A construction method for layered breaking of underground continuous wall at connection between new and old subway stations

Abstract

The present application relates to the technical field of building foundation pit construction, more specifically, relates to a kind of new and old subway station connection underground diaphragm wall layered breaking construction method. The position of the continuous wall at the connection between the new and old stations and the surrounding environment are determined; a retaining wall is set up in the new station area at the connection; a first support is set up between the bottom area of the continuous wall and the retaining wall; supports are set up between the continuous wall and the retaining wall, and a floor is set up at the bottom of the continuous wall and the retaining wall; the continuous wall is divided into breaking layers; the first support and the floor are retained, and the continuous wall in the middle is sequentially broken layer by layer; a movable two-way wall breaker is installed at the head of the continuous wall, and the head of the continuous wall is broken layer by layer. The continuous wall at the connection is stably broken, the space required for breaking is reduced, the damage to the existing structure is reduced, the construction speed is increased, and the safety of the construction is ensured. The present application is mainly used in the layered breaking of the underground continuous wall at the connection between the new and old subway stations.

Description

Technical Field

[0001] The present invention relates to the technical field of building foundation pit construction, and more particularly to a construction method for layered demolition of underground continuous walls at the junction of a new and an old subway station. Background Art

[0002] Currently, the transition between transfer stations is a common structural feature during subway construction. When a new station connects to an existing one, the diaphragm wall at the junction between the old and new stations needs to be demolished. The current method for removing diaphragm walls at station junctions is to manually dismantle the diaphragm wall after the new and old stations are fully constructed. Because the old and new structures are already built, dismantling the existing diaphragm wall presents difficulties, a long construction period, and low safety risks. Therefore, a construction method is needed that can quickly and reliably dismantle the diaphragm wall at the junction.

[0003] Through the above analysis, the problems and defects of the existing technology are as follows:

[0004] The demolition of existing continuous walls has problems such as difficult construction, long construction period and low safety.

[0005] The difficulty of solving the above problems and defects is:

[0006] The existing construction processes such as manual chiseling, mechanical demolition, and shallow hole micro-difference blasting will seriously affect the stress state of the station structure, affecting the operating order and safety of existing operating stations. At the same time, after the demolition construction, the structure will suffer from internal force redistribution, affecting the long-term safety of the structure.

[0007] The significance of solving the above problems and defects is:

[0008] It helps to shorten construction period, eliminate safety risks and reduce the impact on existing operating stations. Summary of the Invention

[0009] To overcome the shortcomings of the prior art, the present invention provides a method for layered demolition of underground diaphragm walls at the junction of old and new subway stations. This method enables stable demolition of diaphragm walls at the junction of old and new subway stations, reduces the space required for demolition, minimizes damage to existing structures, and accelerates construction speed, ensuring construction safety.

[0010] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0011] A construction method for layered demolition of underground continuous walls at the junction of new and old subway stations comprises the following steps:

[0012] S101. Determine the location of the continuous wall at the junction of the new and old stations and the surrounding environment based on the site and drawings;

[0013] S102. Set up a retaining wall in the new station area at the junction;

[0014] S103. Set up a first support between the bottom area of ​​the diaphragm wall and the retaining wall;

[0015] S104. Install supports between the diaphragm wall and the retaining wall according to the height of the diaphragm wall, and install a base plate at the bottom of the diaphragm wall and the retaining wall;

[0016] S105, dividing the diaphragm wall into different demolition layers according to the supporting parts;

[0017] S106: retain the first support and the bottom plate, and demolish the middle continuous wall layer by layer according to the position of the support from top to bottom;

[0018] S107. Install a movable bidirectional wall breaker at the top of the continuous wall, and finally use the movable bidirectional wall breaker to movably break the top of the continuous wall.

[0019] In step S102, when a retaining wall is set up in the new station area at the junction, the height of the retaining wall is higher than the continuous wall.

[0020] In step S103, the first support is reinforced concrete support.

[0021] In step S104, a second support or multiple supports are set between the continuous wall and the retaining wall according to the height.

[0022] In the step S104, when a bottom plate is provided at the bottom of the continuous wall, the bottom plate is cast using reinforced concrete material.

[0023] In step S104, when setting the bottom plate at the bottom of the continuous wall, embedded parts are tied at the end where the bottom plate and the continuous wall are connected to strengthen the connection force between the bottom plate and the continuous wall, and a steel bar connector is set at the end away from the continuous wall to reserve space for connecting the new subway station structure.

[0024] In step S105, the continuous wall is divided into different demolition layers according to the supporting parts. The demolition layers are not completely through, and the distance between the two sides and the wall edge is equal to the thickness of the continuous wall.

[0025] In step S106, when the first support and the bottom plate are retained, the demolition layer and the corresponding inner support are removed in order from top to bottom, and the continuous wall in the middle is demolished layer by layer according to the position of the support.

[0026] The intervals between adjacent supports are 3 to 5 meters, and the support material is steel pipe support.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention adopts a construction method of layered demolition of underground continuous walls to demolish the continuous walls at the junction of old and new subway stations. By setting a retaining wall outside the continuous wall and setting a support and a bottom plate between the retaining wall and the continuous wall, a closed structure consisting of the retaining wall, the top support, the bottom plate and the continuous wall is formed. In the above-mentioned closed structure, a plurality of internal supports are set between the continuous wall and the retaining wall according to the height of the continuous wall. When performing layered demolition, the first support is retained, and the continuous wall is first demolished in layers from top to bottom according to the set support positions. At this time, the first support and the bottom plate can support the retaining wall, thereby improving the safety of the overall demolition and being able to quickly demolish the walls between them, effectively solving the problems of slow demolition speed and high environmental requirements of underground continuous walls, and reducing the impact on existing structures.

[0029] The present invention can stably demolish the continuous wall at the junction of the new and old subway stations, reduce the space required for demolition, reduce damage to the existing structure, speed up the construction, and ensure the safety of the construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the construction process of the present invention;

[0031] Figure 2 This is a schematic diagram of the construction principle of the present invention;

[0032] Figure 3 This is a schematic diagram of the removal of the internal support of the present invention;

[0033] Figure 4 This is a schematic diagram of the demolition of the continuous wall of the present invention;

[0034] Figure 5 It is a structural schematic diagram of the movable bidirectional wall breaking device of the present invention;

[0035] In the figure: 1 is a continuous wall, 2 is a reinforced concrete base plate, 3 is a retaining wall, 4 is a first support, 5 is a second support, 6 is a third support, 7 is a pre-buried steel bar connector, 8 is a movable two-way wall breaker, 10 is a connecting frame, 11 is an exhaust fan, 12 is a ventilator, 13 is a sleeve, 14 is a mounting rod, 15 is a motor, 16 is a sliding rod, and 17 is a second rack. DETAILED DESCRIPTION

[0036] In order to more clearly understand the above-mentioned objects, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that, in the absence of conflict, the embodiments of the present application and the features therein can be combined with each other.

[0037] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from the description. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0038] like Figures 1 to 5 As shown, a construction method for layered demolition of underground continuous walls at the junction of new and old subway stations includes the following steps: S101, determining the location and surrounding environment of the continuous wall 1 at the junction of the new and old stations based on the site and drawings;

[0039] S102. Set up a retaining wall 3 in the new station area at the junction;

[0040] S103, setting a first support 4 between the bottom area of ​​the continuous wall 1 and the retaining wall 3;

[0041] S104. According to the height of the continuous wall 1, support is provided between the continuous wall 1 and the retaining wall 3, and a reinforced concrete bottom plate 2 is provided at the bottom of the continuous wall 1 and the retaining wall 3;

[0042] S105, dividing the diaphragm wall 1 into different demolition layers according to the supporting parts;

[0043] S106: retain the first support 4 and the reinforced concrete base plate 2, and demolish the middle continuous wall 1 layer by layer according to the position of the support from top to bottom;

[0044] S107, installing a movable bidirectional wall breaker 8 on the top of the continuous wall 1, and finally using the movable bidirectional wall breaker 8 to movably break the top of the continuous wall 1.

[0045] Preferably, in step S102 , when setting up a retaining wall 3 in the new station area at the junction, the height of the retaining wall 3 is higher than the continuous wall 1 .

[0046] Preferably, in step S103, the first support 4 is a reinforced concrete support.

[0047] Preferably, in step S104, a second support 5 or multiple supports are provided between the continuous wall 1 and the retaining wall 3 according to the height.

[0048] Preferably, in step S104, when the reinforced concrete bottom plate 2 is provided at the bottom of the continuous wall 1, the reinforced concrete bottom plate 2 is cast using reinforced concrete material.

[0049] Preferably, in step S104, when a reinforced concrete base plate 2 is set at the bottom of the continuous wall 1, embedded parts are tied at the end where the reinforced concrete base plate 2 is connected to the continuous wall 1 to strengthen the connection force between the reinforced concrete base plate 2 and the continuous wall 1, and a steel bar connector is set at the end away from the continuous wall 1 to reserve space for connecting the newly built subway station structure.

[0050] Preferably, in step S105 , the continuous wall 1 is divided into different broken layers according to the supporting parts, and the broken layers are not completely through, and the distances between the two sides and the wall edges are equal to the thickness of the continuous wall 1 .

[0051] Preferably, in step S106, when the first support 4 and the reinforced concrete base plate 2 are retained, the broken layers and the corresponding internal supports are removed in order from top to bottom, and the continuous wall 1 in the middle is broken layer by layer according to the position of the supports.

[0052] Preferably, the interval between adjacent supports is 3 to 5 m, and the support material is steel pipe support.

[0053] The specific operation steps are: after determining the position and surrounding environment of the continuous wall 1 at the junction of the new and old stations, execute step S102, set up a retaining wall 3 around the structural area of ​​the new subway station, and control the distance between the retaining wall 3 and the underground continuous wall 1 to be 3~5m; then execute step S103.

[0054] Execute step S103 to set up a first support 4 on the top of the retaining wall 3 and the underground continuous wall 1. The first support 4 is made of reinforced concrete and has a size of 0.8m×1.0m; then execute step S104.

[0055] Execute step S104, set internal supports between the retaining wall 3 and the underground continuous wall 1 according to the wall height, set the interval between the second support 5 and the third support 6 according to 3~5m, the second support 5 and the third support 6 are steel pipe supports with a diameter of 800mm.

[0056] Execute step S104 to cast a reinforced concrete base plate 2 between the retaining wall 3 and the continuous wall 1, and the reinforced concrete base plate 2 is close to the underground continuous wall 1 and is tied with pre-buried steel bar connectors 7 at the bottom of the retaining wall 3. Then execute step S105.

[0057] Execute step S105 to divide the continuous wall into different demolition layers according to the height and the position of the internal support, and the height of the demolition layer is 3-5m; then execute step S106.

[0058] Execute step S106, remove the second support 5, and use crushing equipment to break the continuous wall 1 between the first support 4, the second support 5 and the third support 6 from top to bottom. It is not necessary to break through all the walls during the demolition. Leave a certain distance on both sides, which is roughly the thickness of the continuous wall 1.

[0059] Repeat step S106 until all supports and walls of the underground continuous wall are removed, and then execute step S107.

[0060] Execute step S107, install a movable bidirectional wall breaker 8 on the top of the continuous wall, and finally use the wall breaker to movably break the top of the continuous wall until the continuous wall is completely broken.

[0061] The movable bidirectional wall breaking device 8 in the embodiment of the present invention includes a connecting frame 10, a ventilation fan 11 is fixedly installed on the top of the connecting frame 10, a ventilation plate 12 is fixedly installed on the top surface of the inner part of the connecting frame 10, and a sleeve 13 is symmetrically welded to the lower end of the connecting frame 10;

[0062] A mounting rod 14 is fixedly mounted on the outer side of the upper surface of the sleeve 13, a motor 15 is fixedly mounted on the outer end of the mounting rod 14, a turntable is mounted in the middle of the motor 15, a first rack is fixedly mounted on the side of the turntable, and the first rack is arranged around the turntable.

[0063] A slide rod 16 is sleeved inside the sleeve 13 , and a second rack 17 is fixedly mounted on the upper surface of the slide rod 16 .

[0064] The first rack on the turntable is engaged with the second rack 17 on the slide bar 16. The motor 15 is started to drive the turntable to rotate. Under the action of the second rack 17, the slide bar 16 moves toward each other in the horizontal direction to break the continuous wall.

[0065] The above only describes in detail the preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of the present invention, and various changes should be included in the scope of protection of the present invention.

Claims

1. A construction method for layered demolition of underground continuous walls at the junction of new and old subway stations, characterized in that: The following steps are involved: S101. Determine the location of the continuous wall at the junction of the new and old stations and the surrounding environment based on the site and drawings; S102. Set up a retaining wall in the new station area at the junction; S103. Set up a first support between the bottom area of ​​the diaphragm wall and the retaining wall; S104. Install supports between the diaphragm wall and the retaining wall according to the height of the diaphragm wall, and install a base plate at the bottom of the diaphragm wall and the retaining wall; S105, dividing the diaphragm wall into different demolition layers according to the supporting parts; S106: retain the first support and the bottom plate, and demolish the middle continuous wall layer by layer according to the position of the support from top to bottom; S107. Install a movable bidirectional wall breaker at the top of the continuous wall, and finally use the movable bidirectional wall breaker to movably break the top of the continuous wall.

2. The construction method for layered demolition of underground continuous walls at the junction of new and old subway stations according to claim 1 is characterized by: In step S102, when a retaining wall is set up in the new station area at the junction, the height of the retaining wall is higher than the continuous wall.

3. The construction method for layered demolition of underground continuous walls at the junction of new and old subway stations according to claim 1 is characterized by: In step S103, the first support is reinforced concrete support.

4. The construction method for layered demolition of underground continuous walls at the junction of new and old subway stations according to claim 1 is characterized by: In step S104, a second support or multiple supports are set between the continuous wall and the retaining wall according to the height.

5. The construction method for layered demolition of underground continuous walls at the junction of new and old subway stations according to claim 1 is characterized by: In the step S104, when a bottom plate is provided at the bottom of the continuous wall, the bottom plate is cast using reinforced concrete material.

6. The construction method for layered demolition of underground continuous walls at the junction of new and old subway stations according to claim 1 is characterized by: In step S104, when setting the bottom plate at the bottom of the continuous wall, embedded parts are tied at the end where the bottom plate and the continuous wall are connected to strengthen the connection force between the bottom plate and the continuous wall, and a steel bar connector is set at the end away from the continuous wall to reserve space for connecting the new subway station structure.

7. The construction method for layered demolition of underground continuous walls at the junction of new and old subway stations according to claim 1 is characterized by: In step S105, the continuous wall is divided into different demolition layers according to the supporting parts. The demolition layers are not completely through, and the distance between the two sides and the wall edge is equal to the thickness of the continuous wall.

8. The construction method for layered demolition of underground continuous walls at the junction of new and old subway stations according to claim 1 is characterized by: In step S106, when the first support and the bottom plate are retained, the demolition layer and the corresponding inner support are removed in order from top to bottom, and the continuous wall in the middle is demolished layer by layer according to the position of the support.

9. The construction method for layered demolition of underground continuous walls at the junction of new and old subway stations according to claim 4 is characterized by: The intervals between adjacent supports are 3 to 5 meters, and the support material is steel pipe support.

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