An assembled bracket and supporting equipment for caisson sinking process

Abstract

The present invention relates to an assembled bracket and supporting equipment for a caisson pressure sinking process, comprising a detachable assembled main bracket, a through-hole oil cylinder for a horizontal tie rod, an auxiliary bracket for a horizontal tie rod, a through-hole oil cylinder for pressure sinking, a steel strand for pressure sinking, an anti-pullout pile, and an anchor for fixing a steel strand. The assembled main bracket is fixedly connected to the port of each caisson section via an embedded part pre-buried in the side of the port of each caisson section, the auxiliary bracket for the horizontal tie rod is fixedly connected to the top of the port of each caisson section via an embedded part pre-buried in the upper end of the port of each caisson section, a through-hole oil cylinder for the horizontal tie rod is connected between the assembled main bracket and the auxiliary bracket for the horizontal tie rod, the through-hole oil cylinder for pressure sinking is fixedly connected to the detachable assembled main bracket, and the through-hole oil cylinder for pressure sinking is connected to the anti-pullout pile via an anchor for fixing a steel strand and a steel strand. The assembled bracket and supporting equipment for the caisson pressure sinking process of the present invention, through their combined use, improve and solve the drawbacks of the currently commonly used caisson pressure-assisted sinking process.

Description

Technical Field

[0001] The present invention relates to the field of underground engineering caisson construction, in particular to an assembled bracket and matching equipment for a caisson pressure sinking process. Background Art

[0002] Caisson construction technology for underground projects has a long history and is widely used in water conservancy, transportation, tunnels, power facilities, municipal engineering, and large-scale deep underground structures. Traditional caisson construction techniques can easily damage surrounding structures and pipelines. They are also limited in suitability for a wide range of soil types, have shallow sinking depths, and are prone to tilting. Under certain soil conditions, water-filled caisson sinking can result in slow construction progress, low time efficiency, and high economic costs.

[0003] In recent years, the pressure-assisted sinking process for caissons has been gradually adopted. This method utilizes pressure, replacing the traditional reliance solely on the caisson's own weight with a combination of caisson weight and adjustable pressure. This ensures a sufficient sinking coefficient, eliminating the adverse effects of soil strata on the caisson. Its advantages include: 1. Utilizing soil plugs to balance pressure, resulting in minimal disturbance; 2. The downward pressure directly controls the height difference of the caisson; 3. The sinking coefficient is proportional to the downward pressure; 4. The influence of soil quality on the caisson is significantly reduced; and 5. Construction speed is significantly increased.

[0004] At present, the commonly used caisson pressure-assisted sinking process is to install embedded parts on the outer wall of the caisson, weld the brackets on them, and install a fixed through-hole oil cylinder (see Figure 1 ) Pull-out piles are placed underground at the horizontal projection of the corbels, forming a pair of pressure points. Generally, when sinking a caisson, considering both cost-effectiveness and operability, each pressure point is required to bear a force of several hundred tons. Because the caisson sinking process involves a micro-disturbance of the surrounding soil, the pull-out piles cannot be placed too close to the well wall. Therefore, a safe distance must be maintained between the pressure points and the well wall, increasing the outward extension of the corbels. This results in a significant bending moment at the base of the cantilevered corbels at the joints between the embedded components.

[0005] To overcome this disadvantage, diagonal braces are typically placed beneath the corbels to improve their load-bearing conditions. However, the placement of these diagonal braces causes the final caisson opening to be significantly elevated above the ground, significantly affecting the final position of the caisson's opening. Many caisson designs prohibit a significant elevation difference between the opening and the ground. The elevated portion of the reinforced concrete structure caused by the construction process must be removed, resulting in significant labor, waste, and time. This results in significant waste.

[0006] Caisson construction and sinking are not completed in one go; they are typically constructed and lowered in multiple stages. Especially with today's increasingly deep caisson designs, the number of sub-assembly and multiple sinking steps increases. Disassembly and re-use of brackets saves time and effort. Bolted connections require minimal technical expertise and are safe and reliable. On-site welding, on the other hand, primarily vertical welds, requires not only specialized personnel but also exceptional technical skills. Summary of the Invention

[0007] The present invention aims to provide an assembled bracket and supporting equipment for a caisson pressure sinking process, and to improve and solve the drawbacks of the currently commonly used caisson pressure-assisted sinking process through their combined use.

[0008] To achieve the above-mentioned purpose, the technical solution of the present invention is: an assembled corbel and supporting equipment for the caisson sinking process, including a detachable assembled main corbel, a through-core cylinder for horizontal pull rods, an auxiliary corbel for horizontal pull rods, a through-core cylinder for sinking, a steel strand for sinking, pull-out piles, and an anchor for fixing a steel strand. The assembled main corbel is fixedly connected to the port of each caisson section by an embedded part embedded in the side of the port of each caisson section, the auxiliary corbel for horizontal pull rods is fixedly connected to the top of the port of each caisson section by an embedded part embedded in the upper end of the port of each caisson section, a through-core cylinder for horizontal pull rods is connected between the assembled main corbel and the auxiliary corbel for horizontal pull rods, the through-core cylinder for sinking is fixedly connected to the detachable assembled main corbel, and the through-core cylinder for sinking is connected to the pull-out piles through the steel strand for sinking and the anchor for fixing a steel strand.

[0009] Furthermore, the embedded parts of the assembled main corbel are pre-tapped with screw holes for connecting and installing the assembled main corbel.

[0010] Furthermore, the bottom surface of the assembled main corbel is fixedly connected to a through-hole oil cylinder for pressing and sinking, and is provided with a through hole for passing the steel strand. The upper part is connected to a through-hole oil cylinder for a horizontal pull rod, and is provided with a through hole for passing the horizontal pull rod.

[0011] Furthermore, the bottom surface of the horizontal tie rod is prefabricated with auxiliary brackets, and screw holes are prefabricated on the bottom surface of the horizontal tie rod to connect with the embedded parts of each wellhead wall, and the fixing bolts are passed through the side surface, and a through hole is opened to pass through the horizontal tie rod and locally reinforce it.

[0012] Furthermore, the horizontal pull rod is pre-embedded with the embedded parts of the auxiliary corbels and arranged at the upper end of each caisson, and screw holes for connecting and installing the corbels are pre-drilled.

[0013] Furthermore, the horizontal pull rod is made of alloy material with a high-strength bolt pair, and the fully threaded pull rod can adjust the distance in a wide range.

[0014] Furthermore, the through-hole oil cylinder for sinking applies the sinking force to the caisson through the sinking steel strands.

[0015] The beneficial effects of the present invention are:

[0016] The assembled bracket and the matching machine for the caisson pressure sinking process of the present invention are used in combination to improve and solve the drawbacks of the currently commonly used caisson pressure-assisted sinking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a common vertical view of the fixed bracket configuration through-hole oil cylinder caisson pressure (force) sinking process;

[0018] Figure 2 This is an elevational view of the sinking process of the caisson assembled type bracket fixed through-core oil cylinder and other sinking aids of the present invention;

[0019] Figure 3 It is a plan view of the pressure (force) assisted sinking process of the assembled corbel caisson;

[0020] Figure 4 It is a schematic diagram of the arrangement of the assembled corbels and through-hole cylinders and other sinking equipment;

[0021] Figure 5 It is a schematic diagram of the resultant force generated by the vertical subsidence force and the horizontal pull rod force during subsidence on the main corbel. DETAILED DESCRIPTION

[0022] The following is a further detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. The following figures are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0023] like Figures 2 to 4 As shown, the present invention provides an assembled corbel and supporting equipment for the caisson sinking process, including a detachable assembled main corbel 1 and its embedded parts, a through-hole cylinder 3 for a horizontal pull rod, an auxiliary corbel 4 for a horizontal pull rod and its embedded parts 5, as well as a through-hole cylinder 2 for sinking, a steel strand 7 for sinking (which can also be replaced by a bolt auxiliary pull rod), an anti-pull pile 9, an anchor 8 for fixing the steel strand (pull rod), etc., which are standard for the caisson sinking process.

[0024] Prefabricated main corbels are embedded in the ports of each caisson section 10 and pre-drilled with screw holes for attaching and installing the prefabricated main corbels. The bottom of the prefabricated main corbel 1 is fixedly connected to a through-hole for sinking a steel strand, which is provided with a through hole for inserting a steel strand. This allows the through-hole for sinking a steel strand to be moved and adjusted within a limited range. The lower side of the prefabricated main corbel 1, connected to the pre-embedded components in the well wall, is drilled with screw holes for connecting bolts 6 for fixing. The top is connected to a through-hole for a horizontal tie rod 3, which is also provided with a through hole for inserting the horizontal tie rod. The through-hole for sinking a steel strand 7 and a steel strand (tie rod) anchor 8 are connected to the pull-out pile 9.

[0025] The detachable horizontal pull rod is used with an auxiliary bracket 4, and the bottom surface is prefabricated with screw holes connected to the embedded parts of each wellhead wall for connecting with fixing bolts 6, and the side is provided with a through hole for passing the horizontal pull rod for local reinforcement.

[0026] The horizontal pull rod is pre-embedded with auxiliary corbel embedded parts 4 and arranged at the upper end of each caisson 10, and screw holes for connecting and installing the corbels are pre-drilled.

[0027] The detachable horizontal pull rod is made of alloy material with a high-strength bolt pair, and the fully threaded pull rod 11 can be adjusted in a wide range.

[0028] The standard configuration of the caisson sinking process includes the through-hole oil cylinder 2, steel strand 7 (which can also be replaced by bolt auxiliary pull rod), pull-out piles 9, steel strand (pull rod) fixing anchor 8 and other structures and equipment, which are used to generate and apply the caisson sinking force.

[0029] like Figure 2 As shown, the disadvantages of the currently commonly used caisson pressure-assisted sinking process are improved and solved by adding a set of horizontal pull rod tool components.

[0030] In order to ensure the reliability of the working condition, a horizontal auxiliary force is set to achieve the purpose. The invention fixes and transmits the force of the horizontal pull rod through the auxiliary bracket, and installs a through-core oil cylinder at one end of the pull rod and then locks it with a nut.

[0031] When the caisson enters the pressure sinking state, the vertical cylinder applies pressure, and at the same time the horizontal cylinder acts to make the pull rod generate a horizontal force on the main bracket, and the horizontal force is greater than the vertical pressure sinking force. According to the change of the pressure sinking force, the horizontal tension is also adjusted accordingly. In this way, a combined force is generated on the bracket to press the well wall, making the bending moment stress formed by the main bracket become very small (see Figure 5 ), therefore, the diagonal brace provided under the corbel is unnecessary and can be removed.

[0032] In addition, under the condition of caisson height difference correction, a sleeve is installed on the horizontal tie rod between the main bracket for sinking and the auxiliary bracket for horizontal tie rod to increase the rigidity of the main bracket for sinking.

[0033] Since the resultant force tends to compress the corbel, the connection stress between the corbel and the embedded parts and the bonding stress between the embedded parts and the concrete wall of the caisson are greatly improved (the compressive stress of reinforced concrete is much greater than the tensile stress). The use of detachable assembled corbels becomes a safe and feasible solution.

Claims

1. An assembled bracket and supporting equipment for caisson sinking process, characterized by: It includes a detachable assembled main corbel, a through-core cylinder for horizontal pull rods, an auxiliary corbel for horizontal pull rods, a through-core cylinder for pressure sinking, a steel strand for pressure sinking, pull-out piles, and an anchor for fixing with a steel strand. The assembled main corbel is fixedly connected to the port of each caisson section by an embedded part embedded in the side of the port of each caisson section, and the auxiliary corbel for horizontal pull rods is fixedly connected to the top of the port of each caisson section by an embedded part embedded in the upper end of the port of each caisson section. A through-core cylinder for horizontal pull rods is connected between the assembled main corbel and the auxiliary corbel for horizontal pull rods. The through-core cylinder for pressure sinking is fixedly connected to the detachable assembled main corbel, and the through-core cylinder for pressure sinking is connected to the pull-out piles through an anchor for fixing with a steel strand for pressure sinking and a steel strand.

2. The assembled bracket and supporting equipment for the caisson sinking process according to claim 1 are characterized by: The embedded parts of the assembled main corbel are pre-tapped with screw holes for connecting and installing the assembled main corbel.

3. The assembled bracket and supporting equipment for the caisson sinking process according to claim 1 are characterized by: The bottom surface of the assembled main corbel is fixedly connected to a through-hole oil cylinder for pressing and sinking, and is provided with a through hole for passing the steel strand. The upper part is connected to a through-hole oil cylinder for a horizontal pull rod, and is provided with a through hole for passing the horizontal pull rod.

4. The assembled bracket and supporting equipment for the caisson sinking process according to claim 1 are characterized by: The bottom surface of the horizontal tie rod is prefabricated with auxiliary corbels, and screw holes are used to connect with the embedded parts of each wellhead wall to pass through and fix the connecting bolts. A through hole is opened on the side to pass through the horizontal tie rod for local reinforcement.

5. The assembled bracket and supporting equipment for the caisson sinking process according to claim 1 are characterized by: The horizontal pull rod is pre-embedded with the embedded parts of the auxiliary corbel and arranged at the upper end of each caisson, and screw holes for connecting and installing the corbel are pre-drilled.

6. The assembled bracket and supporting equipment for the caisson sinking process according to claim 1 are characterized by: The horizontal pull rod is made of alloy material with high strength bolt pair and full thread pull rod, which can adjust the distance in a wide range.

7. The assembled bracket and supporting equipment for the caisson sinking process according to claim 1 are characterized by: The through-hole oil cylinder for sinking applies the sinking force to the caisson through the sinking steel strands.

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