CN118187098A - Deep foundation pit inner supporting method based on inner force adjustment - Google Patents
Deep foundation pit inner supporting method based on inner force adjustment Download PDFInfo
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/02—Foundation pits
- E02D17/04—Bordering surfacing or stiffening the sides of foundation pits
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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Abstract
The invention discloses a deep foundation pit inner supporting method based on internal force adjustment, which belongs to the technical field of deep foundation pit inner supporting methods and comprises the following steps: determining a foundation pit edge profile according to the position and the shape of a foundation pit, and arranging support piles at preset distances outside the foundation pit edge profile, wherein the support piles are embedded into preset depths below the ground; according to the foundation pit edge profile, a supporting structure is arranged, a supporting frame is constructed through the supporting structure, a stress monitoring device and an internal force adjusting piece are embedded in the supporting frame in the process of constructing the supporting frame, deformation and internal force change of the supporting frame are monitored in real time, and the internal force of the supporting frame is dynamically adjusted through the internal force adjusting piece. The invention realizes dynamic adjustment of internal force through the internal force adjusting piece, improves the stability and adaptability of the supporting structure, has the advantages of good flexibility and high stability, can be widely applied to deep foundation pit engineering under various geological environments, improves construction safety and reduces later maintenance cost.
Description
Technical Field
The invention belongs to the technical field of deep foundation pit internal support methods, and particularly relates to an internal force adjustment-based deep foundation pit internal support method.
Background
The deep foundation pit inner supporting method based on internal force adjustment is an important technology for ensuring the construction stability of high-rise buildings. The supporting method mainly maintains the stability of the foundation pit by adjusting the internal force of the soil body, and prevents the soil body from collapsing or sliding in the excavating process. In the deep foundation pit internal supporting method based on internal force adjustment, common supporting structures comprise soil nailing walls, underground continuous walls, row piles and the like. The supporting structures resist the lateral pressure of the soil body and the bottom bulge by forming a certain supporting force around the foundation pit, so that the stability of the foundation pit is maintained. Specifically, the soil nailing wall supporting method utilizes the friction force between soil nails and soil mass to provide supporting force by driving the soil nails on the side slope of the foundation pit. The length and diameter of the soil nails are designed according to geological conditions and the depth of the foundation pit so as to ensure sufficient supporting effect. The underground continuous wall supporting method is to pour continuous reinforced concrete walls around the foundation pit, and the supporting is provided by the bending resistance and the compression resistance of the walls. The underground diaphragm wall has higher bearing capacity and rigidity, and is suitable for supporting large-scale deep foundation pit. The method for supporting the row piles utilizes the driven or poured pile bodies to provide supporting force. The pile body can be a reinforced concrete pile or a steel pipe pile, and the lateral pressure and bottom bulge of the soil body are resisted through the interaction of the pile body and the soil body.
With the rapid development of urban construction, deep foundation pit engineering is increasingly used in various construction projects. Due to complex and changeable geological conditions, the traditional support method is difficult to adapt to deformation caused by various geological environments. Therefore, the deep foundation pit inner supporting method based on the inner force adjustment is designed, and the inner force of the system is adjusted through the inner force adjusting piece so as to adapt to the deformation of different geological environments, realize the effect of supporting stability, and have important practical significance. Moreover, it is necessary to design an internal force adjusting member which is convenient to disassemble and assemble and is not easy to damage so as to adjust the internal force of the supporting frame.
Disclosure of Invention
Aiming at the problems existing in the prior art, the invention provides the deep foundation pit inner supporting method based on the internal force adjustment, which has the advantages of being capable of realizing the internal force adjustment so as to adapt to the deformation of different geological environments and realizing the effect of supporting stability, and solves the problems in the prior art.
The invention discloses a deep foundation pit inner supporting method based on inner force adjustment, which comprises the following steps:
Determining a foundation pit edge profile according to the position and the shape of a foundation pit, and arranging support piles at preset distances outside the foundation pit edge profile, wherein the support piles are embedded into preset depths below the ground; setting a supporting structure according to the edge profile of the foundation pit, and constructing a supporting frame through the supporting structure; in the process of building the support frame, the stress monitoring device and the internal force adjusting piece are embedded in the support frame, deformation and internal force change of the support frame are monitored in real time, and the internal force of the support frame is dynamically adjusted through the internal force adjusting piece.
Preferably, the support frame includes: the upper supporting structure is transversely arranged, and two ends of the upper supporting structure are fixedly connected with the supporting piles respectively; the lower support structure is transversely arranged, and two ends of the lower support structure are fixedly connected with the support piles respectively; the upper end of the connecting structure is fixedly connected with the upper supporting structure, and the lower end of the connecting structure is fixedly connected with the lower supporting structure; the tensioning structure comprises a tensioning rod and a tensioning steel rope, the tensioning rod is connected to the upper side of the upper supporting structure, the tensioning steel rope is connected to the upper end of the tensioning rod, and the end part of the tensioning steel rope is connected to the upper end of the supporting pile; the bearing structure is obliquely arranged, the upper end of the bearing structure is connected with the lower end of the lower supporting structure, and the lower end of the bearing structure is rotatably connected with the supporting pile; wherein, at least one of the upper supporting structure, the lower supporting structure, the connecting structure, the tensioning structure and the bearing structure is provided with an internal force adjusting piece.
As a preferred aspect of the present invention, the upper support structure is formed by connecting a plurality of first rod-shaped members end to end, the lower support structure is formed by connecting a plurality of second rod-shaped members end to end, and the bearing structure is formed by one or a plurality of third rod-shaped members; the internal force adjusting piece is arranged on the first rod-shaped piece, the second rod-shaped piece, the third rod-shaped piece and the tension rod; and/or the internal force adjusting piece is arranged between two adjacent first rod-shaped pieces, and/or the internal force adjusting piece is arranged between two adjacent second rod-shaped pieces, and/or the internal force adjusting piece is arranged between two adjacent third rod-shaped pieces.
Preferably, the internal force adjuster includes: the hydraulic device comprises a first fixing seat, a second fixing seat, a first mounting seat, a second mounting seat, a hydraulic cylinder and a guide assembly, wherein the first fixing seat is fixedly connected to the end part of one rod-shaped piece, the second fixing seat is fixedly connected to the end part of the other rod-shaped piece, the first mounting seat is detachably and fixedly connected to the first fixing seat, the second mounting seat is detachably and fixedly connected to the second fixing seat, one end of the hydraulic cylinder is connected to the first mounting seat, the other end of the hydraulic cylinder is connected to the second mounting seat, the guide assembly is provided with a plurality of guide assemblies, one end of the guide assembly is connected to the first mounting seat, and the other end of the guide assembly is fixedly connected to the second mounting seat; and a plurality of guide assemblies are arranged at equal intervals in an annular shape relative to the hydraulic cylinder.
As preferable, the first fixing seat is provided with a first connecting hole, the first mounting seat comprises a base and a lifting table, the lifting table is connected to the base through threads in a rotating mode, a fixed ring is fixedly connected to the lifting table, a bearing is fixedly connected to the inside of the fixed ring, a bearing block is fixedly connected to an inner ring of the bearing, a supporting piece is fixedly connected to the lifting table, one end of the bearing block is attached to the supporting piece, and the other end of the bearing block is fixedly connected to the end portion of the hydraulic cylinder.
As a preferred aspect of the present invention, the guide assembly includes a guide rod and a guide sleeve, one end of the guide rod is connected to the base through a thread, the guide rod is aligned with the first connection hole, one end of the guide sleeve is fixedly connected to the second mounting seat, and the guide rod is slidably inserted into the guide sleeve.
As preferable, the upper end of the first mounting seat is fixedly connected with an L-shaped buckle, the L-shaped buckle can be clamped on the first fixing seat, a second connecting hole is formed in the L-shaped buckle, and the second connecting hole can be aligned with the first connecting hole.
As the preferable mode of the invention, the edge of the lifting platform is attached to the guide rod, the edge of the lifting platform is provided with a plurality of notches at equal intervals in a ring shape, the guide rod is fixedly or in threaded connection with a first clamping block, and the first clamping block can be clamped in the notches.
Preferably, a collar is fixedly connected between the guide sleeves.
As a preferable mode of the invention, the guide sleeve is provided with a through hole, the through hole is positioned at one side of the lantern ring, one side of the lantern ring is provided with an annular groove, the annular groove is rotationally connected with a swivel, one side of the swivel extends to the outer side of the annular groove, and the outer ring of the swivel is fixedly connected with a second clamping block; a plurality of clamping grooves are formed in the guide rod, the second clamping blocks can be clamped in the through holes and the clamping grooves through rotating the swivel rings, locking pieces are arranged on the lantern rings, and the locking pieces can lock the swivel rings and the lantern rings.
Compared with the prior art, the invention has the following beneficial effects:
1. According to the deep foundation pit internal supporting method based on internal force adjustment, the edge profile is determined according to the position and the shape of the foundation pit, the supporting piles and the supporting structure are arranged, the stress monitoring device and the internal force adjusting piece are embedded in the supporting frame, the internal force of the supporting frame is monitored and adjusted in real time, and the problems that the traditional supporting mode is poor in adaptability and poor in stability are solved. According to the method, dynamic adjustment of internal force is realized through the internal force adjusting piece, stability and adaptability of the supporting structure are improved, and the method has the advantages of being good in flexibility and high in stability, can be widely applied to deep foundation pit engineering in various geological environments, improves construction safety, and reduces later maintenance cost.
2. The internal force adjusting member applies or releases force to the rod-shaped member by the expansion and contraction of the hydraulic cylinder, thereby realizing the tightening or loosening of the rod-shaped member. Meanwhile, the guide assembly ensures that the internal force adjusting piece can only axially move, the stability of the device is ensured, and the damage of the hydraulic cylinder is prevented. Such an arrangement is particularly useful in applications where flexible adjustment of the stress of the rod-like members is required, such as buildings, bridges or other structures where precise stress control is required. By means of accurate control of the hydraulic system, the stress of the rod-shaped piece can be adjusted rapidly and accurately, and therefore safety and stability of the structure are improved.
Drawings
FIG. 1 is a schematic view of a front view of a support frame according to the present invention;
fig. 2 is a schematic perspective view of an internal force adjuster according to embodiment 1 of the present invention;
FIG. 3 is an enlarged schematic view of the portion A in FIG. 2 according to embodiment 1 of the present invention;
FIG. 4 is a schematic top view of an internal force adjuster according to embodiment 1 of the present invention;
FIG. 5 is a schematic cross-sectional view of the portion B-B of FIG. 4 provided in example 1 of the present invention;
FIG. 6 is an enlarged schematic view of the portion D in FIG. 5 according to embodiment 1 of the present invention;
FIG. 7 is a schematic cross-sectional view of the portion C-C of FIG. 4 provided in example 1 of the present invention;
FIG. 8 is an enlarged schematic view of the portion E in FIG. 7 according to embodiment 1 of the present invention;
Fig. 9 is a schematic perspective view of an internal force adjuster according to embodiment 2 of the present invention;
fig. 10 is an enlarged schematic view of the structure of the portion F in fig. 9 provided in embodiment 2 of the present invention.
In the figure: 1. an internal force adjusting member; 2. an upper support structure; 3. a lower support structure; 4. a connection structure; 5. tensioning the structure; 51. a tension rod; 52. tensioning the steel rope; 6. a load bearing structure; 7. a first fixing seat; 8. the second fixing seat; 9. a first mount; 91. a base; 92. a lifting table; 93. a fixing ring; 94. a bearing; 95. a bearing block; 96. a support; 10. a second mounting base; 11. a hydraulic cylinder; 12. a guide assembly; 121. a guide rod; 122. guide sleeve; 13. a first connection hole; 14. an L-shaped buckle; 15. a second connection hole; 16. a notch; 17. a first clamping block; 18. a collar; 19. a through hole; 20. an annular groove; 21. a swivel; 22. a second clamping block; 23. a clamping groove; 24. a locking piece.
Detailed Description
For a further understanding of the invention, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings.
The structure of the present invention will be described in detail with reference to the accompanying drawings.
Example 1
The deep foundation pit inner supporting method based on the internal force adjustment provided by the embodiment of the invention comprises the following steps:
Determining a foundation pit edge profile according to the position and the shape of a foundation pit, and arranging support piles at preset distances outside the foundation pit edge profile, wherein the support piles are embedded into preset depths below the ground; setting a supporting structure according to the edge profile of the foundation pit, and constructing a supporting frame through the supporting structure to ensure that the supporting frame has enough rigidity and strength; in the process of building the support frame, the stress monitoring device and the internal force adjusting piece are embedded in the support frame, deformation and internal force change of the support frame are monitored in real time, and the internal force of the support frame is dynamically adjusted through the internal force adjusting piece.
The embodiment of the invention provides a deep foundation pit inner supporting method based on inner force adjustment, which aims to solve the problems of poor adaptability and insufficient stability of the traditional supporting mode to geological changes. The method achieves dynamic adjustment of forces within the support frame through a series of well-designed steps and devices, thereby enhancing stability and adaptability of the support structure.
Firstly, determining the outline of the edge of the foundation pit according to the position and the shape of the foundation pit, and arranging supporting piles at a preset distance outside the outline. The preset depth of the supporting piles embedded into the ground provides a stable foundation for the whole supporting structure. This step ensures that the support piles are able to effectively withstand the pressure from the soil and groundwater, providing a stable working environment for the subsequent construction of the support structure. Next, a support structure is set according to the edge profile of the foundation pit, and a support frame is constructed. In this process, particular attention is paid to the rigidity and strength of the support frame, ensuring that it can withstand the pressure and deformation from inside the foundation pit. Through scientific design and accurate construction, braced frame provides the safety guarantee for excavation and follow-up construction of foundation ditch. During the construction of the support frame, the stress monitoring device and the internal force adjusting member are embedded. The device can monitor the deformation and the internal force change of the supporting frame in real time, and dynamically adjust the internal force of the supporting frame through the internal force adjusting piece. The design enables the supporting structure to adjust the state of the supporting structure in real time according to geological changes, and the optimal supporting effect is maintained.
Specific operation steps comprise initial state setting, real-time monitoring, data analysis and internal force adjustment. And an initial state setting stage, namely setting initial parameters of the internal force adjusting piece according to the geological survey report and engineering requirements. And in the real-time monitoring stage, the deformation and internal force change of the supporting structure are monitored in real time by using a sensor. And in the data analysis stage, real-time monitoring data are input into an intelligent control system for processing and analysis, and the stability of the supporting structure is judged. And an internal force adjusting stage, namely adjusting parameters of the internal force adjusting piece according to the data analysis result, and dynamically adjusting the internal force of the supporting structure. The method realizes dynamic adjustment of the internal force through the internal force adjusting piece and has the advantages of good flexibility and high stability. The internal force adjusting piece can adjust internal force distribution in real time according to geological deformation degree, and is suitable for different geological conditions. Meanwhile, the influence of geological deformation on the supporting structure is effectively resisted by controlling the internal force distribution, and the supporting stability is improved. The innovative supporting method not only improves the construction safety, but also reduces the later maintenance cost, and has wide application prospect.
In conclusion, the deep foundation pit inner supporting method based on the internal force adjustment is designed to realize dynamic adjustment of the internal force through the internal force adjusting piece, has the advantages of good flexibility and high stability, and can be widely applied to deep foundation pit engineering in various geological environments.
In the process of building the support frame, the stress monitoring device and the internal force adjusting piece are embedded in the support frame, deformation and internal force change of the support frame are monitored in real time, and the internal force of the support frame is dynamically adjusted through the internal force adjusting piece, and the method specifically comprises the following steps:
Step one: preliminary construction of supporting framework
1. Selecting a suitable material: according to the use environment and the stress requirement of the supporting frame, materials with the strength, the rigidity and the stability meeting the requirements are selected.
2. And (3) designing a frame structure: according to actual requirements and application scenes, the whole structure of the supporting frame is designed, and the stability and the bearing capacity of the supporting frame are ensured.
3. Building a frame: according to the designed structure, the components are assembled by using proper connection modes and tools to form the preliminary structure of the supporting frame.
Step two: embedding of stress monitoring device
1. Selecting a stress monitoring device: according to the characteristics of the support frame and the monitoring requirements, a proper stress monitoring device such as a strain gauge, a displacement sensor and the like is selected.
2. Determining a monitoring point: and determining the positions of stress monitoring points at key positions and stress concentration areas of the supporting frame.
3. Installing a monitoring device: on the selected monitoring points, the stress monitoring device is embedded into the supporting frame according to the installation requirement of the device, so that the stress monitoring device is tightly attached to the frame, and the change of stress can be accurately monitored.
Step three: embedding of internal force adjusting element
1. Selecting an internal force adjusting member: and selecting proper internal force adjusting parts, such as prestressed tendons, tensioning devices and the like, according to the adjusting requirements and the prestress control requirements of the supporting frame.
2. Determining an adjustment point: in the appropriate position of the support frame, the position of the prestressing adjustment points is determined, which should be able to effectively adjust the internal forces of the frame.
3. Installing an adjusting device: on the selected adjusting point, the internal force adjusting piece is embedded into the supporting frame according to the installation requirement of the device, so that firm and reliable connection between the internal force adjusting piece and the frame is ensured, and effective adjustment of the internal force can be realized.
Step four: real-time monitoring and dynamic adjustment
1. And (3) connecting a monitoring system: and the stress monitoring device is connected with the data acquisition system, so that deformation and internal force change data of the support frame can be obtained in real time.
2. Setting an early warning value: and setting an early warning value of stress change according to the safe use requirement of the support frame, and giving an alarm when the monitored stress exceeds the early warning value.
3. Dynamically adjusting the internal force: according to the stress change data monitored in real time, the internal force of the support frame is dynamically adjusted through the internal force adjusting piece, so that the stability and safety of the frame are ensured.
Through the refinement of the four steps, the task of embedding the stress monitoring device and the internal force adjusting piece in the process of building the supporting frame can be more clearly understood and executed, and the real-time monitoring and the dynamic adjustment of the deformation and the internal force change of the supporting frame are realized.
Referring to fig. 2, the support frame includes: an upper support structure 2, a lower support structure 3, a connection structure 4, a tensioning structure 5 and a load bearing structure 6. The upper supporting structure 2 is transversely arranged, and two ends of the upper supporting structure 2 are respectively and fixedly connected with the supporting piles; the lower supporting structure 3 is transversely arranged, and two ends of the lower supporting structure 3 are respectively and fixedly connected with the supporting piles; the upper end of the connecting structure 4 is fixedly connected with the upper supporting structure 2, and the lower end of the connecting structure 4 is fixedly connected with the lower supporting structure 3; the tensioning structure 5 comprises a tensioning rod 51 and a tensioning cable 52, the tensioning rod 51 is connected to the upper side of the upper supporting structure 2, the tensioning cable 52 is connected to the upper end of the tensioning rod 51, and the end of the tensioning cable 52 is connected to the upper end of the support pile; the bearing structure 6 is obliquely arranged, the upper end of the bearing structure 6 is connected with the lower end of the lower supporting structure 3, and the lower end of the bearing structure 6 is rotatably connected with the supporting piles;
Wherein at least one of the upper support structure 2, the lower support structure 3, the connecting structure 4, the tensioning structure 5 and the carrying structure 6 is provided with an internal force adjuster 1.
By the arrangement, the upper support structure 2 and the lower support structure 3 provide strong supporting force, and the connecting structure 4 connects the upper support structure 2 and the lower support structure to form a stable support system. The tightening structure 5 further enhances the stability and load bearing capacity of the support frame by tightening the tension of the steel cords 52. The inclined arrangement of the load-bearing structure 6 enables the support frame to be adapted to different terrain and support requirements. In addition, by providing the internal force adjusting member 1, the internal force of the support frame can be conveniently adjusted to adapt to different engineering requirements and environmental changes. In conclusion, the supporting frame has the characteristics of stability, adjustable internal force, good adaptability and the like, and a reliable supporting effect is provided for the supporting pile.
Referring to fig. 1, the upper support structure 2 is formed by connecting a plurality of first rod-shaped members end to end; the lower supporting structure 3 is formed by connecting a plurality of second rod-shaped pieces end to end; the carrying structure 6 is constituted by one or several third rod-like elements; the internal force adjusting member 1 is provided on the first, second, third and tension rods 51; and/or the internal force adjusting member 1 is arranged between two adjacent first rod-shaped members, and/or the internal force adjusting member 1 is arranged between two adjacent second rod-shaped members, and/or the internal force adjusting member 1 is arranged between two adjacent third rod-shaped members.
Referring to fig. 2, the internal force adjuster 1 includes: the device comprises a first fixing seat 7, a second fixing seat 8, a first mounting seat 9, a second mounting seat 10, a hydraulic cylinder 11 and a guide assembly 12; the first fixing seat 7 is fixedly connected to the end part of one rod-shaped piece; the second fixing seat 8 is fixedly connected to the end part of the other rod-shaped piece; the first mounting seat 9 is detachably and fixedly connected to the first fixing seat 7; the second mounting seat 10 is detachably and fixedly connected to the second fixing seat 8; one end of the hydraulic cylinder 11 is connected to the first mounting seat 9, and the other end of the hydraulic cylinder 11 is connected to the second mounting seat 10; the guide assemblies 12 are provided with a plurality of guide assemblies 12, one end of each guide assembly 12 is connected with the first mounting seat 9, and the other end of each guide assembly 12 is fixedly connected with the second mounting seat 10; and a plurality of guide assemblies 12 are arranged at equal intervals in a ring shape relative to the hydraulic cylinder 11.
The rod-shaped member may be a first rod-shaped member, a second rod-shaped member, or a third rod-shaped member. By this arrangement, if a force needs to be applied to the rod-like member, the hydraulic cylinder 11 can be driven to extend by the hydraulic system, so that the rod-like member can be tightened, and the stress at the corresponding position can be increased. The guiding component 12 is used for limiting the internal force adjusting piece 1, so that the internal force adjusting piece can only axially move and cannot bend, on one hand, the stability of the supporting frame is ensured, and on the other hand, the hydraulic cylinder 11 can be prevented from being bent or damaged.
Referring to fig. 5 and 6, the first fixing seat 7 is provided with a first connection hole 13, the first mounting seat 9 includes a base 91 and a lifting platform 92, the lifting platform 92 is rotationally connected to the base 91 through threads, a fixing ring 93 is fixedly connected to the lifting platform 92, a bearing 94 is fixedly connected to the fixing ring 93, a bearing block 95 is fixedly connected to an inner ring of the bearing 94, a supporting member 96 is fixedly connected to the lifting platform 92, one end of the bearing block 95 is attached to the supporting member 96, and the other end of the bearing block 95 is fixedly connected to an end of the hydraulic cylinder 11.
In the above arrangement, since the elevating platform 92 needs to be rotated, the elevating platform 92 and the hydraulic cylinder 11 are rotatably connected by the bearing 94. The supporting member 96 is used for preventing the bearing 94 from being damaged due to excessive axial force, and in order to increase the axial bearing capacity of the bearing 94, a needle bearing may be selected, and the supporting member 96 may be provided as a universal ball, which may support the bearing block 95, or may not hinder the rotation thereof. With this arrangement, the height of the elevating platform 92 can be adjusted before the main installation, and the limit length of the internal force adjuster 1 can be increased. Since the dimensions of the pit are not determined, and the length of the rod-like members is usually fixed, when connecting a plurality of rod-like members end to end, there is a case that one rod-like member is excessively long and the other rod-like member is excessively short without increasing the rod-like member, and at this time, compensation can be performed by adjusting the height of the elevating table 92. The axial length of the lifting platform 92 may be set as desired, for example, to half of the entire internal force adjuster 1.
Referring to fig. 2, the guide assembly 12 includes a guide rod 121 and a guide sleeve 122, one end of the guide rod 121 is connected to the base 91 through a thread, the guide rod 121 is aligned with the first connecting hole 13, one end of the guide sleeve 122 is fixedly connected to the second mounting seat 10, and the guide rod 121 is slidably inserted into the guide sleeve 122.
With this arrangement, during installation, the guide rod 121 can be rotated so that the threaded end of the guide rod 121 can pass through the first connecting hole 13, and at this time, only a nut is required to be screwed onto the threaded end of the guide rod 121 to fix the first mount 9 and the first fixing base 7 together. And by this arrangement, it is also possible to adjust the length of the guide rod 121, or to detach the guide rod 121. In addition, when the threaded end of the guide rod 121 penetrates the first connecting hole 13, the first connecting hole 13 can limit the guide rod 121 and prevent the guide rod from bending, so that the bearing effect can be increased.
Referring to fig. 7 and 8, an L-shaped buckle 14 is fixedly connected to the upper end of the first mounting seat 9, the L-shaped buckle 14 can be clamped to the first fixing seat 7, a second connecting hole 15 is formed in the L-shaped buckle 14, and the second connecting hole 15 can be aligned with the first connecting hole 13.
Through the arrangement, on one hand, the L-shaped buckle 14 is clamped on the first fixing seat 7, so that the first mounting seat 9 and the first fixing seat 7 can be pre-positioned, and the connection efficiency of the first mounting seat 9 and the first fixing seat 7 can be improved; on the other hand, the guide rod 121 may penetrate through the first connecting hole 13 and the second connecting hole 15, and connect the first mounting seat 9, the first fixing seat 7 and the L-shaped buckle 14 together through nuts, and the L-shaped buckle 14 may limit the first fixing seat 7 and the first mounting seat 9, so as to increase the connection strength of the two.
Referring to fig. 2 and 3, the edge of the lifting platform 92 is attached to the guide rod 121; the edge of the lifting platform 92 is annular and provided with a plurality of notches 16 at equal intervals; the guide rod 121 is fixedly or threadedly connected with a first clamping block 17, and the first clamping block 17 can be clamped in the notch 16.
In use, the height of the lifting platform 92 is adjusted, and after the adjustment is finished, one of the notches 16 is aligned with the guide rod 121, and then the guide rod 121 is rotated to enable the guide rod 121 to pass through the first connecting hole 13 and the second connecting hole 15 until the first clamping block 17 is clamped into the notch 16. Through this setting, have following beneficial effect:
First, since the edge of the lifting table 92 is attached to the guide bar 121, the lifting table 92 can support the guide bar 121 to prevent the guide bar 121 from being bent; in addition, the first clamping block 17 is clamped to the notch 16, so that the bonding area of the lifting platform 92 and the guide rod 121 can be increased, and the supporting effect of the lifting platform 92 on the guide rod 121 can be further improved.
Second, the first clamping block 17 is clamped in the notch 16, so that the lifting platform 92 can be locked, and the lifting platform 92 is prevented from autorotation.
Third, since the notch 16 and the first clamping block 17 are required to be aligned, the rotation angle of the lifting platform 92 can be precisely controlled by the alignment of the notch and the first clamping block, and the height of the lifting platform 92 can be precisely adjusted.
Fourth, the lifting platform 92 may fix the guide rod 121, specifically, the nut may apply a pulling force to one end of the guide rod 121, and the lifting platform 92 may apply a limit to the guide rod 121 through the first clamping block 17, so as to prevent the guide rod 121 from moving to the nut side, thereby preventing the nut from loosening.
Fifth, the first clamping block 17 can be fixed on the guide rod 121, and at this time, the first clamping block 17 is firm, and can also be connected to the guide rod 121 through threads, and at this time, the position of the first clamping block 17 can be adjusted, so that the first clamping block is suitable for lifting platforms 92 with different heights.
The first clamping block 17 is a truncated cone-shaped clamping block, and the notch 16 is attached to a side surface of the first clamping block 17.
Referring to fig. 2, a collar 18 is fixedly connected between the guide sleeves 122, for example, an outer ring surface of the collar 18 is welded to the guide sleeves 122. Collar 18 may connect the plurality 122 into a unitary structure, thereby improving the securement of guide sleeve 122.
Example 2
Unlike embodiment 1, referring to fig. 10, the guide sleeve 122 is provided with a through hole 19, the through hole 19 is located at one side of the collar 18, one side of the collar 18 is provided with an annular groove 20, the annular groove 20 is rotatably connected with a swivel 21, one side of the swivel 21 extends to the outside of the annular groove 20, and an outer ring of the swivel 21 is fixedly connected with a second clamping block 22; the guide rod 121 is provided with a plurality of clamping grooves 23, the second clamping block 22 can be clamped in the through hole 19 and the clamping grooves 23 by rotating the swivel 21, the sleeve ring is provided with a locking piece 24, and the locking piece 24 can lock the swivel 21 and the sleeve ring 18.
With this arrangement, if the hydraulic cylinder 11 is damaged, the second clamp block 22 can clamp the guide rod 121 and the guide sleeve 122, and the support frame can be prevented from being deformed due to the damage of the hydraulic cylinder 11, so that the safety of the support frame can be improved. Of course, the second clamping block 22 may not clamp the guide rod 121 and the guide sleeve 122.
It should be noted that the card slot 23 may be provided in two forms:
form one: the clamping grooves 23 are all positioned on the same side of the guide rod 121. In this case, when adjusting the position of the guide rod 121, it is necessary to orient the clamping grooves 23 to the position of the hydraulic cylinder 11 and align one of the clamping grooves 23 with the through-hole 19, and only in this case, the second clamping block 22 can be clamped into the clamping groove 23 through the through-hole 19. The advantage of this arrangement is that after the second clamping block 22 is clamped into the clamping groove 23, not only the guide rod 121 and the guide sleeve 122 can be locked, but also the guide rod 121 can be prevented from rotating.
Form two: the clamping groove 23 is annular and surrounds the surface of the guide rod 121. In this case, no matter what angle the guide rod 121 is rotated, as long as the locking groove 23 and the through hole 19 are aligned, the guide rod 121 and the guide sleeve 122 can be locked by the second locking block 22 being locked into the locking groove 23.
The internal force adjusting member 1 is composed of a plurality of components including a first fixing base 7, a second fixing base 8, a first mount 9, a second mount 10, a hydraulic cylinder 11, and a guide component 12. The components are combined together by a specific connection mode to form a mechanism capable of adjusting internal force. When a force needs to be applied to the rod-shaped element, the hydraulic cylinder 11 is driven to be stretched by the hydraulic system, so that the rod-shaped element is tensioned, and the stress of the corresponding position is improved. The guiding component 12 plays a limiting role, so that the internal force adjusting piece 1 can only move axially and cannot bend, the stability of the supporting frame is guaranteed, and the hydraulic cylinder 11 is prevented from being bent or damaged. The internal force adjuster 1 has adjustability, and the height thereof can be adjusted by rotating the elevating table 92, thereby increasing the limit length of the internal force adjuster 1. The design enables the rod-shaped parts with different lengths to be flexibly adapted under the condition that the foundation pit size is uncertain, and the problem of overlong or overlong is avoided. In addition, the arrangement of the bearing 94 and the support 96 enhances the axial load capacity of the bearing, improving the stability and durability of the overall mechanism.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The deep foundation pit inner supporting method based on the internal force adjustment is characterized by comprising the following steps of:
determining a foundation pit edge profile according to the position and the shape of a foundation pit, and arranging support piles at preset distances outside the foundation pit edge profile, wherein the support piles are embedded into preset depths below the ground;
setting a supporting structure according to the edge profile of the foundation pit, and constructing a supporting frame through the supporting structure;
in the process of building the support frame, a stress monitoring device and an internal force adjusting piece are embedded in the support frame, deformation and internal force change of the support frame are monitored in real time, and the internal force of the support frame is dynamically adjusted through the internal force adjusting piece;
The support frame includes:
The upper supporting structure (2) is transversely arranged, and two ends of the upper supporting structure (2) are fixedly connected to the supporting piles respectively;
the lower support structure (3) is transversely arranged, and two ends of the lower support structure (3) are fixedly connected with the support piles respectively;
the connecting structure (4), the upper end of the connecting structure (4) is fixedly connected with the upper supporting structure (2), and the lower end of the connecting structure (4) is fixedly connected with the lower supporting structure (3);
The tensioning structure (5), the tensioning structure (5) comprises a tensioning rod (51) and a tensioning steel rope (52), the tensioning rod (51) is connected to the upper side of the upper supporting structure (2), the tensioning steel rope (52) is connected to the upper end of the tensioning rod (51), and the end part of the tensioning steel rope (52) is connected to the upper end of the supporting pile;
The bearing structure (6) is obliquely arranged, the upper end of the bearing structure (6) is connected with the lower end of the lower supporting structure (3), and the lower end of the bearing structure (6) is rotatably connected with the supporting pile;
wherein, at least one of the upper supporting structure (2), the lower supporting structure (3), the connecting structure (4), the tensioning structure (5) and the bearing structure (6) is provided with an internal force adjusting piece (1);
The internal force adjuster (1) comprises: the device comprises a first fixing seat (7), a second fixing seat (8), a first mounting seat (9), a second mounting seat (10), a hydraulic cylinder (11) and a guide assembly (12);
the first fixing seat (7) is fixedly connected to the end part of one rod-shaped piece;
The second fixing seat (8) is fixedly connected to the end part of the other rod-shaped piece;
the first mounting seat (9) is detachably and fixedly connected to the first fixing seat (7);
the second mounting seat (10) is detachably and fixedly connected to the second fixing seat (8);
one end of the hydraulic cylinder (11) is connected to the first mounting seat (9), and the other end of the hydraulic cylinder (11) is connected to the second mounting seat (10);
The guide assemblies (12) are provided with a plurality of guide assemblies, one end of each guide assembly (12) is connected with the first mounting seat (9), and the other end of each guide assembly (12) is fixedly connected with the second mounting seat (10); and a plurality of guide assemblies (12) are arranged at equal intervals in a ring shape relative to the hydraulic cylinder (11).
2. The deep foundation pit inner supporting method based on inner force adjustment according to claim 1, wherein the method comprises the following steps:
the upper supporting structure (2) is formed by connecting a plurality of first rod-shaped pieces end to end;
The lower supporting structure (3) is formed by connecting a plurality of second rod-shaped pieces end to end;
The carrying structure (6) is constituted by one or several third rod-like elements;
The internal force adjusting piece (1) is arranged on the first rod-shaped piece, the second rod-shaped piece, the third rod-shaped piece and the tension rod (51); and/or
The internal force adjusting element (1) is arranged between two adjacent first rod-shaped elements and/or
The internal force adjusting element (1) is arranged between two adjacent second rod-shaped elements and/or
The internal force adjusting piece (1) is arranged between two adjacent third rod-shaped pieces.
3. The deep foundation pit inner supporting method based on inner force adjustment according to claim 1, wherein the method comprises the following steps:
a first connecting hole (13) is formed in the first fixing seat (7);
The first mounting seat (9) comprises a base (91) and a lifting table (92), and the lifting table (92) is rotationally connected to the base (91) through threads;
Fixed ring (93) is fixedly connected with on elevating platform (92), fixed ring (93) inside fixedly connected with bearing (94), the inner circle fixedly connected with carrier block (95) of bearing (94), fixedly connected with support piece (96) on elevating platform (92), the one end laminating of carrier block (95) in support piece (96), the other end fixedly connected with of carrier block (95) in the tip of pneumatic cylinder (11).
4. The deep foundation pit inner supporting method based on internal force adjustment according to claim 3, wherein the method comprises the following steps:
The guide assembly (12) comprises a guide rod (121) and a guide sleeve (122), one end of the guide rod (121) is connected to the base (91) through threads, the guide rod (121) is aligned with the first connecting hole (13), one end of the guide sleeve (122) is fixedly connected to the second mounting seat (10), and the guide rod (121) is slidably inserted into the guide sleeve (122).
5. The deep foundation pit inner supporting method based on inner force adjustment according to claim 4, wherein the method comprises the following steps:
The novel fixing device is characterized in that an L-shaped buckle (14) is fixedly connected to the upper end of the first mounting seat (9), the L-shaped buckle (14) can be clamped to the first fixing seat (7), a second connecting hole (15) is formed in the L-shaped buckle (14), and the second connecting hole (15) can be aligned with the first connecting hole (13).
6. The deep foundation pit inner supporting method based on inner force adjustment according to claim 5, wherein the method comprises the following steps:
The edge of the lifting table (92) is attached to the guide rod (121);
The edge of the lifting platform (92) is provided with a plurality of notches (16) at equal intervals in an annular shape;
The guide rod (121) is fixedly or in threaded connection with a first clamping block (17), and the first clamping block (17) can be clamped in the notch (16).
7. The deep foundation pit inner supporting method based on inner force adjustment according to claim 6, wherein the method comprises the following steps:
A lantern ring (18) is fixedly connected between the guide sleeves (122).
8. The deep foundation pit inner supporting method based on inner force adjustment according to claim 7, wherein the method comprises the following steps:
The guide sleeve (122) is provided with a through hole (19), the through hole (19) is positioned at one side of the lantern ring (18), one side of the lantern ring (18) is provided with an annular groove (20), the annular groove (20) is rotationally connected with a swivel (21), one side of the swivel (21) extends to the outer side of the annular groove (20), and the outer ring of the swivel (21) is fixedly connected with a second clamping block (22);
a plurality of clamping grooves (23) are formed in the guide rod (121), the second clamping blocks (22) can be clamped in the through holes (19) and the clamping grooves (23) by rotating the rotating ring (21), locking pieces (24) are arranged on the lantern ring, and the locking pieces (24) can lock the rotating ring (21) and the lantern ring (18).
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| CN202410612295.1A CN118187098B (en) | 2024-05-17 | 2024-05-17 | Deep foundation pit inner supporting method based on inner force adjustment |
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| CN202410612295.1A CN118187098B (en) | 2024-05-17 | 2024-05-17 | Deep foundation pit inner supporting method based on inner force adjustment |
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| KR100711711B1 (en) * | 2006-09-05 | 2007-04-25 | (주)써포텍 | Light single wale by using pre-stressed support method |
| KR200432105Y1 (en) * | 2006-09-11 | 2006-11-29 | 주식회사 동호 | temporary prestress system for transmit prestress to land side protection wall |
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| CN118187098B (en) | 2024-07-09 |
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