Construction structure for assisting sinking of open caisson

Abstract

The utility model relates to the technical field of building construction, in particular to a construction structure for assisting sinking of an open caisson, a cast-in-situ bored pile is arranged on the periphery of the open caisson, a steel support is arranged on the outer side of the top of the open caisson, a top beam is arranged on the top of the cast-in-situ bored pile, and a bracket is arranged on the inner side of the top beam. The steel support is connected with the bracket through a steel strand, one end of the steel strand is connected with a jack, and the jack is arranged on the steel support. The sinking assisting device has the advantages that when sinking of the open caisson is blocked, downward pressure can be provided for assisting sinking, and the sinking assisting device is particularly obvious in effect on large open caissons and complex geological conditions; the deviation rectifying effect can be achieved by adjusting the pulling force of different jacks; the structure is simple and reasonable, convenient to construct, high in flexibility and suitable for popularization.

Description

Technical Field

[0001] The utility model relates to the technical field of building construction, in particular to a construction structure for assisting the sinking of a caisson. Background Art

[0002] During the sinking process of a large caisson, there are many uncertainties due to different geological conditions. How to control and assist the sinking of a large caisson is very critical. At present, there are two main aspects of assisted caisson sinking at home and abroad. One is to reduce the friction between the contact surface between the caisson wall and the soil layer, such as thixotropic mud, water jetting, air curtain, etc.; the other is to increase the deadweight of the caisson or counterweight to increase the deadweight, such as blasting, placing heavy objects on the top, and setting prestressed steel bars. The caisson is affected by unforeseen factors during the sinking process. There are many uncertain factors that may cause the caisson to deviate or twist, so posture control during the sinking process is also very important. Summary of the invention

[0003] The purpose of the utility model is to provide a construction structure for assisting the sinking of a caisson in response to the above-mentioned deficiencies in the prior art, thereby providing downward pressure on the caisson to assist the sinking; at the same time, during the sinking process, the posture of the caisson can be controlled and corrected. If torsion or lateral deviation occurs, different pulling forces of the jack can be adjusted to apply different downward pressures on the top of the jacking pipe, thereby achieving a correction effect.

[0004] The purpose of this utility model is achieved by the following technical solutions:

[0005] A construction structure for assisting the sinking of a caisson comprises a caisson, and is characterized in that bored cast-in-place piles are driven around the periphery of the caisson, a steel support is arranged on the outer side of the top of the caisson, a crown beam is arranged on the top of the bored cast-in-place pile, a corbel is arranged on the inner side of the crown beam, the steel support and the corbel are connected by a steel strand, one end of the steel strand is connected to a jack, and the jack is arranged on the steel support.

[0006] The steel support comprises a steel section and an angle steel. One end of the steel section is fixedly connected to the caisson. The angle steel reinforcement support is provided between the cantilevered end of the steel section and the outer wall of the caisson.

[0007] The two groups of steel supports are arranged on the outer wall of the caisson at a certain interval, the jack is installed at a position between the two groups of steel supports, and the steel strand passes through the gap between the two groups of steel supports.

[0008] The bored cast-in-place piles and their crown beams are symmetrically driven around the caisson and corresponding corbels are arranged. Corresponding steel supports are arranged around the caisson, and each of the steel supports and the corbels are connected one by one through the steel strands.

[0009] The jack is connected with a servo system.

[0010] The advantages of the utility model are: when the sinking of the caisson is blocked, downward pressure can be provided to assist the sinking, which is particularly effective for large caissons and those under complex geological conditions; the deviation correction effect can be achieved by adjusting the pulling force of different jacks; the structure is simple and reasonable, the construction is convenient, the flexibility is strong, and it is suitable for promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the utility model;

[0012] Figure 2 It is a schematic diagram of the installation structure of the jack in the utility model;

[0013] Figure 3 This is a schematic diagram of the use state of the utility model (sinking-assisted state);

[0014] Figure 4 This is a schematic diagram of the use state of the utility model (correction state). DETAILED DESCRIPTION

[0015] The following is a further detailed description of the features of the present invention and other related features through embodiments in conjunction with the accompanying drawings to facilitate understanding by technicians in the same industry:

[0016] like Figure 1-4 As shown, the marks 1-9 in the figure respectively represent: caisson 1, bored pile 2, cap beam 3, corbel 4, steel support 5, jack 6, steel strand 7, steel section 8, angle steel 9.

[0017] Example: Figures 1 to 4 As shown, the construction structure for assisting the sinking of the caisson in this embodiment is used to assist the sinking of the caisson 1, and further realizes the correction of the caisson 1 during the sinking process, thereby improving the sinking construction accuracy of the caisson 1.

[0018] Specifically, if Figure 1 As shown, a number of bored piles 2 as ground anchors are driven around the sinking area of ​​the caisson 1, and the bored piles 2 are connected by a crown beam 3 to form an integral structure. A corbel 4 extending toward one side of the caisson 1 is arranged on the inner side of the crown beam 3. A steel support 5 is arranged at a position on the outer wall of the caisson 1 corresponding to the corbel 4, and a jack 6 is arranged on the steel support 5, and the jack 6 is fixedly connected to the corbel 4 through a steel strand 7.

[0019] Combination Figure 1 and Figure 2As shown, in this embodiment, two groups of steel supports 5 are arranged at intervals at the outer wall position of the caisson 1 corresponding to the corbel 4. Each group of steel supports 5 is composed of a steel section 8 and an angle steel 9, wherein one end of the steel section 8 is fixedly connected to the caisson 1, and the other end is cantilevered outward; the angle steel 9 is erected between the caisson 1 and the steel section 8 to play a diagonal bracing role to strengthen the structural performance, one end of which is fixedly connected to the caisson 1, and the other end is fixedly connected to the cantilevered end of the steel section 8. The jack 6 is installed between the two groups of steel supports 5, and the steel strand 7 connected thereto passes through the reserved gap between the two groups of steel supports 5. By such an arrangement, this embodiment can disperse the force applied by the jack 6 at two positions of the caisson 1, avoiding the problem of support failure caused by excessive local force, and at the same time can further ensure that the force of the jack 6 can be stably transmitted to the caisson 1.

[0020] like Figure 3 and Figure 4 As shown, this embodiment has the following conditions when actually used:

[0021] 1) When caisson 1 is lowered normally, no other construction is required and it sinks normally.

[0022] 2) When the caisson 1 is blocked during the sinking process, install a suitable steel support 5 on the outside of the top of the caisson 1, place and fix the jack 6, and then connect the jack 6 to the bracket 4 of the crown beam 3 with a steel strand 7. The number and tonnage of the jack 6 are selected according to different caissons. Figure 3 As shown, during construction, the jack 6 is controlled to pull the steel strand 7 to generate a downward pulling force, which is transmitted to the caisson 1 to indirectly provide a downward pressure for the caisson 1 to sink, thereby achieving an effect of assisting the sinking.

[0023] Combination Figure 1 and Figure 3 As shown, in order to ensure the posture accuracy of the caisson 1 when sinking, bored piles 2 and their cap beams 3 are symmetrically driven around the caisson 1 and corresponding corbels 4 are arranged, and corresponding steel supports 5 are arranged around the caisson 1. Each steel support 5 is connected to each corresponding corbel 4 by a steel strand 7. Figure 3 For example, the jacks 6 on both sides apply downward pulling forces F1 and F2 respectively, so that both sides of the caisson 1 are subjected to the same force at the same time and continue to sink steadily in a vertical posture.

[0024] 3) When the caisson 1 has posture deviations such as displacement and twisting during the sinking process, the current posture of the caisson 1 is first measured, and the different pulling forces of the jack 6 are controlled to generate different downward pressures on different parts of the caisson 1 to achieve the correction effect.

[0025] by Figure 4For example, the sinking amplitude of one side of the caisson 1 (the right side of the figure) is greater than the sinking amplitude of the other side (the left side of the figure), and the posture of the caisson 1 deviates. At this time, the jack 6 installed on the left side of the figure applies a downward force F1, and the downward force F1 is greater than the downward force F2 applied by the jack 6 on the right side of the figure. In this way, when the caisson 1 continues to sink, the left side of the caisson, which originally had a smaller sinking amplitude, will accelerate the sinking and increase the sinking amount under the action of the larger downward force F1, while the right side of the caisson, which originally had a larger sinking amplitude, will only be subject to the smaller downward force F2. Although it will sink synchronously, its sinking speed and sinking amount are less than the left side of the caisson, so as the caisson 1 continues to sink, it achieves a correction effect.

[0026] In the specific implementation of this embodiment: in order to further improve the control accuracy of the jack 6, a servo system can be added, and the jack 6 can be connected to the servo system to intelligently control the operation of the jack 6 to achieve the functions of monitoring and correcting.

[0027] Although the above embodiments have described the concepts and embodiments of the purpose of the utility model in detail with reference to the accompanying drawings, ordinary technicians in this field can recognize that various improvements and modifications can still be made to the utility model without departing from the scope of the claims, so they are not described one by one here.

Claims

1. A construction structure for assisting the sinking of a caisson, comprising a caisson, characterized in that: Bored cast-in-place piles are driven around the periphery of the caisson, steel supports are arranged on the outer side of the top of the caisson, a crown beam is arranged on the top of the bored cast-in-place piles, a corbel is arranged on the inner side of the crown beam, the steel support and the corbel are connected by a steel strand, one end of the steel strand is connected to a jack, and the jack is arranged on the steel support.

2. A construction structure for assisting caisson sinking according to claim 1, characterized in that: The steel support comprises a steel section and an angle steel. One end of the steel section is fixedly connected to the caisson. The angle steel reinforcement support is provided between the cantilevered end of the steel section and the outer wall of the caisson.

3. A construction structure for assisting caisson sinking according to claim 2, characterized in that: The two groups of steel supports are arranged on the outer wall of the caisson at a certain interval, the jack is installed at a position between the two groups of steel supports, and the steel strand passes through the gap between the two groups of steel supports.

4. The construction structure for assisting caisson sinking according to claim 1 is characterized in that: The bored cast-in-place piles and their crown beams are symmetrically driven around the caisson and corresponding corbels are arranged. Corresponding steel supports are arranged around the caisson, and each of the steel supports and the corbels are connected one by one through the steel strands.

5. The construction structure for assisting caisson sinking according to claim 1 is characterized in that: The jack is connected with a servo system.

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