Anti-collapse device suitable for underground diaphragm wall empty pile backfilling and construction method

Abstract

The invention discloses an anti-collapse device suitable for empty pile backfilling of an underground diaphragm wall. The anti-collapse device comprises a lateral fence and a limiting frame. The lateral fences are vertically arranged in the empty piles; the width direction of the lateral fences is perpendicular to the extending direction of the underground diaphragm wall. The lateral fences are arranged at intervals in the extending direction of the underground diaphragm wall. The bottom of the lateral fence is inserted into an I-shaped steel joint in a reinforcement cage of the underground diaphragm wall and is in limiting fit with the I-shaped steel joint in the extending direction of the underground diaphragm wall; the limiting frame is provided with a plurality of limiting parts at intervals in the length direction. The spacing of the limiting parts is matched with that of the lateral fences; the limiting part is arranged on the periphery of the top of the lateral fence in a sleeving mode so as to limit displacement of the lateral fence in the horizontal direction. The invention further discloses an anti-collapse construction method suitable for underground diaphragm wall empty pile backfilling, by adopting the anti-collapse device, the collapse problem easily occurring during earthwork backfilling of the empty pile part is effectively prevented, and the construction safety and the pile forming quality of the underground diaphragm wall are remarkably improved.

Description

Technical Field

[0001] The present invention relates to construction technology, and in particular to an anti-collapse device and construction method suitable for backfilling the empty piles of diaphragm walls. Background Art

[0002] Due to the presence of many empty pile parts in the diaphragm wall, in order to prevent the lateral un-reinforced area from collapsing, it is necessary to backfill the soil in the empty pile part in time after the initial setting of this section of the wall. However, in order to meet the requirements of inspection and monitoring before the foundation pit excavation, devices such as sonic logging tubes, inclinometers, and grouting tubes need to be embedded to the ground surface, which makes it impossible to effectively compact the backfill soil in the empty pile part, resulting in the backfill soil being relatively loose. This loose backfill soil is extremely prone to collapse during the construction of adjacent diaphragm walls, seriously affecting the construction safety and quality of adjacent walls.

[0003] During the grooving process of adjacent diaphragm walls, if the surrounding soil collapses, it will cause the void under the construction road, posing a risk of road surface collapse, and may even lead to major safety hazards such as the tilting or collapse of construction machinery. More seriously, if a collapse occurs after the reinforcement cage of the adjacent wall is in place or during the concrete pouring process, it will cause a series of quality defects and safety problems in the diaphragm wall, such as insufficient pile length, broken piles, and water seepage. This not only significantly increases the difficulty and cost of subsequent treatment, but also seriously delays the overall project duration, bringing additional construction safety risks. Summary of the Invention

[0004] The main technical problem to be solved by the present invention is to provide an anti-collapse device and / or construction method suitable for backfilling the empty piles of diaphragm walls, which can prevent the lateral collapse of the backfill soil in the empty pile part, thereby improving the construction safety and pile forming quality of the diaphragm wall.

[0005] To solve the above technical problems, the present invention provides an anti-collapse device suitable for backfilling the empty piles of diaphragm walls, including a lateral enclosure and a limiting frame;

[0006] The lateral enclosure is vertically arranged in the empty pile; the width direction of the lateral enclosure is perpendicular to the extension direction of the diaphragm wall, so as to be configured to laterally support the backfill soil in the empty pile; the lateral enclosures are arranged at intervals along the extension direction of the diaphragm wall; the bottom of the lateral enclosure is inserted into the I-beam joint in the diaphragm wall reinforcement cage, and is in limit cooperation with the I-beam joint along the extension direction of the diaphragm wall;

[0007] The limiting frame is provided with a plurality of limiting parts at intervals along the length direction; the setting interval of the limiting parts matches that of the lateral enclosure; the limiting parts are sleeved on the outer periphery of the top of the lateral enclosure, so as to be configured to limit the lateral displacement of the lateral enclosure in the horizontal direction.

[0008] In a preferred embodiment, a limiting ear is further provided at the top of the lateral enclosure; the limiting ear extends from the surface of the lateral enclosure and is hung on the limiting part, and is in limiting cooperation with the limiting frame in the vertical direction.

[0009] In a preferred embodiment, a docking groove is provided at the bottom of the lateral enclosure in the width direction; the docking groove is constructed by two oppositely arranged plate bodies; the docking groove is sleeved on the top of the web of the I-beam joint.

[0010] In a preferred embodiment, a strengthening part is provided on the lateral enclosure in the height direction.

[0011] In a preferred embodiment, the strengthening part is one or several sections of I-beams; the web of the strengthening part is perpendicular to the width direction of the lateral enclosure.

[0012] In a preferred embodiment, the width of the lateral enclosure is equal to the width of the I-beam joint.

[0013] In a preferred embodiment, the lateral enclosure is one section of I-beam; the height direction of the web of the lateral enclosure is perpendicular to the extension direction of the diaphragm wall.

[0014] In a preferred embodiment, the limiting frame is detachably connected at the limiting part.

[0015] The present invention also provides an anti-collapse construction method applicable to the backfilling of the empty pile of the diaphragm wall, adopting the anti-collapse device described above. The method includes the following steps:

[0016] Step 1: After the first diaphragm wall is grooved, connect the bottom of the lateral enclosure to the I-beam joint in the steel reinforcement cage and lower them together; after the steel reinforcement cage enters the groove, install the limiting frame between adjacent lateral enclosures, and then pour the first diaphragm wall;

[0017] Step 2: After the first diaphragm wall starts to set, backfill the empty pile soil above; after the strength reaches the standard, excavate the adjacent second diaphragm wall;

[0018] Step 3: Repeat Step 1 and Step 2 to complete the pouring of the remaining diaphragm walls and the backfilling of the soil in the empty pile parts.

[0019] In a preferred embodiment, in Step 3, it further includes removing the limiting frame or the lateral enclosure;

[0020] The limiting frame needs to be removed after the limiting frames on both sides of it have been installed; the lateral enclosure needs to be removed after the construction of the diaphragm walls on both sides of it is completed.

[0021] Compared with the prior art, the technical solution of the present invention has the following beneficial effects:

[0022] The device provided by the present invention effectively prevents the lateral collapse of the backfill soil in the empty pile part through the lateral enclosures vertically installed at the top of the diaphragm wall; by connecting each group of adjacent lateral enclosures through the limit frame at the top, the displacement of the lateral enclosures in the horizontal direction is restricted, ensuring a stable working attitude. Thus, through the coordinated cooperation of the lateral enclosures and the limit frame, the device effectively prevents the collapse problem that is likely to occur when backfilling the soil in the empty pile part, significantly improving the construction safety and pile-forming quality of the diaphragm wall. In addition, the device has a simple structure, reliable connection, convenient disassembly and assembly, facilitating turnover transportation and construction operation. Moreover, most of the components of the device are made of common profiled steel components, with a wide range of materials and easy to manufacture. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a three-dimensional schematic diagram of the anti-collapse device provided in the embodiment of the present invention arranged at the top of the diaphragm wall;

[0024] Figure 2 It is a three-dimensional schematic diagram of the anti-collapse device provided in the embodiment of the present invention and the I-beam joint;

[0025] Figure 3 It is a connection schematic diagram of the anti-collapse device provided in the embodiment of the present invention at the limiting part;

[0026] Figure 4 It is a schematic diagram of the connection part of the anti-collapse device provided in the embodiment of the present invention and the I-beam joint (i.e., the schematic diagram of the setting of the docking groove);

[0027] Figure 5 It is a construction process schematic diagram of the anti-collapse construction method provided in the embodiment of the present invention.

[0028] The labels in the figure are: 1 - lateral enclosure, 101 - limit ear, 102 - strengthening part, 103 - docking groove, 2 - limit frame, 201 - limiting part, 3 - diaphragm wall, 301 - steel cage, 302 - I-beam joint. DETAILED DESCRIPTION OF THE INVENTION

[0029] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0030] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "top / bottom end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "provided with", "sheathed / connected", "connected", etc. should be understood in a broad sense. For example, "connected" can be a wall-mounted connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] As Figures 1 to 5 shown, an anti-collapse device applicable to the backfilling of the empty pile of the diaphragm wall is provided in an embodiment of the present invention, which includes a lateral enclosure 1 and a limiting frame 2. As Figure 1 shown, generally speaking, the lateral enclosure 1 is vertically installed in the empty pile at the top of the diaphragm wall 3 and is arranged at intervals along the extension direction of the diaphragm wall 3. The limiting frame 2 is arranged at the top of the empty pile. By connecting and multi-directionally limiting several adjacent lateral enclosures 1, the lateral enclosure 1 is maintained in a stable working posture.

[0033] In this embodiment, the lateral enclosure 1 is made of a section of I-beam. As Figure 1 、 Figure 3 shown, in the width direction of the lateral enclosure 1, that is, the web height direction of the I-beam, it is perpendicular to the extension direction of the diaphragm wall 3 to form a lateral support for the backfill soil in the empty pile. The limiting frame 2 is a rigid space structure assembled by several I-beams. As shown in the figure, several circumferentially closed limiting parts 201 are arranged at intervals along the length direction of the limiting frame 2, and the setting interval is matched with the installation interval of the lateral enclosure 1. The limiting part 201 is sleeved on the outer periphery of the top of the lateral enclosure 1 to limit the lateral displacement of the lateral enclosure 1 in the horizontal direction. Preferably, a limiting ear 101 is further arranged at the top of the lateral enclosure 1. The limiting ear 101 extends from the flange surface of the I-beam and is hung on the limiting part 201 to perform vertical limiting cooperation with the limiting frame 2.

[0034] It should be noted that the steel cage 301 of the diaphragm wall 3 is provided with an I-beam joint 302 at intervals, which belongs to the common prior art. As Figure 4 shown, on each of the two bottom surfaces of the web of the lateral retaining wall 1, a plate body is welded. The two plate bodies are arranged oppositely and extend below the bottom of the web to form a docking groove 103. In this way, when the docking groove 103 is sleeved and inserted onto the web of the lower I-beam joint 302 from the top, the lateral retaining wall 1 can be in limit cooperation with the I-beam joint 302 along the extension direction of the diaphragm wall 3, avoiding slippage at the bottom due to lateral soil pressure. This plug-in connection also has an advantage that when the lateral retaining wall 1 needs to be withdrawn from the working position, the construction workers only need to lift it upward, which is quick to operate and convenient for turnover.

[0035] So far, through the limit at the top with the limit frame 2 and the limit at the bottom with the I-beam joint 302, the lateral retaining wall 1 has a stable working attitude in the extension direction of the diaphragm wall 3. Further, as Figure 2 、 Figure 3 shown, the lateral retaining wall 1 is also provided with a strengthening part 102 in the height direction. In this embodiment, the strengthening part 102 is one or several sections of I-beams vertically welded on the web of the lateral retaining wall 1, and the excellent bending resistance of the I-beams is used to improve the lateral stiffness. Therefore, the web of the strengthening part 102 should be perpendicular to the width direction of the lateral retaining wall 1, in other words, the web of the strengthening part 102 is parallel to the extension direction of the diaphragm wall 3. Preferably, in this embodiment, the strengthening part 102 is arranged throughout the height of the lateral retaining wall 1.

[0036] Regarding the device, it is also necessary to additionally explain: to achieve a better retaining effect, the width of the lateral retaining wall 1 is the same as that of the lower I-beam joint 302; the limit frame 2 adopts a detachable connection at the node of the limit part 201, so as to facilitate the individual installation or disassembly of any section during construction; in actual construction, the limit frame 2 can be stabilized on the top of the lateral retaining wall 1 by spot welding or by setting a temporary support at the bottom of the limit part 201, or auxiliary fixing measures outside the system can also be adopted to not rely on the lateral retaining wall 1.

[0037] The embodiment of the present invention also provides an anti-collapse construction method applicable to the backfilling of the empty pile of the diaphragm wall, which adopts the anti-collapse device provided by the embodiment of the present invention. As Figure 5 shown, the method includes the following steps:

[0038] Step 1: After the trench of the No. 1 diaphragm wall is formed, connect the lateral enclosure 1 to the I-beam joint 302 in the steel reinforcement cage 301 and lower them together. After the steel reinforcement cage 301 is placed into the trench, install the limit frame 2 between two adjacent groups of lateral enclosures 1. After installation, pour the No. 1 diaphragm wall, and backfill the soil in the empty pile part above the No. 1 diaphragm wall after initial setting. After the strength meets the requirements, excavate the No. 2 diaphragm wall.

[0039] Step 2: After the trench of the No. 2 diaphragm wall is formed, place the steel reinforcement cage 301 and the anti-collapse device, pour the diaphragm wall, backfill the soil in the empty pile part, and excavate the No. 3 diaphragm wall according to the process of Step 1. In this embodiment, the No. 3 diaphragm wall is adjacent to the No. 1. In other embodiments, the No. 3 diaphragm wall may be adjacent to the No. 2.

[0040] Step 3: After the trench of the No. 3 diaphragm wall is formed, connect the lateral enclosure 1 to the I-beam joint 302 in the steel reinforcement cage 301 and place them into the trench together. After the steel reinforcement cage 301 is placed into the trench, install the limit frame 2 between two adjacent groups of lateral enclosures 1. After installation, the limit frame 2 above the No. 1 diaphragm wall can be removed. Then pour the No. 3 diaphragm wall, and backfill the soil in the empty pile part above the No. 3 diaphragm wall after initial setting; after the strength meets the requirements, excavate the No. 4 diaphragm wall. In this embodiment, the No. 4 diaphragm wall is adjacent to the No. 2.

[0041] Step 4: After the trench of the No. 4 diaphragm wall is formed, connect the lateral enclosure 1 to the I-beam joint 302 in the steel reinforcement cage 301 and place them into the trench together. After the steel reinforcement cage 301 is placed into the trench, install the limit frame 2 between two adjacent groups of lateral enclosures 1. After installation, the limit frame 2 above the No. 2 diaphragm wall, and the lateral enclosure 1 between the backfilled soil of the No. 1 and No. 2 diaphragm walls can be removed. Pour the No. 4 diaphragm wall, and backfill the soil in the empty pile part above the No. 4 diaphragm wall after initial setting; after the strength meets the requirements, excavate the next diaphragm wall.

[0042] Repeat Step 1 to Step 4 to complete the pouring of the remaining diaphragm walls and the backfilling of the soil in the empty pile parts. It should be understood that if there are enough anti-collapse devices, then in Step 3 and Step 4, the removal of the lateral enclosure 1 and the limit frame 2 is not necessary, and they can be removed uniformly after the overall backfilling of the empty piles. Therefore, repeating Step 1, or repeating Step 1 and Step 2, can also successfully complete the construction of the diaphragm wall. The above No. 1, No. 2, No. 3, and No. 4 diaphragm walls can also be called the first diaphragm wall, the second diaphragm wall, the third diaphragm wall, the fourth diaphragm wall, and so on.

[0043] Combined with the above construction steps, the demolition of the anti-collapse device needs to meet the following conditions: (1) The limit frame 2 can be demolished only after the limit frames 2 on both sides are installed. (2) The lateral enclosure 1 can be demolished only after the diaphragm walls on both sides are constructed.

[0044] The device is also applicable to the skip construction method of diaphragm walls, that is, each excavated wall is regarded as the above-mentioned No. 1 wall, and the adjacent diaphragm walls are No. 2 and No. 3 walls, and so on. This will not be elaborated in this article.

[0045] In summary, the anti-collapse device effectively prevents the lateral collapse of the backfill soil in the empty pile part through the lateral enclosure 1 vertically installed on the top of the diaphragm wall 3; by connecting each group of adjacent lateral enclosures 1 through the limit frame 2 at the top, the lateral displacement of the lateral enclosure 1 in the horizontal direction is restricted, ensuring a stable working posture. Thus, through the coordinated cooperation of the lateral enclosure 1 and the limit frame 2, the device effectively prevents the collapse problem that is likely to occur when backfilling the soil in the empty pile part, significantly improving the construction safety and pile-forming quality of the diaphragm wall. In addition, the device has a simple structure, reliable connection, convenient disassembly and assembly, and is convenient for turnover transportation and construction operation. Moreover, most of the components of the device are made of common steel sections, with wide material sources and convenient production.

[0046] The above is only the preferred specific implementation mode of the present invention, and does not limit the patent scope of the present invention. Any technical equivalent transformation made using the content of the specification of the present invention belongs to the protection scope of the present invention.

Claims

1. An anti-collapse device applicable to the backfill of the empty pile of the diaphragm wall, characterized in that: It includes a lateral retaining wall and a limiting frame; The lateral retaining wall is vertically arranged in the empty pile; the width direction of the lateral retaining wall is perpendicular to the extension direction of the diaphragm wall, so as to be configured to laterally support the backfill soil in the empty pile; the lateral retaining walls are arranged at intervals along the extension direction of the diaphragm wall; the bottom of the lateral retaining wall is inserted into the I-beam joint in the diaphragm wall steel cage, and is in limiting cooperation with the I-beam joint along the extension direction of the diaphragm wall; The limiting frame is provided with a number of limiting parts at intervals along the length direction; the setting interval of the limiting parts matches that of the lateral retaining wall; the limiting parts are sleeved on the outer periphery of the top of the lateral retaining wall, so as to be configured to limit the lateral displacement of the lateral retaining wall in the horizontal direction.

2. The anti-collapse device applicable to the backfilling of the empty pile of the diaphragm wall according to claim 1, characterized in that: The lateral retaining wall is also provided with limiting ears at the top; the limiting ears extend out from the surface of the lateral retaining wall and are hung on the limiting parts, and are in limiting cooperation with the limiting frame in the vertical direction.

3. The anti-collapse device applicable to the backfill of the empty pile of the diaphragm wall according to claim 1, wherein: The lateral retaining wall is provided with a docking groove along the width direction at the bottom; the docking groove is constructed by two oppositely arranged plate bodies; the docking groove is sleeved on the top of the web of the I-beam joint.

4. The anti-collapse device applicable to the backfilling of the empty pile of the diaphragm wall according to claim 1, wherein: The lateral retaining wall is provided with a strengthening part along the height direction.

5. The anti-collapse device applicable to the backfilling of the empty pile of the diaphragm wall according to claim 4, characterized in that: The strengthening part is one or several sections of I-beams; the web of the strengthening part is perpendicular to the width direction of the lateral retaining wall.

6. The anti-collapse device for backfilling the empty pile of the diaphragm wall according to claim 1, wherein: The width of the lateral retaining wall is equal to the width of the I-beam joint.

7. The anti-collapse device applicable to the backfill of the empty pile of the diaphragm wall according to claim 1, characterized in that: The lateral retaining wall is one section of I-beam; the height direction of the web of the lateral retaining wall is perpendicular to the extension direction of the diaphragm wall.

8. The anti-collapse device applicable to the backfill of the empty pile of the diaphragm wall according to claim 1, wherein: The limiting frame is detachably connected at the limiting parts.

9. A construction method for preventing collapse applicable to backfilling of the empty pile of the diaphragm wall, using the anti-collapse device described in any one of claims 1 to 8, characterized in that: It includes the following steps: Step 1: After the first diaphragm wall is trenched, connect the bottom of the lateral retaining wall with the I-beam joint in the steel cage and lower them together; after the steel cage is inserted into the trench, install the limiting frame between adjacent lateral retaining walls, and then pour the first diaphragm wall; Step 2: After the first diaphragm wall starts to set, backfill the soil in the upper empty pile; after the strength reaches the standard, excavate the adjacent second diaphragm wall; Step 3: Repeat Step 1 and Step 2 to complete the pouring of the remaining diaphragm walls and the soil backfill in the empty pile parts.

10. A anti-collapse construction method applicable to the backfill of the empty pile of the diaphragm wall according to claim 1: in the said Step 3, it also includes removing the limiting frame or the lateral retaining wall; The limiting frame is removed after the limiting frames on both sides of it are installed; the lateral retaining wall is removed after the diaphragm walls on both sides of it are constructed.

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