Construction method for dismantling ultra-deep large-size underground diaphragm wall in narrow and small space

Abstract

The invention provides a narrow space ultra-deep large-size underground diaphragm wall dismantling construction method which comprises the steps that S1, an underground diaphragm wall is divided into layers, and each layer of the underground diaphragm wall is divided into a plurality of cutting blocks; s2, the two adjacent layers of underground diaphragm walls are divided through a concrete core drilling machine; the method comprises the steps of (S1) cutting a first cutting block through row holes distributed in an inverted splayed mode, (S4) synchronously conducting row hole construction from the two sides of the first cutting block so as to conduct corresponding cutting block segmentation, and (S5) repeating the steps (S2)-(S4) to complete dismantling of the whole underground diaphragm wall. The method is mainly suitable for dismantling the underground diaphragm wall, and is particularly suitable for construction environments with narrow space and single side interfered by a structural outer wall. By using a narrow-space ultra-deep large-volume underground diaphragm wall dismantling construction technology and adopting first block inclined surface cutting, smooth hoisting of an underground diaphragm wall dismantling block body is ensured, the construction time is shortened, and the construction cost is favorably saved.

Description

Technical Field

[0001] The present invention belongs to the technical field of subway construction, and particularly relates to a construction method for demolishing a super-deep and large-volume diaphragm wall in a narrow space. Background Art

[0002] During the construction of a subway station, in order not to affect the construction of surrounding buildings, the main structure and the accessory structure of the station are constructed separately, and both adopt enclosure structure measures such as diaphragm walls or cast-in-place concrete piles for sealing and isolation. After the construction of the main structure and the accessory structure of the subway station is completed, it is necessary to demolish the diaphragm wall outside the station to connect the main structure of the station and the accessory main structure together.

[0003] When demolishing the diaphragm wall, due to the relatively deep buried depth of the structure and the completion of the construction of one-sided or both-sided structures, the demolition space is narrow. The existing technology is to use a breaker or a manual pneumatic pick for construction. This construction method takes a long time, requires a large amount of labor, affects the construction period, and has potential safety hazards.

[0004] Therefore, it is necessary to provide an improved technical solution to address the deficiencies of the above-mentioned existing technologies. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies in the above-mentioned existing technologies. The present invention provides a construction method for demolishing a super-deep and large-volume diaphragm wall in a narrow space.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] A construction method for demolishing a super-deep and large-volume diaphragm wall in a narrow space, comprising the following steps:

[0008] Step S1: Layout the diaphragm wall by measuring and setting out, divide the diaphragm wall into layers, and divide each layer of the diaphragm wall into multiple cutting blocks;

[0009] Step S2: Use a concrete core drilling machine to drill a row of overlapping holes from the outside to the inside along the thickness direction of the diaphragm wall to divide adjacent two layers of the diaphragm wall;

[0010] Step S3: The first cutting block of the same layer of the diaphragm wall is cut through holes distributed in an inverted V shape, vertically drilled lifting holes from the top down along the height direction of the diaphragm wall, install a lifting tool in the lifting holes, and then lift and transfer the first piece of the diaphragm wall upward;

[0011] Step S4: Synchronously carry out hole construction on both sides of the first cutting block to divide the corresponding cutting blocks, use a lifting tool to lift and transport the cut cutting blocks, and repeat the cutting along the same layer of the diaphragm wall until all the diaphragm walls of the same layer are demolished;

[0012] Step S5. Repeat steps S2 - S4 to complete the demolition of the entire diaphragm wall.

[0013] Preferably, after each cutting block is cut, a placement space corresponding to the structural exterior wall is chiseled above the diaphragm wall, and the jack is placed in the placement space to jack open the cutting block and the structural exterior wall.

[0014] Preferably, after the cutting block is jacked open above, the jack is continuously lowered into the gap between the cutting block and the structural exterior wall until the cutting block and the structural exterior wall are completely separated.

[0015] Preferably, the drilling diameter in the row of holes is 10 cm, and the adjacent drill holes overlap by 1 cm.

[0016] Preferably, during the cutting process, a temporary working platform is erected according to the size and height of the cutting block. The temporary working platform adopts a Z-shaped socketed disc buckle support and is arranged in a double row along the entire length of the wall.

[0017] Preferably, an assembly groove corresponding to the lifting hole is provided in the middle or lower edge of the cutting block, and the lifting tool extends downward through the lifting hole and is clamped in the assembly groove.

[0018] Preferably, the lifting tool includes:

[0019] a casing, the casing is adapted to the inner diameter of the lifting hole, and a stud is threadedly assembled inside the casing;

[0020] a support plate, a plurality of the support plates are radially assembled along the lower edge of the casing, and an inclined extrusion surface corresponding to the lower end of the stud is provided inside the support plate to be clamped in the assembly groove after protruding from the casing through the extrusion of the stud.

[0021] Preferably, a frustum-shaped structure corresponding to the support plate is provided at the lower end of the stud, and a lifting ring is provided at the upper end of the stud.

[0022] Preferably, a locking disc is threadedly assembled at the upper end of the casing, and by rotating the locking disc, the two ends of the lifting hole are tightly squeezed in cooperation with the support plate.

[0023] Advantageous effects: This method is mainly applicable to the demolition of diaphragm walls, especially applicable to the construction environment with narrow space and interference from the structural exterior wall on one side.

[0024] By using the construction technology for demolishing super - deep and large - volume diaphragm walls in narrow spaces, with the first - piece inclined cutting method, it ensures the smooth hoisting of the demolished diaphragm wall blocks, reduces the construction time, and is beneficial to saving construction costs. By using a concrete core - drilling machine to form a cutting surface through mutually arranged holes, it ensures safe, environmentally friendly, and rapid construction. By using the construction technology for demolishing super - deep and large - volume diaphragm walls in narrow spaces, and using a jack to separate the blocks, it reduces the generation of sewage slurry, reduces pollution, and protects the environment well. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. Among them:

[0026] Figure 1 is a flowchart of the method for demolishing a diaphragm wall in a specific embodiment provided by the present invention;

[0027] Figure 2 is a structural schematic diagram of a lifting appliance in a specific embodiment provided by the present invention.

[0028] In the figure: 1, casing; 2, stud; 3, lifting ring; 4, locking disc; 5, support plate. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present invention.

[0030] In the description of the present invention, the orientation or positional relationships indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present invention rather than requiring the present invention to be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present invention. The terms "connected" and "coupled" used in the present invention should be understood in a broad sense. For example, they can be fixedly connected or detachably connected; they can be directly connected or indirectly connected through intermediate components. For those of ordinary skill in the art, the specific meanings of the above - mentioned terms can be understood according to specific circumstances.

[0031] The present invention will be described in detail below with reference to the drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0032] As Figure 1-2As shown in the figure, a construction method for demolishing a super-deep and large-volume diaphragm wall in a narrow space includes the following steps:

[0033] Step S1: According to the design drawing of the retaining structure, use a total station to set out the diaphragm wall. Set out the diaphragm wall by measuring and setting out the line, divide the diaphragm wall into layers, determine the position of the I-beam of each diaphragm wall and the mechanical standing position, divide each layer of the diaphragm wall into multiple cutting blocks, determine the size of the diaphragm wall blocks according to the position of the I-beam, the position of the outer structural wall, and the on-site construction environment, and position the drilling holes.

[0034] Step S2: First, delimit the size of the diaphragm wall demolition block. Drill holes using a concrete core drilling machine. Use the concrete core drilling machine to drill a row of overlapping holes from the outside to the inside along the thickness direction of the diaphragm wall to divide the adjacent two layers of the diaphragm wall; the diameter of the holes forming the row of holes is 10 cm, and the adjacent holes overlap by 1 cm. Remove the diaphragm wall blocks through the row of holes to achieve the purpose of demolishing the diaphragm wall. During drilling, strictly control the hole depth to prevent damage to the structural exterior wall.

[0035] Step S3: The first cutting block of the same layer of the diaphragm wall is cut through the row of holes distributed in an inverted V shape. The first cutting surface is an inclined inverted V shape, with a large upper opening and a small lower opening, so as to facilitate the upward lifting of the first cutting block. Drill vertical lifting holes from the top surface downward along the height direction of the diaphragm wall. After installing the lifting tool in the lifting holes, lift the first diaphragm wall upward and transfer it, so that it can be quickly lifted and transported, reducing the space occupied by lifting. Calculate the weight according to the set diaphragm wall block size, and then select the required crane and lifting tool according to the weight of the lifted object and the on-site construction environment. During lifting, use a cable to manually tow to prevent the lifted object from swinging during separation. After the demolition is completed, the concrete block is slowly pulled out by the crane, and then vertically lifted to the ground; use a flatbed truck to promptly remove the concrete block. During the lifting process of the concrete block, all concrete blocks are first vertically lifted to the ground and then transported horizontally.

[0036] Step S4: Select the middle part of the same layer of the diaphragm wall for the first cutting block. Synchronously carry out row hole construction on both sides of the first cutting block to divide the corresponding cutting blocks. Synchronous cutting on both sides can greatly improve the construction efficiency. After any one side of the cutting block is cut, it is randomly lifted. Independently lift the cut cutting block through the lifting tool, and repeat the cutting along the same layer of the diaphragm wall until all the diaphragm walls of the same layer are demolished;

[0037] Step S5: Repeat Step S2 - Step S4 to complete the demolition of the entire diaphragm wall.

[0038] In an alternative embodiment, after any cutting block is cut, a placement space corresponding to the structural exterior wall is chiseled above the diaphragm wall. The placement space is a strip-shaped groove located on one side of the structural exterior wall, with one end extending to the side of the cutting block close to the structural exterior wall. The length of the strip-shaped groove is not greater than two-thirds of the thickness of the diaphragm wall. A jack is placed in the placement space, so that a jacking force can be applied to the cutting block of the diaphragm wall through the jack, and then the cutting block and the structural exterior wall can be jacked apart by the jack.

[0039] Since the jacking stroke of the jack is limited, it is necessary to determine whether to further jack through the jack according to the jacked state of the cutting block. Specifically, a gap will be formed between the cutting block and the structural exterior wall after the upper part of the cutting block is jacked open. At this time, the jack is continuously lowered into the gap, and the jacking operation is repeated until the cutting block and the structural exterior wall are completely separated.

[0040] Furthermore, during the cutting process, a temporary working platform is erected according to the size and height of the cutting block. If the height of the divided block is too high, a temporary working platform needs to be erected. The temporary working platform adopts a Z-shaped socketed disc buckle support and is arranged in a double row along the entire length of the wall.

[0041] In an alternative embodiment, an assembly groove corresponding to the lifting hole is provided in the middle or lower edge of the cutting block. The assembly groove is formed by drilling or grooving. The lifting tool extends downward through the lifting hole and is clamped in the assembly groove, so that the lifting stability of the cutting block can be ensured in a small space. Specifically, the lifting tool includes a sleeve 1 and a support plate 5. The inner diameter of the sleeve 1 is adapted to the inner diameter of the lifting hole, and the length of the sleeve 1 is adapted to the length of the lifting hole. A stud 2 is threadedly assembled inside the sleeve 1. The lower end of the stud 2 extends into the sleeve 1 and the upper end extends out of the sleeve 1 for connecting the lifting equipment. A plurality of support plates 5 are radially assembled along the lower edge of the sleeve 1. In this embodiment, the support plate 5 is a metal plate. A strip-shaped hole corresponding to the support plate 5 is provided in the sleeve 1. The number of support plates 5 is 3. A baffle corresponding to the strip-shaped hole is provided on the inner side of the support plate 5 to prevent the support plate 5 from coming out. An inclined extrusion surface corresponding to the lower end of the stud 2 is provided on the inner side of the support plate 5. Under the threaded assembly of the stud 2, the stud 2 rotates downward and extrudes the support plate 5 outward through the inclined extrusion surface, so that the support plate 5 can extend out of the sleeve 1 under the extrusion state and be clamped on the top of the assembly groove, thereby forming a limit for lifting the cutting block. Preferably, two lifting tools are provided on the same cutting block to ensure the lifting stability.

[0042] In this embodiment, a frustum-shaped structure corresponding to the support plate 5 is provided at the lower end of the stud 2. The axial length of the frustum-shaped structure is greater than the length of the support plate 5. The inclination of the outer wall of the frustum is adapted to the inclined extrusion surface, so as to ensure the radial force of the support plate 5. A lifting ring 3 is provided at the upper end of the stud 2, and the lifting ring 3 is fixed to the stud 2 by welding.

[0043] To ensure the limiting ability for the cutting blocks, a locking disc 4 is threadedly assembled at the upper end of the casing 1. The diameter of the locking disc 4 is larger than the hoisting hole. By rotating the locking disc 4 to cooperate with the support plate 5 to tightly squeeze both ends of the hoisting hole, a pre-tightening force is generated on the cutting blocks, avoiding loosening of the cutting blocks during hoisting and improving the stability of hoisting.

[0044] Furthermore, a hemispherical plugging plate is provided at the bottom of the casing 1, which is convenient for the casing 1 to penetrate into the hoisting hole.

[0045] In summary, the present method provides a construction technology for demolishing a diaphragm wall in a narrow space. This method can complete the construction of demolishing the diaphragm wall while ensuring that it is not affected by the structure.

[0046] First, use a concrete core drill to vertically and horizontally drill a row of overlapping holes from the outer side of the diaphragm wall inward along the thickness direction of the diaphragm wall to form a row of holes. The row of holes divides the diaphragm wall into independent cutting blocks. The first cutting block is trapezoidal in reverse. Vertically drill a hoisting hole from the top surface of the diaphragm wall downward along the height direction of the diaphragm wall. Pass the lifting tool through the hoisting hole, and then hoist and transfer the disconnected diaphragm wall.

[0047] For the diaphragm wall that is closely attached to and severely adhered to the outer wall of the structure, also use a concrete core drill to vertically and horizontally drill a row of overlapping holes from the outer side of the diaphragm wall inward along the thickness direction of the diaphragm wall to form a row of hole cutting surfaces. Then, manually chisel a gap above the area where the outer wall of the structure is closely attached to the diaphragm wall. Place the jack in the gap and apply pressure to separate the outer wall of the structure from the diaphragm wall. After separation, use non-destructive static cutting or a row of holes to disconnect the diaphragm wall and hoist and transfer it.

[0048] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention are within the scope of protection of the pending claims of the present invention.

Claims

1. A construction method for demolishing a super-deep and large-volume diaphragm wall in a narrow space, characterized in that, It includes the following steps: Step S1: Layout the diaphragm wall by measuring and setting out the line, divide the diaphragm wall into layers, and divide each layer of the diaphragm wall into multiple cutting blocks; Step S2: Use a concrete core drill to drill a row of overlapping holes from the outside to the inside along the thickness direction of the diaphragm wall to divide the adjacent two layers of the diaphragm wall; Step S3: The first cutting block of the same layer of the diaphragm wall is cut by the holes distributed in an inverted V shape. Vertically drilled lifting holes are drilled downward from the top surface along the height direction of the diaphragm wall. After installing the lifting tool in the lifting holes, the first piece of the diaphragm wall is lifted and transported upward; Step S4: The hole construction is carried out synchronously from both sides of the first cutting block to carry out the corresponding cutting block division. The cut cutting blocks are lifted by the lifting tool, and the cutting is repeated along the same layer of the diaphragm wall until all the diaphragm walls of the same layer are demolished; Step S5: Repeat Step S2 - Step S4 to complete the demolition of the entire diaphragm wall.

2. The construction method for demolishing an ultra-deep and large-volume diaphragm wall in a narrow space according to claim 1, wherein After any cutting block is cut, a placement space for the corresponding structural exterior wall is chiseled out above the diaphragm wall, a jack is placed in the placement space, and the cutting block and the structural exterior wall are jacked open by the jack.

3. The construction method for demolishing a super-deep large-volume diaphragm wall in a narrow space according to claim 2, wherein After the cutting block is jacked open above, the jack is continuously lowered into the gap between the cutting block and the structural exterior wall until the cutting block and the structural exterior wall are completely separated.

4. The construction method for demolishing an ultra-deep large-volume diaphragm wall in a narrow space according to claim 1, characterized in that, The drilling diameter in the holes is 10 cm, and the adjacent drill holes are overlapped by 1 cm.

5. The construction method for demolishing a super-deep and large-volume diaphragm wall in a narrow space according to claim 1, wherein, During the cutting process, a temporary working platform is erected according to the size and height of the cutting block. The temporary working platform adopts a Z-shaped socketed disc support and is arranged in a double row along the entire length of the wall.

6. The construction method for demolishing a super-deep and large-volume diaphragm wall in a narrow space according to claim 1, wherein An assembly groove corresponding to the lifting hole is opened in the middle or the lower edge of the cutting block, and the lifting tool extends downward through the lifting hole and is clamped in the assembly groove.

7. The construction method for demolishing a super-deep and large-volume diaphragm wall in a narrow space according to claim 6, characterized in that, The lifting tool includes: A sleeve, the sleeve is adapted to the inner diameter of the lifting hole, and a stud is threadedly assembled inside the sleeve; Support plates, a plurality of the support plates are radially assembled at the lower edge of the sleeve, and an inclined extrusion surface corresponding to the lower end of the stud is provided inside the support plate to be clamped in the assembly groove after protruding from the sleeve through the extrusion of the stud.

8. The construction method for demolishing an ultra-deep large-volume diaphragm wall in a narrow space according to claim 7, wherein A frustum-shaped structure corresponding to the support plate is provided at the lower end of the stud, and a lifting ring is provided at the upper end of the stud.

9. The construction method for demolishing a super-deep and large-volume diaphragm wall in a narrow space according to claim 7, characterized in that, A locking disc is threadedly assembled at the upper end of the sleeve, and the locking disc is rotated to cooperate with the support plate to tightly squeeze both ends of the lifting hole.

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