A deep foundation pit bracing structure and a bracing method
By using capping beams, waist beams, and auxiliary devices within the deep foundation pit, the problems of high construction difficulty and smooth drainage were solved, thereby improving the efficiency of support replacement construction and building quality.
Patent Information
- Application Number
- CN202610854640.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2026-06-13
- Publication Date
- 2026-07-21
AI Technical Summary
The replacement of existing deep foundation pit internal supports is difficult and can easily affect the smooth drainage of the deep foundation pit, thus affecting the quality of building construction.
The system employs a crown beam, waist beam, and auxiliary devices, including a frame, auxiliary components, and adjustment components. The auxiliary components cover the drainage ditch to prevent impurities from entering, assist in the construction of the waist beam, and ensure smooth drainage through filter plates and drainage holes.
It improved the construction efficiency and effectiveness of the wainscoting, reduced the probability of impurities entering the drainage ditch, and ensured the quality of building construction and smooth drainage.
Smart Images
Figure CN122428657A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of deep foundation pit construction, and in particular to a deep foundation pit support replacement structure and support replacement method. Background Technology
[0002] With the rapid development of the construction industry, complex deep foundation pit projects are becoming increasingly common. Among various deep foundation pit support structures, the combination of retaining piles and internal bracing has been widely used. After the foundation pit excavation and support are completed, the horizontal internal bracing in the support system often affects the subsequent construction of the main structure. Therefore, during the main structure construction phase, it is necessary to remove those internal bracings that conflict with the location of the main structure. To ensure the safety of the foundation pit during the removal process, appropriate replacement bracing measures must be taken before removing the internal bracing to effectively transfer the load generated by the removal of the bracing to the basement main structure.
[0003] Currently, there are two main types of common deep foundation pit internal support replacement schemes: one is to transfer the soil pressure on the foundation pit sidewall to the main structure by casting reinforced concrete beams or slabs in place at the location of the retaining piles and the basement exterior wall slab; the other is to pre-embed connectors or install post-installed embedded parts on the basement exterior wall and retaining piles, and set up precast reinforced concrete inclined steel beams between the two to form a force transmission path, or use steel inclined bracing to directly transfer the stress borne by the retaining structure to the main structure.
[0004] Therefore, in the existing process of replacing supports within deep foundation pits, it is generally necessary to form a force-transfer structure between the retaining piles and the completed main building structure. However, it is difficult to construct a force-transfer structure by casting formwork in the space between the completed main building structure and the retaining piles. Furthermore, the construction process can easily affect the drainage of the drainage ditch located at the bottom of the deep foundation pit (because the construction site is located above the drainage ditch), which can affect the subsequent drainage of water inside the deep foundation pit, thereby affecting the quality of building construction. Summary of the Invention
[0005] This application provides a deep foundation pit support replacement structure and method, which can effectively improve the efficiency and effect of support replacement construction, and at the same time effectively reduce the impact of support replacement construction on the smooth drainage of deep foundation pits, thereby effectively ensuring the quality of building construction.
[0006] On the one hand, this application provides a deep foundation pit support replacement structure, which adopts the following technical solution: A deep foundation pit support structure includes a cap beam, several waist beams, and auxiliary devices; The capping beam is constructed on top of the retaining piles, and the waist beam is constructed on the side of the retaining piles near the deep foundation pit. Both the capping beam and the waist beam are connected to the main building structure, and several waist beams are distributed vertically at intervals on the retaining piles. The waist beam includes several reinforcing bars. One end of the reinforcing bar is inserted into the retaining pile, and the other end is close to the main building structure. The auxiliary device includes a frame, auxiliary components, and an adjustment component; the frame is installed on top of the retaining piles and is located inside the capping beam after construction; the auxiliary components are horizontally installed and are located in the deep foundation pit and close to the bottom of the deep foundation pit; the adjustment component is installed on the frame and is used to control the movement of the auxiliary components in the vertical direction. When the auxiliary component moves downward to its limit position, it covers the drainage ditch; when the auxiliary component moves upward toward the reinforcing steel bar located at the bottom, it assists in the construction of the waist beam located at the bottom.
[0007] By adopting the above technical solution, the auxiliary device can effectively prevent impurities from entering the drainage ditch above the bottom wainscoting before the construction of the bottom wainscoting begins, thus ensuring smooth drainage of water inside the deep foundation pit. When the construction of the bottom wainscoting begins, construction personnel can select the construction position of the wainscoting based on the auxiliary components as the bottom foundation, thereby improving the efficiency and effectiveness of the wainscoting construction. At the same time, it can effectively reduce the probability of impurities falling into the drainage ditch and affecting the smooth drainage during the construction of the wainscoting, effectively improving the efficiency and effectiveness of the support replacement construction while effectively ensuring the quality of the building construction.
[0008] Optionally, the auxiliary component includes a plurality of filter plates for supplying water through and for intercepting concrete.
[0009] By adopting the above technical solution, rainwater or accumulated water can easily pass through the auxiliary components and be discharged through the drainage ditch. At the same time, it can effectively intercept impurities that enter the drainage ditch along with rainwater or accumulated water. Furthermore, it can facilitate the casting and shaping of the bottom waist beam, further improving the effectiveness of reducing the probability of impurities (such as concrete) falling into the drainage ditch during waist beam construction.
[0010] Optionally, the auxiliary component includes two filter plates and also includes a connecting plate; The adjustment component is directly connected to the connecting plate. The length direction of the connecting plate is parallel to the inner wall of the adjacent deep foundation pit, and the two filter plates are respectively arranged on both sides of the connecting plate. The filter plate is rotatably connected to the connecting plate, and its rotation axis is parallel to the length direction of the connecting plate. When the filter plate rotates downward to its limit position, it is inclined downward relative to the connecting plate.
[0011] By adopting the above technical solution, the auxiliary components can be moved while maintaining a distance from the completed main building structure and retaining piles. This facilitates the upward adjustment of the auxiliary components after they leave the opening of the drainage ditch. At the same time, during the upward movement, the impurities intercepted by the filter plate can be driven away and fall to both sides above the drainage ditch. This makes it easier for the auxiliary components to be used to assist in the construction of the waist beam while reducing the probability of impurities falling into the drainage ditch and affecting the smooth drainage.
[0012] Optionally, the auxiliary component may further include a movable part; The movable component is movably connected to the connecting plate, its direction of movement is vertical, and it moves with the rotation of the filter plate. When the auxiliary component covers the drainage ditch, the filter plate rotates upward to its limit position, and the movable part moves downward to its limit position; after the auxiliary component moves upward, the filter plate rotates downward to its limit position, and the movable part moves upward to its limit position; as the auxiliary component moves upward toward the reinforcing steel bar located at the bottom, the movable part is forced to move downward to its limit position.
[0013] By adopting the above technical solution, the auxiliary components can easily maintain the filter plate in a horizontal position during the construction of the auxiliary wainscoting, thereby further improving the construction efficiency and effect of the wainscoting.
[0014] Optionally, the adjustment assembly includes a plurality of connecting rods and a plurality of positioning elements that correspond one-to-one; The connecting rod is movably connected to the frame in the vertical direction, and its bottom is detachably connected to the connecting plate; the positioning member is movably connected to the frame in the horizontal direction, and when the positioning member contacts the connecting rod, it restricts the movement of the connecting rod in the vertical direction.
[0015] By adopting the above technical solution, construction personnel can easily adjust the height of the auxiliary components, and also easily position them after the height adjustment is completed.
[0016] Optionally, the auxiliary component further includes a plurality of extensions corresponding one-to-one with the plurality of connecting rods, the extensions being vertically disposed on the top of the connecting plate, and the extensions having drainage holes inside; When the construction of the bottom waist beam is completed and the connecting rod is disconnected from the connecting plate, the space above the waist beam and the space below it are connected through a number of drainage holes, and the drainage holes are aligned with the drainage ditch in the vertical direction.
[0017] By adopting the above technical solution, after the construction of the bottom wainscoting is completed, rainwater entering the deep foundation pit will fall onto the wainscoting and be discharged into the drainage ditch through the drainage holes. This will effectively ensure the timely drainage effect of the drainage ditch on the deep foundation pit and reduce the probability that long-term water accumulation on the wainscoting will affect the stability of the replacement support structure.
[0018] Optionally, the connecting rod is threaded into the extension.
[0019] By adopting the above technical solution, construction personnel can easily realize and disconnect the connection between the adjustment component and the auxiliary component.
[0020] Optionally, the end of the positioning member near the connecting rod is used to engage with a groove formed between adjacent threads on the outer side of the connecting rod.
[0021] By adopting the above technical solution, the positioning component can easily achieve the positioning effect on the connecting rod, and at the same time, it can effectively improve the positioning accuracy of the positioning component on the connecting rod, thereby meeting the higher precision requirements of the wainscoting construction position.
[0022] Optionally, the extension is rotatably connected to the connecting plate, and when the positioning member restricts the connecting rod from moving in the vertical direction, the connecting rod is free to rotate relative to the positioning member.
[0023] By adopting the above technical solution, construction workers can easily make fine adjustments to the height of the auxiliary components when positioning the connecting rod with the positioning component. At the same time, construction workers can easily disconnect the connection between the adjustment component and the auxiliary component after the construction of the bottom waist beam is completed.
[0024] On the other hand, this application also provides a method for replacing supports, which adopts the following technical solution: A method for replacing the support, based on the aforementioned deep foundation pit support structure, wherein the auxiliary device is installed before the support replacement is performed, and the auxiliary device covers the drainage ditch, includes the following steps: S1. After the main building structure located at the bottom of the deep foundation pit is completed, the auxiliary component is moved upward and then the auxiliary component is used as the bottom mold to support the bottom waist beam at the position of the retaining pile near the bottom. S2. After the construction of the waist beam at the bottom is completed, remove the corresponding internal support structure and the adjustment component; S3. After continuing the construction of the main building structure to a certain height, construct the other waist beam by setting up the formwork, and then remove the corresponding internal support structure. S4. Repeat steps S3 until the construction of the main building structure in the deep foundation pit is completed; S5. Construct the cap beam on the top of the retaining piles based on the frame, so that the main building structure and the top of the retaining piles can form a force transmission connection through the cap beam, and then remove the corresponding internal support structure.
[0025] In summary, this application includes at least one of the following beneficial effects: 1. It can effectively improve the construction efficiency and effect of the cap beam and the bottom waist beam, thereby effectively improving the efficiency and effect of the support replacement construction; 2. It can effectively reduce the probability of impurities entering the drainage ditch, thereby effectively reducing the impact of the replacement support construction on the smooth drainage of the deep foundation pit, and thus effectively ensuring the quality of building construction; 3. It enables construction personnel to more accurately locate the construction position of the bottom wainscoting according to the actual construction situation, thereby improving the strength and reliability of the initial structure of the replacement support structure, and thus improving the strength and reliability of the subsequent replacement support structure. Attached Figure Description
[0026] Figure 1 This is a partial sectional view of a deep foundation pit support replacement structure in Embodiment 1 when the support replacement is completed; Figure 2 This is a partial cross-sectional view of a deep foundation pit support replacement structure in Example 1 before support replacement was performed; Figure 3 This is a partial structural diagram of a deep foundation pit replacement structure in Example 1 when the replacement support has not been performed; Figure 4 This is a partial cross-sectional view of a deep foundation pit support replacement structure in Example 1, at the beginning of the support replacement process; Figure 5 This is a partial sectional view of the deep foundation pit replacement support structure in Example 1, showing the construction of the bottom wainscoting. Figure 6 This is a partial sectional view of the construction of another lumbar beam after the completion of the bottom lumbar beam in the deep foundation pit replacement support structure construction in Example 1. Figure 7 This is a partial structural diagram of a deep foundation pit support replacement structure in Example 2 when the support replacement has not been performed; Figure 8 This is a partial structural diagram of a deep foundation pit replacement support structure during the construction of the bottom wainscoting in Example 2; Figure 9 This is a partial structural diagram of the completed waist beam at the bottom of a deep foundation pit replacement support structure in Example 2.
[0027] Explanation of reference numerals in the attached drawings: 1. Foundation; 11. Deep foundation pit; 12. Drainage ditch; 2. Main building structure; 3. Retaining piles; 4. Crown beam; 5. Waist beam; 51. Reinforcing steel bars; 6. Auxiliary device; 61. Frame; 62. Auxiliary component; 621. Connecting plate; 622. Filter plate; 623. Movable part; 624. Extension part; 625. Drainage hole; 63. Adjustment component; 631. Connecting rod; 632. Positioning part. Detailed Implementation
[0028] The following is in conjunction with the appendix Figure 1-9 This application will be described in further detail. Example 1
[0029] This application discloses a deep foundation pit support replacement structure. Based on the construction of retaining piles around the perimeter of the deep foundation pit before excavation, this structure replaces the original internal support structure (which would be inconvenient to subsequent construction and would need to be removed) during the gradual construction of the main building structure within the deep foundation pit. This allows the forces exerted on the retaining piles around the deep foundation pit to directly act on the completed main building structure. In this embodiment, since both the retaining piles and the corresponding internal support structure are existing technologies in the art, they will not be described in detail here. The accompanying drawings only briefly represent the retaining piles and omit the description of the internal support structure.
[0030] Reference Figure 1 and Figure 2 The deep foundation pit support structure includes a capping beam 4, several waist beams 5, and auxiliary devices 6. In this embodiment, the deep foundation pit support structure preferably includes two waist beams 5. In other embodiments, the number of waist beams 5 can be increased or decreased according to the actual situation. Preferably, after the support is replaced, the retaining piles 3 will directly transmit force to the completed main building structure 2 through the capping beam 4 and the waist beams 5. In practical applications, in order to ensure the effect of the retaining piles 3 in improving the structural stability of the deep foundation pit 11, multiple anchor rods can also be constructed that pass through the retaining piles 3 and the waist beams 5 / capping beams 4. Since this technical solution is the prior art in this field, it will not be described in detail here, and the anchor rods are omitted in the accompanying drawings.
[0031] Because the bottom of the deep foundation pit 11 is prone to water accumulation due to rain or groundwater seepage during construction, and this water accumulation will affect the construction quality of the subsequent main building structure 2 in the deep foundation pit 11, a drainage ditch 12 is provided at the bottom of the deep foundation pit 11 near the edge to drain the accumulated water. The area enclosed by the drainage ditch 12 in the deep foundation pit 11 is used for the construction of the main building structure 2. In this embodiment, since the drainage ditch 12 with the above-mentioned functions is prior art in this field, it will not be described in detail here, and it is only briefly shown in the accompanying drawings.
[0032] After construction, the cap beam 4 takes the form of a strip structure. It is constructed on top of the retaining piles 3, and its length direction is consistent with the arrangement direction of the multiple adjacent retaining piles 3. One end of the cap beam 4 is fixedly connected to the multiple adjacent retaining piles 3, and its other end extends horizontally and forms a fixed connection with the completed main building structure 2. This allows the retaining piles 3 to transfer the force they receive to the main building structure 2, ensuring the retaining piles 3's protective effect on the deep foundation pit 11 after the support replacement.
[0033] After construction, the waist beam 5 also takes the form of a strip structure. It is constructed between the retaining piles 3 and the completed main building structure 2, and its length direction is consistent with the arrangement direction of the adjacent retaining piles 3. One end of the waist beam 5 is fixedly connected to the adjacent retaining piles 3, and its other end extends horizontally and forms a fixed connection with the completed main building structure 2. This also enables the retaining piles 3 to transfer the force they receive to the main building structure 2, ensuring the retaining piles 3's protective effect on the deep foundation pit 11 after the support replacement.
[0034] In practical applications, the two lumbar beams 5 and the cap beam 4 will be constructed sequentially from bottom to top as the main building structure 2 is constructed in the deep foundation pit 11. This will gradually replace the original internal support structure inside the deep foundation pit 11 that provides support, ensuring that the deep foundation pit 11 has sufficient structural stability during the construction of the main building structure 2, while also avoiding any obstruction to the construction of the main building structure 2 by the internal support structure.
[0035] Reference Figure 3 and Figure 4 The auxiliary device 6 includes a frame 61, an auxiliary component 62, and an adjustment component 63.
[0036] The frame 61 is fixedly installed on the top of the retaining piles 3. After the construction of the main building structure 2 in the deep foundation pit 11 is completed, the end of the frame 61 away from the retaining piles 3 will be close to the completed main building structure 2. Then, the crown beam 4 will be constructed based on the frame 61, so that the frame 61 is finally located inside the cast crown beam 4, thereby improving the overall structural strength of the crown beam 4.
[0037] When the capping beam 4 is not under construction, the frame 61 is used for the installation of the adjustment component 63, and the adjustment component 63 is used for construction personnel to control the height position of the auxiliary component 62 in the deep foundation pit 11; the auxiliary component 62 is installed in the deep foundation pit 11 near the bottom and near the adjacent retaining pile 3, and it is located above the adjacent drainage ditch 12; the adjustment component 63 is used to control the movement of the auxiliary component 62 in the vertical direction, and the auxiliary component 62 has different auxiliary effects at different height positions.
[0038] The auxiliary component 62 includes a connecting plate 621, two filter plates 622, a movable part 623, and several extension parts 624.
[0039] The connecting plate 621 has a rectangular plate structure and is installed in a position that is horizontal in the length direction and parallel to the arrangement direction of the adjacent retaining piles 3.
[0040] The filter plate 622 has a rectangular plate-like structure. One end of its width direction is rotatably connected to one end of the connecting plate 621 in the width direction, and its axis of rotation is parallel to both its own length direction and the length direction of the connecting plate 621. Two filter plates 622 are respectively installed on both sides of the connecting plate 621 in the width direction, and the two filter plates 622 are symmetrically distributed on both sides of the connecting plate 621. The filter plate 622 has a plurality of mesh holes evenly distributed on it for water to pass through and for intercepting impurities and concrete. In this embodiment, since the filter plate 622 with the above functions is common prior art, it will not be described in detail here, and it is only briefly shown in the accompanying drawings.
[0041] The filter plate 622 is restricted in its rotation relative to the connecting plate 621, and rotates relative to the connecting plate 621 under its own gravity. When the filter plate 622 rotates downward to its limit position, its width direction is inclined downward away from the connecting plate 621; when the filter plate 622 rotates upward to its limit position, its width direction is parallel to the width direction of the connecting plate 621, and the top and bottom surfaces of both filter plates 622 and the connecting plate 621 are flush. In this embodiment, it is preferable that when both filter plates 622 rotate upward to their limit positions, the width dimension of the auxiliary component 62 is adapted to the spacing dimension between the main building structure and the retaining piles 3 during subsequent construction.
[0042] The movable component 623 is movably mounted on the connecting plate 621. Its direction of movement is parallel to the direction of movement adjustment of the auxiliary component 62, and it can move in and out of the space above the connecting plate 621 during its movement relative to the connecting plate 621. One end of the movable component 623 located inside the connecting plate 621 has a structure for synchronously controlling the rotation of the two filter plates 622 relative to the connecting plate 621, and the rotation of the filter plates 622 can also control the movement of the movable component 623 relative to the connecting plate 621.
[0043] Reference Figure 4 and Figure 5The movable member 623 has limitations during its movement relative to the connecting plate 621. When the movable member 623 moves upward to its limit position, the top of the movable member 623 extends out of the connecting plate 621. At this time, the movable member 623 allows the filter plate 622 to rotate downward to its limit position relative to the connecting plate 621, and the end of the filter plate 622 contacts and abuts against the structure of the movable member 623 located inside the connecting plate 621. When the movable member 623 moves downward to its limit position, the movable member 623 will be entirely located inside the connecting plate 621. At this time, the movable member 623 will restrict the filter plate 622 from rotating upward to its limit position relative to the connecting plate 621, and the end of the filter plate 622 will also contact and abut against the structure of the movable member 623 located inside the connecting plate 621.
[0044] Reference Figure 3 and Figure 5 The extension member 624 has a cylindrical structure and is rotatably mounted above the connecting plate 621 with its axis of rotation coinciding with its own axis. A drainage hole 625 for drainage is formed both inside the extension member 624 and on the connecting plate 621. The drainage hole 625 is cylindrical in shape, and its axis coincides with the axis of the extension member 624. In this embodiment, the extension member 624 is preferably centered on the connecting plate 621 along its width direction, and the drainage hole 625 remains vertically aligned with the drainage ditch 12 below as the connecting plate 621 moves up and down in the deep pit 11. Preferably, the auxiliary component 62 includes two extension members 624, which are symmetrically distributed on the connecting plate 621 along its length direction, and are located near both ends of the connecting plate 621 along its length.
[0045] Reference Figure 3 and Figure 6 The adjusting assembly 63 is detachably connected to the frame 61 at a position away from the retaining pile 3. It includes several connecting rods 631 for construction personnel to control the vertical adjustment of the auxiliary assembly 62's height, and several positioning elements 632 for positioning the connecting rods 631 to fix the height of the auxiliary assembly 62. In this embodiment, preferably, the connecting rods 631 correspond one-to-one with the extensions 624, and the positioning elements 632 also correspond one-to-one with the connecting rods 631. Therefore, the adjusting assembly 63 preferably includes two connecting rods 631 and two positioning elements 632.
[0046] The connecting rod 631 has a cylindrical structure and is vertically mounted on the frame 61, with its direction of movement parallel to its axis. The connecting rod 631 is threadedly engaged with the corresponding extension 624 as it passes through it, and the outer surface of the connecting rod 631 has an external thread structure.
[0047] The positioning element 632 is movably mounted on the top of the frame 61. Its direction of movement is perpendicular to the axis of the connecting rod 631. When it moves to its limit position towards the corresponding connecting rod 631, the end of the positioning element 632 will engage in the groove formed by the external thread structure on the outer side of the corresponding connecting rod 631, thus restricting the movement of the corresponding connecting rod 631 along its own axis and allowing the corresponding connecting rod 631 to maintain its current position relative to the frame 61. When the positioning element 632 moves to its limit position away from the corresponding connecting rod 631, the corresponding connecting rod 631 can move freely relative to the frame 61. In this embodiment, it is preferable that the direction of movement of the positioning element 632 is parallel to the width direction of the frame 61. Preferably, when the positioning element 632 restricts the movement of the corresponding connecting rod 631 along its automatic axis, the connecting rod 631 can be slowly adjusted in position along its own axis by means of the corresponding extension 624 that is threadedly engaged with it.
[0048] In this embodiment, the auxiliary device 6 is preferably installed before the main building structure 2 is constructed in the deep foundation pit 11, and the adjustment component 63 is preferably removed before the cap beam 4 is constructed, and the cap beam 4 is constructed by formwork and pouring based on the frame 61.
[0049] Reference Figure 1 and Figure 6 The waist beam 5 includes several reinforcing steel bars 51 for improving its structural strength. When the waist beam 5 needs to be constructed, one end of several reinforcing steel bars 51 is first inserted into the interior of several retaining piles 3, so that several reinforcing steel bars 51 are evenly distributed along the arrangement direction of several retaining piles 3. Then, based on several reinforcing steel bars 51, formwork is erected and the waist beam 5 is finally formed.
[0050] Reference Figure 4 and Figure 5During the construction of the bottom wainscoting 5, the auxiliary component 62 is moved upward to its limit position (at this time, the movable part 623 will move downward to its limit position relative to the connecting plate 621 under the limitation of several reinforcing bars 51, so that both filter plates 622 are kept in the state of rotating upward to their limit position). At this time, the auxiliary component 62 can play the role of assisting the bottom formwork below the several reinforcing bars 51 (and the auxiliary component 62 can meet the construction needs of different height positions of the bottom wainscoting 5), and the top of the extension 624 will be above the several reinforcing bars 51. During the subsequent formwork construction, the top of the extension 624 needs to be left open. In this embodiment, it is preferable that after the bottom wainscoting 5 is constructed, the top surface of the extension 624 is flush with the top surface of the bottom wainscoting 5; at this time, impurities entering the deep foundation pit 11 will stay above the bottom wainscoting 5, and the accumulated water can flow into the drainage ditch 12 below through the drainage hole 625.
[0051] The implementation principle of a deep foundation pit replacement support structure in this application embodiment is as follows: Before the main building structure 2 is constructed in the deep foundation pit 11, after the auxiliary device 6 is installed, the auxiliary component 62 is in the state of moving downward to the limit position. At this time, the auxiliary component 62 is in contact with the bottom wall of the deep foundation pit 11, both filter plates 622 are in the state of rotating upward to the limit position and the moving part 623 is in the state of moving downward to the limit position. The auxiliary component 62 covers the opening at the top of the drainage ditch 12, so that the water at the bottom of the deep foundation pit 11 will enter the drainage ditch 12 after being filtered by the filter plate 622, while impurities will stay above the auxiliary component 62, so as to effectively ensure the smooth drainage of the drainage ditch 12. As the main structure 2 of the building is gradually constructed, when the bottom wainscoting 5 needs to be replaced, multiple reinforcing steel bars 51 are first installed on multiple retaining piles 3. Then, the auxiliary component 62 is controlled to move upward to its limit position by adjusting component 63. During the upward movement of the auxiliary component 62, impurities located above the auxiliary component 62 can fall down along the downward inclined filter plate 622 to both sides of the drainage ditch 12. When the auxiliary component 62 moves upward to its limit position, it can assist the construction personnel in setting up formwork based on several reinforcing steel bars 51, and then the bottom wainscoting 5 is poured and formed. After the bottom waist beam 5 is completed, the adjustment component 63 is removed so that the drainage hole 625 on the bottom waist beam 5, which is used to guide the accumulated water into the drainage ditch 12, can play its role. At the same time, the bottom waist beam 5 can effectively reduce the probability of impurities falling into the drainage ditch 12 and affecting the smooth drainage during the construction of another waist beam 5. As the main structure 2 of the building is gradually constructed, when the second wainscoting 5 needs to be replaced, the above steps are repeated to install several reinforcing steel bars 51. Based on the formwork of the several reinforcing steel bars 51, the second wainscoting 5 is then cast. When the subsequent construction of the main building in the deep foundation pit 11 is completed, the cap beam 4 needs to be replaced. After the formwork is erected on the top of multiple retaining piles 3 based on the frame 61, the cap beam 4 can be poured and formed, thus completing all the replacement operations. Example 2
[0052] Reference Figure 7 and Figure 8 The difference between this embodiment and embodiment 1 is that the auxiliary component 62 is used, and the waist beam 5 is a cuboid structure after construction. Multiple waist beams 5 are constructed at the same height. Multiple auxiliary components 62 correspond one-to-one with multiple waist beams 5, and multiple waist beams 5 are distributed at equal intervals along their own length direction.
[0053] The auxiliary component 62 includes three filter plates 622. One filter plate 622 is detachably connected to the bottom of the connecting rod 631 in a horizontal position. The other two filter plates 622 are respectively installed on both sides of the filter plate 622 along its length. Both filter plates 622 are rotatably connected to the filter plate 622, and their rotation axes are parallel to the width direction of the filter plate 622. In this embodiment, it is preferable that the filter plates 622 and the connecting rod 631 are detachably connected through a threaded engagement; and preferably, the two filter plates 622 located on both sides have the same shape.
[0054] Under their own gravity, the two filter plates 622 rotate relative to the filter plate 622 detachably connected to the connecting rod 631, and their rotation is restricted; when the filter plate 622 rotates downward to its limit position, it is also in a horizontal position, and its top and bottom surfaces are flush with the adjacent filter plate 622; when the filter plate 622 rotates upward to its limit position, it is in a vertical position, and at this time the three filter plates 622 will enclose a space for the waist beam 5 to be cast.
[0055] The two filter plates 622 located on both sides of the filter plate 622 detachably connected to the connecting rod 631 can maintain a horizontal position under their own gravity. Two triggers are installed on the filter plate 622 detachably connected to the connecting rod 631 to drive the two filter plates 622 to rotate upward to the limit position against their gravity. The two triggers are respectively close to the two ends of the filter plate 622 in the length direction. They are movably connected along the thickness direction of the filter plate 622. One end of the trigger in the length direction can enter and exit the space above the filter plate 622, and the other end of the trigger in the length direction can contact and abut against the adjacent filter plate 622 controlled by it.
[0056] When the connecting rod 631 moves downward relative to the frame 61, causing the filter plate 622 detachably connected to it to contact the bottom wall of the deep pit 11, all three filter plates 622 in the horizontal position will cover the top opening of the drainage ditch 12. At this time, both triggers are in the state of moving upward to the limit position. When multiple auxiliary components 62 are in the current state, the adjacent filter plates 622 of different auxiliary components 62 will contact each other and work together to form a filter structure that completely covers the drainage ditch 12, reducing the probability of the drainage ditch 12 being blocked.
[0057] Reference Figure 8 and Figure 9 When all the reinforcing bars 51 at the bottom are installed, as the connecting rod 631 moves upward relative to the frame 61 to its limit position, the filter plate 622, which is detachably connected to the connecting rod 631, will be located at the bottom of the corresponding reinforcing bar 51 and in contact with its bottom. At this time, after the triggering element contacts the reinforcing bar 51, it will move downward to its limit position, thereby driving the two filter plates 622 to rotate upward to their limit positions, so that the two filter plates 622 are located on both sides of the corresponding reinforcing bar 51, which facilitates the subsequent construction personnel to set up formwork around the reinforcing bar 51 and pour the wainscoting 5. In this embodiment, since the triggering element with the above function is common prior art, it will not be described in detail here, and its representation is omitted in the accompanying drawings.
[0058] The implementation principle of a deep foundation pit replacement support structure in this application embodiment is as follows: Before the main building structure 2 is constructed in the deep foundation pit 11, after the auxiliary device 6 is installed, multiple auxiliary components 62 are controlled to move downward to their limit position. At this time, the three filter plates in the auxiliary components 62 are in contact with the bottom wall of the deep foundation pit 11, and the three filter plates 622 cover the opening at the top of the drainage ditch 12, so that the water at the bottom of the deep foundation pit 11 will enter the drainage ditch 12 after being filtered by the filter plates 622, so as to effectively ensure the smooth drainage of the drainage ditch 12. As the main structure 2 of the building is gradually constructed to the point where the multiple wainscoting beams 5 at the bottom need to be replaced, multiple reinforcing steel bars 51 are first installed on multiple retaining piles 3. Then, multiple auxiliary components 62 are controlled to move upward to their limit positions through multiple adjustment components 63. When the auxiliary components 62 move upward to their limit positions, three filter plates 622 will surround the corresponding reinforcing steel bars 51 and form a space for the corresponding wainscoting beams 5 to be cast. After that, the three filter plates 622 are connected to the reinforcing steel bars 51, and the adjustment components 63 are removed. Then, the construction workers can continue to complete the formwork work on this basis and then cast the multiple wainscoting beams 5 at the bottom. As the main structure 2 of the building is gradually constructed, when the multiple wain beams 5 of the second floor need to be replaced, the above steps are repeated to install multiple reinforcing steel bars 51. Then, formwork is erected based on the multiple reinforcing steel bars 51, and the multiple wain beams 5 of the second floor are poured and formed. When the subsequent construction of the main building in the deep foundation pit 11 is completed, the cap beam 4 needs to be replaced. After the formwork is erected on the top of multiple retaining piles 3 based on the frame 61, the cap beam 4 can be poured and formed, thus completing all the replacement operations. Example 3
[0059] Reference Figure 1-6 This application discloses a method for replacing supports, based on a deep foundation pit support replacement structure as disclosed in Embodiment 1. Before carrying out the support replacement work, it is necessary to first install the auxiliary device 6 in place based on the retaining piles 3 and ensure that the auxiliary component 62 covers the drainage ditch 12.
[0060] The support replacement method includes the following steps: S1. After the main building structure 2 located at the bottom of the deep foundation pit 11 is completed, the auxiliary component 62 is moved upward and then the auxiliary component 62 is used as the bottom mold to support the bottom waist beam 5 at the position of the retaining pile 3 near the bottom.
[0061] After the main building structure 2, located at the bottom of the deep foundation pit 11, is completed, construction begins on the lowest lintel 5.
[0062] First, operate the adjustment component 63 to control the auxiliary component 62 to move upward a certain distance, so that it moves away from the opening of the drainage ditch 12.
[0063] Then, using the upward-moving auxiliary component 62 as the bottom support mold or operating platform, formwork is erected near the bottom of the retaining pile 3, and concrete is poured to construct the bottom waist beam 5.
[0064] S2. After the construction of the bottom waist beam 5 is completed, the corresponding internal support structure is removed, and the adjustment component 63 is also removed.
[0065] Once the bottom lumbar beam 5 is completed and reaches its design strength, the corresponding internal support structure that conflicts with its position will be removed.
[0066] At the same time, the adjustment component 63 (including the connecting rod 631 and the positioning component 632) is removed from the frame 61 and the auxiliary component 62.
[0067] S3. After the main building structure 2 has been constructed to a certain height, formwork is erected for the construction of another lumbar beam 5, and then the corresponding internal support structure is removed.
[0068] Continue constructing the main building structure 2 upwards. When the main building structure 2 is constructed to a certain height (e.g., the position of the next floor slab or floor), formwork is erected again to construct another wainscoting 5.
[0069] After the construction of the 5th lumbar beam is completed, its corresponding internal support structure will be removed.
[0070] S4. Repeat steps S3 until the construction of the main building structure 2 in the deep foundation pit 11 is completed.
[0071] Repeat step S3 above, and construct the remaining waist beams 5 in order from bottom to top, and remove the corresponding internal support structures one by one, until all construction tasks of the main building structure 2 in the deep foundation pit 11 are completed.
[0072] S5. Construct a cap beam 4 on the top of the retaining piles 3 based on the frame 61. The cap beam 4 enables the main building structure 2 to form a force transmission connection with the top of the retaining piles 3. Then, remove the corresponding internal support structure.
[0073] Construction of the capping beam 4 is carried out on top of the retaining pile 3.
[0074] During construction, the frame 61 of the auxiliary device 6 is directly poured into the inside of the cap beam 4.
[0075] The main building structure 2 and the top of the retaining piles 3 are firmly connected by the capping beam 4, forming the final and topmost force transmission path.
[0076] Once the strength of the cap beam 4 reaches the required level, the last corresponding internal support structure is removed, thus completing the entire support replacement operation for the deep foundation pit 11.
[0077] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A deep foundation pit support replacement structure, based on retaining piles (3), characterized in that, It includes a crown beam (4), several waist beams (5) and auxiliary devices (6); The cap beam (4) is constructed on the top of the retaining pile (3), and the waist beam (5) is constructed on the side of the retaining pile (3) near the deep foundation pit (11). Both the cap beam (4) and the waist beam (5) are connected to the main building structure (2), and several waist beams (5) are distributed vertically on the retaining pile (3). The waist beam (5) includes several reinforcing bars (51). One end of the reinforcing bar (51) is inserted into the retaining pile (3), and the other end is close to the main building structure (2). The auxiliary device (6) includes a frame (61), an auxiliary component (62), and an adjustment component (63); the frame (61) is set on top of the retaining pile (3), and the capping beam (4) is located inside the capping beam (4) after construction; the auxiliary component (62) is set horizontally, located in the deep foundation pit (11) and close to the bottom of the deep foundation pit (11); the adjustment component (63) is set on the frame (61), and is used to control the auxiliary component (62) to move in the vertical direction; When the auxiliary component (62) moves downward to its limit position, the auxiliary component (62) covers the drainage ditch (12); when the auxiliary component (62) moves upward to approach the reinforcing steel bar (51) located at the bottom, the auxiliary component (62) is used to assist in the construction of the waist beam (5) located at the bottom.
2. The deep foundation pit support structure according to claim 1, characterized in that, The auxiliary component (62) includes a plurality of filter plates (622) for supplying water through and for intercepting concrete.
3. The deep foundation pit support structure according to claim 2, characterized in that, The auxiliary component (62) includes two filter plates (622) and also includes a connecting plate (621). The adjustment component (63) is directly connected to the connecting plate (621). The length direction of the connecting plate (621) is parallel to the inner wall of the adjacent deep pit (11), and the two filter plates (622) are respectively arranged on both sides of the connecting plate (621). The filter plate (622) is rotatably connected to the connecting plate (621), and its rotation axis is parallel to the length direction of the connecting plate (621). When the filter plate (622) rotates downward to the limit position, it is inclined downward relative to the connecting plate (621).
4. The deep foundation pit support structure according to claim 3, characterized in that, The auxiliary component (62) also includes a movable part (623); The movable part (623) is movably connected to the connecting plate (621), its direction of movement is vertical, and it moves with the rotation of the filter plate (622); When the auxiliary component (62) covers the drainage ditch (12), the filter plate (622) rotates upward to its limit position, and the movable part (623) moves downward to its limit position; after the auxiliary component (622) moves upward, the filter plate (622) rotates downward to its limit position, and the movable part (623) moves upward to its limit position; during the process of the auxiliary component (62) moving upward toward the reinforcing steel bar (51) located at the bottom, the movable part (623) is forced to move downward to its limit position.
5. A deep foundation pit support structure according to claim 4, characterized in that, The adjustment assembly (63) includes a plurality of connecting rods (631) and a plurality of positioning elements (632) that correspond one-to-one. The connecting rod (631) is movably connected to the frame (61) in the vertical direction, and its bottom is detachably connected to the connecting plate (621); the positioning member (632) is movably connected to the frame (61) in the horizontal direction, and when the positioning member (632) contacts the connecting rod (631), it restricts the movement of the connecting rod (631) in the vertical direction.
6. A deep foundation pit support structure according to claim 5, characterized in that, The auxiliary component (62) also includes a plurality of extensions (624) corresponding one-to-one with the plurality of connecting rods (631). The extensions (624) are vertically disposed on the top of the connecting plate (621), and the interior of the extensions (624) is provided with drainage holes (625). When the construction of the waist beam (5) at the bottom is completed and the connecting rod (631) is disconnected from the connecting plate (621), the space above the waist beam (5) and the space below it are connected through a number of drainage holes (625), and the drainage holes (625) are aligned with the drainage ditch (12) in the vertical direction.
7. A deep foundation pit support structure according to claim 6, characterized in that, The connecting rod (631) is threadedly engaged with the extension (624).
8. A deep foundation pit support structure according to claim 7, characterized in that, The end of the positioning member (632) near the connecting rod (631) is used to engage with the groove formed between adjacent threads on the outside of the connecting rod (631).
9. A deep foundation pit support structure according to claim 8, characterized in that, The extension (624) is rotatably connected to the connecting plate (621). When the positioning member (632) restricts the connecting rod (631) from moving in the vertical direction, the connecting rod (631) can rotate freely relative to the positioning member (632).
10. A method for replacing supports, based on a deep foundation pit support replacement structure as described in any one of claims 1-9, characterized in that, Before replacing the support, the auxiliary device (6) is installed based on the retaining pile (3), and the auxiliary component (62) covers the drainage ditch (12), including the following steps: S1. After the main building structure (2) located at the bottom of the deep foundation pit (11) is completed, the auxiliary component (62) is moved upward and then the auxiliary component (62) is used as the bottom mold to support the bottom waist beam (5) at the position of the retaining pile (3) near the bottom. S2. After the construction of the waist beam (5) located at the bottom is completed, the corresponding internal support structure is removed, and the adjustment component (63) is removed. S3. Continue construction of the main building structure (2) to a certain height, then construct another waist beam (5) using formwork, and then remove the corresponding internal support structure. S4. Repeat steps S3 until the construction of the main building structure (2) in the deep foundation pit (11) is completed; S5. Construct the cap beam (4) on the top of the retaining pile (3) based on the frame (61), and make the main building structure (2) and the top of the retaining pile (3) form a force transmission connection through the cap beam (4), and then remove the corresponding internal support structure.