WO2021190191A1 - Open caisson reverse slip forming guide controllable settlement construction mechanism and construction method - Google Patents

Abstract

Provided in the present invention are an open caisson reverse slip forming guide controllable settlement construction mechanism and construction method. Said construction mechanism comprises a ring beam, slip forming beams, an outer mold assembly and an inner mold assembly; the outer mold assembly comprises a first hanger beam and an outer mold plate; the inner mold assembly comprises a second hanger beam and an inner mold plate; the first hanger beam and the second hanger beam are both suspended below the slip forming beams; a well wall forming area is formed between the outer mold plate and the inner mold plate; and the bottom side of the well wall forming area is provided with a well wall blade foot. The construction method comprises: manufacturing a steel pipe pile, pouring a ring beam and installing an open caisson blade foot; installing a slip forming beam and an inner mold assembly and an outer mold assembly; placing reinforcing ribs, foam boards and glass fiber cloth; and forming an open caisson well wall and excavating soil stone in the well. In the open caisson reverse slip forming guide controllable settlement construction mechanism and construction method of the present invention, reverse slip forming is used in which the well wall slides and the molds do not move, greatly increasing the construction speed, reducing the conflict and interference between the manufacture of the well wall and the excavation of earthwork, reducing the construction cost, and effectively ensuring the quality of the open caisson construction.

Description

Construction mechanism and construction method for caisson reverse sliding form guided controllable settlement Technical field

The invention relates to the field of building construction, in particular to a caisson reverse sliding form guided controllable settlement construction mechanism and construction method.

Background technique

The development and utilization of urban underground space is an important way to alleviate the lack of urban land resources, improve environmental conditions, and enhance the quality of life of residents, and it has important practical significance. Caisson construction is a commonly used construction method in underground construction projects. Although traditional open caisson construction is widely used, it also has its insurmountable shortcomings:

1. Long construction period;

2. High construction technology requirements;

3. Quicksand during construction is prone to cause technical problems such as tilting of the caisson, difficulty in correcting the tilt of the caisson, and difficulty in sinking construction.

Analyzing the construction method of traditional caisson, it can be seen that the manufacturing process of repeated disassembly and assembly of scaffolding and formwork and shaft wall cannot be carried out simultaneously with excavation; at the same time, there is no settlement speed control method during the sinking process, and there is a lack of measures to prevent settlement; At the same time, large construction machinery is used in traditional caisson construction, resulting in large construction sites and high costs.

Summary of the invention

In order to solve the above technical problems, the present invention provides a caisson reverse slip form guide and controllable settlement construction mechanism and construction method. The reverse slip form method is adopted, that is, the shaft wall slides and the template does not move, which can greatly increase the construction speed and reduce The conflict and interference between shaft wall manufacturing and earth excavation are reduced, construction costs are reduced, and the construction quality of caisson is effectively ensured.

The technical solution adopted by the present invention to solve its technical problems is: a caisson reverse sliding form guided controllable settlement construction mechanism, including a ring beam; the top of the ring beam is provided with multiple slip form beams at positions close to the inner edge; There is a caisson excavation area in the middle of the structure composed of multiple slipform beams; the bottom of the slipform beam is suspended with an outer mold assembly and an inner mold assembly; the outer mold assembly includes a first hanger beam and An outer formwork fixed at the bottom of the first hanger beam; the inner form assembly includes a second hanger beam and an inner formwork fixed at the bottom of the second hanger beam; the first hanger beam and the second hanger beam All are suspended and fixed under the sliding form beam; the shaft wall forming area is formed between the outer template and the inner template; the shaft wall blade foot is provided on the bottom side of the shaft wall forming area; the shaft wall forming area is used for After the shaft foot sinks, the shaft wall is formed on the shaft foot.

Further, a plurality of steel pipe piles are preset on the outer side of the shaft wall blade; the steel pipe piles are used to provide guidance for the sinking of the shaft wall blade; the length of the steel pipe pile is not less than the designed sinker The depth of the well.

Further, the outer formwork is provided with a ring of hoop beams on the outside; the inner formwork is provided with a circle of support beams; Relax when sinking and demoulding are difficult to facilitate the sinking of the well wall.

Further, the inner formwork is provided with a platform on the second tightening beam for carrying construction personnel.

Further, a plurality of sliding form beams are fixed on the top of the ring beam by using a support seat.

Further, the ring beam is also provided with a plurality of hydraulic caisson control mechanisms; the driving end of the hydraulic caisson control mechanism is linked with a settlement control wire; the bottom end of the settlement control wire is connected to the shaft wall The bottom end of the shaft is fixed; multiple settlement control cables are used to jointly control the sinking speed of the shaft wall.

Further, when the shaft wall is formed in the shaft wall forming area, a shaft wall stiffener is installed in the shaft wall forming area; the shaft wall forming area is provided with a port area close to the inner template; the shaft wall The stiffener is provided with a stiffener joint in the port area, and the outer side of the port area is surrounded by a foam board. Portion grooves are formed in the area.

A caisson reverse sliding form guided and controllable settlement construction method, the specific method is:

S1: According to the design requirements of the drawings, determine the location of the designed caisson on the ground, and fabricate multiple steel pipe piles on the outside of the designed caisson wall, and the steel pipe piles are tangent to the outer wall of the designed caisson;

S2: Pour ring beams around the designed caisson, and arrange multiple support seats on the ring beams; among them, 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, and construct a retaining wall around the foundation pit, and place the edge of the caisson at the bottom of the foundation pit;

S4: Install the settlement control wire rope on the bottom side of the caisson blade, and install the hydraulic caisson control mechanism at the corresponding position of the ring beam, and assemble the settlement control wire rope and the hydraulic caisson control mechanism;

S5: Install slipform beams on multiple support seats, leaving a caisson excavation area between the structures formed by multiple slipform beams;

S6: Install the first hanger beam and the second hanger beam under the sliding form beam, and install the outer formwork and inner formwork correspondingly on the bottom side of the hanger beam; the inner diameter of the outer formwork and the outer diameter of the designed caisson Equal, 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 the caisson forming area above the edge of the caisson;

S7: There is a ring of hoop beams at the lower position on the outer side of the outer formwork, and a ring of support beams is installed at the lower position 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 hanger beam;

S9: According to the requirements of the drawings, bind the reinforcing ribs in the caisson forming area, and bind the reinforcing rib joints in the port area; then place the foam board in the port area according to the requirements of the drawings;

S10: Lay glass fiber mesh cloth on the forming surface of the caisson of the inner formwork and the outer formwork, and then carry out concrete pouring and excavate the earth and rocks in the caisson.

Further, in the S2 step, the ring beam trough is opened on the ground, the embedded parts are installed according to the requirements of the drawings, and the ring beam is poured.

Further, the layout form of the outer formwork and the inner formwork is determined according to the drawings, and is used to realize a circular caisson, a square caisson, a semicircular caisson, or an ellipse.

The advantages of the present invention: a caisson reverse sliding form guided controllable settlement construction mechanism and construction method of the present invention adopts reverse sliding form, that is, the shaft wall slides and the template does not move, which can greatly increase the construction speed and reduce the number of wells. Conflict and interference between wall manufacturing and earth excavation; external formwork and internal formwork are installed below the ground, and land is used as the main support, eliminating the need for scaffolding during construction and removing the scaffolding and dismantling links; using steel pipe piles for sinking Well-oriented, the use of steel cables for settlement control can well control the construction quality of the caisson; the use of foam board as a template to cast the joint ring groove can facilitate the subsequent connection construction and the connection of the reinforcing ribs; reduce the construction cost, and at the same time Effectively guarantee the construction quality of the caisson.

Description of the drawings

Fig. 1 is a schematic diagram of an embodiment of a caisson reverse sliding form guided controllable settlement construction mechanism;

Fig. 2 is a cross-sectional schematic diagram of a caisson forming area of a caisson reverse sliding form guided controllable settlement construction mechanism of an embodiment.

Detailed ways

In order to deepen the understanding of the present invention, the present invention will be further described in detail below with reference to 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.

Example

As shown in Figures 1 and 2, this embodiment provides a caisson reverse sliding form guided controllable settlement construction mechanism, which includes a ring beam 1; Form beam 2; a caisson excavation area is left in the middle of the structure composed of multiple slip form beams 2; the bottom of the slip form beam 2 is hung with an outer mold assembly and an inner mold assembly; the outer mold assembly includes The first hanger beam 3 and the outer formwork 5 fixed at the bottom of the first hanger beam 3; the inner form assembly includes a second hanger beam 4 and an inner formwork 6 fixed at the bottom of the second hanger beam 4; The first hanger beam 3 and the second hanger beam 4 are both suspended and fixed below the slide form beam 2; the outer formwork 5 and the inner formwork 6 form a shaft wall forming area; The bottom side is provided with a shaft wall cutting foot 13; the shaft wall forming area is used to form a shaft wall on the shaft wall cutting foot 13 after the shaft wall cutting foot 13 sinks.

In the construction mechanism for a caisson reverse sliding form guided controllable settlement of the present embodiment, a plurality of steel pipe piles 10 are preset on the outer side of the shaft foot 13; the steel pipe piles 10 are used for the shaft wall The sinking of the foot 13 provides guidance; the length of the steel pipe pile 10 is not less than the depth of the designed caisson.

In a caisson reverse sliding form guided controllable settlement construction mechanism of this embodiment, the outer formwork 5 is surrounded by a ring of tie beams 7; the inner formwork 6 is surrounded by a ring of support beams 8; The hoop beam 7 and the support beam 8 have the function of facilitating disassembly and assembly, and are used for relaxation when the shaft wall sinks and demoulding is difficult, so as to facilitate the shaft wall sinking.

In the construction mechanism for a caisson reverse sliding form guided controllable settlement of this embodiment, the inner formwork 6 is provided with a platform 9 on the second tightening beam 8 for carrying construction personnel.

In a caisson reverse sliding form guided controllable settlement construction mechanism of this embodiment, the two ends of the sliding form beam 2 are connected and fixed on the top of the ring beam by supporting seats 11.

In a caisson reverse sliding form guided controllable settlement construction mechanism of this embodiment, the ring beam 1 is also provided with a plurality of hydraulic caisson control mechanisms; the driving end of the hydraulic caisson control mechanism is connected with a settlement control Steel cable; The bottom end of the settlement control cable is fixed to the bottom end of the shaft foot 13; multiple settlement control cables are used to jointly control the sinking speed of the shaft wall.

In the construction mechanism for a caisson reverse sliding form guided controllable settlement of this embodiment, when the shaft wall is formed in the shaft wall forming zone, a shaft wall stiffener 15 is installed in the shaft wall forming zone; the shaft wall is formed The area is located close to the inner template 6 with a port area; the well wall stiffener is provided with a rib connection head in the port area, and the outer side of the port area is surrounded by a foam board 16, the foam board 16 is used to form a spout groove 14 at the stiffener spout area when the shaft wall is poured with concrete in the shaft wall forming area.

This embodiment also provides a caisson reverse sliding form guided and controllable settlement construction method. The specific method is as follows:

S1: According to the design requirements of the drawings, determine the position of the designed caisson on the ground 12, and make multiple steel pipe piles 10 outside the wall of the designed caisson. The steel pipe piles 10 and the outer wall of the designed caisson Tangent

S2: Pour ring beams around the designed caisson, and arrange multiple support seats on the ring beams; among them, the inner diameter of the ring beam is greater than the outer diameter of the designed caisson by more than 1 meter;

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, and construct a retaining wall around the foundation pit, and place the edge of the caisson at the bottom of the foundation pit;

S4: Install the settlement control wire rope on the bottom side of the caisson blade, and install the hydraulic caisson control mechanism at the corresponding position of the ring beam, and assemble the settlement control wire rope and the hydraulic caisson control mechanism;

S5: Install slipform beams on multiple support seats, leaving a caisson excavation area between the structures formed by multiple slipform beams;

S6: Install the first hanger beam and the second hanger beam under the sliding form beam, and install the outer formwork and inner formwork correspondingly on the bottom side of the hanger beam; the inner diameter of the outer formwork and the outer diameter of the designed caisson Equal, 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 the caisson forming area above the edge of the caisson;

S7: There is a ring of hoop beams at the lower position on the outer side of the outer formwork, and a ring of support beams is installed at the lower position 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 hanger beam;

S9: According to the requirements of the drawings, bind the reinforcing ribs in the caisson forming area, and bind the reinforcing rib joints in the port area; then place the foam board in the port area according to the requirements of the drawings;

S10: Lay glass fiber mesh cloth on the forming surface of the caisson of the inner formwork and the outer formwork, and then carry out concrete pouring and excavate the earth and rocks in the caisson.

In the construction method of the counter-slip form guided controllable settlement of the caisson in this embodiment, in the step S1, the number of steel pipe piles is designed according to the cross-sectional diameter of the caisson.

In the construction method of a caisson reverse sliding form guided controllable settlement of the present embodiment, in the step S2, the ring beam trough is opened on the ground, the embedded parts are installed according to the requirements of the drawing, and the ring beam is poured.

In this embodiment, the layout form of the outer and inner formwork is determined according to the drawings, and is used to realize circular caisson, square caisson, semicircular caisson, or elliptical shape construction.

The construction mechanism and construction method of a caisson reverse sliding form guided controllable settlement of this embodiment adopts the reverse sliding form method, that is, the shaft wall slides and the template does not move, which can greatly increase the construction speed and reduce the manufacturing and excavation of the shaft wall. Earthwork conflicts and interference; the external formwork and the internal formwork are installed below the ground, and the land is used as the main support, eliminating the need for scaffolding during construction, eliminating the construction and dismantling links of scaffolding; using steel pipe piles for caisson guidance, using The settlement control of the steel cable can well control the construction quality of the caisson; the use of foam board as a template for pouring the joint ring groove can facilitate the subsequent connection construction and the connection of the reinforcing ribs; reduce the construction cost while effectively ensuring the caisson Construction Quality.

The above-mentioned embodiments should not limit the present invention in any way, and all technical solutions obtained by equivalent substitution or equivalent conversion fall within the protection scope of the present invention.

Claims (10)

1. A caisson reverse sliding form guided controllable settlement construction mechanism, which is characterized in that it comprises a ring beam; the top of the ring beam is provided with multiple slip form beams near the inner edge; a structure composed of multiple slip form beams There is a caisson excavation area in the middle; the bottom of the sliding form beam is hoisted with an outer mold assembly and an inner mold assembly; the outer mold assembly includes a first hanger beam and a first hanger beam fixed at the bottom of the first hanger beam The outer formwork; the inner formwork assembly includes a second hanger beam and an inner formwork fixed at the bottom of the second hanger beam; the first hanger beam and the second hanger beam are both suspended and fixed on the sliding form beam Below; the outer template and the inner template form a well wall forming area; the bottom side of the well wall forming area is provided with a well wall blade foot; the well wall forming area is used to sink the shaft wall after the shaft foot The shaft wall is formed on the blade foot of the shaft wall.
2. A caisson reverse sliding form guided controllable settlement construction mechanism according to claim 1, wherein a plurality of steel pipe piles are preset on the outer side of the blade foot of the shaft wall; and the steel pipe piles are used for The sinking of the edge of the shaft wall provides guidance; the length of the steel pipe pile is not less than the depth of the designed caisson.
3. A caisson reverse sliding form guide and controllable settlement construction mechanism according to claim 1, characterized in that: the outer side of the outer formwork is provided with a ring of tie beams; the inner side of the inner formwork is provided with a ring of support The beam; the hoop beam and the support beam have the function of facilitating disassembly and assembly, and are used for relaxation when the shaft wall sinks and demoulding is difficult, and it is convenient for the shaft wall to sink.
4. A caisson reverse sliding form guided controllable settlement construction mechanism according to claim 3, characterized in that: the inner formwork is provided with a platform on the second tie beam for carrying construction personnel.
5. A caisson reverse sliding form guided controllable settlement construction mechanism according to claim 1, characterized in that: a plurality of sliding form beams are fixed on the top of the ring beams by supporting seats.
6. A caisson reverse sliding form guided controllable settlement construction mechanism according to claim 1, characterized in that: the ring beam is also provided with a plurality of hydraulic caisson control mechanisms; the drive of the hydraulic caisson control mechanism A settlement control steel cable is connected to the end; the bottom end of the settlement control steel cable is fixed to the bottom end of the shaft wall blade foot; a plurality of settlement control steel cables are used to jointly control the sinking speed of the shaft wall.
7. The construction mechanism for a caisson reverse sliding form guided controllable settlement according to claim 1, characterized in that: when the shaft wall is formed in the shaft wall forming area, a shaft wall stiffener is installed in the shaft wall forming area; The well wall forming area is provided with a port area near the inner template; the well wall reinforcing rib is provided with a reinforcing rib connection head in the port area, and the outer side of the port area is surrounded by a foam board, so The foam board is used to form a spout groove at the spout area of the reinforcing rib when the shaft wall is poured with concrete in the shaft wall forming area.
8. A caisson reverse sliding form guided and controllable settlement construction method is characterized in that: the specific method is:

   S1: According to the design requirements of the drawings, determine the location of the designed caisson on the ground, and make multiple steel pipe piles on the outside of the designed caisson wall, and the steel pipe piles are tangent to the outer wall of the designed caisson;

   S2: Pour ring beams around the designed caisson, and arrange multiple support seats on the ring beams; among them, 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, and construct a retaining wall around the foundation pit, and place the edge of the caisson at the bottom of the foundation pit;

   S4: Install the settlement control wire rope on the bottom side of the caisson blade, and install the hydraulic caisson control mechanism at the corresponding position of the ring beam, and assemble the settlement control wire rope and the hydraulic caisson control mechanism;

   S5: Install slipform beams on multiple support seats, leaving a caisson excavation area between the structures formed by multiple slipform beams;

   S6: Install the first hanger beam and the second hanger beam under the sliding form beam, and install the outer formwork and inner formwork correspondingly on the bottom side of the hanger beam; the inner diameter of the outer formwork and the outer diameter of the designed caisson Equal, 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 the caisson forming area above the edge of the caisson;

   S7: There is a ring of hoop beams at the lower position on the outer side of the outer formwork, and a ring of support beams is installed at the lower position 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 hanger beam;

   S9: According to the requirements of the drawings, bind the reinforcing ribs in the caisson forming area, and bind the reinforcing rib joints in the port area; then place the foam board in the port area according to the requirements of the drawings;

   S10: Lay glass fiber mesh cloth on the forming surface of the caisson of the inner formwork and the outer formwork, and then carry out concrete pouring and excavate the earth and rocks in the caisson.
9. The construction method of a caisson reverse sliding form guided controllable settlement according to claim 8, characterized in that: in the S2 step, a control ring beam trough is opened on the ground, and the embedded parts are installed according to the requirements of the drawings, and then Pouring ring beams.
10. A caisson reverse sliding form guided and controlled settlement construction method according to claim 8, characterized in that: the layout of the outer formwork and the inner formwork is determined according to the drawings, and is used to realize circular caisson and square caisson. , Semi-circular caisson or oval shaped construction.

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