construction method of an underground structure with a disc buckle frame support changing system, comprising the following steps:

[0071] 1) The open excavation method is used for construction, the enclosure structure is set after excavation, the enclosure structure adopts an 800mm thick underground continuous wall, and a concrete support and three steel supports are sequentially arranged from top to bottom along the depth direction of the foundation pit;

[0072] 2) The foundation slab construction is performed, after the construction is completed, the third steel support is removed after the design strength is reached, the side wall concrete and the partition wall concrete are poured, and a plurality of lattice columns are constructed along the longitudinal direction of the underground structure between the foundation slab and the concrete support; the length of the side wall and the partition wall poured along the longitudinal direction of the underground structure is 1 / 3 of the total length of the overall side wall and the partition wall along the longitudinal direction of the underground structure;

[0073] 3) After the side wall and the partition wall reach the design strength, the formwork is removed, and a full disc buckle frame is erected, a plurality of steel pipe support changing supports are arranged at the designed steel support changing elevation, which are arranged between the constructed side wall and the partition wall and are connected and supported by the full disc buckle frame, and the ends of the plurality of steel pipe support changing supports are tightly pressed against the side wall and the partition wall, respectively;

[0074] 4) The pouring in step 2) and step 3) are repeated twice to complete the pouring of the remaining side wall and partition wall of the layer and the erection of the remaining full disc buckle frame and steel pipe support changing support of the layer;

[0075] 5) The second steel support is removed, the side wall concrete and the partition wall concrete of the upper layer are continuously poured, the side wall and the partition wall of the layer are completed, and the concrete is poured thereon to complete the top plate construction of the layer;

[0076] 6) The side wall concrete of the upper layer is continuously poured, and after the side wall concrete reaches the design strength, the first steel support is removed;

[0077] 7) The remaining side wall concrete is poured until the position of the concrete support.

[0078] In step 1), the concrete support is made of C40 reinforced concrete, is located at the top of the foundation pit, and has a top surface flush with the ground level; the one-way concrete support is horizontally and longitudinally spaced at intervals, and the adjacent interval distance is 6.5 m; and the cross-sectional size of each one-way concrete support is 800*1000 mm.

[0079] In step 1), each steel support is horizontally and longitudinally spaced at intervals, and the adjacent interval distance is 4 m; and the cross-sectional size of each steel support is Ф800 mm.

[0080] In step 2), the construction height of the side wall is below the third steel support; and the integral large formwork support frame is used for pouring the side wall concrete and the partition wall concrete, and is composed of a shaped triangular support frame and a wood formwork.

[0081] In step 3), the frame body of the full-frame disc buckle frame adopts a socket-type disc buckle support system, the horizontal transverse spacing of the frame body is 1.5 m, the horizontal transverse spacing is 1.5 m, and the step distance is 1.5 m.

[0082] In step 3), in step 3), each group of steel pipe brace support has 4 support steel pipes, 2 of which are above and 2 of which are below, the horizontal spacing is 1.8 m, and the vertical spacing is 0.78 m; the cross-sectional size of each support steel pipe is Ф48 mm, and the thickness is 3.2 mm; and the horizontal spacing of adjacent each group of steel pipe brace support is 5 m.

[0083] In step 3), when the end portions of the multiple groups of steel pipe brace supports are respectively tightly pressed against the side wall and the partition wall, a synchronous expansion and tight pressing mode is adopted, specifically, a small servo motor is arranged on each support steel pipe, a driving gear and a driven gear meshing with the driving gear are arranged on the inner side of the two end portions of each support steel pipe, the small servo motor is connected with the driving gear, the driven gear is connected with a rotating screw through a transmission structure, and a push plate is arranged on the free end of the rotating screw.

[0084] The disc buckle frame brace support system establishes a space finite element model through the Midas finite element analysis software, calculates and analyzes the structure displacement and the internal force of the steel pipe brace support, and performs stability checking of the horizontal rod and the steel pipe brace support.

[0085] The erection mode of the full-frame disc buckle frame is measuring and drawing lines, placing a bottom support, adjusting the level of the bottom support base, installing the bottom layer of vertical rods and horizontal longitudinal, transverse and inclined rods, lengthening the vertical rods upward, gradually installing the horizontal longitudinal, transverse and inclined rods from bottom to top, installing the vertical inclined rods, and installing the safety protection net.

[0086] The thickness of the partition wall is 400 mm, and the partition wall is uniformly and intervally arranged between the side walls; the longitudinal connecting beams are arranged below the second steel support and on the two sides of the lattice column; and the cross-sectional size of the lattice column is 460*460 mm.

[0087] In addition, in order to further improve the technical effects of the present application, in the embodiment, the small servo motor can control the rotating speed, so as to control the jacking force of the steel pipe support. That is, when the steel pipe support does not contact the side wall and the partition wall, the normal rotating speed of the servo motor can be used to drive the push plates at both ends to extend, when the push plates contact and gradually jacks up the side wall and the partition wall, the rotating speed of the servo motor is controlled to drive the gear at a low speed, so as to control the push plates to jack up the side wall and the partition wall at a low speed, avoiding the strong impact jacking damage to the side wall and the partition wall, and ensuring the safety of the structure. When the jacking force reaches a threshold value, the servo motor is controlled to stop working, further improving the safety effect, which is not only beneficial to improve the construction efficiency, but also beneficial to improve the construction quality.

[0088] The jacking force is monitored by a pressure sensor arranged on the surface of the push plate. The pressure sensor is a flexible sensor, which includes a conductive pole, a conductive layer and a sensing film. The sensing film includes the following components by weight: nano silver particles 120, ethyl acrylate 10-15, polyvinyl CAS 2-5, polyoxyethylene-8-octyl phenyl ether 5-8.

[0089] The pressure sensor is resistant to bending, can accurately perceive slight pressure, and still has high sensitivity under high pressure, has high reliability and good durability; the detection precision repeatability is good, the number of calibration test contacts is improved, the conductivity is further improved, the sensitivity is improved, and the detection effect is good.

[0090] In the embodiment, under the action of the earth pressure load, the earth pressure of the support area is borne by the frame body replacing the support without considering the retaining effect of the enclosure structure. It is suitable for calculation and analysis in the support replacement design stage, and the calculation result is safer. Under the action of the displacement load, the displacement value of the enclosure structure is used as the additional load of the frame body, which can ensure the coordinated deformation of the enclosure structure and the frame body, and indirectly consider the retaining effect of the enclosure structure. In order to strengthen the actual effect of the support replacement, the axial force compensation technical measure is adopted, which can reduce the problem of uneven stress of the enclosure structure and the frame body caused by construction deviation in the construction process.

[0091] As can be seen from the above embodiment, the present application can make up for the defects in the prior art using steel support, and accelerate the construction period, reduce the cost, and ensure the construction quality; the steel support is replaced by the disc buckle frame support system, which is fast in construction, has less process insertion, reduces the cost, shortens the overall construction period by 40 days, and is beneficial to the project cost and progress control.

[0092] The application adopts batch construction in steps 2) and 3), when 1 / 3 part of the disc buckle frame support system is built, the next 1 / 3 part of the side wall and partition wall construction can be carried out by using the removed formwork, the formwork can be reused, continuous construction is formed, construction procedure is saved, efficiency is improved, and construction cost is reduced. The two ends of the steel pipe support system are synchronously telescopic, the synchronous and equal force pressing of the side wall and / or partition wall at the two ends is realized, the stability of the whole structure is ensured, and the construction time is shortened.

[0093] The application sets the disc buckle frame support system by modeling calculation, uses finite element analysis, meets the displacement deformation requirements of the enclosure structure, and also meets the requirements of the system stability.

[0094] The above is only the preferred embodiment of the application, and is not intended to limit the application in other forms. Any skilled person in the art can modify or change the above disclosed technical content into equivalent embodiments. However, any simple modification, equivalent change and modification of the above embodiments without departing from the technical scheme of the application, according to the technical essence of the application, still belongs to the protection scope of the technical scheme of the application.

Claims

1. A method of constructing an underground structure with a system of disc-clip shelves and braces, characterized in that, The method comprises the following steps: 1) using open excavation method, setting up the enclosure structure after excavation, the enclosure structure uses underground continuous wall, and a concrete support and three steel supports are sequentially arranged from top to bottom along the depth direction of the foundation pit; 2) performing foundation bottom plate construction, after the construction is completed and the design strength is reached, the third steel support is removed, the side wall concrete and the partition wall concrete are poured, and a plurality of lattice columns are constructed along the longitudinal direction of the underground structure between the foundation bottom plate and the concrete support; the length of the side wall and the partition wall poured along the longitudinal direction of the underground structure is 1 / 3 of the total length of the side wall and the partition wall along the longitudinal direction of the underground structure; 3) after the side wall and the partition wall reach the design strength, the formwork is removed, and a full set of disc buckle frame is erected, a plurality of groups of steel pipe support supports are arranged at the designed steel support elevation, the steel pipe support supports are arranged between the constructed side wall and the partition wall and are supported and connected by the full set of disc buckle frame, and the ends of the plurality of groups of steel pipe support supports are respectively tightly pressed against the side wall and the partition wall; 4) the pouring in step 2) and step 3) are repeated twice, the remaining side wall and partition wall pouring of the layer and the remaining full set of disc buckle frame and steel pipe support support erection of the layer are completed; 5) the second steel support is removed, the side wall concrete and the partition wall concrete of the upper layer are continuously poured, the side wall and the partition wall of the layer are completed, and the concrete is poured thereon to complete the top plate construction of the layer; 6) the side wall concrete of the upper layer is continuously poured, and after the side wall concrete reaches the design strength, the first steel support is removed; 7) the remaining side wall concrete is poured until the position of the concrete support.

2. The method of constructing an underground structure with a system of post-tensioned arches according to claim 1, wherein, In step 1), the concrete support is made of C40 reinforced concrete, is located at the top of the foundation pit, and has a top surface flush with the ground level; the concrete support is horizontally spaced in the longitudinal direction of the underground structure, and the adjacent spacing distance is 6-7 m; and the cross-sectional size of each concrete support is 800*1000 mm.

3. The method of constructing an underground structure with a system of post-tensioned car park decks according to claim 2, wherein, In step 1), each steel support is horizontally spaced in the longitudinal direction of the underground structure, and the adjacent spacing distance is 3-5 m; and the cross-sectional size of each steel support is Ф800 mm.

4. The method of constructing an underground structure with a system of post-tensioned car park decks according to claim 3, wherein, In step 3), the frame body of the full set of disc buckle frame adopts a socket-type disc buckle support system, the horizontal transverse spacing of the frame body is 1.5 m, the horizontal transverse spacing is 1.5 m, and the step distance is 1.5 m.

5. The method of constructing an underground structure with a system of post-tensioned arches according to claim 4, wherein, In step 3), each group of steel pipe support supports has 4 support steel pipes, 2 of which are on the upper side and 2 of which are on the lower side, the horizontal spacing is 1.5-2 m, and the vertical spacing is 0.75-0.8 m; the cross-sectional size of each support steel pipe is Ф48 mm, and the thickness is 3.2 mm; and the horizontal spacing of each group of steel pipe support supports is 4.5-6 m.

6. The method of constructing an underground structure with a post-tensioned car park support system according to claim 4, wherein, In step 3), when the ends of the plurality of groups of steel pipe support supports are respectively tightly pressed against the side wall and the partition wall, a synchronous stretching and contracting tight pressing mode is adopted at the ends, specifically, a small servo motor is arranged on each support steel pipe, a driving gear and a driven gear meshing with the driving gear are arranged on the inner side of the two ends of each support steel pipe, the small servo motor is connected with the driving gear, the driven gear is connected with a rotating screw through a transmission structure, and a push plate is arranged on the free end of the rotating screw.

7. The method of constructing an underground structure with a system of disc-clip shelves according to claim 6, characterized in that, The space finite element model is established by using Midas finite element analysis software, the structural displacement and the internal force of the steel pipe bracing support are calculated and analyzed, and the stability checking calculation of the horizontal bar and the stability checking calculation of the steel pipe bracing support are carried out.

8. The method of constructing an underground structure with a post-tensioned car park support system according to claim 7, wherein, The erection mode of the full-hall disc buckle frame is as follows: measuring and drawing lines, placing a bottom support, adjusting the level of the bottom support base, installing the bottom layer vertical rod and horizontal, longitudinal, and inclined rods, lengthening the vertical rod upward, gradually installing the horizontal, longitudinal, and inclined rods from bottom to top, installing the vertical inclined rod, and installing the safety protection net.

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