Deep and shallow pit supporting structure
By setting a force-transmitting corbel at the lower part of the shallow pit bottom plate and connecting it with the upper shallow pit bottom plate through integral casting, the problem of uneven support force transmission at the junction of deep and shallow pits is solved, the stability and safety of the foundation pit are achieved, and at the same time, engineering costs and construction time are saved.
Patent Information
- Application Number
- CN202422872742.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-11-25
AI Technical Summary
The existing support and force transmission structure at the junction of deep and shallow pits has unbalanced force, which leads to instability of the foundation pit, poor deformation control, inconvenience in construction and high economic cost.
A force transmission corbel is set at the lower part of the shallow pit bottom plate, which is fixedly connected to the upper shallow pit bottom plate by integral casting through the force transmission corbel, and fixed to the top crown beam of the inner retaining pile. The supporting force is transmitted to the retaining piles outside the shallow pit through the second supporting beam, the top crown beam of the inner retaining pile, the force transmission corbel, the shallow pit bottom plate, and the shallow pit bottom plate exchange support to balance the soil pressure on both sides of the deep and shallow pits.
The balance of soil pressure on both sides of the deep and shallow pits is achieved, the stability and safety of the foundation pit are guaranteed, and the project cost and construction period are reduced.
Smart Images
Figure CN223386650U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of deep foundation pit support, in particular to a deep and shallow pit support structure. Background Art
[0002] With the rapid development of urban underground space construction in my country, the combination of deep and shallow pits within the same underground space is becoming increasingly common. Stable and reliable support and force transmission at the junction of deep and shallow pits is crucial for ensuring the stability of deep foundation pits and controlling their deformation.
[0003] Currently, the common support and force transmission structures at the junction of deep and shallow pits are: (1) inner retaining piles and crown beams are set at the junction of deep and shallow pits. The crown beam on the top of the inner retaining pile is not connected to the bottom plate of the shallow pit. After the outer retaining piles are subjected to soil pressure, the second support beam is subjected to force and is transmitted to the soil layer under the bottom plate of the shallow pit through the crown beam on the top of the inner retaining pile; (2) The supporting force is transmitted to the retaining piles on the outside of the shallow pit by constructing a second support beam through a trench excavated at the bottom of the shallow pit bottom plate.
[0004] The current support force transmission technology structure has the following problems: (1) Since the deep pit area has a large excavation depth and bears a large supporting force, the shallow pit and the deep-shallow pit junction area have a shallow excavation depth and bear a small supporting force, resulting in unbalanced forces on both sides, which can easily lead to instability and damage of the foundation pit, poor deformation control of the foundation pit, and unsafe conditions; (2) In order to balance the forces on both sides, the diameter and length of the inner retaining piles at the deep-shallow pit junction area need to be increased, which has a high economic cost.
[0005] The current support force transmission technology structure II has the following problems: (1) the excavation of trenches under the shallow pit bottom plate is inconvenient and labor-intensive, and at the same time disturbs the original soil under the shallow pit bottom plate, affecting the bearing capacity; (2) the range of the second support beam is increased, and a large number of second supports need to be set up, which is uneconomical and takes a long time to complete. Utility Model Content
[0006] Purpose of the utility model: This utility model mainly solves the problem of force transmission between deep and shallow pits at the junction of existing deep and shallow pits, and proposes a shallow pit bottom plate as a force transmission method for deep and shallow pits. By arranging a force transmission corbel at the lower part of the shallow pit bottom plate, the force transmission corbel and the upper shallow pit bottom plate are cast as a whole at the same time, and the horizontal pre-embedded steel bars in the force transmission corbel are fixedly connected with the top crown beam of the inner retaining pile. The supporting force is transmitted to the retaining pile outside the shallow pit through the second supporting beam, the top crown beam of the inner retaining pile, the force transmission corbel, the shallow pit bottom plate, and the shallow pit bottom plate exchange support, thereby balancing the soil pressure on both sides of the deep and shallow pits and ensuring the stability and reliability of the support force transmission. This ensures the safety of the foundation pit, avoids the occurrence of foundation pit accidents, and greatly saves the project cost and construction period.
[0007] In order to solve the above technical problems, the present invention proposes the following technical solutions:
[0008] A deep and shallow pit support structure, comprising:
[0009] The outer retaining piles are set on the outer sides of the deep pit and the shallow pit respectively;
[0010] The inner retaining piles are set at the junction of the deep pit and the shallow pit;
[0011] The inner retaining pile top beam is arranged on the top of the inner retaining pile;
[0012] A shallow pit bottom plate is arranged at the bottom of the shallow pit, and one end of the shallow pit bottom plate is connected to the outer retaining pile outside the shallow pit;
[0013] The force transmission bracket is set below the shallow pit floor, one end of which is connected to the top beam of the inner retaining pile, and the other end is connected to the shallow pit floor, supporting the shallow pit floor and used to transmit the force of the second support beam to the shallow pit floor;
[0014] The second supporting beam has one end connected to the top beam of the inner retaining pile and the other end connected to the outer retaining pile outside the deep pit;
[0015] The first supporting beam is connected at both ends to the outer retaining piles on the outside of the deep pit and the outside of the shallow pit respectively.
[0016] Furthermore, the steel bars in the force-transfer corbel are anchored into the interior of the shallow pit bottom plate; the shallow pit bottom plate and the force-transfer corbel are integrally cast and consolidated in connection.
[0017] Furthermore, the force-transmitting corbel is pre-embedded with horizontal steel bars, and the inner retaining pile crown beam is fixedly connected to the force-transmitting corbel via the pre-embedded steel bars.
[0018] Furthermore, the outer retaining piles and the shallow pit bottom plate are connected by replacing the shallow pit bottom plate supports.
[0019] Furthermore, the first support beam and the outer retaining pile are connected via a crown beam on the outer retaining pile.
[0020] Furthermore, the second support beam is connected to the outer retaining piles via a purlin.
[0021] Beneficial Effects: By installing a force-transmitting bracket at the bottom of the shallow pit floor, the bracket is cast integrally with the upper shallow pit floor simultaneously. Pre-embedded horizontal reinforcement within the bracket is fixedly connected to the top beam of the inner retaining pile. The supporting force is transmitted to the outer retaining piles of the shallow pit through a second support beam, the top beam of the inner retaining pile, the bracket, the shallow pit floor, and the shallow pit floor exchange support. This balances the soil pressure on both sides of the deep and shallow pits, resolving the shortcomings and defects of existing technologies. This structure offers advantages such as stability and reliability, high safety, easy construction, low cost, and reduced construction time. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1This is a schematic diagram of the first construction step of the support and force transmission structure of the present utility model;
[0023] Figure 2 This is a schematic diagram of the second construction step of the support and force transmission structure of the utility model;
[0024] Figure 3 This is a schematic diagram of the third construction step of the support and force transmission structure of the utility model;
[0025] Figure 4 This is a schematic diagram of the fourth construction step of the support and force transmission structure of the present utility model;
[0026] Figure 5 This is a schematic diagram of the fifth construction step of the support and force transmission structure of the present utility model;
[0027] Figure 6 This is a schematic diagram of the sixth construction step of the support and force transmission structure of the present utility model;
[0028] Figure 7 This is a schematic diagram of the seventh construction step of the support and force transmission structure of the present utility model;
[0029] Figure 8 This is a schematic diagram of the eighth construction step of the support and force transmission structure of the present utility model;
[0030] Figure 9 This is a schematic diagram of the ninth construction step of the support and force transmission structure of the present invention;
[0031] Figure 10 This is a schematic diagram of the connection between the force transmission bracket, the shallow pit bottom plate, and the top crown beam of the inner retaining pile.
[0032] In the figure: 10 outer retaining piles, 11 inner retaining piles, 20 outer retaining pile top beams, 21 first supporting beam, 30 shallow pit bottom plate, 31 shallow pit bottom plate replacement support, 32 force transmission corbel, 33 reserved post-cast strips, 34 embedded steel bars, 40 inner retaining pile top beams, 41 second supporting beam, 42 purlin, 50 deep pit bottom plate, 51 deep pit bottom plate replacement support, 52 basement outer wall, 53 deep pit floor, 54 floor plate replacement support, 55 basement top plate. DETAILED DESCRIPTION
[0033] The present invention is further explained in detail below with reference to the accompanying drawings. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, modifications of various equivalent forms of the present invention (including but not limited to the number of basement floors, the number of support tracks, the form of corbels, the form of support, etc.) made by those skilled in the art all fall within the scope defined by the claims attached to this application.
[0034] like Figure 4 As shown, a deep and shallow pit support structure includes:
[0035] The outer retaining piles 10 are respectively arranged on the outer sides of the deep pit and the shallow pit;
[0036] The inner retaining pile 11 is set at the junction of the deep pit and the shallow pit;
[0037] The inner retaining pile top beam 40 is arranged on the top of the inner retaining pile 11;
[0038] The shallow pit bottom plate 30 is arranged at the bottom of the shallow pit, and one end of the shallow pit bottom plate is connected to the outer retaining pile 10 outside the shallow pit;
[0039] The force transmission bracket 32 is arranged below the shallow pit bottom plate 30, with one end connected to the inner retaining pile top crown beam 40 and the other end connected to the shallow pit bottom plate 30, supporting the shallow pit bottom plate 30 and used to transmit the force of the second support beam 41 to the shallow pit bottom plate 30;
[0040] A second support beam 41, one end of which is connected to the top beam 40 of the inner retaining pile, and the other end of which is connected to the outer retaining pile 10 outside the deep pit;
[0041] The first support beam 21 has its two ends connected to the outer retaining piles 10 outside the deep pit and outside the shallow pit respectively.
[0042] The user can carry out further construction based on the deep and shallow pit support structure as needed, and set up components such as the basement outer wall 52 and the basement top plate 55.
[0043] In a further embodiment, Figure 10 As shown, the steel bars in the force transmission corbel 32 are anchored into the interior of the shallow pit bottom plate 30; the shallow pit bottom plate 30 and the force transmission corbel 32 are integrally cast and consolidated;
[0044] The force transmission corbel 32 is pre-embedded with horizontal pre-embedded steel bars 34, and the inner retaining pile top crown beam 40 is fixedly connected to the force transmission corbel 32 through the pre-embedded steel bars 34;
[0045] The outer retaining pile 10 is connected to the shallow pit bottom plate 30 via the shallow pit bottom plate replacement support 31;
[0046] The first support beam 21 is connected to the outer retaining pile 10 via the outer retaining pile top beam 20;
[0047] The second support beam 41 is connected to the outer retaining pile 10 via a purlin 42 .
[0048] refer to Figure 1-10 As shown, the following describes a possible construction method of the utility model and the components used in the construction process:
[0049] like Figures 1 to 9As shown, the components used in this construction method include: outer retaining piles 10, inner retaining piles 11, outer retaining pile top beams 20, first support beams 21, shallow pit bottom plate 30, shallow pit bottom plate replacement support 31, force transmission corbels 32, reserved post-cast strips 33, embedded steel bars 34, inner retaining pile top beams 40, second support beams 41, purlins 42, deep pit bottom plate 50, deep pit bottom plate replacement support 51, basement outer wall 52, deep pit floor slab 53, floor slab replacement support 54, basement top plate 55.
[0050] The upper portion of the outer retaining pile 10 is fixedly connected to the outer retaining pile top beam 20; the outer retaining pile top beam 20 is integrally cast and consolidatedly connected to the first support beam 21;
[0051] The force transmission corbel 32 is arranged below the shallow pit bottom plate 30, and the steel bars in the force transmission corbel 32 are anchored inside the shallow pit bottom plate 30; the shallow pit bottom plate 30 and the force transmission corbel 32 are integrally cast and consolidated, and a reserved post-cast strip 33 is left; the force transmission corbel 32 is pre-embedded with horizontal pre-embedded steel bars 34; the outer retaining pile 10 and the shallow pit bottom plate 30 are connected by a shallow pit bottom plate replacement support 31, and the shallow pit bottom plate replacement support 31 is fixedly connected to the outer retaining pile 10 and the shallow pit bottom plate 30;
[0052] The upper part of the inner retaining pile 11 is fixedly connected to the inner retaining pile top beam 40; the inner retaining pile top beam 40 is fixedly connected to the force transmission corbel 32 through the embedded steel bar 34; the second support beam 41 is integrally cast and consolidated with the purlin 42 and the inner retaining pile top beam 40; the purlin 42 is fixedly connected to the outer retaining pile 10; during the construction process, the purlin 42, the second support beam 41, the inner retaining pile top beam 40, the force transmission corbel 32, the shallow pit bottom plate 30, and the shallow pit bottom plate replacement support 31 constitute a deep and shallow pit support force transmission system;
[0053] The deep pit replacement support block 51 is cast simultaneously with the deep pit bottom plate 50 , and the deep pit replacement support block 51 is fixedly connected to the outer retaining pile 10 and the inner retaining pile 11 ;
[0054] The deep pit floor 53 and the floor replacement support 54 are integrally cast and consolidated; the floor replacement support 54 is fixedly connected to the outer retaining pile 10; the deep pit floor 53 and the shallow pit bottom plate 30 above the inner retaining pile crown 40 are integrally cast and consolidated.
[0055] The specific construction steps are as follows: Figures 1 to 10 As shown,
[0056] S1, such as Figure 1 As shown, the outer retaining piles 10 and the inner retaining piles 11 are constructed first;
[0057] S2, such as Figure 2As shown, the outer retaining pile crown beam 20 and the first support beam 21 on the upper part of the outer retaining pile 10 are constructed;
[0058] S3, such as Figure 3 As shown, after the outer retaining pile top beam 20 and the first support beam 21 reach the designed strength, excavate downward to the bottom of the shallow pit bottom plate 30, reserve a post-casting strip 33, and at the same time cast the shallow pit bottom plate 30 and the force transmission bracket 32 to set the shallow pit bottom plate replacement support 31;
[0059] S4, such as Figure 4 As shown, the earthwork in the deep pit area is excavated to the bottom of the second support beam 41, and the purlin 42, the inner retaining pile top beam 40 and the second support 41 are constructed. The inner retaining pile top beam 40 is fixedly connected to the force transmission bracket 32 through the embedded steel bars 34;
[0060] S5, such as Figure 5 As shown, after the surrounding purlin 42, the second supporting beam 41, and the crown beam 40 reach the designed strength, excavation is carried out downward to the bottom of the deep pit floor 50, and the deep pit floor 50 and the deep pit floor replacement support 51 are cast;
[0061] S6, such as Figure 6 As shown, after the pit floor 50 and the pit floor replacement support 51 reach the design strength, the purlin 42 and the second support 41 are removed, and the basement exterior wall 52 is constructed upwards;
[0062] S7, such as Figure 7 As shown, the deep pit floor 53 and the shallow pit bottom 30 on the upper part of the inner retaining pile crown beam 40 are constructed, and the floor replacement support 54 is set;
[0063] S8, such as Figure 8 As shown, after the floor slab replacement support 54, the floor slab 53 and the shallow pit bottom plate 30 have reached sufficient strength, the first support beam 21 is removed;
[0064] S9, such as Figure 9 As shown, the basement top plate structure 55 is constructed, the entire basement construction is completed, and the foundation pit is backfilled.
[0065] This solves the problems of existing deep and shallow pit support force transmission technology at the junction of deep and shallow pits, such as unbalanced force, poor foundation pit stability, insufficient foundation pit safety, poor economy, inconvenient construction, and long construction period.
Claims
1. A deep and shallow pit support structure, characterized in that: include: The outer retaining piles are set on the outer sides of the deep pit and the shallow pit respectively; The inner retaining piles are set at the junction of the deep pit and the shallow pit; The inner retaining pile top beam is arranged on the top of the inner retaining pile; A shallow pit bottom plate is arranged at the bottom of the shallow pit, and one end of the shallow pit bottom plate is connected to the outer retaining pile outside the shallow pit; The force transmission bracket is set below the shallow pit floor, with one end connected to the top beam of the inner retaining pile and the other end connected to the shallow pit floor to support the shallow pit floor and transmit the force of the second support beam to the shallow pit floor; The second supporting beam has one end connected to the top beam of the inner retaining pile and the other end connected to the outer retaining pile outside the deep pit; The first supporting beam is connected at both ends to the outer retaining piles on the outside of the deep pit and the outside of the shallow pit respectively.
2. A deep and shallow pit support structure according to claim 1, characterized in that: The steel bars in the force-transmitting corbel are anchored into the interior of the shallow pit bottom plate; the shallow pit bottom plate and the force-transmitting corbel are integrally cast and consolidatedly connected.
3. The deep and shallow pit support structure according to claim 1, characterized in that: The force transmission corbel is pre-embedded with horizontal embedded steel bars, and the inner retaining pile top crown beam is fixedly connected to the force transmission corbel through the embedded steel bars.
4. The deep and shallow pit support structure according to claim 1, characterized in that: The outer retaining piles and the shallow pit bottom plate are connected by shallow pit bottom plate replacement supports.
5. The deep and shallow pit support structure according to claim 1, characterized in that: The first support beam and the outer retaining pile are connected via the crown beam on the outer retaining pile.
6. The deep and shallow pit support structure according to claim 1, characterized in that: The second supporting beam is connected to the outer retaining piles through a purlin.