A protective device for preventing surrounding buildings from settling due to deep foundation pit excavation

Abstract

The invention discloses a protective device for preventing surrounding buildings from settling due to deep foundation pit excavation in the technical field of foundation and foundation engineering construction. The device comprises isolation piles and isolation plates. A plurality of isolation piles are evenly arranged and are distributed with support parts and fixing parts. The isolation piles of the support parts are distributed in a Y shape, and the isolation piles of the fixing parts are distributed in a closed geometric pattern. A retaining plate group is installed between the isolation piles of the fixing parts, and a connecting plate group is installed between the isolation piles of the supporting parts. The bottoms of the isolation piles are commonly connected with a bottom connector, and the tops of the isolation piles are commonly connected with a top connector. A docking body is provided on one side of the top connector and a balancing body is provided on the other side. The docking body is used to connect with the foundations of the protected surrounding buildings. The invention effectively resists soil displacement through the orderly distribution of the isolation piles and the connection between the retaining plate group and the connecting plate group therebetween, plays a certain supporting role for the surrounding buildings, and effectively avoids settlement.

Description

Technical Field

[0001] The invention relates to the technical field of foundation and basic engineering construction technology, and in particular to a protective device for preventing surrounding buildings from settling due to deep foundation pit excavation. Background Art

[0002] In recent years, the development of underground space resources has been accelerating and on a larger scale, especially in deep foundation pit projects. Deep foundation pits have the characteristics of wide excavation range and great depth. During the excavation process, they often cause excessive settlement of surrounding buildings, leading to safety accidents such as building tilting, damage and collapse. The current traditional practice is to set isolation piles between the foundation pit retaining structure and the building to play a deformation partition role, which has a better effect when the stratum conditions outside the pit are soil layers; or before the foundation pit construction, compaction grouting is used to increase the bearing capacity of the foundation of the adjacent protected building foundation, but this method will disturb the soil under the foundation of the protected building, resulting in uneven settlement of the protected building.

[0003] In the prior art, the isolation structure between the foundation pit and the protected building is often a single linear structure, which has poor anti-tilting and soil-fixing capabilities. Therefore, the cost of preventing subsidence is often high and the effect is limited. The current connection form between the isolation piles and the steel sheet piles is also limited. Most of them can only achieve linear connection and cannot be flexibly set. The water-stopping and sealing performance of the connection is weak. If the deep foundation pit project is in a sandy stratum rich in pressurized water and penetrates the pressurized water layer, it will not be able to meet the requirements of deep foundation pit construction.

[0004] Based on this, the present invention designs a protective device for preventing surrounding buildings from settling due to deep foundation pit excavation, so as to solve the above-mentioned problem. Summary of the invention

[0005] The object of the present invention is to provide a protective device for preventing surrounding buildings from settling due to deep foundation pit excavation, so as to solve the problems that the existing isolation structures proposed in the above background technology have poor anti-tilting and soil fixing capabilities; and the current connection forms between isolation piles and steel sheet piles are also relatively limited, most of which can only achieve linear connections, cannot be flexibly set, and have weak water-stopping and sealing performance at the connections.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a protective device for preventing surrounding buildings from sinking due to deep foundation pit excavation, comprising isolation piles and isolation plates, wherein the isolation piles are evenly provided with a plurality of supporting parts and fixed parts, the supporting parts are connected to the two ends of the fixed parts, the isolation piles of the supporting parts are distributed in a Y shape, and the isolation piles of the fixed parts are distributed in a closed geometric shape, a retaining plate group is installed between the isolation piles of the fixed parts, and a connecting plate group is installed between the isolation piles of the supporting parts, the bottom of the isolation piles are commonly connected with a bottom connector, the top of the isolation piles are commonly connected with a top connector, the top connector is located between the deep foundation pit and the protected surrounding buildings, a docking body is provided on one side of the top connector and a balancing body is provided on the other side, and the docking body is used to connect with the foundation of the protected surrounding buildings.

[0007] As a further solution of the present invention, the isolation piles of the fixing part are distributed in a symmetrical closed geometric pattern, and the retaining plate group between the isolation piles of the fixing part protrudes toward one side of the protected surrounding buildings.

[0008] As a further solution of the present invention, the outer side of the isolation pile of the fixed part is fixedly connected with a connecting groove, the retaining plate group includes an end plate and a standard plate, one end of the end plate is fixedly connected with a plug plate, the plug plate is plugged into the connecting groove, one end of the standard plate is fixedly connected with a column, the side wall of the column is provided with a plurality of selection grooves, and the selection grooves are plugged into the plate body of the end plate or other standard plates.

[0009] As a further solution of the present invention, the retaining plate group further comprises a column monomer, a plurality of monomer grooves are evenly formed on the side wall of the column monomer, and the column monomer is used for connecting the standard plate or the end plate.

[0010] As a further solution of the present invention, the isolation pile of the fixed part includes an inner tube and an outer tube, the inner tube and the outer tube are fixedly connected by a reinforcement plate, an arc plate is slidably provided between the inner tube and the outer tube, the end of the arc plate is fixedly connected with a connecting groove, the side wall of the outer tube is provided with a reinforcement groove, and the side wall of the arc plate is fixedly connected to the connecting groove through an integrated plate passing through the reinforcement groove.

[0011] As a further solution of the present invention, a positioning groove is provided in the connecting groove, a lug wheel is eccentrically connected to the positioning groove, the end of the lug wheel passes through the side wall of the outer cylinder and is located outside the inner cylinder, and an anti-slip strip is fixedly connected to the side wall of the inner cylinder.

[0012] As a further solution of the present invention, the isolation piles are steel pipe piles, and the isolation plates are steel sheet piles.

[0013] As a further solution of the present invention, a T-shaped connecting plate is fixedly connected to the outer side of the isolation pile of the supporting part, and the connecting plate group includes a plurality of double-headed plates, the ends of the double-headed plates are side opening tubes, the double-headed plates are connected to each other through the openings of the side opening tubes, and the T-shaped connecting plate is plugged into the side opening tubes of the double-headed plates.

[0014] As a further solution of the present invention, the bottom connector is a concrete member, and the top connector is a concrete member or a steel member.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The Y-shaped structure of the supporting part has stronger integrity. Due to its wider ground contact surface, it is more stable and not easy to tilt, and can effectively resist soil displacement. The fixed part forms a closed geometric figure, which can enclose the internal soil and restrict the movement of the whole piece, thereby avoiding the displacement of the soil to one side of the foundation pit, greatly reducing the stress on the foundation pit, and can effectively reduce the stress on the foundation pit support, which is beneficial to the maintenance and support of the side of the foundation pit during excavation.

[0017] Combined with the retaining plate group protruding toward the side of the protected building, a certain degree of soil squeezing effect can be produced, thereby more effectively resisting soil displacement, avoiding the collapse of the building, and facilitating the excavation control of the foundation pit.

[0018] Through the orderly distribution of isolation piles and the connection between the retaining plate group and the connecting plate group, the bottom connector and the top connector are used to connect the components into a more reliable whole, which plays a reliable stabilizing role for the soil between the foundation pit and the surrounding buildings, effectively resists the displacement of the soil, plays a certain supporting role for the surrounding buildings, effectively avoids settlement, reduces the side soil force during foundation pit excavation, and is conducive to foundation pit excavation construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of the present invention from a top view;

[0021] Figure 3 This is a schematic diagram of an application example of the overall structure of the present invention;

[0022] Figure 4 It is a half-section schematic diagram of the overall structure of the present invention from a top view;

[0023] Figure 5 For the present invention Figure 4 A schematic diagram of the enlarged structure of the middle part A;

[0024] Figure 6 For the present invention Figure 4 The enlarged structural diagram of the middle B part;

[0025] Figure 7 It is a schematic diagram of the overall structure of the present invention from a half-section side top view perspective;

[0026] Figure 8 This is a schematic diagram of the structure of the isolation pile from the top perspective in Example 3 of the present invention;

[0027] Fig. 9 This is a schematic diagram of the structure of the isolation pile from a side perspective in Example 3 of the present invention;

[0028] Fig.10 This is a schematic diagram of a half-section structure of an isolation pile from a side perspective in Example 3 of the present invention;

[0029] Fig.11 This is a schematic diagram of the enlarged structure of the isolation pile C portion in Example 3 of the present invention;

[0030] Fig.12 This is a schematic diagram of a half-section structure of an isolation pile in Example 3 of the present invention from a top view;

[0031] Fig.13 It is a schematic diagram of the overall structure of the present invention from a side view (the dotted line is the direction of land sliding).

[0032] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0033] 1. Isolation pile; 2. Support part; 3. Fixed part; 4. Retaining plate group; 5. Connecting plate group; 6. Bottom connector; 7. Top connector; 8. Docking body; 9. Balancing body; 10. Connecting groove; 41. End plate; 42. Standard plate; 43. Insert plate; 44. Column; 45. Selection groove; 46. Column monomer; 47. Monomer groove; 18. Inner tube; 19. Outer tube; 20. Reinforcement plate; 21. Arc plate; 22. Reinforcement groove; 23. Integrated plate; 24. Positioning groove; 25. Protruding handle wheel; 26. Anti-slip strip; 27. T-shaped connecting plate; 28. Double-end plate; 29. ​​Side opening tube. DETAILED DESCRIPTION

[0034] See also Figure 1-13 The working principle of the technical solution provided by the present invention is as follows: Example 1

[0035] See also Figure 1-4, 7, 13, comprising isolation piles 1 and isolation plates, the isolation piles 1 being evenly provided with a plurality of supporting parts 2 and fixing parts 3, the supporting parts 2 being connected at both ends of the fixing parts 3, the isolation piles 1 of the supporting parts 2 being distributed in a Y shape, the isolation piles 1 of the fixing parts 3 being distributed in a closed geometric shape, retaining plate groups 4 being installed between the isolation piles 1 of the fixing parts 3, connecting plate groups 5 being installed between the isolation piles 1 of the supporting parts 2, the bottoms of the isolation piles 1 being commonly connected with a bottom connector 6, the tops of the isolation piles 1 being commonly connected with a top connector 7, the top connector 7 being located between the deep foundation pit and the protected surrounding buildings, a docking body 8 being provided on one side of the top connector 7 and a balancing body 9 being provided on the other side, the docking body 8 being used for connecting with the foundation of the protected surrounding buildings.

[0036] The isolation piles 1 of the fixed part 3 are distributed in a symmetrical closed geometric pattern, and the retaining plate group 4 between the isolation piles 1 of the fixed part 3 protrudes toward one side of the surrounding buildings to be protected.

[0037] By setting an isolation structure between the protected building and the foundation pit, the soil between the two is effectively controlled to avoid soil displacement causing settlement of the protected building; when setting, the isolation piles 1 are evenly distributed and distributed according to the preset positions and driven into the ground. The distribution pattern of the driven isolation piles 1 is enclosed in the middle and Y-shaped at both ends, forming a structure of supporting parts 2 at both ends and a fixed part in the middle, and then the connecting plate group 5 is installed between the isolation piles 1 of the supporting part 2, and the isolation piles 1 in the supporting part 2 are connected in series and reliably connected together, and at the same time, each plate body is reliably connected when the connecting plate group 5 is installed; the retaining plate group 4 is installed between the isolation piles 1 of the fixing part 3, and the isolation piles 1 in the fixing part 3 are connected in series and reliably connected together, and at the same time, each plate body is reliably connected when the retaining plate group 4 is installed.

[0038] After the isolation piles 1 are installed, holes can be drilled at the bottom of the isolation piles 1 through the hole expansion piece, so that the holes at the bottom of adjacent isolation piles 1 are connected and then cast to form a bottom connector 6, thereby unifying and reliably connecting the bottoms of all isolation piles 1 to form a whole, thereby increasing the overall strength, effectively avoiding the displacement of a single column, making the force more dispersed and uniform, and greatly enhancing the strength and reliability of the isolation structure.

[0039] After the isolation piles 1 are uniformly fixed and connected at the bottom, the Y-shaped structure of the support part 2 has a stronger integrity. Due to the wider ground contact surface, it is more stable and not easy to tilt, and can effectively resist soil displacement. The fixed part 3 forms a closed geometric figure, which can enclose and confine the internal soil, restrict the movement of the whole piece, and thus avoid the displacement of the soil to one side of the foundation pit, greatly reducing the stress on the foundation pit, and can effectively reduce the stress on the foundation pit support, which is beneficial to the maintenance and support of the side of the foundation pit during foundation pit excavation.

[0040] On this basis, in combination with the retaining plate group 4 protruding toward the side of the protected building, a certain degree of soil squeezing effect can be produced, thereby more effectively resisting soil displacement, avoiding the collapse of the building, and facilitating the excavation control of the foundation pit.

[0041] After installing the retaining plate group 4 and the connecting plate group 5, all the isolation piles 1 are uniformly connected through the top connector 7 at the top of the isolation pile 1. At this time, according to the situation, the top of the isolation pile 1 can be made to exceed the top of the retaining plate group 4 and the connecting plate group 5, and the top connector 7 connects all the isolation piles 1 (this connection method can be used repeatedly after the top connector 7 is removed, and the retaining plate group 4 and the connecting plate group 5 are pulled out), or the top of the isolation pile 1 is flush with the top of the retaining plate group 4 and the connecting plate group 5, and the top connector 7 connects all the isolation piles 1, the retaining plate group 4 and the connecting plate group 5 (this method is more integrated and more stable, but it is not conducive to the reuse of the retaining plate group 4 and the connecting plate group 5 in the later stage); after the top connector 7 is set, At this time, one side of the entire isolation structure, namely the docking body 8, is reliably connected to the foundation of the protected building, so that the lateral force caused by the displacement of the soil of the protected building can be effectively transmitted to the isolation pile 1 below through the docking body 8 and the top connecting body 7, which supports and stabilizes the protected building. When the soil has a controllable displacement, it can avoid the settlement of the protected building, thereby gaining a certain amount of time for repair and rescue measures; the balancing body 9 provided therein can, in a more urgent situation, according to the specific stress conditions of the isolation structure and the possible tilting direction, be set to increase the downward pressure or upward pulling method to balance the protected building on the other side, thereby stabilizing the building in time, and providing a relatively easy and quick remedial control method.

[0042] Furthermore, through the orderly distribution of the isolation piles 1 and the connection between the retaining plate group 4 and the connecting plate group 5, the bottom connector 6 and the top connector 7 are used to connect the various components into a more reliable whole, which plays a reliable stabilizing role for the soil between the foundation pit and the surrounding buildings, effectively resists the displacement of the soil, plays a certain supporting role for the surrounding buildings, effectively avoids settlement, reduces the side soil force during foundation pit excavation, and is beneficial to the foundation pit excavation construction.

[0043] In this embodiment, both the retaining plate group 4 and the connecting plate group 5 can be made of steel sheet piles in the prior art and can be reliably connected. Example 2

[0044] See also Figure 1-58-12, the outer side of the isolation pile 1 of the fixed part 3 is fixedly connected with a connection groove 10, the retaining plate group 4 includes an end plate 41 and a standard plate 42, one end of the end plate 41 is fixedly connected with a plug plate 43, the plug plate 43 is plugged with the connection groove 10, one end of the standard plate 42 is fixedly connected with a column 44, the side wall of the column 44 is provided with a plurality of selection grooves 45, the selection grooves 45 are plugged with the plate body of the end plate 41 or other standard plates 42. The retaining plate group 4 also includes a column monomer 46, the side wall of the column monomer 46 is evenly provided with a plurality of monomer grooves 47, the column monomer 46 is used for connecting the standard plate 42 or the end plate 41.

[0045] The difference from Example 1 is that in order to make the plate bodies of the retaining plate group 4 butt joint and the plate bodies butt joint with the isolation piles 1 to achieve reliable connection under the premise that the retaining plate group 4 protrudes to one side, a connecting groove 10 is fixedly provided on the outer wall of the isolation pile 1 of the fixing portion 3, and combined with a selection groove 45 with a multi-angle setting, the standard plates 42 can be connected at a preset angle, and a reliable connection that can be sealed can be achieved, the land on both sides is effectively separated, and the water-stopping property is good. At the same time, the plug plate 43 is plugged into the connecting groove 10 to achieve a reliable connection between the end plate 41 and the isolation pile 1, which is more flexible; in combination with the column monomer 46, the standard plate 42 and the end plate 41 can be connected more flexibly to achieve docking at various angles, so that a straight line connection, a connection protruding to one side or a broken line connection can be formed as needed, thereby meeting various needs.

[0046] The isolation pile 1 of the fixed part 3 includes an inner tube 18 and an outer tube 19, which are fixedly connected by a reinforcement plate 20, and an arc plate 21 is slidably arranged between the inner tube 18 and the outer tube 19, and the end of the arc plate 21 is fixedly connected to the connection groove 10, and a reinforcement groove 22 is provided on the side wall of the outer tube 19, and the side wall of the arc plate 21 is fixedly connected to the connection groove 10 through an integral plate 23 passing through the reinforcement groove 22. A positioning groove 24 is provided in the connection groove 10, and a lug wheel 25 is eccentrically connected to the positioning groove 24, and the end of the lug wheel 25 passes through the side wall of the outer tube 19 and is located outside the inner tube 18, and an anti-slip strip 26 is fixedly connected to the side wall of the inner tube 18.

[0047] On the basis of the above, through the double-layer cylinder structure of the inner cylinder 18 and the outer cylinder 19, a connecting groove 10 can be rotatably provided outside the cylinder of the isolation pile 1. When the isolation pile 1 is driven into the ground, the position of the connecting groove 10 can be rotated to adapt to the end plate 41 to be subsequently connected, thereby greatly reducing the on-site welding adjustment time (the protruding tongue and groove in the prior art is generally pre-welded or on-site welded outside the isolation pile 1), which can more flexibly adapt to the needs of docking installation, and once driven into the ground, the position of the connecting groove 10 and the cylinder is fixed, and there is no need for complicated fixing means.

[0048] When the end plate 41 is subsequently inserted into the connecting groove 10, since the lug wheel 25 is eccentrically connected, the side surface of the wheel protrudes from the outer end of the positioning groove 24 under normal circumstances. When the end plate 41 passes through the lug wheel 25, it can contact the side surface of the wheel and then move it to make its lower end rotate and tilt up, and then the lug of the lug wheel 25 is pressed against the inner cylinder 18, further fixing the relative position of the connecting groove 10 and the inner cylinder 18. At the same time, when the end plate 41 lifts the lug wheel 25 to make it rotate, the lug wheel 25 also acts on the plug plate 43 of the end plate 41 outward, so that the contact surface of the outer side of the plug plate 43 and the connecting groove 10 is more closely fitted, thereby strengthening the airtightness and firmness of the isolation pile 1 and the end plate 41 and enhancing the water-stopping property. Example 3

[0049] See also Figure 1-7 A T-shaped connecting plate 27 is fixedly connected to the outside of the isolation pile 1 of the support part 2, and the connecting plate group 5 includes a plurality of double-headed plates 28, the ends of the double-headed plates 28 are side opening tubes 29, and the double-headed plates 28 are connected to each other through the openings of the side opening tubes 29, and the T-shaped connecting plate 27 is plugged into the side opening tubes 29 of the double-headed plates 28.

[0050] The connecting plate group 5 adopts the method of double-headed plates 28 connected to each other, which can make the isolation piles 1 in the supporting part 2 connected and tied to each other in a straight line, so that the force is simpler and more direct, and the supporting capacity can be enhanced to effectively prevent tilting; the side opening tubes 29 are connected to each other with good airtightness and water-stopping properties, and the docking space is large, which has a certain guiding effect, and is convenient for early docking and driving.

Claims

1. A protective device for preventing surrounding buildings from settling due to deep foundation pit excavation, comprising isolation piles (1) and isolation plates, characterized in that: The isolation piles (1) are evenly provided with a plurality of support parts (2) and fixed parts (3) distributed thereon, the support parts (2) being connected to both ends of the fixed parts (3), the isolation piles (1) of the support parts (2) being distributed in a Y shape, the isolation piles (1) of the fixed parts (3) being distributed in a closed geometric shape, retaining plate groups (4) being installed between the isolation piles (1) of the fixed parts (3), connecting plate groups (5) being installed between the isolation piles (1) of the support parts (2), the bottoms of the isolation piles (1) being commonly connected to a bottom connector (6), the tops of the isolation piles (1) being commonly connected to a top connector (7), the top connector (7) being located between the deep foundation pit and the surrounding buildings to be protected, one side of the top connector (7) being provided with a docking body (8), and the other side of the top connector (7) being provided with a balancing body (9), the docking body (8) being used to be connected to the foundation of the surrounding buildings to be protected; The isolation piles (1) of the fixing part (3) are distributed in a symmetrical closed geometric pattern, and the retaining plate group (4) between the isolation piles (1) of the fixing part (3) protrudes toward one side of the surrounding buildings to be protected; The outer side of the isolation pile (1) of the fixing part (3) is fixedly connected with a connecting groove (10); the retaining plate group (4) comprises an end plate (41) and a standard plate (42); one end of the end plate (41) is fixedly connected with a plug plate (43); the plug plate (43) is plugged into the connecting groove (10); one end of the standard plate (42) is fixedly connected with a column (44); a side wall of the column (44) is provided with a plurality of selection grooves (45); the selection grooves (45) are plugged into the plate body of the end plate (41) or other standard plates (42); The isolation pile (1) of the fixed part (3) comprises an inner tube (18) and an outer tube (19), the inner tube (18) and the outer tube (19) being fixedly connected via a reinforcing plate (20), an arc plate (21) being slidably arranged between the inner tube (18) and the outer tube (19), an end of the arc plate (21) being fixedly connected to a connecting groove (10), a reinforcing groove (22) being provided on a side wall of the outer tube (19), and a side wall of the arc plate (21) being fixedly connected to the connecting groove (10) via an integral plate (23) passing through the reinforcing groove (22); A positioning groove (24) is provided in the connection groove (10), and a lug wheel (25) is eccentrically rotatably connected in the positioning groove (24). The end of the lug wheel (25) passes through the side wall of the outer cylinder (19) and is located outside the inner cylinder (18). The side wall of the inner cylinder (18) is fixedly connected with an anti-slip strip (26).

2. A protective device for preventing surrounding buildings from settling due to deep foundation pit excavation according to claim 1, characterized in that: The retaining plate group (4) further comprises a column monomer (46), a plurality of monomer grooves (47) being evenly formed on the side wall of the column monomer (46), and the column monomer (46) is used for connecting the standard plate (42) or the end plate (41).

3. A protective device for preventing surrounding buildings from settling due to deep foundation pit excavation according to claim 1, characterized in that: The isolation piles (1) are steel pipe piles, and the isolation plates are steel sheet piles.

4. The protective device for preventing surrounding buildings from settling due to deep foundation pit excavation according to claim 1, characterized in that: A T-shaped connecting plate (27) is fixedly connected to the outside of the isolation pile (1) of the support portion (2), the connecting plate group (5) comprises a plurality of double-end plates (28), the ends of the double-end plates (28) are side opening tubes (29), the double-end plates (28) are connected to each other through the openings of the side opening tubes (29), and the T-shaped connecting plate (27) is plugged into the side opening tubes (29) of the double-end plates (28).

5. The protective device for preventing surrounding buildings from settling due to deep foundation pit excavation according to claim 1, characterized in that: The bottom connector (6) is a concrete member, and the top connector (7) is a concrete member or a steel member.

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