Construction method for dismantling concrete sealing wall of ultra-deep foundation pit

Abstract

The present invention relates to a method for demolishing a concrete sealing wall in an ultra-deep foundation pit, comprising the following steps: processing and construction of the hoisting ground, dividing a partition line of the sealing wall to be demolished on the sealing wall to be demolished, setting up a wastewater collection tank, erecting a temporary passage scaffolding system, cutting and construction of the concrete sealing wall to be demolished, and hoisting of the cutting blocks of the sealing wall. The beneficial effects of the present invention are as follows: by providing a double-layer steel mesh, the hoisting ground road and the guide wall are integrated, thereby greatly improving the bearing capacity of the hoisting ground; providing a safety guardrail, thereby effectively ensuring the safety of construction workers; a rope saw cutting machine can slide on a fixed movable track of the rope saw cutting machine and be fixed by a fixed rod of the rope saw cutting machine; providing a wastewater collection tank to improve the working environment of the construction; providing a bottom tray of the sealing wall cutting block on the lower side of the anti-slip base of the sealing wall cutting block, thereby preventing the possibility of slag falling during the hoisting process of the concrete sealing wall cutting block.

Description

Technical Field

[0001] The invention relates to a method for dismantling a concrete blocking wall of an ultra-deep foundation pit, belongs to the technical field of foundation pit engineering, and is suitable for dismantling a blocking wall of a foundation pit, and is particularly suitable for dismantling a blocking wall of an ultra-deep foundation pit in a deep space. Background Art

[0002] The development and utilization of underground space has become increasingly widespread, and therefore a deep foundation pit must be excavated before construction. In the southeastern coastal areas, due to the limitations of soft soil conditions, the deep foundation pit must be enclosed when excavating it.

[0003] Reinforced concrete retaining walls have been widely used due to their low cost, ease of construction, high structural rigidity, good integrity, flexible layout, adaptability to various pit shapes, ability to avoid pit displacement caused by loose joints, and safety. While the conventional excavation wall removal method is feasible, it suffers from high noise levels, poor safety, and low efficiency. Furthermore, the excavation wall retaining wall must be removed after the basement slab is poured and the pit structure is stable and secure. Safely and efficiently dismantling the excavation wall retaining wall plays a key role in the project's later construction. Summary of the Invention

[0004] The purpose of the present invention is to overcome the deficiencies in the prior art and provide a method for dismantling a concrete sealing wall in an ultra-deep foundation pit.

[0005] This ultra-deep foundation pit concrete sealing wall demolition construction method includes the following steps:

[0006] Step 1: Treatment and construction of the hoisting ground: mill the original asphalt concrete pavement in the original hoisting ground structure to form slag, mill the upper part of the outer guide wall to the same height as the slag, install pre-buried PVC pipes, pre-buried galvanized pipes and double-layer steel mesh on the slag and outer guide wall, and then pour concrete to form a reinforced concrete pavement;

[0007] Step 2: Draw a dividing line on the wall to be demolished;

[0008] Step 3: Set up a wastewater collection tank at the junction of the concrete blocking wall to be demolished and the reinforced concrete lower panel;

[0009] Step 4: Set up the temporary passage scaffolding system: Build the temporary passage scaffolding and cutting guide fixed frame structure to the required height, install the scaffolding top support spring and scaffolding top support on the top of the scaffolding vertical pole, install the pedestrian passage frame, set the pedestrian passage floor on the bottom surface of the pedestrian passage frame, set the pedestrian passage safety guardrail on the side of the pedestrian passage frame, set the wire saw cutting machine fixed mobile track on the pedestrian passage floor and install several wire saw cutting machines;

[0010] Step 5: Cutting of the concrete blocking wall to be demolished: The wire saw cutting machine cuts the concrete blocking wall to be demolished along the dividing line of the concrete blocking wall to be demolished by cutting the diamond chain to form a blocking wall cutting block;

[0011] Step 6. Lifting of the cut block of the blocking wall: Install an anti-slag device on the outside of the cut block of the blocking wall, and open a lifting groove. Use a car crane and lifting cables to complete the lifting of the cut block of the blocking wall.

[0012] Preferably, in step one: one side of the outer guide wall is connected to the underground continuous wall, the embedded PVC pipe and the embedded galvanized pipe extend from above the outer guide wall to the drainage ditch, and the drainage ditch is provided on the side of the reinforced concrete pavement above the slag dump.

[0013] Preferably, in step four: the scaffolding vertical poles are arranged on the scaffolding base, and a scaffolding chassis is arranged under the scaffolding base; the scaffolding vertical poles are connected and fixed to the scaffolding cross poles and the scaffolding short poles through scaffolding connectors.

[0014] Preferably, in step five: the rope saw cutting machine is provided with a rope saw cutting machine fixing rod; the wall to be demolished is cut in layers, and after the rope saw cutting machine completes cutting at the current position, it slides along the fixed movable track of the rope saw cutting machine to the next cutting position, and is fixed by the rope saw cutting machine fixing rod; after all the walls to be demolished on one layer are cut, the height of the scaffolding system is lowered, and then the cutting of the walls to be demolished on the lower layer is started, until all the walls to be demolished are cut.

[0015] Preferably, in step six: a non-slip base for the blocking wall cutting block is provided on the lower side of the anti-slag falling device, a bottom tray for the blocking wall cutting block is provided on the lower side of the non-slip base of the blocking wall cutting block, a lower lifting groove is symmetrically provided on the lower part of the bottom tray of the blocking wall cutting block, an upper lifting groove is provided on the upper part of the blocking wall cutting block at a position corresponding to the lower lifting groove, the lifting rope passes through the lower lifting groove and the upper lifting groove respectively and is connected to the automobile crane through a lifting ring and an automobile lifting rope.

[0016] A construction system for dismantling a concrete sealing wall of an ultra-deep foundation pit is obtained according to any of the above methods.

[0017] The beneficial effects of the present invention are:

[0018] 1) The present invention mills away the original asphalt layer and integrates the hoisting ground road and the guide wall by installing a double-layer steel mesh, which greatly improves the bearing capacity of the hoisting ground and effectively meets the travel requirements of heavy vehicles.

[0019] 2) The present invention provides a safety guardrail on the temporary passage scaffolding, which effectively ensures the safety of construction workers.

[0020] 3) The present invention sets a cutting guide fixing frame on the temporary channel scaffolding, and the rope saw cutting machine can slide on the fixed movable track of the rope saw cutting machine and be fixed by the rope saw cutting machine fixing rod, which effectively ensures the safety of the cutting process and effectively improves the cutting construction efficiency.

[0021] 4) The present invention provides a wastewater collection tank at the junction of the concrete sealing wall to be demolished and the reinforced concrete lower panel, so that the wastewater generated during the rope saw cutting process of the concrete sealing wall can be discharged through the wastewater collection tank, effectively improving the construction working environment.

[0022] 5) The present invention adopts a concrete blocking wall cutting and lifting structure. By installing an anti-slag device on the outside of the blocking wall cutting block, a non-slip base of the blocking wall cutting block is arranged on the lower side of the anti-slag device, and a blocking wall cutting block bottom tray is arranged on the lower side of the anti-slip base of the blocking wall cutting block, the possibility of slag falling during the lifting process of the concrete blocking wall cutting block is prevented, thereby effectively ensuring the safety of the construction operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the original hoisting ground structure;

[0024] Figure 2 It is a schematic diagram of the hoisting ground processing structure;

[0025] Figure 3 This is a schematic diagram of the structure of the temporary channel scaffolding and cutting guide fixing frame;

[0026] Figure 4 This is a detailed drawing of the fixed guide structure of the wire saw cutting machine;

[0027] Figure 5 This is a cross-sectional view of the concrete sealing wall structure of the ultra-deep foundation pit to be demolished;

[0028] Figure 6 It is a schematic diagram of the blocking wall cutting and lifting structure.

[0029] In the figure: 1-underground continuous wall, 2-external guide wall, 3-original ground, 4-slag, 5-reinforced concrete pavement, 6-reinforced mesh, 7-concrete, 8-original asphalt concrete pavement, 9-drainage ditch, 10-buried PVC pipe, 11-buried galvanized pipe, 12-concrete blocking wall to be demolished, 13-dividing line of concrete blocking wall to be demolished, 14-reinforcement of post-cast strip, 15-reinforced concrete upper panel, 16-reinforced concrete column, 17-reinforced concrete lower panel, 18-wastewater collection tank, 19-scaffolding base, 20-scaffolding chassis, 21-scaffolding short pole, 22-scaffolding cross bar, 23-scaffolding vertical pole, 24-scaffolding Frame connector, 25-scaffolding top support, 26-scaffolding top support spring, 27-pedestrian walkway frame, 28-pedestrian walkway bottom plate, 29-pedestrian walkway safety guardrail, 30-wire saw cutting machine fixed mobile track, 31-wire saw cutting machine, 32-cutting diamond chain, 33-wire saw cutting machine fixed rod, 34-car crane, 35-car crane cable, 36-lifting ring, 37-lifting cable, 38-lifting upper groove, 39-lifting lower groove, 40-blocking wall cutting block, 41-anti-slag corner guard, 42-anti-slag elastic belt, 43-anti-slag base, 44-blocking wall cutting block anti-slip base, 45-blocking wall cutting block bottom tray. DETAILED DESCRIPTION

[0030] The present invention will be further described below with reference to the following examples. The following examples are provided only to facilitate understanding of the present invention. It should be noted that, without departing from the principles of the present invention, it is possible for a person skilled in the art to make various modifications to the present invention, and such improvements and modifications fall within the scope of the claims of the present invention.

[0031] Example 1

[0032] A specific embodiment, such as Figures 1 to 6 As shown: Figure 1 This is the original hoisting ground structure diagram. Figure 2 This is a schematic diagram of the hoisting ground processing structure. Figure 3 This is a schematic diagram of the temporary channel scaffolding and cutting guide fixed frame structure. Figure 4 This is a detailed drawing of the fixed guide structure of the wire saw cutting machine. Figure 5 This is the cross-sectional view of the blocking wall structure to be demolished in the working well. Figure 6 It is a schematic diagram of the blocking wall cutting and lifting structure.

[0033] The construction method for dismantling the concrete sealing wall of an ultra-deep foundation pit mainly includes the following steps:

[0034] Step 1. Treatment and construction of the hoisting ground: mill off the asphalt layer of the original asphalt concrete pavement 8 on the upper side of the original ground 3, and also mill off the upper part of the outer guide wall 2 to the same height as the slag 4 milled from the asphalt layer, and lay double-layer steel mesh 6, embedded PVC pipe 10 and embedded galvanized pipe 11 on the upper part of the slag 4 and the outer guide wall 2 respectively, and then pour concrete 7 on the upper part of the slag 4 and the outer guide wall 2 to form a reinforced concrete pavement 5 in which the road and the guide wall are integrated. The other side of the outer guide wall 2 is connected to the underground continuous wall 1, and the wastewater on the outer guide wall 2 can be discharged into the drainage ditch 9 through the embedded PVC pipe 10 and the embedded galvanized pipe 11.

[0035] Step 2: Mark the dividing line 13 of the concrete blocking wall 12 to be demolished: On the premise of ensuring that the blocking wall cutting block 40 at the most unfavorable lifting position meets the lifting capacity requirements of the truck crane 34, mark the dividing line 13 of the concrete blocking wall 12 to be demolished.

[0036] Step 3: Construction of wastewater collection tank 18 during cutting: Set up wastewater collection tank 18 at the junction of the concrete blocking wall 12 to be demolished and the reinforced concrete lower panel 17.

[0037] Step 4: Set up the temporary passage scaffolding system: set up a scaffolding chassis 20 under the scaffolding base 19, connect the scaffolding vertical rods 23 to the scaffolding base 19, and the scaffolding vertical rods 23 are connected and fixed to the scaffolding cross bars 22 and the scaffolding short rods 21 through scaffolding connectors 24 respectively. When the scaffolding reaches the required height, the upper scaffolding vertical rods 23 are installed with scaffolding support springs 26, and the scaffolding support springs 26 are provided with scaffolding support 25.

[0038] Step 5. Construction of cutting guide fixed frame: A pedestrian walkway frame 27 is installed on each scaffolding top support 25, a pedestrian walkway base plate 28 is set on the bottom surface of the pedestrian walkway frame 27, a pedestrian walkway safety guardrail 29 is set on the side of the pedestrian walkway frame 27, a rope saw cutting machine fixed movable track 30 is set on the pedestrian walkway base plate 28, and a plurality of rope saw cutting machines 31 are installed on the rope saw cutting machine fixed movable track 30 at a certain distance. The rope saw cutting machine 31 can slide on the rope saw cutting machine fixed movable track 30 and be fixed by the rope saw cutting machine fixing rod 33.

[0039] Step 6. Cutting construction of the concrete blocking wall 12 to be demolished: The wire saw cutting machine 31 cuts the concrete blocking wall 12 to be demolished along the dividing line 13 of the concrete blocking wall to be demolished by cutting the diamond chain 32. Each wire saw cutting machine 31 is responsible for cutting the blocking wall 12 to be demolished in an area. After the wire saw cutting machine 31 completes cutting of the blocking wall 12 to be demolished in the area it is responsible for, it slides along the fixed movable track 30 of the wire saw cutting machine to a new area to cut the blocking wall 12 to be demolished. After all the blocking walls 12 to be demolished in one area are cut, the height of the scaffolding system is lowered to start cutting the blocking walls 12 to be demolished in the next area until all the blocking walls 12 to be demolished are cut.

[0040] Step seven, lifting of the blocking wall cutting block 40: an anti-slag device is installed on the outside of the blocking wall cutting block 40 cut by the rope saw cutting machine 31, a blocking wall cutting block anti-slip base 44 is provided on the lower side of the anti-slag device, a blocking wall cutting block bottom tray 45 is provided on the lower side of the blocking wall cutting block anti-slip base 44, a blocking wall cutting block bottom tray 45 is symmetrically provided with a lifting lower groove 39 on the lower part of the blocking wall cutting block bottom tray 45, a lifting upper groove 38 is provided on the upper part of the blocking wall cutting block 40 at a position corresponding to the lifting lower groove 39, a lifting rope 37 passes through the lifting lower groove 39 and the lifting upper groove 38 respectively and is connected to the automobile crane 34 through the lifting ring 36 and the automobile lifting rope 35, and the automobile crane 34 is used to complete the lifting of the blocking wall cutting block 40.

[0041] Example 2

[0042] The ultra-deep foundation pit concrete blocking wall demolition construction system obtained according to the ultra-deep foundation pit concrete blocking wall demolition construction method proposed in Example 1 includes the original hoisting ground structure, the hoisting ground treatment structure, the ultra-deep foundation pit concrete blocking wall structure to be demolished, the concrete blocking wall cutting process wastewater treatment structure, the temporary channel scaffolding and cutting guide fixed frame structure and the concrete blocking wall cutting and hoisting structure;

[0043] In the original hoisting ground structure, a slag 4 and an original asphalt concrete pavement 8 are sequentially arranged above the original ground 3. One side of the slag 4 and the original asphalt concrete pavement 8 is connected to an outer guide wall 2. The side of the outer guide wall 2 away from the slag 4 is connected to an underground continuous wall 1.

[0044] In the hoisting ground treatment structure, the outer guide wall 2 and the slag dump 4 are at the same height, and pre-buried PVC pipes 10, pre-buried galvanized pipes 11 and double-layer steel mesh 6 are arranged in sequence above the slag dump 4 and the outer guide wall 2; the double-layer steel mesh 6 in the hoisting ground treatment structure is covered with concrete 7, and the double-layer steel mesh 6 and concrete 7 form a reinforced concrete pavement 5, and the pre-buried PVC pipes 10 and pre-buried galvanized pipes 11 extend from the surface of the reinforced concrete pavement 5 above the outer guide wall 2 to the drainage ditch 9, and the drainage ditch 9 is arranged on the side of the reinforced concrete pavement 5 above the slag dump 4.

[0045] The structure of the concrete sealing wall to be demolished in the ultra-deep foundation pit includes a concrete sealing wall to be demolished 12 and a reinforced concrete lower panel 17. The wastewater treatment structure during the concrete sealing wall cutting process includes a wastewater collection tank 18. The wastewater collection tank 18 is arranged on the side where the reinforced concrete lower panel 17 is connected to the concrete sealing wall to be demolished 12; a concrete sealing wall dividing line 13 to be demolished is provided on the concrete sealing wall to be demolished 12, and the reinforced concrete lower panel 17 is connected to the reinforced concrete upper panel 15 through a reinforced concrete column 16. A post-cast joint steel bar 14 is provided between the reinforced concrete upper panel 15 and the concrete sealing wall to be demolished 12.

[0046] The temporary passage scaffolding and cutting guide fixed frame structure are arranged on the reinforced concrete lower panel 17. The bottom of the temporary passage scaffolding and cutting guide fixed frame structure is a scaffolding base 19. A scaffolding chassis 20 is provided under the scaffolding base 19. A scaffolding vertical rod 23 is connected to the scaffolding base 19. The scaffolding vertical rod 23 is connected and fixed to the scaffolding cross bar 22 and the scaffolding short rod 21 through a scaffolding connector 24. A scaffolding top support spring 26 is provided on the top scaffolding vertical rod 23. A scaffolding top support 25 is provided with a pedestrian walkway frame 27, a pedestrian walkway safety guardrail 29 is provided on the side of the pedestrian walkway frame 27, a pedestrian walkway bottom plate 28 and a fixed movable track 30 for a rope saw cutter are provided on the bottom surface of the pedestrian walkway frame 27, and a plurality of rope saw cutters 31 are slidably connected to the fixed movable track 30 for the rope saw cutter; the rope saw cutter 31 is provided with a rope saw cutter fixing rod 33; a pedestrian walkway safety guardrail 29 is provided on the side of the pedestrian walkway frame 27 away from the concrete blocking wall 12 to be demolished.

[0047] The concrete blocking wall cutting and lifting structure includes an anti-slag device and a car crane 34. The anti-slag device is sleeved on the outside of the blocking wall cutting block 40. The anti-slag base 43 in the anti-slag device is arranged at the bottom of the blocking wall cutting block 40. The side of the anti-slag base 43 is connected to an anti-slag elastic belt 42. The other end of the anti-slag elastic belt 42 is connected to the anti-slag corner guard 41. The anti-slag corner guard 41 is arranged at the top corner of the blocking wall cutting block 40.

[0048] The anti-slag device is connected in sequence to the anti-slip base 44 of the blocking wall cutting block and the bottom tray 45 of the blocking wall cutting block. The bottom tray 45 of the blocking wall cutting block is connected to the mobile crane 34 via a lifting cable 37. The bottom tray 45 of the blocking wall cutting block is symmetrically provided with lower lifting grooves 39. The upper portion of the blocking wall cutting block 40 is provided with an upper lifting groove 38, which corresponds to the lower lifting groove 39. The lifting cable 37 passes through the lower lifting groove 39, the upper lifting groove 38 and the lifting ring 36 in sequence to connect to the mobile crane cable 35, which is connected to the mobile crane 34.

Claims

1. A method for dismantling a concrete blocking wall in an ultra-deep foundation pit, characterized in that: The following steps are involved: Step 1: Treatment and construction of the hoisting ground: milling the original asphalt concrete pavement (8) in the original hoisting ground structure to form slag (4), milling the upper part of the outer guide wall (2) to the same height as the slag (4), setting pre-buried PVC pipes (10), pre-buried galvanized pipes (11) and double-layer steel mesh (6) on the slag (4) and the outer guide wall (2), and then pouring concrete (7) to form a reinforced concrete pavement (5); Step 2: Marking a dividing line (13) of the concrete blocking wall to be demolished (12); Step 3: Setting a wastewater collection tank (18) at the junction of the concrete sealing wall (12) to be demolished and the reinforced concrete lower panel (17); Step 4, erection of temporary passage scaffolding system: erect the temporary passage scaffolding and cutting guide fixed frame structure to the required height, install the scaffolding top support spring (26) and the scaffolding top support (25) on the top of the scaffolding vertical rod (23), install the pedestrian passage frame (27), set the pedestrian passage bottom plate (28) on the bottom surface of the pedestrian passage frame (27), set the pedestrian passage safety guardrail (29) on the side of the pedestrian passage frame (27), set the rope saw cutting machine fixed mobile track (30) on the pedestrian passage bottom plate (28) and install several rope saw cutting machines (31); Step 5, cutting construction of the concrete blocking wall to be demolished: the wire saw cutting machine (31) cuts the concrete blocking wall to be demolished (12) along the dividing line (13) of the concrete blocking wall to be demolished by cutting the diamond chain (32) to form a blocking wall cutting block (40); Step 6, lifting of the blocking wall cutting block: a slag-proof device is installed on the outside of the blocking wall cutting block (40), and an upper lifting groove (38) is opened. The blocking wall cutting block (40) is lifted by using a car crane (34) and a lifting cable (37); a blocking wall cutting block anti-skid base (44) is provided on the lower side of the slag-proof device, a blocking wall cutting block bottom tray (45) is provided on the lower side of the blocking wall cutting block anti-skid base (44), a lower lifting groove (39) is symmetrically provided on the lower part of the blocking wall cutting block bottom tray (45), and the upper lifting groove (38) is provided on the upper part of the blocking wall cutting block (40) at a position corresponding to the lower lifting groove (39). The lifting cable (37) passes through the lower lifting groove (39) and the upper lifting groove (38) respectively and is connected to the car crane (34) through the lifting ring (36) and the car lifting cable (35).

2. The method for dismantling the ultra-deep foundation pit concrete blocking wall according to claim 1, characterized in that: In step 1, one side of the outer guide wall (2) is connected to the underground continuous wall (1), and the pre-buried PVC pipe (10) and the pre-buried galvanized pipe (11) extend from the top of the outer guide wall (2) to the drainage ditch (9), and the drainage ditch (9) is located on the side of the reinforced concrete pavement (5) above the slag (4).

3. The method for dismantling the ultra-deep foundation pit concrete blocking wall according to claim 1, characterized in that: In step 4, the scaffolding vertical rods (23) are arranged on the scaffolding base (19), and the scaffolding chassis (20) is arranged under the scaffolding base (19); the scaffolding vertical rods (23) are respectively connected and fixed to the scaffolding cross rods (22) and the scaffolding short rods (21) through the scaffolding connectors (24).

4. The method for dismantling the ultra-deep foundation pit concrete blocking wall according to claim 1, characterized in that: In step 5: the rope saw cutting machine (31) is provided with a rope saw cutting machine fixing rod (33); the concrete blocking wall (12) to be demolished is cut layer by layer, and after the rope saw cutting machine (31) completes cutting at the current position, it slides along the rope saw cutting machine fixed movable track (30) to the next cutting position and is fixed by the rope saw cutting machine fixing rod (33); after all the concrete blocking walls (12) to be demolished on one layer are cut, the height of the scaffolding system is lowered, and then the cutting of the concrete blocking walls (12) to be demolished on the next layer is started, until all the concrete blocking walls (12) to be demolished are cut.

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