A construction method for horizontal excavation of anti-floating wall toe in stone foundation pit

Abstract

The present invention discloses a construction method for horizontal excavation of the toe of an anti-floating wall in a stone foundation pit, comprising: step one: excavating the foundation pit to the bottom plate to expose the front position of the toe of the anti-floating wall; step two: drilling a hole at the positive position of the toe of the anti-floating wall using a water drill; step three: laying two steel rails perpendicular to the side wall in the direction facing the toe of the wall, and arranging a movable cutting device on the steel rails; step four: driving the cutting device to contact the unseparated surface of the toe of the anti-floating wall in sequence, and separating the toe of the anti-floating wall from the original rock surface as a whole; the wall toe construction method of the present invention can speed up the efficiency of the excavation construction of the wall toe and similar wall toes of stone, reduce the difficulty of the construction of the toe of the stone foundation pit wall, and the manufacturing and processing of the working platform is simple and low-cost, and only requires pulleys, rails, vertical poles, steel pipes, etc., and the materials are available everywhere and the processing is simple. The method is highly practical and has a simple structure and is easy to promote.

Description

Technical Field

[0001] The invention relates to the technical field of wall toe construction, in particular to a construction method for horizontal excavation of an anti-floating wall toe in a stone foundation pit. Background Art

[0002] An increasing number of projects are adopting anti-floating wall toes for rock foundation pit anti-floating design. When certain factors necessitate removal of the anti-floating wall toe, the unique location of the toe presents numerous construction difficulties. In practice, traditional methods such as water drilling are often used to construct the toe. However, these methods suffer from low efficiency and high costs, hindering the widespread adoption of this cost-effective anti-floating design. Summary of the Invention

[0003] The main purpose of the present invention is to provide a construction method for horizontal excavation of the toe of an anti-floating wall in a stone foundation pit, aiming to solve the existing technical problems.

[0004] To achieve the above-mentioned object, the present invention provides a construction method for horizontal excavation of the toe of an anti-floating wall in a stone foundation pit, comprising:

[0005] Step 1: Excavate the foundation pit to the bottom plate to expose the front of the anti-floating wall toe;

[0006] Step 2: Use a water drill to drill a hole at the positive position of the anti-floating wall toe;

[0007] Step 3: Lay two steel rails perpendicular to the side wall and facing the wall toe, and arrange a movable cutting device on the rails;

[0008] Step 4: driving the cutting device to contact the unseparated surface of the anti-floating wall toe in turn, and separating the anti-floating wall toe from the original rock surface as a whole.

[0009] Furthermore, the cutting device includes a movable vertical pole mounted on the steel rail, the vertical pole is a retractable structure, and a working platform that can move along the track direction and perpendicular to the track is set on the vertical pole, and the working platform is provided with symmetrical steel pipes parallel to the steel rail, and a pulley is provided at the front end of the steel pipe. A rope saw is provided on the working platform, and the rope saw is arranged to bypass the pulleys on both sides and is driven by a power device.

[0010] Furthermore, in step four, first, the height of the cutting device is adjusted, and the cutting device is moved horizontally so that the cutting device cuts along the upper edge of the anti-floating wall toe, so that the upper side of the anti-floating wall toe is separated from the original rock surface; secondly, the cutting device is moved up and down to separate the original rock surface inside the anti-floating wall toe; finally, the rope saw cutting device is moved in the opposite direction to the first step to separate the lower side of the anti-floating wall toe from the original rock surface.

[0011] Furthermore, in step 2, holes are continuously drilled along the vertical position on the left and right sides of the anti-floating wall toe during the drilling process. The diameter of a single hole is larger than the diameter of the steel pipe, and the drilling depth is the designed depth of the anti-floating wall toe.

[0012] Furthermore, the working platform is provided with a pulling-back mechanism, which is respectively connected to the base of the supporting power device and the ends of two steel pipes close to the working platform through a connecting mechanism. When the anti-floating wall toe is completely separated from the original rock surface, the cutting device is moved in the opposite direction to the vertical cutting surface and then moved upward to the middle position. The rope saw surrounds the anti-floating wall toe, and the detached anti-floating wall toe is pulled onto the steel rail through the pulling-back mechanism. The anti-floating wall toe moves outward synchronously with the withdrawal of the cutting device.

[0013] Furthermore, the spacing between the two rails is adapted to the width of the anti-floating wall toe, and two movable sliding mechanisms are provided on the rails. The sliding mechanisms and the rails are detachable. When the detached anti-floating wall toe is pulled out, one end of the anti-floating wall toe is first pulled onto a single sliding mechanism. After the anti-floating wall toe is completely pulled out, another sliding mechanism is installed on the rail, and the other end of the anti-floating wall toe is in contact with it, and the anti-floating wall toe is pulled out together with the sliding mechanism.

[0014] Furthermore, the sliding mechanism includes a load-bearing bracket, the middle section of the load-bearing bracket is a concave structure, and rollers are provided at both ends of the load-bearing bracket. The rollers are driven to clamp and release by a pneumatic structure. The concave end in the middle of the load-bearing bracket is provided with a support plate perpendicular to the same plane as it, and the support plate is connected to the hydraulic jacking structure.

[0015] Furthermore, during the excavation of the foundation pit, after excavation reaches the bottom plate, continue to excavate downward by -cm so that the side of the excavation is flush with the outer surface of the anti-floating wall toe.

[0016] The beneficial effects of the present invention are embodied in:

[0017] The wall toe construction method of the present invention can speed up the efficiency of wall toe and similar wall toe stone excavation construction, reduce the difficulty of stone foundation pit wall toe construction, and the working platform is simple to manufacture and process at low cost. It only requires pulleys, rails, poles, steel pipes, etc. The materials are available everywhere and are simple to process. The method is highly practical and has a simple structure and is easy to promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 Design cross-sections for anti-floating wall toe structures;

[0019] Figure 2 This is a schematic diagram of the front construction of the anti-floating wall toe of the present invention;

[0020] Figure 3 This is an axonometric drawing of the anti-floating wall toe cutting construction of the present invention;

[0021] Figure 4 This is a schematic structural diagram of the sliding mechanism of the present invention;

[0022] Figure 5 It is a construction front view of the present invention.

[0023] Figure numerals: 1. Foundation pit top plate; 2. Foundation pit side wall; 3. Bottom plate; 4. Anti-floating wall toe; 5. Rocks around the foundation pit; 6. Wall toe edge line; 7. Water drilling hole; 8. Vertical pole; 9. Pulley; 10. Rope saw; 11. Power unit; 12. Rail; 13. Steel pipe; 14. Pulling mechanism; 16. Sliding mechanism; 161. Load-bearing bracket; 162. Roller; 163. Support plate. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. In the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0025] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0026] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or schemes in which A and B are satisfied at the same time. In addition, "multiple" refers to more than two. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is mutually contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist.

[0027] See also Figure 1-3 The present invention provides a construction method for horizontal excavation of an anti-floating wall toe in a stone foundation pit, comprising:

[0028] Step 1: Excavate the foundation pit to the bottom plate 3 to expose the front position of the anti-floating wall toe 4; Figure 1 The foundation pit top plate 1, foundation pit side wall 2 and bottom plate 3 shown are cast as a whole after the anti-floating wall toe 4 is excavated, and the anti-floating wall toe is embedded in the rock 5 around the foundation pit.

[0029] Step 2: Use a water drill to drill a hole in the positive position of the anti-floating wall toe 4, that is Figure 2 Water borehole 7;

[0030] Step 3: Lay two steel rails 12 perpendicular to the side wall and facing the wall toe, and arrange a movable cutting device on the steel rails 12;

[0031] Step 4: driving the cutting device to contact the unseparated surface of the anti-floating wall toe 4 in sequence, and separating the anti-floating wall toe 4 from the original rock surface as a whole.

[0032] The traditional method uses a water drill to drill holes in sequence, dividing the anti-floating wall toe into multiple parts for removal. The operation is complicated, labor-intensive, and reduces work efficiency. The wall toe construction method of the present invention can speed up the efficiency of wall toe and similar wall toe stone excavation construction, reduce the difficulty of stone foundation pit wall toe construction, and the operation platform is simple to manufacture and process at low cost. It only needs simple structural materials to make a cutting device. The materials are available everywhere and the processing is simple. The method is highly practical and has a simple structure and is easy to promote.

[0033] In one embodiment, see Figure 3 The cutting device includes a movable upright pole 8 mounted on a steel rail 12. The upright pole 8 is a retractable structure, and a working platform that can move along the track direction and perpendicular to the track is set on the upright pole 8. A symmetrical steel pipe 13 parallel to the steel rail 12 is provided on the working platform. A pulley 9 is provided at the front end of the steel pipe 13. A rope saw 10 is provided on the working platform. The rope saw 10 is set around the pulleys 9 on both sides and is driven by a power device 11.

[0034] Among them, the power device 11 can be a motor, and the bottom end of the vertical pole 8 slides with the rail 12 through a slider. There are four vertical poles 8, and adjacent vertical poles 8 are connected by fixed support rods. The working platform can be made of wood and can be fixed to the vertical poles 8 by steel wire.

[0035] The wire saw 10 is driven to rotate by the power device 11 and the vertical pole 8 is moved to move the cutting device as a whole toward the anti-floating wall toe 4 , so that the wire saw 10 moves in a U-shaped path, thereby realizing the separation construction of the anti-floating wall toe 4 .

[0036] In one embodiment, in step four, first, the height of the cutting device is adjusted, and the cutting device is moved horizontally so that the cutting device cuts along the upper edge of the anti-floating wall toe 4, so that the upper side of the anti-floating wall toe 4 is separated from the original rock surface; secondly, the cutting device is moved up and down so that the original rock surface inside the anti-floating wall toe 4 is separated; finally, the rope saw cutting device is moved in the opposite direction to the first step so that the lower side of the anti-floating wall toe 4 is separated from the original rock surface.

[0037] In this way, the anti-floating wall toe 4 can be quickly separated by rope cutting on both sides of the water-drilling hole, which can ensure the flatness of the separation surface and the foundation of the original rock surface without damaging it, and can quickly separate the anti-floating wall toe 4, avoiding the problem of dividing the anti-floating wall toe into multiple parts for removal, which is complicated to operate, labor-intensive, and reduces work efficiency.

[0038] In one embodiment, during step 2, the drilling process involves continuous drilling along the vertical lines of the left and right edges of the anti-floating wall toe 4. The diameter of each drilled hole is larger than the diameter of the steel pipe 13, and the drilled hole depth is the designed depth of the anti-floating wall toe 4. This operation facilitates the initial separation of the left and right connecting surfaces of the anti-floating wall toe 4, providing a path for the subsequent entry of the cutting device. The two different construction methods complete the separation of the anti-floating wall toe 4, resulting in a flush rock surface after separation without excessive intrusion into the original rock foundation, while significantly improving construction efficiency.

[0039] In one embodiment, see Figure 5 The working platform is equipped with a retraction mechanism 14, which is connected to the base of the power unit 11 and the ends of two steel pipes 13 near the working platform via a connecting mechanism. When the anti-floating wall toe 4 is completely separated from the original rock surface, the cutting device is reversed to the vertical cutting surface and then moved upward to the middle position. The rope saw 10 surrounds the anti-floating wall toe 4, and the retraction mechanism 14 pulls the disengaged anti-floating wall toe 4 onto the steel rail 12. The anti-floating wall toe 4 moves outward synchronously with the withdrawal of the cutting device. The retraction mechanism 14 can be a tension cylinder, and the connecting mechanism can be a connecting rod.

[0040] By operating in this way, after the anti-floating wall toe 4 is completely separated from the original rock surface, the rope saw 10 can be moved in the opposite direction to the middle position of the vertical cutting surface, and pulled outward by the cutting device, the anti-floating wall toe can be pulled outward simultaneously, so that it is separated from its original position, making it convenient for the staff to carry out subsequent processing. There is no need to completely move out the cutting device and other structures before taking out the anti-floating wall toe 4, which simplifies the operation steps and improves work efficiency.

[0041] In one embodiment, see Figure 4The spacing between the two rails 12 is adapted to the width of the anti-floating wall toe 4, and two movable sliding mechanisms 16 are provided on the rail 12. The sliding mechanisms 16 and the rail 12 are detachable. When the detached anti-floating wall toe 4 is pulled out, one end of the anti-floating wall toe 4 is first pulled onto a single sliding mechanism 16. After the anti-floating wall toe 4 is completely pulled out, the other sliding mechanism 16 is installed on the rail 12, and the other end of the anti-floating wall toe 4 contacts it, and the anti-floating wall toe 4 is pulled out together with the sliding mechanism 16.

[0042] By doing this, after the anti-floating wall toe 4 is completely separated from the original rock surface, the anti-floating wall toe 4 can be lifted up by quickly installing the sliding mechanism 16, so that it can easily slide on the rail 12, making it convenient to quickly move and transport the separated and detached anti-floating wall toe 4, reducing labor intensity and improving the processing efficiency of the anti-floating wall toe 4 after separation.

[0043] In one embodiment, the sliding mechanism 16 includes a support bracket 161 with a concave center section. Rollers 162 are provided at both ends of the support bracket 161. Rollers 162 are pneumatically driven to tighten and loosen the support bracket 161. A support plate 163, perpendicular to the same plane as the concave center section of the support bracket 161, is provided at each end. Support plate 163 is connected to a hydraulic lifting mechanism. The pneumatic mechanism can utilize a bidirectional telescopic cylinder, while the hydraulic lifting mechanism can utilize a hydraulic rod.

[0044] When the anti-floating wall toe 4 is completely separated from the original rock surface, a sliding mechanism 16 is installed on the rail 12. Specifically, the load-bearing bracket 161 is placed on the rail 12, and the rollers 162 on both sides are pulled into contact with the rail 12 through the pneumatic structure, and movably cooperate with the rail 12. Then, by inserting the support plate 163 into the bottom of the anti-floating wall toe 4, the hydraulic jacking structure is used to lift one end of the anti-floating wall toe 4 and move it to the support plate 163, so that the anti-floating wall toe 4 is pulled out. After it is completely pulled out, the other side sliding mechanism 16 is installed at the other end of the anti-floating wall toe 4. Finally, the anti-floating wall toe 4 is moved outward along the rail 12 for transportation, thereby improving the efficiency of the anti-floating wall toe 4 being pulled out.

[0045] In one embodiment, during the excavation of the foundation pit, after reaching the bottom plate 3, the excavation is continued downward by 5-10 cm until the side of the excavation is flush with the outer surface of the anti-floating wall toe 4. This operation facilitates the anti-floating wall toe 4 to have a height difference with the rail 12 during the process of being separated and pulled outward, so that the anti-floating wall toe 4 can move from a high position to a low position and smoothly land on the rail 12, thus facilitating subsequent handling and relocation.

[0046] The above are only 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 should be included in the scope of protection of the present invention.

Claims

1. A construction method for horizontal excavation of anti-floating wall toe in stone foundation pit, characterized in that ,include: Step 1: excavate the foundation pit to the bottom plate (3) to expose the front position of the anti-floating wall toe (4); Step 2: Use a water drill to drill a hole at the positive position of the anti-floating wall toe (4); Step 3: Lay two steel rails (12) perpendicular to the side wall and facing the wall toe, and arrange a movable cutting device on the steel rails (12); Step 4: driving the cutting device to contact the unseparated surface of the anti-floating wall toe (4) in sequence, and separating the anti-floating wall toe (4) from the original rock surface as a whole; The cutting device comprises a vertical pole (8) mounted on a steel rail (12) and movable thereon, the vertical pole (8) being a telescopic structure, and a working platform being mounted on the vertical pole (8) and movable along the rail direction and perpendicular to the rail direction, the working platform being provided with a symmetrical steel pipe (13) parallel to the steel rail (12), the front end of the steel pipe (13) being provided with a pulley (9), the working platform being provided with a rope saw (10), the rope saw (10) being arranged to bypass the pulleys (9) on both sides and being driven by a power device (11); In the fourth step, first, the height of the cutting device is adjusted, and the cutting device is moved horizontally so that the cutting device cuts along the upper edge of the anti-floating wall toe (4), so that the upper side of the anti-floating wall toe (4) is separated from the original rock surface; second, the cutting device is moved up and down so that the inner side of the anti-floating wall toe (4) is separated from the original rock surface; finally, the cutting device is moved in the opposite direction to the first step so that the lower side of the anti-floating wall toe (4) is separated from the original rock surface.

2. A construction method for horizontal excavation of an anti-floating wall toe in a stone foundation pit according to claim 1, characterized in that: In the second step, holes are continuously drilled along the vertical position at the left and right edges of the anti-floating wall toe (4) during the drilling process. The diameter of a single hole is larger than the diameter of the steel pipe (13), and the drilling depth is the designed depth of the anti-floating wall toe (4).

3. The construction method for horizontal excavation of the anti-floating wall toe in a stone foundation pit according to claim 1, characterized in that: The working platform is provided with a pulling-back mechanism (14), which is connected to the base of the supporting power device (11) and the ends of two steel pipes (13) close to the working platform through a connecting mechanism. When the anti-floating wall toe (4) is completely separated from the original rock surface, the cutting device is moved in the reverse direction to the vertical cutting surface and then moved upward to the middle position. The rope saw (10) surrounds the anti-floating wall toe (4), and the detached anti-floating wall toe (4) is pulled onto the steel rail (12) by the pulling-back mechanism (14). The anti-floating wall toe (4) moves outward synchronously with the withdrawal of the cutting device.

4. A construction method for horizontal excavation of an anti-floating wall toe in a stone foundation pit according to claim 1 or 3, characterized in that: The spacing between the two steel rails (12) is adapted to the width of the anti-floating wall toe (4), and two movable sliding mechanisms (16) are provided on the steel rail (12). The sliding mechanisms (16) and the steel rail (12) are detachably arranged. When the detached anti-floating wall toe (4) is pulled outward, one end of the anti-floating wall toe (4) is first pulled onto a single sliding mechanism (16). After the anti-floating wall toe (4) is completely pulled out, another sliding mechanism (16) is installed on the steel rail (12) and the other end of the anti-floating wall toe (4) is brought into contact with the sliding mechanism, and the anti-floating wall toe (4) is pulled out together with the sliding mechanism (16).

5. A construction method for horizontal excavation of the anti-floating wall toe in a stone foundation pit according to claim 4, characterized in that: The sliding mechanism (16) includes a bearing bracket (161), the middle section of the bearing bracket (161) is a concave structure, and rollers (162) are provided at both ends of the bearing bracket (161), and the rollers (162) are driven to clamp and release by a pneumatic structure. The concave end in the middle of the bearing bracket (161) is provided with a support plate (163) perpendicular to the same plane as the bearing bracket (161), and the support plate (163) is connected to a hydraulic jacking structure.

6. A construction method for horizontal excavation of an anti-floating wall toe in a stone foundation pit according to claim 1 or 5, characterized in that: During the excavation of the foundation pit, after the excavation reaches the bottom plate (3), continue to excavate downward for 5-10 cm so that the side of the excavation is flush with the outer surface of the anti-floating wall toe (4).

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