A construction mechanism and construction method for controlled settlement of a caisson by reverse sliding formwork with guidance

Abstract

The present invention provides a construction mechanism and construction method for reverse sliding formwork guiding and controllable settlement of a caisson, including a ring beam, a sliding formwork beam, an outer formwork assembly, and an inner formwork assembly; the outer formwork assembly includes a first hanging beam and an outer formwork; the inner formwork assembly includes a second hanging beam and an inner formwork; both the first hanging beam and the second hanging beam are suspended below the sliding formwork beam; a well wall forming area is formed between the outer formwork and the inner formwork; a well wall cutting edge is provided at the bottom side of the well wall forming area. Construction method: fabricate steel pipe piles, pour the ring beam, and install the caisson cutting edge; install the sliding formwork beam and the inner and outer formwork assemblies; lay reinforcing bars, foam boards, and fiberglass cloth; form the caisson well wall and excavate the soil and rock inside the well. The construction mechanism and construction method for reverse sliding formwork guiding and controllable settlement of a caisson according to the present invention adopt the reverse sliding formwork method, with the well wall sliding and the formwork remaining stationary, which can greatly improve the construction speed, reduce the conflict and interference between well wall manufacturing and earth excavation, reduce construction costs, and effectively ensure the construction quality of the caisson at the same time.

Description

Technical Field

[0001] The present invention relates to the field of building construction, and in particular to a construction mechanism and construction method for a caisson reverse sliding formwork guided controllable settlement. Background Art

[0002] The development and utilization of urban underground space is an important way to alleviate the shortage of urban land resources, improve the environmental conditions, and enhance the living quality of residents, and has important practical significance. Caisson construction is a commonly used construction method for underground construction projects. Although traditional caisson construction is widely used, it also has its insurmountable disadvantages:

[0003] 1. The construction period is relatively long;

[0004] 2. The construction technology requirements are high;

[0005] 3. Technical problems such as quicksand are likely to occur during construction, resulting in caisson inclination, difficulty in correcting caisson inclination, and difficulty in sinking construction.

[0006] Analysis of the traditional caisson construction method shows that: in the traditional method, the repeated disassembly and assembly of the scaffolding and formwork and the manufacturing process of the caisson wall cannot be carried out simultaneously with the excavation; at the same time, there is no method for controlling the settlement speed during the sinking process, and there are no measures to prevent deviation; at the same time, large construction machinery is used in traditional caisson construction, resulting in a large construction site and high costs. Summary of the Invention

[0007] To solve the above technical problems, the present invention provides a construction mechanism and construction method for a caisson reverse sliding formwork guided controllable settlement. By adopting the reverse sliding formwork method, that is, the caisson wall slides and the formwork does not move, the construction speed can be greatly improved, the conflict and interference between the caisson wall manufacturing and earth excavation are reduced, the construction cost is reduced, and at the same time, the construction quality of the caisson is effectively guaranteed.

[0008] The technical solution adopted by the present invention to solve its technical problems is: a construction mechanism for a caisson reverse sliding formwork guided controllable settlement, including a ring beam; a plurality of sliding formwork beams are erected at the top of the ring beam near the inner edge; a caisson excavation area is left in the middle of the structure formed by the plurality of sliding formwork beams; an outer formwork assembly and an inner formwork assembly are suspended at the bottom of the sliding formwork beam; the outer formwork assembly includes a first hanging beam and an outer formwork fixed at the bottom of the first hanging beam; the inner formwork assembly includes a second hanging beam and an inner formwork fixed at the bottom of the second hanging beam; both the first hanging beam and the second hanging beam are suspended and fixed below the sliding formwork beam; a caisson wall forming area is formed between the outer formwork and the inner formwork; a caisson wall cutting edge is arranged at the bottom side of the caisson wall forming area; the caisson wall forming area is used for forming a caisson wall on the caisson wall cutting edge after the caisson wall cutting edge sinks.

[0009] Furthermore, a plurality of steel pipe piles are pre - installed on the outer side of the cutting edge of the well wall; the steel pipe piles are used to provide guidance for the sinking of the cutting edge of the well wall; the length of the steel pipe piles is not less than the depth of the designed open caisson.

[0010] Furthermore, a hoop beam is arranged around the outer side of the outer formwork; a support beam is arranged around the inner side of the inner formwork; the hoop beam and the support beam have the function of being convenient for disassembly and assembly, and are used to be relaxed when it is difficult to remove the formwork during the sinking of the well wall, so as to facilitate the sinking of the well wall.

[0011] Furthermore, a platform is installed on the second hoop beam of the inner formwork for carrying construction workers.

[0012] Furthermore, a plurality of slip form beams are fixed on the top of the ring beam by support seats.

[0013] Furthermore, a plurality of hydraulic open caisson control mechanisms are also arranged on the ring beam; the driving end of the hydraulic open caisson control mechanism is linked with a settlement control steel cable; the bottom end of the settlement control steel cable is fixed to the bottom end of the cutting edge of the well wall; a plurality of settlement control steel cables are used to jointly control the sinking speed of the well wall.

[0014] Furthermore, when the well wall forming area forms the formed well wall, well wall reinforcement bars are installed in the well wall forming area; a batching area is arranged at a position close to the inner formwork in the well wall forming area; the well wall reinforcement bars are provided with reinforcement bar connection joints in the batching area, and a foam board is arranged around the outside of the batching area. The foam board is used to form a batching groove at the reinforcement bar batching area when pouring concrete in the well wall forming area to form the well wall.

[0015] An inverse slip - form guided controllable settlement construction method for an open caisson, the specific method is as follows:

[0016] S1: According to the requirements of the drawing design, determine the position of the designed open caisson on the ground, and make a plurality of steel pipe piles on the outer side of the well wall of the designed open caisson, and the steel pipe piles are tangent to the outer wall of the designed open caisson;

[0017] S2: Pour a ring beam around the designed open caisson, and arrange a plurality of support seats on the ring beam; among them, the inner diameter of the ring beam is larger than the outer diameter of the designed open caisson;

[0018] S3: Excavate a foundation pit along the inner diameter of the ring beam, the depth of the foundation pit corresponds to the height of the outer formwork, construct a retaining wall around the foundation pit, and place the cutting edge of the open caisson at the bottom of the foundation pit;

[0019] S4: Install a settlement control steel cable on the bottom side of the cutting edge of the open caisson, install a hydraulic open caisson control mechanism at the corresponding position of the ring beam, and assemble the settlement control steel cable and the hydraulic open caisson control mechanism;

[0020] S5: Install slip form beams on a plurality of support seats, and leave an open caisson excavation area between the structures formed by the plurality of slip form beams;

[0021] S6: Install the first hanging beam and the second hanging beam under the slip form beam, and correspondingly install the outer formwork and the inner formwork on the bottom side of the hanging beam; the inner diameter of the outer formwork is equal to the outer diameter of the designed open caisson, and the inner diameter of the inner formwork is equal to the inner diameter of the designed open caisson; the outer formwork and the inner formwork form an open caisson forming area above the open caisson cutting edge.

[0022] S7: A hoop beam is connected at a position near the lower part on the outer side of the outer formwork, and a support beam is installed at a position near the lower part on the inner side of the inner formwork.

[0023] S8: Build a platform on the inner side of the inner formwork through the support beam and the second hanging beam.

[0024] S9: According to the requirements of the drawings, tie the reinforcing bars in the open caisson forming area, and bind the reinforcing bar joints in the barge area; then, place the foam board in the barge area according to the requirements of the drawings.

[0025] S10: Lay fiberglass mesh cloth on the forming surface of the open caisson of the inner formwork and the outer formwork, and then, carry out concrete pouring and excavate the soil and stone in the open caisson.

[0026] Further, in the step S2, excavate the ring beam trench on the ground, install the embedded parts according to the requirements of the drawings, and then pour the ring beam.

[0027] Further, the layout form of the outer formwork and the inner formwork is determined according to the drawings, and is used to realize the forming construction of a circular open caisson, a square open caisson, a semi-circular open caisson or an oval one.

[0028] Advantages of the present invention: For an open caisson reverse slip form guiding and controllable settlement construction mechanism and construction method of the present invention, the reverse slip form method is adopted, that is, the well wall slides and the formwork does not move, which can greatly improve the construction speed and reduce the conflict and interference between the well wall manufacturing and the excavation of earthwork; the outer formwork and the inner formwork are installed below the ground, using the land as the main support, saving the scaffolding in the construction and removing the construction and demolition links of the scaffolding; using steel pipe piles for open caisson guiding and steel cables for settlement control, the construction quality of the open caisson can be well controlled; using foam board as the formwork to pour the barge ring groove can facilitate the subsequent connection construction and the continuation of the reinforcing bars; reducing the construction cost and effectively ensuring the construction quality of the open caisson. Brief Description of the Drawings

[0029] Figure 1 It is a schematic diagram of an open caisson reverse slip form guiding and controllable settlement construction mechanism for an embodiment;

[0030] Figure 2 It is a cross-sectional schematic diagram of the open caisson forming area of an open caisson reverse slip form guiding and controllable settlement construction mechanism for an embodiment. Detailed Embodiment

[0031] To deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. The embodiments are only used to explain the present invention and do not limit the protection scope of the present invention.

[0032] Embodiment

[0033] As Figure 1 and Figure 2 shown, this embodiment provides a construction mechanism for controlled settlement of a caisson with reverse sliding formwork and guidance, including a ring beam 1; a plurality of sliding formwork beams 2 are erected at the top of the ring beam 1 near the inner edge; a caisson excavation area is left in the middle of the structure formed by the plurality of sliding formwork beams 2; an outer formwork assembly and an inner formwork assembly are suspended at the bottom of the sliding formwork beam 2; the outer formwork assembly includes a first hanging beam 3 and an outer formwork 5 fixed to the bottom of the first hanging beam 3; the inner formwork assembly includes a second hanging beam 4 and an inner formwork 6 fixed to the bottom of the second hanging beam 4; both the first hanging beam 3 and the second hanging beam 4 are suspended and fixed below the sliding formwork beam 2; a well wall forming area is formed between the outer formwork 5 and the inner formwork 6; a well wall cutting edge 13 is provided at the bottom side of the well wall forming area; the well wall forming area is used to form a well wall on the well wall cutting edge 13 after the well wall cutting edge 13 sinks.

[0034] In the construction mechanism for controlled settlement of a caisson with reverse sliding formwork and guidance of this embodiment, a plurality of steel pipe piles 10 are pre-arranged outside the well wall cutting edge 13; the steel pipe piles 10 are used to provide guidance for the sinking of the well wall cutting edge 13; the length of the steel pipe piles 10 is not less than the depth of the designed caisson.

[0035] In the construction mechanism for controlled settlement of a caisson with reverse sliding formwork and guidance of this embodiment, a hoop beam 7 is arranged around the outside of the outer formwork 5; a support beam 8 is arranged around the inside of the inner formwork 6; the hoop beam 7 and the support beam 8 have the function of being convenient for disassembly and assembly, and are used to be loosened when it is difficult to demold the well wall during sinking, so as to facilitate the sinking of the well wall.

[0036] In the construction mechanism for controlled settlement of a caisson with reverse sliding formwork and guidance of this embodiment, a platform 9 is installed on the second hoop beam 8 of the inner formwork 6 for carrying construction workers.

[0037] In the construction mechanism for controlled settlement of a caisson with reverse sliding formwork and guidance of this embodiment, both ends of the sliding formwork beam 2 are connected and fixed to the top of the ring beam by support seats 11.

[0038] In the construction mechanism for controlled settlement of a caisson with reverse sliding formwork and guidance of this embodiment, a plurality of hydraulic caisson control mechanisms are further arranged on the ring beam 1; the driving end of the hydraulic caisson control mechanism is linked with a settlement control steel cable; the bottom end of the settlement control steel cable is fixed to the bottom end of the well wall cutting edge 13; a plurality of settlement control steel cables are used to jointly control the sinking speed of the well wall.

[0039] In a construction mechanism for controlled settlement of a caisson with reverse sliding formwork and guidance in this embodiment, when forming the well wall in the well wall forming area, a well wall reinforcement 15 is installed in the well wall forming area; a batching area is arranged at a position close to the inner formwork 6 in the well wall forming area; the well wall reinforcement is provided with a reinforcement joint in the batching area, and a foam board 16 is arranged around the outside of the batching area. The foam board 16 is used to form a batching groove 14 at the reinforcement batching area when pouring concrete in the well wall forming area to form the well wall.

[0040] This embodiment also provides a construction method for controlled settlement of a caisson with reverse sliding formwork and guidance. The specific method is as follows:

[0041] S1: According to the requirements of the drawing design, determine the position of the designed caisson on the ground 12, and make a plurality of steel pipe piles 10 on the outer side of the well wall of the designed caisson. The steel pipe piles 10 are tangent to the outer wall of the designed caisson.

[0042] S2: Pour a ring beam around the designed caisson, and arrange a plurality of support seats on the ring beam; among them, the inner diameter of the ring beam is more than 1 meter larger than the outer diameter of the designed caisson.

[0043] S3: Excavate a foundation pit along the inner diameter of the ring beam. The depth of the foundation pit corresponds to the height of the outer formwork, construct a retaining wall around the foundation pit, and place the caisson cutting edge at the bottom of the foundation pit.

[0044] S4: Install a settlement control steel cable on the bottom side of the caisson cutting edge, install a hydraulic caisson control mechanism at the corresponding position of the ring beam, and assemble the settlement control steel cable with the hydraulic caisson control mechanism.

[0045] S5: Install sliding formwork beams on a plurality of support seats, and leave a caisson excavation area between the structures formed by the plurality of sliding formwork beams.

[0046] S6: Install a first hanging beam and a second hanging beam under the sliding formwork beam, and correspondingly install an outer formwork and an inner formwork at the bottom side of the hanging beam; the inner diameter of the outer formwork is equal to the outer diameter of the designed caisson, and the inner diameter of the inner formwork is equal to the inner diameter of the designed caisson; the outer formwork and the inner formwork form a caisson forming area above the caisson cutting edge.

[0047] S7: A hoop beam is connected at a position close to the lower part on the outer side of the outer formwork, and a support beam is installed at a position close to the lower part on the inner side of the inner formwork.

[0048] S8: Build a platform on the inner side of the inner formwork through the support beam and the second hanging beam.

[0049] S9: According to the requirements of the drawing, tie the reinforcement in the caisson forming area and tie the reinforcement joint in the batching area; then, place the foam board in the batching area according to the requirements of the drawing.

[0050] S10: Lay fiberglass mesh cloth on the sinking well forming surfaces of the inner formwork and the outer formwork, then, conduct concrete pouring and excavate the soil and stones inside the sinking well.

[0051] In the construction method of reverse sliding formwork guided controllable settlement of a sinking well in this embodiment, in the S1 step, the number of steel pipe piles is designed according to the cross-sectional diameter of the sinking well.

[0052] In the construction method of reverse sliding formwork guided controllable settlement of a sinking well in this embodiment, in the S2 step, excavate the ring beam trench on the ground, install the embedded parts according to the drawing requirements, and then pour the ring beam.

[0053] In this embodiment, the layout forms of the outer formwork and the inner formwork are determined according to the drawings, and are used to realize the forming construction of circular sinking wells, square sinking wells, semi-circular sinking wells or oval shapes.

[0054] The construction mechanism and construction method of reverse sliding formwork guided controllable settlement of a sinking well in this embodiment adopt the reverse sliding formwork method, that is, the well wall slides and the formwork does not move, which can greatly improve the construction speed and reduce the conflict and interference between the well wall manufacturing and the excavation of earthwork; the outer formwork and the inner formwork are installed below the ground, using the land as the main support, eliminating the scaffolding in the construction and removing the construction and demolition links of the scaffolding; using steel pipe piles for sinking well guidance and steel cables for settlement control can well control the construction quality of the sinking well; using foam boards as formwork to pour the butt joint ring groove can facilitate subsequent connection construction and the continuation of the reinforcement bars; reducing the construction cost and effectively ensuring the construction quality of the sinking well at the same time.

[0055] The above embodiments should not limit the present invention in any way. All technical solutions obtained by using equivalent replacements or equivalent conversions fall within the protection scope of the present invention.

Claims

1. A construction mechanism for reverse slip formwork guiding and controllable settlement of a caisson, characterized in that: it includes a ring beam; a plurality of slip formwork beams are erected on the top of the ring beam near the inner edge; a caisson excavation area is left in the middle of the structure formed by the plurality of slip formwork beams; an outer formwork assembly and an inner formwork assembly are suspended at the bottom of the slip formwork beams; the outer formwork assembly includes a first hanging beam and an outer formwork fixed to the bottom of the first hanging beam; the inner formwork assembly includes a second hanging beam and an inner formwork fixed to the bottom of the second hanging beam; both the first hanging beam and the second hanging beam are suspended and fixed below the slip formwork beams; a well wall forming area is formed between the outer formwork and the inner formwork; a well wall cutting edge is arranged at the bottom side of the well wall forming area; the well wall forming area is used for forming a well wall on the well wall cutting edge after the well wall cutting edge sinks; a hoop beam is arranged around the outer side of the outer formwork; a support beam is arranged around the inner side of the inner formwork; the hoop beam and the support beam have the function of being convenient for disassembly and assembly, and are used for relaxation when it is difficult to remove the formwork during the sinking of the well wall, so as to facilitate the sinking of the well wall; a plurality of steel pipe piles are pre-embedded on the outer side of the well wall cutting edge; the steel pipe piles are used to provide guidance for the sinking of the well wall cutting edge; the length of the steel pipe piles is not less than the depth of the designed caisson; a platform is installed on the inner formwork on the second hoop beam for carrying construction workers; a plurality of slip formwork beams are fixed on the top of the ring beam by support seats; a plurality of hydraulic caisson control mechanisms are also arranged on the ring beam; the driving end of the hydraulic caisson control mechanism is linked with a settlement control steel cable; the bottom end of the settlement control steel cable is fixed to the bottom end of the well wall cutting edge; a plurality of settlement control steel cables are used to jointly control the sinking speed of the well wall.

2. A construction mechanism for reverse slip formwork guiding and controllable settlement of a caisson according to claim 1, characterized in that: when forming the well wall in the well wall forming area, well wall reinforcement bars are installed in the well wall forming area; a batching area is arranged at a position near the inner formwork in the well wall forming area; the well wall reinforcement bars are provided with reinforcement bar connection heads in the batching area, and a foam board is arranged around the outside of the batching area, and the foam board is used for forming a batching groove at the reinforcement bar batching area when pouring concrete in the well wall forming area to form the well wall.

3. A construction method for reverse slip formwork guiding and controllable settlement of a caisson, characterized in that: the specific method is as follows: S1: According to the requirements of the drawing design, determine the position of the designed caisson on the ground, and make a plurality of steel pipe piles on the outer side of the well wall of the designed caisson, and the steel pipe piles are tangent to the outer wall of the designed caisson; S2: Pour a ring beam around the designed caisson, and arrange a plurality of support seats on the ring beam; wherein, the inner diameter of the ring beam is larger than the outer diameter of the designed caisson; S3: Dig a foundation pit along the inner diameter of the ring beam, the depth of the foundation pit corresponds to the height of the outer formwork, construct a retaining wall around the foundation pit, and place a caisson cutting edge at the bottom of the foundation pit; S4: Install a settlement control steel cable at the bottom side of the caisson cutting edge, install a hydraulic caisson control mechanism at the corresponding position of the ring beam, and assemble the settlement control steel cable and the hydraulic caisson control mechanism; S5: Install slip formwork beams on a plurality of support seats, and leave a caisson excavation area between the structures formed by the plurality of slip formwork beams; S6: Install the first hanging beam and the second hanging beam under the slip form beam, and correspondingly install the outer formwork and the inner formwork on the bottom side of the hanging beam; the inner diameter of the outer formwork is equal to the outer diameter of the designed open caisson, and the inner diameter of the inner formwork is equal to the inner diameter of the designed open caisson; the outer formwork and the inner formwork form an open caisson forming area above the open caisson cutting edge. S7: A hoop beam is connected at a position near the lower part on the outer side of the outer formwork, and a support beam is installed at a position near the lower part on the inner side of the inner formwork. S8: Build a platform on the inner side of the inner formwork through the support beam and the second hanging beam. S9: According to the requirements of the drawing, tie the reinforcing bars in the open caisson forming area, and bind the reinforcing bar joints in the barge area; then, place the foam board in the barge area according to the requirements of the drawing. S10: Lay fiberglass mesh cloth on the forming surfaces of the inner formwork and the outer formwork of the open caisson, and then, carry out concrete pouring and excavate the soil and stone in the open caisson.

4. A construction method for reverse slip form guiding and controllable settlement of an open caisson according to claim 3, characterized in that: In the step S2, excavate the ring beam trench on the ground, install the embedded parts according to the requirements of the drawing, and then pour the ring beam.

5. A construction method for reverse slip form guiding and controllable settlement of an open caisson according to claim 3, characterized in that: The layout form of the outer formwork and the inner formwork is determined according to the drawing, and is used to realize the forming construction of a circular open caisson, a square open caisson, a semi-circular open caisson or an elliptical one.

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