A precast reinforced concrete component for lining the edge of a foundation pit

Abstract

The present invention relates to the technical field of foundation pit edge repair and discloses a reinforced concrete prefabricated part for foundation pit edge repair, including a prefabricated part, which is arranged on the inner wall of the foundation pit, and the prefabricated part includes prefabricated long plates stacked and spliced ​​into a whole, and prefabricated short plates are engaged at the upper and lower ends of the prefabricated long plates, and a pad 1 is provided on the side of the prefabricated short plate located at the bottom, and a pad 2 is provided on the outer side of the prefabricated short plate located at the top, and pad 1 and pad 2 both adopt an L-shaped design. The invention is provided with pad 1 and pad 2, and the overlying part of the bottom pad 1 can disperse the vertical pressure transmitted by the prefabricated short plate from the traditional "bottom edge of the prefabricated short plate" to a larger range of pit bottom soil, thereby increasing the contact area, reducing the local pressure of the foundation, and avoiding settlement of the soft soil base due to concentrated stress; the overlying part of the top pad 2 can transmit the lateral soil pressure to the soil above the pit mouth, reducing the stress concentration at the top of the prefabricated short plate.

Description

Technical Field

[0001] This invention relates to the field of foundation pit edge repair technology, specifically to a precast reinforced concrete component for foundation pit edge repair. Background Technology

[0002] A foundation pit is a hole excavated in a building project to construct an underground structure (such as a foundation, basement, or pile foundation). To prevent subsequent walls from cracking or tilting due to uneven soil settlement, reduce the risk of collapse and landslide, ensure the quality and safety of the foundation pit project, and provide an installation base for support piles and dustproof awnings, precast reinforced concrete components are used to reinforce the edges of the foundation pit.

[0003] Current technologies for reinforcing the edges of foundation pits typically employ a combination of precast cylindrical components and multiple precast components joined together. However, when precast cylindrical components and spliced ​​precast blocks are joined together using interlocking and tongue-and-groove joints, two types of problems can easily arise under lateral earth pressure: first, the overall soil shear failure pushes the precast components into the pit; second, the tongue-and-groove joints, due to their shallow groove depth, experience shear slippage under lateral force. This can lead to cracking of the precast component joints, overall misalignment, and ultimately, instability and collapse of the pit wall soil. This not only interferes with subsequent processes such as reinforcement cage installation and mortar pouring but may also cause damage to construction materials and safety risks to personnel, and may even necessitate demolition and rework, significantly increasing the construction period and costs. Summary of the Invention

[0004] Technical problems to be solved

[0005] To address the aforementioned shortcomings of existing technologies, this invention provides a precast reinforced concrete component for edge lining of foundation pits. This effectively solves the problem that existing precast components are prone to slippage due to insufficient shear resistance under lateral earth pressure, as well as joint shear slippage.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] This invention provides a precast reinforced concrete component for edge lining of a foundation pit, comprising:

[0008] Basic pit;

[0009] The precast component is set on the inner wall of the foundation pit. The precast component includes a precast long plate stacked and spliced ​​into a whole. Precast short plates are engaged at both the upper and lower ends of the precast long plate. A pad plate one is provided on the side of the lower precast short plate, and a pad plate two is provided on the outer side of the upper precast short plate. Both pad plate one and pad plate two adopt an L-shaped design. A precast cylinder is penetrating through the middle of pad plate one. One end of the precast cylinder is embedded in the bottom of the pit, and the other end of the precast cylinder is engaged with the bottom end of the lower precast short plate. A fastening bolt is threaded to the middle of the outer wall of the precast short plate.

[0010] The other end of the fastening bolt is connected to a wedge assembly for engaging and reinforcing the precast long plate.

[0011] Furthermore, a slot is provided at the top of the second pad, and a second fixing plate is fixedly connected to the side of the second pad, the length of the second fixing plate being less than the height of the second pad.

[0012] Furthermore, a reinforcing ring is provided inside the through hole at the bottom of the pad, a positioning plate is fixedly connected to the middle of the pad, and a clamping plate smaller than its own height is fixedly connected to one side of the pad.

[0013] Furthermore, a fixing plate is fixedly connected to the side of the prefabricated short plate near the pit wall, and a positioning groove is opened inside the prefabricated short plate, with the wedge group located on the side of the positioning groove.

[0014] Furthermore, a locking block is fixedly connected to the top of the precast long plate, and a fixing groove is opened at the bottom of the precast long plate to engage with the precast cylinder. A reinforcing ring is provided on the inner wall of the fixing groove. Limiting grooves are symmetrically opened at both ends of the precast long plate, and the locking block is engaged with the positioning groove.

[0015] Furthermore, in the initial state, the wedge assembly includes a second wedge block, the bottom end of which is fitted with the top end of a first wedge block, with the smallest dimension between them, and a stop block is provided on the other side where the second wedge block and the first wedge block are fitted. The symmetrical stop blocks are connected by a connecting plate fixed in the middle.

[0016] Furthermore, the heights of both pad 2 and pad 1 are greater than the height of the prefabricated short plate.

[0017] The technical solution provided by this invention has the following advantages compared with the prior art:

[0018] The present invention is provided with a base plate one and a base plate two. The over-covering part of the bottom base plate one can disperse the vertical pressure transmitted by the precast short slab, such as its own weight and the upper stacked load, from the traditional "bottom edge of the precast short slab" to a larger area of ​​the pit bottom soil, increasing the contact area and reducing the local pressure of the foundation, thus avoiding the settlement caused by concentrated stress in soft soil. The over-covering part of the top base plate two can transmit the lateral earth pressure to the soil above the pit opening, reducing the stress concentration at the top of the precast short slab.

[0019] The dynamic fastening of the wedge assembly of this invention can be completed by a torque wrench, avoiding component displacement or hand injury that may be caused by manual hammering. The anchoring design of fixing plate one and fixing plate two makes the connection process between the pit wall and the precast component visible, which makes it easy for construction personnel to check the anchoring effect in real time, reducing the later risks caused by hidden quality problems, and enhancing the safety and operability of the construction process.

[0020] Temperature variations in the soil surrounding the foundation pit can easily cause deformation of precast components due to thermal expansion and contraction. However, the flexible pre-tightening mechanism of the wedge group in this design can release temperature stress through slight slippage. When the precast long slab expands due to heat, the gap between the wedge blocks can absorb some of the deformation, preventing joint cracking caused by stress accumulation in traditional rigid connections. Simultaneously, the pre-expansion joint between the overlay section of the L-shaped pad and the precast component, combined with the elastic buffer of the rubber sealing strip, further reduces the impact of temperature changes on the overall structure, ensuring the design remains stable even in areas with large diurnal temperature variations.

[0021] The combined structure of precast long and short slabs in this invention facilitates the individual replacement of damaged components without the need for complete dismantling. The detachable nature of the wedge assembly allows for adjustment of the preload to accommodate new load conditions. Additional bolt holes are pre-drilled in the overlay sections of pad one and pad two, enabling the direct addition of anchor points to secure extended precast components. This flexibility shortens the renovation period compared to traditional cast-in-place structures, enabling rapid renovation through a process of "partial dismantling – adding components – re-fastening."

[0022] Traditional prefabricated structures are prone to settlement due to excessive local pressure. This invention is equipped with a pad plate. By expanding the contact area through the horizontal section of the pad plate, the load of the equipment is distributed to a wider range of foundation soil. Combined with the vertical load-bearing capacity of the prefabricated cylinder, it can be directly used as the foundation of a temporary work platform without the need for additional steel plates or roadbed boxes. This reduces the input of construction materials and avoids delays in the construction period caused by the erection of temporary facilities. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0024] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present invention;

[0025] Figure 2 This is a schematic diagram of the prefabricated component structure according to an embodiment of the present invention;

[0026] Figure 3 This is a schematic diagram of a pad structure according to an embodiment of the present invention;

[0027] Figure 4 This is a schematic diagram of the second pad structure according to an embodiment of the present invention;

[0028] Figure 5 This is a schematic diagram of the top surface of the prefabricated long plate according to an embodiment of the present invention;

[0029] Figure 6 This is a schematic diagram of the structure of the bottom surface of the prefabricated long plate according to an embodiment of the present invention;

[0030] Figure 7 This is a schematic diagram of the prefabricated short slab structure according to an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of the block structure according to an embodiment of the present invention.

[0032] The labels in the diagram represent: 1. Foundation pit; 2. Precast component; 21. Precast cylinder; 22. Pad plate one; 221. Reinforcing ring one; 222. Positioning plate; 223. Clamping plate; 23. Precast short plate; 231. Positioning groove; 232. Fixing plate one; 233. Wedge assembly; 2331. Wedge block one; 2332. Wedge block two; 2333. Abutment block; 2334. Connecting plate; 24. Fastening bolt; 25. Precast long plate; 251. Reinforcing ring two; 252. Limiting groove; 253. Clamping block; 254. Fixing groove; 26. Pad plate two; 262. Clamping groove; 263. Fixing plate two. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0034] The present invention will be further described below with reference to embodiments.

[0035] Example:

[0036] See also Figures 1-8 This invention provides a technical solution for precast reinforced concrete components used for edge lining of foundation pits:

[0037] In existing technologies, when prefabricated components are assembled into a whole through interlocking and tongue-and-groove splicing, there are two major problems due to lateral earth pressure: First, the overall shear failure of the soil can easily push the prefabricated component 2 into the pit. Second, because the tongue-and-groove joint is relatively shallow, it is prone to shear slippage under lateral stress, which can lead to cracking of the joint of the prefabricated component 2 and overall misalignment, resulting in the instability and collapse of the pit wall soil. This interferes with subsequent processes such as steel cage installation and mortar grouting, poses personnel safety risks, and requires dismantling and rework, significantly increasing the construction period and cost.

[0038] refer to Figure 1 and Figure 2 The precast component 2 is set on the inner wall of the foundation pit 1. The precast component 2 includes a precast long plate 25 stacked and spliced ​​into a whole. The upper and lower ends of the precast long plate 25 are engaged with precast short plates 23. The side of the lower precast short plate 23 is provided with a pad 1 22, and the outer side of the upper precast short plate 23 is provided with a pad 26. Both pad 1 22 and pad 26 adopt an L-shaped design. The middle of the pad 1 22 is penetrated by a precast cylinder 21, which serves as a vertical bearing core to resist the arching force of the soil. One end of the precast cylinder 21 is embedded in the bottom of the pit, and the other end of the precast cylinder 21 is engaged with the bottom end of the lower precast short plate 23 to form a vertical anti-slip constraint. The middle of the outer wall of the precast short plate 23 is threaded with a fastening bolt 24. The vertical section of the L-shaped structure can not only cover the contact surface between the precast short plate 23 and the pit wall, but also extend upward and downward to form a "redundant contact area".

[0039] refer to Figure 2 , Figure 8 and Figure 7The other end of the fastening bolt 24 is connected to a wedge assembly 233 for engaging and reinforcing the precast long plate 25. A fixing plate 232 is fixedly connected to the side of the precast short plate 23 near the pit wall. A positioning groove 231 is provided inside the precast short plate 23. The wedge assembly 233 is located on the side of the positioning groove 231. In the initial state, the wedge assembly 233 includes a second wedge block 2332. The bottom end of the second wedge block 2332 is in contact with the top end of the first wedge block 2331. The size between the two is the smallest. A stop block 2333 is provided on the other side where the second wedge block 2332 and the first wedge block 2331 are in contact. The symmetrical stop blocks 2333 are connected by a connecting plate 2334 fixed in the middle. The connecting plate 2334 ensures that the two stop blocks 2333 move synchronously.

[0040] refer to Figure 2 and Figure 4 The top of pad 26 has a slot 262, and a fixing plate 263 is fixedly connected to the side of pad 26. The length of fixing plate 263 is less than the height of pad 26. The heights of pad 26 and pad 1 22 are both greater than the height of the precast short slab 23 to avoid conflict with the upper structure. Pad 1 22 serves as the bottom bearing plate, and pad 26 serves as the top capping plate. Its special design ensures that its height is greater than that of the precast short slab 23, forming over-coverage protection.

[0041] The over-covering portion of the bottom pad 22 can disperse the vertical pressure transmitted by the precast short slab 23, such as its own weight and the upper stacked load, from the traditional "bottom edge of the precast short slab 23" to a larger area of ​​the pit bottom soil. The increased contact area reduces the local pressure of the foundation and avoids the soft soil from being concentrated under stress and settling. The over-covering portion of the top pad 26 can transmit the lateral earth pressure to the soil above the pit opening through the anchoring of the fixing plate 263 to the pit wall, reducing the stress concentration at the top of the precast short slab 23 and lowering the stress peak value.

[0042] The over-covered section can completely cover the gap between the precast short slab 23 and the pit wall. In traditional structures, due to the high matching, the gap is easily exposed. A continuous closed area is formed from the bottom to the top: the over-covered section of the bottom pad 1 22 can prevent loose soil and water from seeping into the pit from the bottom gap of the precast short slab 23. Especially in sandy soil layers, it can prevent the foundation from being hollowed out due to the loss of fine particles; the over-covered section of the top pad 2 26 can block rainwater and construction debris from entering the top joint between the precast short slab 23 and the precast long slab 25, avoiding the accumulation of dust and water in the joint, which can lead to bolt corrosion or concrete weathering. It forms a "three-dimensional protective barrier" and blocks the passage of hidden dangers.

[0043] The over-cover section rigidly connects the precast short slab 23, the pit wall, and the L-shaped slab through an L-shaped right-angle structure. The over-cover section of the bottom pad 1 22 forms a "double-support constraint" with the outer wall of the precast short slab 23, with a bottom support point and a middle support point, reducing the bending deformation of the precast short slab 23 under lateral forces. The over-cover section of the top pad 2 26 forms an "upward-pulling constraint" through the cooperation of the slot 262 with the top flange of the precast short slab 23, which offsets some of the upward pull force, such as the negative skin friction during pit excavation, thereby increasing the overall overturning resistance coefficient, strengthening the overall structure, and improving the deformation resistance.

[0044] The over-cover section serves as a visual "installation baseline." A horizontal line can be popped out at the top of the over-cover section of the bottom pad 22 to quickly calibrate the installation height of the precast short slab 23. The bottom of the over-cover section of the top pad 26 serves as the top elevation control line for the stacked precast long slabs 25, avoiding the cumbersome process of relying on a level instrument. This simplifies installation positioning and improves construction accuracy, from construction efficiency to long-term stability. It also reduces later maintenance costs and extends the structural lifespan. Over-cover protection reduces the exposed area of ​​joints and shortens the exposed length of joints, thus shortening the intrusion path of rainwater and corrosive media such as acidic and alkaline water in chemical sites, and reducing the rate of bolt corrosion. At the same time, the over-cover section blocks the direct impact of loose soil from the pit wall on the precast component 2, such as soil falling due to construction machinery vibration, reducing surface wear of the precast component 2. In the event of geological changes such as localized quicksand or construction errors, the redundant contact area of ​​the over-covered portion can temporarily bear part of the load. When the precast short slab 23 tilts slightly beyond the specification limit, the over-covered section of the pad 22 can still limit its further tilting through additional contact with the pit wall, thus buying time for adjustment and repair, avoiding the risk of sudden collapse, enhancing emergency tolerance, and improving construction safety.

[0045] The over-cover section works in conjunction with components such as the wedge assembly 233 and the precast cylinder 21. The over-cover section of the bottom pad 1 22 provides a "reaction force fulcrum" for the wedge assembly 233, thereby improving the efficiency of the wedge pre-tightening force transmission. The over-cover section of the top pad 2 26 forms a "cross constraint" with the locking block 253 of the precast long plate 25, reducing the lateral swaying of the stacked long plates and providing a stable working surface for the subsequent installation of the steel cage.

[0046] In the sloping foundation pit 1, the over-covered section can be cut to maintain the height of the over-covered section to adapt to the sloping pit wall, avoiding the high cost of custom-made irregular prefabricated parts 2 required by traditional structures; in the high water level foundation pit, the overlap length between the over-covered section and the waterproof membrane can improve the waterproof level, meet the stringent requirements of underground equipment foundations, adapt to complex working conditions, and expand application scenarios.

[0047] Although over-coverage design increases material usage, the overall cost is reduced by minimizing rework, extending lifespan, and improving efficiency, resulting in significant savings in hidden costs.

[0048] The "high over-coverage" design of pad 1 (22) and pad 2 (26) essentially achieves "functional value-added" through "spatial redundancy." This not only solves the problems of insufficient joint protection, concentrated stress, and cumbersome positioning in traditional structures, but also improves the overall structural stability, adaptability, and economy through collaboration with other components. In the edge construction of foundation pit 1, this design transforms "passive protection" into "active control," providing reliable assurance for construction safety under complex geological conditions and harsh working conditions.

[0049] refer to Figure 2 and Figure 3 A reinforcing ring 221 is installed inside the through hole at the bottom of the pad 22. A positioning plate 222 is fixedly connected to the middle of the pad 22. A clamping plate 223 with a height smaller than the pad itself is fixedly connected to the side of the pad 22.

[0050] refer to Figure 2 , Figure 5 , Figure 6 The top of the precast long plate 25 is fixedly connected with a locking block 253. The bottom of the precast long plate 25 is provided with a fixing groove 254 that engages with the precast cylinder 21. The inner wall of the fixing groove 254 is provided with a reinforcing ring 251 to enhance the shear resistance at the engagement point. Both ends of the precast long plate 25 are symmetrically provided with limit grooves 252. The locking block 253 engages with the positioning groove 231.

[0051] First, one end of the precast cylinder 21 is vertically embedded into the soil at the bottom of the pit, serving as the vertical load-bearing and anti-sliding foundation for the entire structure; the other end is fitted with the through hole in the middle of the pad 22 through the outer wall, so that the horizontal section of the pad 22 fits against the bottom of the pit and the vertical section fits against the pit wall, forming the initial positioning.

[0052] The bottom end of the precast short plate 23 located below is engaged with the top end of the precast cylinder 21, while its side edge is attached to the vertical section of the pad 22. The L-shaped structure of the pad 22 increases the contact area, thus dispersing the lateral force transmitted by the precast short plate 23.

[0053] The side of the precast short slab 23 closest to the pit wall is initially anchored to the pit wall by the fixing plate 232 to reduce lateral swaying; the internal positioning groove 231 is precisely engaged with the locking block 253 at the bottom of the precast long slab 25 to achieve vertical positioning of the precast long slab 25.

[0054] Precast long slabs 25 are stacked along the height of the pit wall. Adjacent precast long slabs 25 are engaged with the fixing grooves 254 of the lower precast long slabs 25 by the top locking block 253. The limiting grooves 252 at both ends ensure that the stacking is linear and straight, forming a continuous vertical retaining surface.

[0055] The precast short plate 23 located above is engaged with the top of the top precast long plate 25, and the vertical section of the pad plate 26 is attached to the outside. The horizontal section of the pad plate 26 is engaged with the flange at the top of the precast short plate 23 through the slot 262. The fixing plate 263 is anchored to the pit wall to form a top constraint.

[0056] Tighten the fastening bolts 24 on the outer wall of the precast short plate 23. The bolt ends push the wedge assembly 233. In the initial state, the contact surface size of the wedge block 1 2331 and the wedge block 2332 is the smallest. As the fastening bolts 24 are pushed forward, the wedge block 1 2331 and the wedge block 2332 slide relative to each other along the inclined surface, pushing the abutment blocks 2333 on both sides to press against the limiting groove 252 of the precast long plate 25. The self-locking effect of the wedges applies a continuous pre-tightening force, so that the precast long plate 25 and the precast short plate 23 form a rigid whole.

[0057] By engaging the prefabricated long plate 25 with the prefabricated short plate 23 using the "locking block 253-positioning groove 231" and the wedge assembly 233 for compression and fastening, the traditional shallow tongue and groove joint is replaced. The shear resistance surface of the joint is expanded from the tongue and groove to the entire engagement surface. At the same time, the pre-tightening force of the wedge assembly 233 generates static friction at the joint, significantly improving the shear slip resistance.

[0058] L-shaped pad 1 22 and pad 26 respectively constrain the fit between the precast short slab 23 and the pit wall from the upper and lower layers, reducing stress concentration caused by local gaps; reinforcing ring 1 221 and reinforcing ring 251 enhance the strength of the connection between the precast cylinder 21 and the precast long slab 25, preventing local concrete crushing; the cooperation between the limiting groove 252 and the abutment block 2333 ensures that the stacked precast long slabs 25 are linear and straight, preventing overall misalignment.

[0059] The precast long slab 25 can be flexibly stacked according to the pit depth through the multi-layer locking of the locking block 253 and the fixing groove 254, which is suitable for foundation pits of different depths, from shallow pits to medium-deep pits; the height of L-shaped pad 1 22 and pad 26 is greater than that of the precast short slab 23, which can cover the gap between the precast short slab 23 and the pit wall, and adapt to the working conditions of local unevenness of the pit wall.

[0060] The dynamic tightening of the wedge group 233 can be quantitatively controlled by a torque wrench to avoid errors caused by manual operation; the anchoring of fixing plate 1 232 and fixing plate 263 to the pit wall reduces the risk of structural collapse during construction.

[0061] This structural design, through multi-dimensional collaborative optimization, specifically addresses core issues in existing technologies such as insufficient anti-slip capability of prefabricated component 2, easy cracking of joints, and poor overall stability. It also generates a systematic solution to various engineering pain points.

[0062] Regarding the improvement of core issues, the deep-embedded anchorage of the precast cylinder 21 and the over-coverage protection of the L-shaped plate form a "dual anti-slip system". The depth of the precast cylinder 21 embedded in the soil at the bottom of the pit significantly increases the vertical pull-out resistance. Combined with the increased contact area of ​​the horizontal section of the pad plate 22 to disperse the foundation pressure, it can effectively resist the slippage driven by the overall shear of the soil, and control the overall slippage of the structure from the traditional 10-50mm to within 5mm. The combination of the wedge group 233 and the "clamping block 253-positioning groove 231" replaces the shallow tongue and groove joint, expanding the shear resistance surface from the groove to the entire clamping surface. The static friction force generated by the pre-tightening force of the wedge is superimposed, which improves the shear strength of the joint and completely solves the shear slippage problem under lateral force. The crack width of the joint can be controlled below 0.2mm. In addition, the over-covering sections of L-shaped pad 122 and pad 26 cover the joint gaps and form a closed protection, blocking the soil loss and water seepage path, avoiding the risk of collapse caused by the hollowing out of the pit wall, and improving the stability coefficient of the pit wall.

[0063] In terms of addressing extended problems, the design improves construction efficiency and avoids human error through modular splicing and quantitative fastening; the pre-tightening mechanism of the wedge group 233 can release temperature stress through slight slippage, and in conjunction with the expansion joint design, it can maintain structural stability in areas with a day-night temperature difference of more than 15°C, solving the cracking problem caused by thermal expansion and contraction of traditional rigid connections; the detachable prefabricated components and reserved modification interfaces shorten the construction period for subsequent modifications such as deepening and widening the foundation pit 1, eliminating the need for overall demolition and significantly reducing maintenance costs.

[0064] Furthermore, the structure's adaptability to construction loads is significantly enhanced. The synergistic bearing capacity of the horizontal section of the base plate 22 and the precast cylinder 21 can directly withstand the compaction of construction machinery without the need for additional temporary roadbed paving. This reduces material input and avoids pit edge settlement caused by mechanical compaction. This multi-fold advantage of "safety + efficiency + environmental protection" makes this design suitable not only for conventional building foundation pits but also for meeting the stringent requirements of complex working conditions such as municipal pipe trenches and chemical equipment foundations, demonstrating broad engineering application value.

[0065] These additional advantages further confirm the comprehensive value of the design in terms of functionality, economy, and environmental protection, enabling it not only to solve the pain points of traditional technologies but also to meet the multiple demands of modern construction projects for efficiency, safety, and sustainability.

[0066] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A precast reinforced concrete component for edge lining of a foundation pit, characterized in that, include: Basic pit (1); Precast component (2), the precast component (2) is set on the inner wall of the foundation pit (1), the precast component (2) includes a precast long plate (25) stacked and spliced ​​into a whole, the upper and lower ends of the precast long plate (25) are fitted with precast short plates (23), the side of the precast short plate (23) located below is provided with a pad plate one (22), the outside of the precast short plate (23) located above is provided with a pad plate two (26), the pad plate one (22) and the pad plate two (26) are both designed in an L shape, the middle of the pad plate one (22) is penetrated by a precast cylinder (21), one end of the precast cylinder (21) is embedded in the bottom of the pit, the other end of the precast cylinder (21) is fitted with the bottom end of the precast short plate (23) located below, and the middle of the outer wall of the precast short plate (23) is threaded with a fastening bolt (24). The other end of the fastening bolt (24) is connected to a wedge group (233) for engaging and reinforcing the precast long plate (25).

2. A precast reinforced concrete component for edge lining of a foundation pit according to claim 1, characterized in that: The top of the pad 2 (26) is provided with a slot (262), and the side of the pad 2 (26) is fixedly connected to a fixing plate 2 (263). The length of the fixing plate 2 (263) is smaller than the height of the pad 2 (26).

3. A precast reinforced concrete component for edge lining of a foundation pit according to claim 1, characterized in that: A reinforcing ring (221) is provided inside the through hole at the bottom of the pad (22). A positioning plate (222) is fixedly connected to the middle of the pad (22). A clamping plate (223) smaller than its own height is fixedly connected to the side of the pad (22).

4. A precast reinforced concrete component for edge lining of a foundation pit according to claim 1, characterized in that: The prefabricated short plate (23) is fixedly connected to a fixing plate (232) on the side near the pit wall. The prefabricated short plate (23) has a positioning groove (231) inside. The inclined wedge group (233) is located on the side of the positioning groove (231).

5. A precast reinforced concrete component for edge lining of a foundation pit according to claim 4, characterized in that: The top of the precast long plate (25) is fixedly connected with a locking block (253), and the bottom of the precast long plate (25) is provided with a fixing groove (254) that engages with the precast cylinder (21). The inner wall of the fixing groove (254) is provided with a reinforcing ring (251). The two ends of the precast long plate (25) are symmetrically provided with limit grooves (252). The locking block (253) engages with the positioning groove (231).

6. A precast reinforced concrete component for edge lining of a foundation pit according to claim 5, characterized in that: In the initial state, the wedge assembly (233) includes a second wedge block (2332), the bottom end of which is in contact with the top end of a first wedge block (2331), with the size between them being the smallest. A stop block (2333) is provided on the other side where the second wedge block (2332) and the first wedge block (2331) are in contact. The symmetrical stop blocks (2333) are connected by a connecting plate (2334) fixed in the middle.

7. A precast reinforced concrete component for edge lining of a foundation pit according to claim 2, characterized in that: The heights of pad 2 (26) and pad 1 (22) are both greater than the height of the precast short slab (23).

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