Supporting structure for high-water-level deep foundation pit
By using a support structure in which the support pile body is embedded in the rock stratum in a high-water-level deep foundation pit, combined with a filler layer and support barrier components, a three-dimensional support network is formed, which solves the problems of slope slippage and leakage in the high-water-level deep foundation pit, enhances the anti-seepage ability and seismic performance, and reduces construction costs.
Patent Information
- Application Number
- CN202511046890.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-07-29
- Publication Date
- 2025-09-23
AI Technical Summary
Deep foundation pits with high water levels are prone to cause problems such as slope slippage, instability of support structures and leakage. Traditional support structures have insufficient anti-seepage capabilities under high water level conditions, and their vibration transmission and pile anti-overturning capabilities are relatively weak.
The support pile body is embedded in the rock layer, combined with the filler layer and support blocking components to form a three-dimensional support network, including support baffles, external support structures and rock anchors. The filler layer is used to absorb water and soil, disperse vibration energy, and enhance anti-deformation ability.
Effectively resist soil pressure, reduce the risk of pile overturning, prevent leakage, improve seismic performance, reduce construction costs, and adapt to complex geological conditions.
Smart Images
Figure CN120683864A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of civil engineering, in particular to a supporting structure for a high water level deep foundation pit. Background Art
[0002] Deep foundation pits with high water levels are deep excavations involving deep excavations and high groundwater levels. They are commonly found in urban underground space development, subway construction, and high-rise building foundation construction. Due to the high soil pressure and strong groundwater permeability surrounding deep foundation pits, they can easily lead to slope slippage, support structure instability, and leakage, posing a serious threat to construction safety and the surrounding environment.
[0003] Conventional deep foundation pit support structures primarily include pile rows, underground diaphragm walls, soil nailing walls, and internal support systems. Pile rows utilize bored or precast piles to create a retaining structure, but soil erosion between piles is prone to occur. Underground diaphragm walls offer excellent integrity but are relatively costly. Soil nailing walls are suitable for relatively stable soil layers, but their resistance to seepage is limited under high water levels. Furthermore, traditional support structures have limited comprehensive capabilities for vibration transmission, pile overturning resistance, and groundwater control. Summary of the Invention
[0004] The purpose of the present invention is to provide a supporting structure for a high water level deep foundation pit to solve the technical problems raised in the background technology.
[0005] To achieve the above object, the present invention provides the following technical solutions:
[0006] A support structure for a deep foundation pit with a high water level, comprising a support mechanism arranged at the slope of the foundation pit, wherein a filler is filled between the support mechanism and the slope of the foundation pit to form a filler layer; the support mechanism comprises a plurality of support pile bodies and a plurality of support blocking assemblies, wherein the plurality of support pile bodies are arranged side by side at the slope of the foundation pit and the bottoms of the support pile bodies are inserted into the bottom rock layer of the foundation pit, and the support blocking assemblies are correspondingly arranged between two adjacent support pile bodies, the support pile body comprises a pile body, a buried protrusion and an external connecting protrusion, the bottom of the pile body has a pile tip and is used to drill into the bottom rock layer of the foundation pit, the buried protrusion is arranged on the circumferential surface of the pile body and faces the slope of the foundation pit, and the external connecting protrusion The protrusion is arranged on the slope position of the outer peripheral surface of the pile body away from the foundation pit; the support blocking assembly includes a support baffle, an external support structure and a plurality of rock anchors; the two ends of the support baffle are respectively connected to the external connection protrusions in the two supporting pile bodies, and the back of the support baffle is against the filler layer; a plurality of rock anchors are evenly spaced on the support baffle, one end of the rock anchor passes through the filler layer and drilled into the slope rock layer of the foundation pit, and the other end of the rock anchor passes through the support baffle and is connected to the external support structure, the bottom of the external support structure is anchored on the rock layer at the bottom of the foundation pit, and the top of the external support structure is connected to the end face of the support baffle away from the filler layer, and is fastened together with the end of the rock anchor.
[0007] On the basis of the above technical solutions, the present invention also provides the following optional technical solutions:
[0008] In an optional solution, the buried protrusion is arranged along the axis direction of the pile body, and the cross section of the buried protrusion is T-shaped.
[0009] In an optional solution: the interior of the pile body is hollow and concrete is poured inside, the external connecting protrusion includes an insert block and an external fixing strip, one side of the insert block is radially inserted into the interior of the pile body, the external fixing strip is provided on the side of the insert block away from the pile body, the external fixing strip is fastened together with the side of the supporting baffle by bolts, and the side of the insert block extending into the pile body is provided with an internal fixing strip, and the internal fixing strip is solidified together with the concrete in the pile body.
[0010] In an optional scheme: the external support base plate, the diagonal support rod assembly and the multiple guard plate supporting assemblies, the external support base plate is laid on the bottom surface of the foundation pit, the two ends of the external support base plate are respectively connected to the outer walls of the two supporting pile bodies, the external support base plate has anchor nails nailed into the rock layer of the bottom wall of the foundation pit, the diagonal support rod assembly is against the end face of the supporting baffle and is connected to the end of the rock layer anchor, multiple guard plate supporting assemblies are linearly and evenly distributed on the external support base plate, one end of the guard plate supporting assembly is connected to the external support base plate and the other end is connected to the diagonal support rod assembly.
[0011] In an optional solution: the guard plate supporting assembly includes a plurality of cross support rod frames, and the plurality of cross support rod frames are distributed at equal intervals in a vertical linear manner. Pile body connection blocks are provided at both ends of the cross support rod frames, and the pile body connection blocks are connected to the side of the external connection protrusion away from the pile body. The cross support rod frames have a plurality of anchor connection holes, and the ends of the rock formation anchors away from the filler layer pass through the corresponding anchor connection holes and are fastened together by bolts. A plurality of intermediate support frames are also provided between adjacent two cross support rod frames, and the ends of the diagonal support rod assembly away from the external support base plate are connected to the middle of the corresponding intermediate support frames.
[0012] In an optional solution: the middle support frame is X-shaped, and the support points at the upper and lower ends are respectively connected to the side walls of the two horizontal support rod frames, and the end of the diagonal support rod assembly away from the outer support base plate is connected to the center of the middle support frame.
[0013] In an optional scheme: the diagonal support rod assembly includes a diagonal support rod, a lower anchor support and a tensioning connection part, one end of the diagonal support rod is connected to the outer support base plate through a lower hinge seat, and the other end of the diagonal support rod is connected to the center position of the middle support frame, and the lower anchor support is located on the upper surface of the outer support base plate close to the support baffle member, and the lower anchor support is provided with a lower anchor and the lower anchor passes through the outer support base plate and is anchored to the rock layer of the bottom wall of the foundation pit; the tensioning connection part includes a barrel part and two tensioning screws, and the two tensioning screws are respectively inserted into the interior of the barrel part from both ends and spirally matched with it, and the end of one of the tensioning screws away from the barrel part is hinged to the lower anchor support, and the end of the other tensioning screw away from the barrel part is hinged to the middle part of the diagonal support rod through the middle hinge seat.
[0014] By adopting the above technical solution, the present invention has the following beneficial effects:
[0015] The present invention provides a support structure for deep foundation pits with high water levels. The bottom of the supporting pile body is embedded in a stable rock layer. Combined with the synergistic effect of the buried protrusion and the filler layer, it effectively resists soil pressure and reduces the risk of pile overturning; the filler layer absorbs groundwater and blocks soil from falling, and the supporting baffle further prevents leakage; the buried protrusion transmits vibration to the filler layer to disperse the impact, thereby improving the overall seismic performance; the rock anchor and the external support structure form a three-dimensional support network, which enhances the deformation resistance of the supporting baffle and prevents it from bulging and failing; the supporting pile body is fixed by piling, and the supporting blocking components are modularly installed, which can adapt to complex geological conditions while reducing construction costs. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0017] Figure 1 The figure is a schematic diagram of the installation structure of the support structure in one embodiment of the present invention.
[0018] Figure 2 This is a schematic diagram of the axial structure of the support structure in one embodiment of the present invention.
[0019] Figure 3 This is a schematic structural diagram of a supporting pile body from one perspective in an embodiment of the present invention.
[0020] Figure 4 This is a schematic structural diagram of the support pile body from another perspective in an embodiment of the present invention.
[0021] Figure 5Schematic diagram of the support mechanism structure in one embodiment of the present invention.
[0022] Figure 6 Schematic diagram of the external support structure in one embodiment of the present invention.
[0023] Figure 7 Schematic diagram of the structure of the diagonal brace assembly in one embodiment of the present invention.
[0024] Notes on the accompanying drawings: foundation pit 100, filling layer 200, supporting pile body 300, pile shaft 310, pile tip 311, buried protrusion 320, external connection protrusion 330, insert block 331, external fixing strip 332, internal fixing strip 333, supporting baffle 400, external support structure 500, external support base plate 510, anchor nail 511, diagonal support rod assembly 520, diagonal support rod 521, lower hinge seat 522, lower anchor support 523, lower anchor 524, middle hinge seat 525, tightening screw 526, screw barrel 527, guard plate supporting assembly 530, cross support rod frame 531, anchor connection hole 532, middle support frame 533, pile body connecting block 534, rock formation anchor 600. DETAILED DESCRIPTION
[0025] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.
[0026] The left, right, up, and down positions of the components shown in the accompanying drawings are merely one arrangement, and the specific positions are set according to specific needs.
[0027] In one embodiment, Figure 1-Figure 5As shown, a support structure for a high-water-level deep foundation pit comprises a support mechanism arranged at the slope of a foundation pit 100, wherein a filler is filled between the support mechanism and the slope of the foundation pit 100 to form a filler layer 200; the support mechanism comprises a plurality of support pile bodies 300 and a plurality of support blocking assemblies, wherein the plurality of support pile bodies 300 are arranged side by side at the slope of the foundation pit 100 and the bottoms of the support pile bodies 300 are inserted into the bottom rock formation of the foundation pit 100, and the support blocking assemblies are correspondingly arranged between two adjacent support pile bodies 300, the support pile bodies 300 comprise a pile body 310, a buried protrusion 320 and an external connection protrusion 330, the pile body 310 has a pile tip 311 at the bottom and is used to drill into the bottom rock formation of the foundation pit 100, the buried protrusion 320 is arranged on the circumferential surface of the pile body 310 and faces the slope of the foundation pit 100, and the external connection protrusion 330 is arranged The outer peripheral surface of the pile body 310 is away from the slope position of the foundation pit 100; the support blocking assembly includes a support baffle 400, an external support structure 500 and a plurality of rock anchors 600; the two ends of the support baffle 400 are respectively connected to the external connecting protrusions 330 in the two support pile bodies 300, and the back of the support baffle 400 is against the filler layer 200; a plurality of rock anchors 600 are evenly spaced on the support baffle 400, one end of the rock anchor 600 passes through the filler layer 200 and is drilled into the slope rock layer of the foundation pit 100, and the other end of the rock anchor 600 passes through the support baffle 400 and is connected to the external support structure 500, the bottom of the external support structure 500 is fastened to the rock layer at the bottom of the foundation pit 100, and the top of the external support structure 500 is connected to the end face of the support baffle 400 away from the filler layer 200, and is fastened together with the end of the rock anchor 600.
[0028] In the embodiment of the present invention, during construction, multiple support pile bodies 300 are fixed on the slope of the foundation pit 100 in a pile-driving manner, and the multiple support pile bodies 300 are evenly spaced along the bottom edge of the slope of the foundation pit 100; one end of multiple rock anchors 600 is nailed into the slope rock layer of the support pile bodies 300, and the support blocking assembly is installed, and the support baffle 400 is placed between two adjacent support pile bodies 300, and the two ends of the support baffle 400 are respectively connected to the two support pile bodies 300. 0 is connected together with the side of the external connection protrusion 330; wherein, the end of the rock anchor 600 away from the slope of the foundation pit 100 passes through the supporting baffle 400, the external support structure 500 is placed in the foundation pit 100 and distributed along the corresponding supporting baffle 400, the top of the external support structure 500 is against the end surface of the supporting baffle 400 and is connected to the end of the multiple rock anchors 600 away from the slope of the foundation pit 100, so that the multiple rock anchors 600 connect the external support structure 500. 00, the support baffle 400 and the slope of the foundation pit 100 are connected together to increase the stability and impedance of the support baffle 400, and the top of the external support structure 500 is against the end face of the support baffle 400 to prevent it from bulging; finally, the filler is placed between the support baffle 400 and the slope of the foundation pit 100 to form a filler layer 200. The filler layer 200 and the support baffle 400 can effectively prevent the soil on the slope from falling and the filler layer 200 can absorb the leakage at the slope. groundwater; the supporting baffle 400 can also prevent groundwater from leaking from the filling layer 200; the bottom of the pile body 310 extends into the stable rock layer of the foundation pit 100, which can effectively support the entire support mechanism, and the buried protrusion 320 is pre-buried in the filling layer 200, which can transmit vibration to the filling layer 200 to reduce the impact caused by vibration and improve the stability of the entire support mechanism. At the same time, the setting of the buried protrusion 320 can also limit the pile body 310 from tipping into the interior of the foundation pit 100.
[0029] In one embodiment, Figure 1-Figure 5 As shown, the buried protrusion 320 is arranged along the axial direction of the pile body 310, and the cross-section of the buried protrusion 320 is T-shaped; in the embodiment of the present invention, the filler layer 200 is located between the support baffle 400 and the slope of the foundation pit 100, so the pile body 310 and the buried protrusion 320 are both buried inside the filler layer 200 to increase the stability of the supporting pile body 300; since the cross-section of the buried protrusion 320 is T-shaped, when the supporting pile body 300 tilts in the direction away from the slope of the foundation pit 100, the buried protrusion 320 with a T-shaped cross-section significantly increases the anti-overturning moment through the bite action of its transverse flange and the filler layer 200.
[0030] In one embodiment, Figure 1-Figure 5As shown, the interior of the pile body 310 is hollow and filled with concrete. The external connecting protrusion 330 includes an insert block 331 and an external fixing strip 332. One side of the insert block 331 is radially inserted into the interior of the pile body 310. The external fixing strip 332 is provided on the side of the insert block 331 away from the pile body 310. The external fixing strip 332 is fastened to the side of the supporting baffle 400 by bolts. The side of the insert block 331 extending into the pile body 310 is provided with an internal fixing strip 333. The internal fixing strip 333 is solidified together with the concrete in the pile body 310. In the embodiment of the present invention, when filling Before filling and injecting concrete into the pile body 310, the side edges of the support baffle 400 are fixed together with the outer fixing strips 332. Since the insert portion 331 can slide radially relative to the pile body 310, the position of the support baffle 400 can be adjusted as needed. Then, concrete is injected into the pile body 310. After the concrete solidifies, the inner fixing strips 333 can be fixed and the positions of the outer fixing strips 332 and the support baffle 400 can be stabilized. Finally, filler is filled between the support baffle 400 and the slope. Therefore, before installation, the position of the support baffle 400 can be adjusted as needed to change the volume of the filler layer 200.
[0031] In one embodiment, Figure 1-Figure 7 As shown, the outer support base plate 510, the oblique support rod assembly 520 and the plurality of guard plate abutting assemblies 530, the outer support base plate 510 is laid on the bottom surface of the foundation pit 100, and the two ends of the outer support base plate 510 are respectively connected to the outer walls of the two supporting pile bodies 300, and the outer support base plate 510 has anchor nails 511 nailed into the rock formation of the bottom wall of the foundation pit 100, the oblique support rod assembly 520 abuts against the end surface of the supporting baffle 400 and is connected to the end of the rock formation anchor 600, and the plurality of guard plate abutting assemblies 530 are linearly and equidistantly distributed on the outer support base plate 510, one end of the guard plate abutting assembly 530 is connected to the outer support base plate 510 and the other end is connected to the oblique support rod assembly 520; in this embodiment of the present invention, the outer support base plate 5 10 is fastened to the bottom wall of the foundation pit 100 through the anchor nails 511, thereby establishing a connection between the rock layer of the bottom wall of the foundation pit 100 and the entire external support structure 500, which can limit the horizontal movement of the external support base plate 510; the guard plate supporting assembly 530 is laid on the surface of the supporting baffle 400 and is connected to the external support base plate 510 by using the diagonal support rod assembly 520. The diagonal support rod assembly 520 uses an oblique support method to ensure that the guard plate supporting assembly 530 always maintains contact with the surface of the supporting baffle 400, and then uses the connection between the external support base plate 510 and the rock layer of the bottom wall of the foundation pit 100 to provide more stable support; multiple diagonal support rod assemblies 520 play a supporting role at multiple positions, which can disperse the supporting force and avoid the supporting baffle 400 from being depressed or convex due to concentrated force.
[0032] In one embodiment, Figure 1-Figure 7As shown, the guard plate supporting assembly 530 includes a plurality of transverse supporting rods 531, and the plurality of transverse supporting rods 531 are distributed at equal intervals in a vertical linear manner. Pile body connecting blocks 534 are provided at both ends of the transverse supporting rods 531. The pile body connecting blocks 534 are connected to the side of the outer connecting protrusion 330 away from the pile body portion 310. The transverse supporting rods 531 have a plurality of anchoring connection holes 532. The ends of the rock formation anchors 600 away from the filler layer 200 pass through the corresponding anchoring connection holes 532 and are fastened together by bolts. A plurality of intermediate supporting rods 533 are also provided between two adjacent transverse supporting rods 531. The diagonal support rod assembly 520 The end away from the outer support base plate 510 is connected to the middle of the corresponding intermediate support frame 533; in the embodiment of the present invention, the setting of multiple cross support rods 531 can establish a connection between two adjacent support pile bodies 300 to disperse the impact force borne by the support pile bodies 300 and improve the support strength; multiple cross support rods 531 and intermediate support frames 533 form a mesh structure to support the outer surface of the support baffle 400, thereby performing multi-point support, and utilizing the force transmission formed by the connection to disperse the concentrated force received, and avoid the concentrated stress on the support baffle 400 caused by the filler layer 200 and the seepage water pressure.
[0033] In one embodiment, Figure 1-Figure 7 As shown, the middle support frame 533 is X-shaped, and the support points at the upper and lower ends are respectively connected to the side walls of the two cross support rod frames 531, and the end of the diagonal support rod assembly 520 away from the outer support base plate 510 is connected to the center of the middle support frame 533; in this embodiment of the present invention, the connection between the middle support frame 533 and the cross support rod frame 531 is through the two support points at the end, and the supporting force of the diagonal support rod assembly 520 on the middle support frame 533 is respectively transmitted to the cross support rod frame 531 by its two support points, thereby further dispersing the force. The middle support frame 533 can increase the contact surface with the support baffle member 400 and reduce its surface bulge.
[0034] In one embodiment, Figure 1-Figure 7As shown, the diagonal support rod assembly 520 includes a diagonal support rod 521, a lower anchor support 523 and a tensioning connection portion, one end of the diagonal support rod 521 is connected to the outer support base plate 510 through a lower hinge seat 522, and the other end of the diagonal support rod 521 is connected to the center position of the intermediate support frame 533, the lower anchor support 523 is located on the upper surface of the outer support base plate 510 near the support baffle 400, and a lower anchor 524 is provided on the lower anchor support 523, and the lower anchor 524 passes through the outer support base plate 510 and is anchored to the rock formation on the bottom wall of the foundation pit 100; the tensioning connection portion includes a screw barrel portion 527 and two tensioning screws 526, the two tensioning screws 526 are respectively inserted into the interior of the screw barrel portion 527 from both ends and spirally matched therewith, and one of the tensioning screws 526 is away from the screw barrel portion 52 The end of 7 is hinged to the lower anchor support 523, and the end of another tightening screw 526 away from the screw barrel part 527 is hinged to the middle part of the diagonal support rod 521 through the intermediate hinge seat 525; in the embodiment of the present invention, the setting of the tightening connection part and the lower anchor 524 can anchor the middle position of the diagonal support rod 521 and the rock layer of the bottom wall of the foundation pit 100 together, and the screw barrel part 527 is screwed, and the screw barrel part 527 utilizes its own spiral cooperation with the tightening screw 526, and the tightening screw 526 can be screwed in or out of the screw barrel part 527, thereby changing the length of the entire tightening connection part, so that the diagonal support rod 521 is always subjected to the tension from the tightening connection part, thereby improving the supporting strength of the diagonal support rod 521 to the intermediate support 533, and reducing the tendency of the diagonal support rod assembly 520 to flip outward due to the force applied to the support baffle member 400.
[0035] The above embodiment provides a support structure for a deep foundation pit with a high water level, and its working principle is as follows:
[0036] 1. Overall structure and function
[0037] This support structure is mainly used for slope support of deep foundation pits with high water levels and consists of the following core parts:
[0038] The supporting pile body 300 is driven vertically into the rock layer at the bottom of the foundation pit 100 to form the main supporting skeleton.
[0039] Support and blocking assembly: includes support and blocking plate members 400, external support structures 500 and rock anchor members 600, used to reinforce slopes and resist water and soil pressure.
[0040] Filling layer 200: Filled between the supporting baffle 400 and the slope of the foundation pit 100, absorbing groundwater and dispersing soil pressure.
[0041] 2. Anchoring and stabilization of the support pile body 300
[0042] The pile body 310 is inserted into the stable rock layer at the bottom of the foundation pit 100 through the pile tip 311 to provide vertical bearing capacity.
[0043] The buried protrusion 320 (T-shaped cross section) is pre-buried in the filler layer 200 and has the following functions:
[0044] The pile body 310 is restricted from tilting toward the inside of the foundation pit 100 ; the vibration is transmitted to the filler layer 200 , and the energy is absorbed by the filler to reduce the impact.
[0045] The outer connection protrusion 330 is adjustably connected to the pile body through the insert block 331, which facilitates the installation and positioning of the support baffle member and fixes the overall structure after pouring concrete.
[0046] 3. Collaborative work of support and blocking components
[0047] The retaining plate 400 is bolted to the outer connecting protrusions 330 of the adjacent retaining pile body 300 at both ends to form a continuous retaining wall. The back of the retaining plate rests against the filler layer 200 to prevent soil from sliding down the slope and groundwater from seeping in.
[0048] The rock anchor 600 has one end anchored into the slope rock layer and the other end passes through the support baffle 400 and is connected to the external support structure 500, thereby binding the slope rock layer, the support baffle 400 and the rock layer at the bottom of the foundation pit 100 into a whole, thereby enhancing the anti-overturning ability.
[0049] External support structure 500:
[0050] External support base plate 510: Anchored to the rock layer at the bottom of the foundation pit through anchor nails 511 to prevent horizontal displacement.
[0051] The diagonal support rod assembly 520 obliquely supports the support baffle member 400 and applies a continuous pre-tightening force by tightening the connection part (adjusted by the screw barrel part 527) to prevent the support baffle member 400 from bulging.
[0052] The guard plate supporting assembly 530 is composed of a cross support rod frame 531 and an X-shaped middle support frame 533 to form a mesh support, which disperses the force on the supporting baffle member 400 and avoids local stress concentration.
[0053] 4. Auxiliary function of the packing layer 200
[0054] It is filled between the supporting baffle 400 and the slope to absorb seepage water and buffer soil pressure; it dissipates vibration energy together with the buried protrusion 320 to improve the seismic resistance of the structure.
[0055] 5. Dynamic adjustment and anti-deformation mechanism
[0056] Construction stage: The position of the support baffle can be adjusted through the insert block portion 331 to meet the requirements of different filler layer thicknesses.
[0057] In-use: The tensioning connection of the diagonal brace assembly 520 can be tightened by screwing the screw portion 527 to adjust the support force in real time to cope with changes in soil pressure. The X-shaped intermediate support 533 evenly transmits the support force to the cross support 531, preventing deformation of the support plate 400.
[0058] 6. Anti-seepage and drainage
[0059] The supporting baffle 400 blocks groundwater from leaking into the foundation pit 100 , and the filler layer 200 absorbs part of the seeping water to reduce the hydrostatic pressure.
[0060] In the description of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate and simplify the description of the present invention. They are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation, and therefore should not be construed as limitations on the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
Claims
1. A support structure for a deep foundation pit at a high water level, comprising a support mechanism provided at a slope of the foundation pit, characterized in that: A filler is filled between the support mechanism and the slope of the foundation pit to form a filler layer; the support mechanism includes a plurality of support pile bodies and a plurality of support blocking assemblies; A plurality of support pile bodies are arranged side by side on the slope of the foundation pit, and the bottoms of the support pile bodies are inserted into the bottom rock layer of the foundation pit, and the support blocking assembly is correspondingly arranged between two adjacent support pile bodies; The supporting pile body comprises a pile body, a buried protrusion and an external connection protrusion; The pile body has a pile tip at the bottom thereof and is used for drilling into the bottom rock layer of the foundation pit; the buried protrusion is provided on the circumferential surface of the pile body and faces the slope of the foundation pit; and the external connection protrusion is provided on the outer circumferential surface of the pile body and faces the slope away from the foundation pit. The support and blocking assembly includes a support and blocking plate member, an external support structure and a plurality of rock formation anchor members; The two ends of the support baffle are respectively connected to the external connection protrusions in the two support pile bodies, and the back of the support baffle is against the filler layer; Multiple rock anchors are evenly spaced on the support baffles. One end of the rock anchor passes through the filler layer and is drilled into the slope rock layer of the foundation pit. The other end of the rock anchor passes through the support baffle and is connected to the external support structure. The bottom of the external support structure is anchored on the rock layer at the bottom of the foundation pit, and the top of the external support structure is connected to the end face of the support baffle away from the filler layer and is fastened to the end of the rock anchor.
2. The supporting structure for a high water level deep foundation pit according to claim 1, characterized in that: The buried protrusion is arranged along the axial direction of the pile body, and the cross section of the buried protrusion is T-shaped.
3. The supporting structure for a high water level deep foundation pit according to claim 1, characterized in that: The pile body is hollow and filled with concrete, and the external connection protrusion includes an insert block and an external fixing strip; One side of the insert block is radially inserted into the interior of the pile body, and an external fixing strip is provided on the side of the insert block away from the pile body. The external fixing strip is fastened together with the side of the supporting baffle by bolts, and an internal fixing strip is provided on the side of the insert block extending into the pile body, and the internal fixing strip is solidified together with the concrete in the pile body.
4. The supporting structure for a high water level deep foundation pit according to claim 3, characterized in that: The outer support base plate, the diagonal support rod assembly and the plurality of guard plate support assemblies; The external support base plate is laid on the bottom surface of the foundation pit, and the two ends of the external support base plate are respectively connected to the outer walls of the two supporting pile bodies. The external support base plate has anchor nails nailed into the rock layer of the bottom wall of the foundation pit; The diagonal support rod assembly rests on the end face of the supporting baffle and is connected to the end of the rock anchor. Multiple guard plate support assemblies are linearly and evenly distributed on the outer support base plate. One end of the guard plate support assembly is connected to the outer support base plate and the other end is connected to the diagonal support rod assembly.
5. The supporting structure for a high water level deep foundation pit according to claim 4, characterized in that: The guard plate abutment assembly includes a plurality of transverse abutment rod brackets; A plurality of horizontal rod frames are distributed at equal intervals in a vertical linear manner, and a pile body connection block is provided at both ends of the horizontal rod frame, and the pile body connection block is connected to the side of the external connection protrusion away from the pile body portion; There are multiple anchoring connection holes on the cross rod frame. The end of the rock anchor away from the filler layer passes through the corresponding anchoring connection holes and is fastened together by bolts. There are also multiple intermediate supports between two adjacent cross rod frames. The end of the diagonal support rod assembly away from the external support base plate is connected to the middle of the corresponding intermediate support frame.
6. The supporting structure for a high water level deep foundation pit according to claim 5, characterized in that: The middle support frame is in an X shape, and the support points at the upper and lower ends thereof are respectively connected to the side walls of the two horizontal support rod frames, and the end of the diagonal support rod assembly away from the outer support base plate is connected to the center of the middle support frame.
7. The supporting structure for a high water level deep foundation pit according to claim 6, characterized in that: The diagonal brace assembly includes a diagonal brace, a lower anchor support and a tension connection portion; One end of the diagonal support rod is connected to the outer support base plate through a lower hinge seat, and the other end of the diagonal support rod is connected to the center position of the middle support frame. The lower anchor support is located on the upper surface of the outer support base plate near the support baffle member. The lower anchor support is provided with a lower anchor and the lower anchor passes through the outer support base plate and is anchored to the rock layer of the bottom wall of the foundation pit. The tightening connection part includes a screw barrel part and two tightening screws, which are respectively inserted into the interior of the screw barrel part from both ends and screwed together with it. The end of one of the tightening screws away from the screw barrel part is hinged to the lower anchor support, and the end of the other tightening screw away from the screw barrel part is hinged to the middle part of the diagonal support rod through the intermediate hinge seat.