Reverse force transmission structure

Abstract

The utility model belongs to the technical field of foundation engineering, and particularly relates to a reverse construction force transmission structure which comprises a steel supporting box, an enclosure wall, a reverse construction structure, a reinforced steel beam, a force transmission piece and a jacking force control device. The anchoring end plate is fixedly installed on the enclosure wall through the anchor bars, the bottom supporting plate is located at the bottoms of the anchoring end plate, the vertical rib plate and the anchor bars, the vertical rib plate is placed on the bottom supporting plate, and the vertical rib plate and the anchoring end plate form a jack partition bin, a power source partition bin and a monitoring sensor partition bin. According to the utility model, the reverse force transmission structure is designed in the structure, the monitoring sensor in the structure adopts an infrared distance measuring sensor to measure the relative horizontal deformation of the boundary beam and the enclosure wall in real time, meanwhile, data is transmitted to the active control system, and the purpose of controlling the deformation is achieved through the jack; the reverse supporting structure can actively regulate and control deformation, and the protection requirement of facilities in a special environment cannot be met due to deformation of a foundation pit.

Description

Technical Field

[0001] The utility model belongs to the technical field of foundation engineering, and in particular relates to a reverse force transmission structure. Background Art

[0002] In densely populated areas of soft soil, the surrounding environmental protection requirements are high. When the foundation pit is close to rail transit facilities, raw water, high-speed rail facilities, large-scale power transmission and transformation equipment, precision instruments, historical protection buildings and other structures, it is extremely difficult to control the deformation of the foundation pit. The reverse construction method is a common construction method for foundation pit engineering. The reverse construction method has the advantages of large horizontal support rigidity, low cost, and green environmental protection. However, the traditional reverse construction method foundation pit still has many shortcomings in deformation control:

[0003] (1) When constructing the foundation pit, the earthwork must be excavated first, and then the top-down structure is constructed. Since the top-down structure is a permanent main structure, compared with the temporary support, the construction requirements of the top-down main structure are higher, the deviation control standards and maintenance requirements are more stringent, and the structure production volume is also larger. Therefore, the construction period of the top-down structure is longer than that of the temporary support. Therefore, although the horizontal stiffness of the top-down structure is greater than that of the temporary support, by the time the top-down structure is in place and functions, the retaining wall has undergone significant deformation.

[0004] (2) The traditional main structure of the reverse-built structure is also a passive load-bearing component, that is, the reverse-built structure can only passively provide reaction force after the surrounding wall is deformed and the reverse-built structure is subjected to horizontal compression.

[0005] (3) As the scale of the foundation pit increases, the creep shrinkage and temperature shrinkage of the support structure itself become obvious. Even if the water and soil pressure outside the pit does not increase, the support structure will still deform.

[0006] The above problems are extremely unfavorable for the control of foundation pit deformation and cannot meet the protection requirements of special environmental facilities. To this end, this patent discloses a reverse force transmission structure that can effectively solve the above technical problems. Utility Model Content

[0007] The purpose of the utility model is to provide a reverse force transmission structure, aiming to solve the problem in the prior art that as the scale of the foundation pit increases, the creep shrinkage and temperature shrinkage of the support structure itself are obvious, and even if the water and soil pressure outside the pit does not increase, the support structure still has deformation development.

[0008] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a reverse-work force transmission structure, comprising a steel support box, a retaining wall, a reverse-work structure, a reinforced steel beam, a force transmission member and a top force control device;

[0009] The anchor end plate is fixedly installed on the retaining wall through anchor bars. The bottom support plate is located at the bottom of the anchor end plate, vertical rib plates and anchor bars. The vertical rib plates are placed on the bottom support plate and form a hydraulic jack compartment, a power supply compartment and a monitoring sensor compartment with the anchor end plate;

[0010] The top-down structure includes top-down beams, top-down plates, columns, column piles and side beams. The top-down plates are installed on the top-down beams. The top-down beams are connected together by columns. The head ends of the columns are installed on the column piles. The top-down structure is provided with side beams along the direction parallel to the retaining wall. Reinforcing steel beams are supported on the side beams, and the other ends of the reinforcing steel beams are supported on the top-down beams;

[0011] Steel support boxes and force transfer members are placed at intervals between the side beams and the retaining wall. One end of the force transfer member is fixed to the side beam, and the other end is supported against the retaining wall;

[0012] The jacking force control device includes a hydraulic jack, a monitoring sensor, a power supply and a control platform. The hydraulic jack, the monitoring sensor and the power supply are respectively placed in the hydraulic jack compartment, the monitoring sensor compartment and the power supply compartment in the steel support box. One end of the hydraulic jack is supported against the anchor end plate, and the other end of the hydraulic jack is supported against the side beam outside the top-down structure.

[0013] Preferably, in a top-down force transfer structure of the present utility model, the reinforcing steel beam is an H-shaped steel.

[0014] Preferably, in a top-down force transfer structure of the present utility model, the force transfer member can be a reinforced concrete slab or a steel beam.

[0015] Preferably, in a top-down force transfer structure of the present utility model, the column can be a lattice column, a steel pipe, a concrete-filled steel pipe or a steel section. The column is fixed above the column pile, and the column provides vertical support for the top-down structure.

[0016] Preferably, in a top-down force transfer structure of the present utility model, the monitoring sensor is provided with a wireless transmission device and is connected to the control platform in real time through a wireless signal.

[0017] Compared with the prior art, the beneficial effects of the present utility model are:

[0018] The present utility model designs a top-down force transfer structure. In this structure, the monitoring sensor uses an infrared distance measuring sensor to measure the relative horizontal deformation between the side beam and the retaining wall in real time, and at the same time transmits the data to the active control system, and achieves the purpose of controlling the deformation through the jack. This top-down support structure can actively regulate the deformation and will not cause the protection requirements of special environmental facilities due to the deformation of the foundation pit. Description of the Drawings

[0019] The accompanying drawings are used to provide a further understanding of the present utility model and form a part of the specification. Together with the embodiments of the present utility model, they are used to explain the present utility model and do not constitute a limitation to the present utility model. In the drawings:

[0020] Figure 1 It is a schematic structural diagram of the steel support box of the present utility model;

[0021] Figure 2 It is a schematic sectional view of the reverse construction force transfer structure of the present utility model;

[0022] Figure 3 It is a schematic front view structural diagram of the reverse construction force transfer of the present utility model;

[0023] Figure 4 It is a schematic sectional front view structural diagram of the reverse construction force transfer of the present utility model.

[0024] In the figure: 1. Steel support box; 11. Anchor end plate; 12. Bottom support plate; 13. Vertical rib plate; 14. Anchor bar; 21. Reverse beam; 22. Reverse plate; 3. Side beam; 4. Force transfer member; 5. Reinforcing steel beam; 6. Jack force control device; 70. Column pile; 71. Column. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present utility model.

[0026] Please refer to Figures 1 - 4 , the present utility model provides the following technical solutions: A reverse construction force transfer structure, including a steel support box 1, a retaining wall, a reverse construction structure, a reinforcing steel beam 5, a force transfer member 4, and a jack force control device 6;

[0027] The anchor end plate 11 is fixedly installed on the retaining wall through the anchor bar 14. The bottom support plate 12 is located at the bottom of the anchor end plate 11, the vertical rib plate 13, and the anchor bar 14. The vertical rib plate 13 is placed on the bottom support plate 12 and forms a jack compartment, a power supply compartment, and a monitoring sensor compartment with the anchor end plate 11;

[0028] The top-down structure includes top-down beams 21, top-down slabs 22, columns 71, column piles 70 and side beams 3. The top-down slabs 22 are installed on the top-down beams 21. The top-down beams 21 are connected together by the columns 71. The head ends of the columns 71 are installed on the column piles 70. The columns 71 can be lattice columns, steel pipes, concrete-filled steel pipes or steel sections. The columns 71 are fixed above the column piles 70. The columns 71 provide vertical support for the top-down structure. The top-down structure is provided with side beams 3 along the direction parallel to the retaining wall. Reinforcing steel beams 5 are propped against the side beams 3. The other ends of the reinforcing steel beams 5 are propped against the top-down beams 21. The reinforcing steel beams 5 are made of H-shaped steel.

[0029] Steel support boxes 1 and force transfer members 4 are placed at intervals between the side beams 3 and the retaining wall. One end of the force transfer member 4 is fixed to the side beam 3, and the other end is propped against the retaining wall. The force transfer member 4 can be a reinforced concrete slab or a steel beam.

[0030] The jacking force control device 6 includes a hydraulic jack, a monitoring sensor, a power supply and a control platform. The hydraulic jack, the monitoring sensor and the power supply are respectively placed in the jack compartment, the monitoring sensor compartment and the power supply compartment in the steel support box 1. The monitoring sensor is provided with a wireless transmission device and is connected to the control platform in real time through a wireless signal. One end of the hydraulic jack is propped against the anchor end plate 11, and the other end of the hydraulic jack is propped against the side beam 3 on the outside of the top-down structure.

[0031] An implementation method of a top-down force transfer structure includes the following steps:

[0032] 1. Construct the retaining wall, columns 71 and column piles 70 of the foundation pit, and set up a control platform outside the pit;

[0033] 2. After the foundation pit is excavated to the predetermined elevation, construct the top-down structure and the force transfer members 4;

[0034] 3. Fix the steel support boxes 1 on the retaining wall and install the jacking force control device 6 in the steel support boxes 1;

[0035] 4. When the top-down structure and the side beam 3 reach the strength, the hydraulic jack applies the jacking force, and the retaining wall is separated from the force transfer member 4;

[0036] 5. The monitoring sensor measures the relative horizontal deformation between the side beam 3 and the retaining wall in real time, and feeds the deformation data back to the control platform. The control platform can adjust the jacking force of the hydraulic jack in real time to achieve the purpose of controlling the deformation.

[0037] 6. When the retaining wall is separated from the force transfer member 4, the gap between the force transfer member 4 and the retaining wall is filled with high-strength grouting material or steel plate pads are set.

[0038] Working principle of implementation: When the hydraulic jack does not provide jacking force, the retaining wall directly presses against the force transfer member 4, and transfers the lateral pressure of water and soil to the side beam 3 and the top-down structure through the force transfer member 4; when the hydraulic jack provides jacking force, the retaining wall can be jacked away from the force transfer member 4, then the lateral pressure is transferred to the hydraulic jack through the retaining wall, and then transferred to the side beam 3 and the top-down structure by the hydraulic jack; after the retaining wall and the force transfer member 4 are disengaged, high-strength grouting material or steel plate pads can be set in the gap between the force transfer member 4 and the retaining wall to avoid the loss of jacking force caused by accidental failures of the hydraulic jack.

[0039] The control logic of the control platform for the jacking force of the hydraulic jack includes the following steps:

[0040] S1: Determine the upper limit control value F of the jacking force of the hydraulic jack according to the bearing capacity of the retaining wall and the top-down structure max , and the jacking force during construction shall not exceed F max .

[0041] S2: Determine the upper limit control value S of the relative horizontal deformation between the retaining wall and the side beam 3 according to the stiffness of the top-down structure max , during construction, the monitoring sensor monitors the relative horizontal deformation S between the retaining wall and the side beam 3 in real time. When the measured S reaches S max , the jack should actively relieve pressure until S is less than S max .

[0042] S3: Determine the difference control value S of the relative horizontal deformation between the retaining wall and the side beam 3 according to the bearing capacity of the side beam 3 and the spacing of the jacks Δ , when the difference between the two relative horizontal deformations S1 and S2 (S1 is the larger value) measured by two adjacent sensors exceeds S Δ , the jacking force of the jack at S2 should be increased until the difference is less than S Δ .

[0043] Finally, it should be noted that the above are only the preferred embodiments of the present invention and are not used to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A reverse force transmission structure, characterized in that: It comprises a steel support box (1), a retaining wall, a reverse construction structure, a reinforced steel beam (5), a force transmission member (4) and a top force control device (6); An anchoring end plate (11) is fixedly installed on the enclosure wall via anchor bars (14); a bottom support plate (12) is provided at the bottom of the anchoring end plate (11), the vertical rib plate (13) and the anchor bars (14); the vertical rib plate (13) is placed on the bottom support plate (12) and forms a jack compartment, a power compartment and a monitoring sensor compartment with the anchoring end plate (11); The reverse-built structure comprises a reverse-built beam (21), a reverse-built plate (22), a column (71), a column pile (70) and a side beam (3); the reverse-built beam (21) is installed with a reverse-built plate (22); the reverse-built beams (21) are connected together through the columns (71); the head ends of the columns (71) are installed on the column piles (70); the reverse-built structure is provided with a side beam (3) in a direction parallel to the retaining wall; the side beam (3) is supported by a reinforcing steel beam (5); the other end of the reinforcing steel beam (5) supports the reverse-built beam (21); A steel support box (1) and a force transmission member (4) are placed between the side beam (3) and the enclosure wall, one end of the force transmission member (4) is fixed to the side beam (3), and the other end is supported against the enclosure wall; The jacking force control device (6) comprises a hydraulic jack, a monitoring sensor, a power supply and a control platform. The hydraulic jack, the monitoring sensor and the power supply are respectively placed in a jack compartment, a monitoring sensor compartment and a power supply compartment in the steel support box (1). One end of the hydraulic jack supports the anchor end plate (11), and the other end of the hydraulic jack supports the side beam (3) on the outside of the reverse structure.

2. A reverse force transmission structure according to claim 1, characterized in that: The reinforcing steel beam (5) is made of H-shaped steel.

3. The reverse force transmission structure according to claim 1, characterized in that: The force transmission member (4) may be a reinforced concrete slab or a steel beam.

4. The reverse force transmission structure according to claim 1, characterized in that: The columns (71) may be lattice columns, steel pipes, steel tube concrete or profiled steel. The columns (71) are fixed above the column piles (70). The columns (71) provide vertical support for the reverse structure.

5. The reverse force transmission structure according to claim 1, characterized in that: The monitoring sensor is provided with a wireless transmission device and is connected to the control platform in real time via wireless signals.

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