CN216892488U

CN216892488U - Counter-force supporting device for open caisson bottom sealing

Info

Publication number: CN216892488U
Application number: CN202123183455.6U
Authority: CN
Inventors: 金程; 周朝阳; 谢含军; 孔佳伟
Original assignee: Ningbo Municipal Engineering Construction Group Co Ltd
Current assignee: Ningbo Municipal Engineering Construction Group Co Ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-07-05
Anticipated expiration: 2031-12-17

Abstract

The utility model discloses a counter-force supporting device for bottom sealing of an open caisson, which relates to a building apparatus and comprises a chassis and a plurality of supporting rods arranged on the chassis, and is characterized in that the supporting rods comprise a bottom plate connecting section, a supporting section and a side plate section, the supporting section comprises a plurality of spliced standard sections, the standard sections are rigidly connected, the side plate section is attached to the inner side wall of the open caisson, and the bottom plate connecting section is rotatably connected with the chassis. Compared with the prior art, the thickness of back cover concrete can be effectively reduced through the application. Taking an open caisson with an inner diameter of 5m as an example, the structure form is changed from simple support to continuous form by applying support at the middle part, the maximum bending moment value of the structure is 1/3 when the structure is unsupported, and the shear force is 3/5 when the structure is unsupported, so that the thickness of the bottom sealing concrete can be reduced by 40 percent, the material is saved, the cost is reduced, and the counter force support device can be adjusted according to open caisson with different sizes.

Description

Counter-force supporting device for open caisson bottom sealing

Technical Field

The utility model relates to a building apparatus, in particular to a building apparatus for open caisson construction.

Background

The open caisson is a structure for constructing underground engineering and deep foundation, and is generally used for constructing foundation pits of large-scale piers, sewage pump stations, large-scale equipment foundations, civil air defense shelters, shield assembly wells, and retaining devices for underground driveways and station hydraulic foundation construction. The open caisson is made of reinforced concrete on the ground into a shaft shape to be used as a support of a pit wall of a foundation pit, earth is dug in the open caisson mechanically and manually under the protection of the well wall, the open caisson is sunk into the earth under the action of self weight, the bottom of the open caisson is not closed in the sinking process due to the sinking construction requirement of the open caisson, and the bottom sealing is carried out after the open caisson is sunk in place. After the open caisson is in place, the bottom and the ground have height difference, the open caisson supported by the well wall is equivalent to a simply supported structure according to a stress structure, the bottom sealing of the open caisson needs to bear the buoyancy of water and the soil pressure, the bottom sealing of the open caisson usually adopts concrete, and in order to meet the requirement on strength, the thickness of the bottom sealing concrete reaches several meters, the material consumption is large, and the cost is higher.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects in the prior art, the utility model provides a counter-force supporting device, which applies supporting force to the middle part in a counter-force supporting mode to change the structure stress form from simple support to continuous, taking a sunk well with the inner diameter of 5m as an example, so that the maximum bending moment value of the structure is 1/3 when the structure is unsupported, the shearing force is 3/5 when the structure is unsupported, the thickness of bottom sealing concrete can be reduced by 40%, the bottom sealing concrete material is saved, the integral construction cost is reduced, and the counter-force supporting mode can be adjusted according to sunk wells with different sizes and can be repeatedly utilized.

In order to solve the technical problems, the utility model is solved by the following technical scheme: the utility model provides a counter-force strutting arrangement, includes the chassis and sets up a plurality of bracing piece on the chassis, the bracing piece include bottom plate linkage segment, support section and curb plate section, the support section include the standard section that a plurality of sections can splice, rigid connection between the standard section, the curb plate section pastes and leans on at the open caisson inside wall, the bottom plate linkage segment rotate to be connected the chassis.

Preferably, in the above technical scheme, the base plate comprises a connecting plate matched with the supporting rod, and the connecting plate is provided with a connecting hole.

Preferably, the bottom plate connecting section comprises a double-strand plate matched with the connecting plate, and the double-strand plate is fixed on the connecting hole through a pin shaft.

In the above technical solution, preferably, the standard section is provided with connecting plates on both sides thereof, and the standard section fixes other standard sections or the bottom plate connecting section or the side plate section through the connecting plates.

Preferably among the above-mentioned technical scheme, the curb plate section include the curb plate, the curb plate on be provided with the side connecting plate, the side connecting plate on be provided with the side connecting hole, still include the main part case, the main part case on be provided with the side double-stranded board, the side double-stranded board pass through the bolt fastening and be in the side connecting hole on.

Preferably among the above-mentioned technical scheme, still including adjusting the section, the regulation section include the steel pipe main part, the steel pipe main part in be provided with the internal thread, the steel pipe main part in still be provided with the control tube that has the external screw thread, it is provided with the connecting plate to adjust section both sides, adjust the section and pass through the connecting plate fixed other standard section or bottom plate linkage segment or side plate section.

Preferably, in the above technical solution, the standard segment includes a long standard segment and a short standard segment.

The utility model belongs to an open caisson construction method, the process flow firstly carries out the manufacturing of the open caisson according to the conventional flow, the open caisson structure does not need to be reformed, and the open caisson is sunk by the conventional method after the manufacturing is finished. And after the open caisson is sunk to the designed position, temporarily not discharging water in the open caisson, and keeping the whole stability of the open caisson. And at the moment, carrying out stress analysis and calculation according to the size of the open caisson and the water level in the open caisson to obtain the size of the counter-force supporting device and the actual bottom-sealing concrete quantity demand. And then, pouring bottom sealing concrete to carry out open caisson bottom sealing operation. Install counter-force strutting arrangement immediately after back cover concrete thickness reaches the requirement, at first carry out the primary installation with whole counter-force strutting arrangement according to the size of open caisson, then place the plane central point at back cover concrete top with counter-force strutting arrangement's chassis and put, the top of bracing piece supports on the wall of a well, carries out the fine tuning of bracing piece again, according to the distance of center to wall of a well four sides and the angle of bracing piece, makes the bracing piece top accomplish the installation tightly. After the strength of bottom sealing concrete reaches design requirements, water in the caisson is pumped out, bottom plate construction is carried out, steel bars are bound according to drawing requirements, the steel bars cannot be bound at the chassis position of the counter-force supporting device temporarily, the overlap joint length of the steel bars is reserved in advance, the counter-force supporting device is removed at last, the steel bars at the chassis position are supplemented, the concrete bottom plate begins to be poured immediately, and after pouring is completed, concrete is maintained, namely the bottom sealing of the whole caisson is completed.

The back section of thick bamboo wall receives the pressure of outside soil and the pressure of inside water after the open caisson sinks, realizes the approximate balance of power, so the back closed end concrete need be thick enough after the drainage, and this application then replaces partial closed end concrete through counter-force strutting arrangement, accomplishes the power balance after drawing water jointly through closed end concrete and counter-force strutting arrangement, and the thickness of actual closed end concrete can reduce like this, and counter-force strutting arrangement can reuse.

Compared with the prior art, the thickness of back cover concrete can be effectively reduced through the application. Taking an open caisson with an inner diameter of 5m as an example, the structure form is changed from simple support to continuous form by applying support at the middle part, the maximum bending moment value of the structure is 1/3 when the structure is unsupported, and the shear force is 3/5 when the structure is unsupported, so that the thickness of the bottom sealing concrete can be reduced by 40 percent, the material is saved, the cost is reduced, and the counter force support device can be adjusted according to open caisson with different sizes.

Drawings

FIG. 1 is a schematic view of the bottom sealing and pouring steps of the present invention.

FIG. 2 is a schematic view showing the installation procedure of the reaction force supporting device of the present invention.

Fig. 3 is a schematic view of a reinforcing bar binding step according to the present invention.

FIG. 4 is a schematic view of the step of pouring the bottom plate according to the present invention.

FIG. 5 is a schematic view of the reaction force supporting device of the present invention.

FIG. 6 is a schematic view of the chassis of the reaction force supporting device of the present invention.

FIG. 7 is a schematic view of the bottom plate connection section of the reaction force supporting device of the present invention.

FIG. 8 is a schematic view of a long standard section of the reaction force supporting device of the present invention.

FIG. 9 is a schematic view of a short standard segment of the reaction force supporting device of the utility model.

FIG. 10 is a schematic view of the adjustment section of the reaction force supporting device of the present invention.

FIG. 11 is a schematic view of a side plate section of the reaction force supporting device of the present invention.

Detailed Description

Example 1: as shown in fig. 1 to 4, in a bottom sealing construction method of a counter-force supported open caisson, the specification of the open caisson 101 is a rectangular open caisson of 7m × 5 m. And (3) manufacturing and sinking the open caisson according to a conventional open caisson process, wherein the open caisson 101 adopts a non-drainage sinking mode, and the open caisson bottom sealing operation can be performed after the open caisson is sunk to a design position. The water level 102 in the caisson is maintained without draining water during the bottom sealing process, which is beneficial to the stability of the caisson 101. Pouring the bottom sealing concrete onto the bottom sediment 103, wherein the bottom sealing concrete generally adopts underwater concrete, and installing the counter force supporting device 105 is started after the concrete is poured to the designed position to form a bottom seal 104. To facilitate the installation of the reaction support device 105, the preliminary dimensions of the reaction support device 105 are first determined by geometrical calculations based on the dimensions of the open caisson 101, and a preliminary assembly is performed, which facilitates the overall installation of the device. Counter-force strutting arrangement 105 is transferred to back cover 104 top surface plane center, and the plane central point that back cover 104 top was placed to the chassis puts, expandes the bracing piece after that, makes its top push up to the wall of a well of open caisson 101, and the regulation section through the bracing piece carries out the fine setting and pushes up tightly, lets strutting arrangement fix the top surface at back cover 104 and plays the supporting role. After the supporting device is installed, after the bottom sealing 104 reaches the designed strength, the water in the open caisson 101 is pumped out, and the bottom plate is irrigated. Firstly, binding the reinforcing steel bars 106 of the bottom plate, temporarily not binding the reinforcing steel bars at the bottom plate position of the reaction force supporting device 105, and after finishing binding the reinforcing steel bars at other positions, removing the reaction force supporting device 105 and supplementing the reinforcing steel bars at the position of the chassis. And pouring bottom plate concrete to form a bottom plate 107, and then performing concrete curing to complete the whole open caisson bottom sealing operation.

As shown in FIGS. 5 to 11, a reaction force supporting device 105 is composed of a base plate 1, a bottom plate connecting section 2, a long standard section 3, a short standard section 4, an adjusting section 5, and a side plate section 6.

The chassis 1 is composed of a connecting plate 1-1 and a steel bottom plate 1-2, the connecting plate 1-1 is used for being connected with a bottom plate connecting section 2, holes are formed in the connecting plate, the steel bottom plate 1-2 is a contact surface and an action surface of the reverse supporting device 105 and a concrete back cover, and in the embodiment, the connecting plate 1-1 is uniformly and circumferentially arranged on the steel bottom plate 1-2.

The bottom plate connecting section 2 is composed of a pin shaft 2-1, a double-strand plate 2-2, a main box body section 2-3 and a square connecting end plate 2-4, the pin shaft 2-1 is of a cylindrical structure and used for connecting the double-strand plate 2-2 with a connecting plate 1-1, the diameter ratio of the pin shaft to the connecting plate is slightly smaller than that of a round hole of the connecting plate, the double-strand plate 2-2 is composed of two steel plates with a round front section and a round back end, the round hole is formed in the front section, the size of the round hole is consistent with that of the round hole of the connecting plate 1-1, the back end of the round pin shaft is connected with the main box body section 2-3, the main box body section 2-3 is of a hollow box body structure, the square connecting end plate 2-4 is a connecting and fixing device between the sections, and the connecting end plate is fixedly connected with the connecting bolts 2-5 for 4.

The long standard section 3 consists of a rectangular connecting end plate 3-1, a long connecting bolt 3-2 and a long main body box section 3-3; the short standard section 4 consists of a short square connecting end plate 4-1, a short connecting bolt 4-2 and a short main body box section 4-3, the standard section is a main body of the supporting rod, and the length is preliminarily adjusted through the long and short connecting rods.

The adjusting section 5 consists of an adjusting square connecting end plate 5-1, an adjusting connecting bolt 5-2, a steel pipe main body 5-3, an internal thread adjusting steel pipe 5-5 and an upper thread steel pipe 5-6, the adjusting square connecting end plate 5-1 and the adjusting connecting bolt 5-2 are used for connecting the adjusting section and the standard section, a thread is arranged inside the steel pipe 5-4 and used for adjusting the length of the upper thread steel pipe 5-6 penetrating into the steel pipe main body 5-3, and the length is adjusted through the rotation of the steel pipe 5-4.

The side plate section 6 is composed of a side connecting end plate 6-1, a side connecting bolt 6-2, a side main box body section 6-3, a side double-strand plate 6-4, a side pin shaft 6-5 and a top plate 6-6, the side connecting end plate 6-1 and the side connecting bolt 6-2 are used for being connected with other rod pieces, the side double-strand plate 6-4 is composed of two steel plates with front section box-shaped circular rear ends, circular holes are formed in the rear section, the size of each steel plate is identical to that of the circular hole in the top plate 6-6, and the side double-strand plate 6-4 is connected with the top plate 6-6 through the side pin shaft 6-5.

Claims

1. The utility model provides a counter-force strutting arrangement for open caisson back cover, includes the chassis and sets up a plurality of bracing piece on the chassis, characterized in that, the bracing piece include bottom plate linkage segment, support section and curb plate section, the support section include the standard section that a plurality of sections can splice, rigid connection between the standard section, the curb plate section pastes and leans on at the open caisson inside wall, the bottom plate linkage segment rotate to be connected the chassis.

2. The counterforce supporting device for the bottom sealing of the open caisson according to claim 1, wherein the chassis comprises a connecting plate matched with the supporting rod, and a connecting hole is arranged on the connecting plate.

3. The counterforce supporting device for bottom sealing of the open caisson according to claim 2, wherein the bottom plate connecting section comprises a double strand plate matched with the connecting plate, and the double strand plate is fixed on the connecting hole through a pin shaft.

4. The counterforce supporting device for the caisson closing bottom of claim 1, wherein connecting plates are arranged at two sides of the standard section, and the standard section is fixed with other standard sections or the bottom plate connecting section or the side plate section through the connecting plates.

5. The counterforce supporting device for the bottom sealing of the open caisson according to claim 1, wherein the side plate section comprises a side plate, a side connecting plate is arranged on the side plate, a side connecting hole is arranged on the side connecting plate, and the counterforce supporting device further comprises a main body box, a side double-strand plate is arranged on the main body box, and the side double-strand plate is fixed on the side connecting hole through a bolt.

6. The counterforce supporting device for the bottom sealing of the open caisson according to claim 1, wherein the counterforce supporting device further comprises an adjusting section, the adjusting section comprises a steel pipe main body, internal threads are arranged in the steel pipe main body, an adjusting pipe with external threads is further arranged in the steel pipe main body, connecting plates are arranged on two sides of the adjusting section, and the adjusting section fixes other standard sections or the bottom plate connecting section or the side plate section through the connecting plates.

7. The counterforce supporting device for the caisson closing bottom according to claim 4, wherein the standard section comprises a long standard section and a short standard section.