An assembled open caisson construction device and method

Abstract

The application discloses an assembled open caisson construction device and method, and relates to the technical field of open caisson construction. The assembled open caisson construction device comprises a sinking control device and a prestressed anchor, the prestressed anchor is used for being pre-buried in a prefabricated pipe piece, and the sinking control device is used for being connected with the prestressed anchor to pull or press down the prefabricated pipe piece. The assembled open caisson construction device provided by the embodiment of the application can constrain the vertical displacement of the well wall structure by connecting the sinking control device with the prestressed anchor in the prefabricated pipe piece during construction, active adjustment and accurate control of the sinking time, single sinking amplitude and sinking speed of the well wall are realized, the purpose of adjusting the sinking coefficient of the open caisson in the sinking process is achieved, the problems of "sudden sinking" and "stuck" of the open caisson are effectively solved, and the stability of the sinking of the open caisson is improved.

Description

Technical Field

[0001] This application relates to the field of caisson construction technology, specifically to a prefabricated caisson construction device and method. Background Technology

[0002] The sinking coefficient of a caisson is affected by its own weight, side friction, and cutting edge reaction force. An excessively large sinking coefficient can easily lead to problems such as "sudden sinking" and "deviation," while an excessively small sinking coefficient can cause "jamming" and difficulty in sinking. In actual construction, the complex and variable geological strata result in greater uncertainty in side friction and cutting edge reaction force, which directly affects the stability of the caisson sinking.

[0003] Conventional methods to prevent caissons from "suddenly sinking" include installing transverse beams at the cutting edge and adding rubble to increase the reaction force at the cutting edge. Conventional methods to prevent caissons from "getting stuck" include using variable cross-sections, mud sleeves, ballast, and air curtains to aid sinking. While conventional auxiliary measures can achieve effective sinking of the caisson, they cannot precisely control the timing, amplitude, and speed of sinking, resulting in significant instability during caisson sinking. Summary of the Invention

[0004] The purpose of this application is to provide a prefabricated caisson construction device and method to solve the problem of high instability during caisson sinking.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] In a first aspect, a prefabricated caisson construction device is provided, including a sinking control device and prestressed anchor bars. The prestressed anchor bars are used to be pre-embedded in precast segments, and the sinking control device is used to connect with the prestressed anchor bars to lift or press down the precast segments.

[0007] Furthermore, a hand hole groove is provided at the lower end of the precast segment, the lower end of the prestressed anchor bar extends into the hand hole groove, and the upper end of the prestressed anchor bar extends out from the upper end of the precast segment to form a connecting end.

[0008] Furthermore, the sinking control device includes a fixed frame, a lifting steel frame, and a lifting cylinder. The lifting cylinder is disposed between the fixed frame and the lifting steel frame and is used to drive the lifting steel frame to move up and down. The lifting steel frame is used to connect with the prestressed anchor bar.

[0009] Furthermore, the fixing frame includes a base, a sliding column fixed on the base, and a sliding rod disposed on the sliding column and movable up and down. The lifting cylinder is disposed between the base and the lifting steel frame, and the lifting steel frame is connected to the sliding rod.

[0010] Furthermore, a diagonal brace is provided between the base and the sliding column.

[0011] Furthermore, the sinking control device also includes a vertically arranged cylinder protection barrel with an open bottom. The cylinder body of the lifting cylinder is connected to the fixed frame, and the piston rod of the lifting cylinder extends into the cylinder protection barrel and is connected to the bottom of the cylinder protection barrel.

[0012] Furthermore, the lifting steel frame is detachably connected to the prestressed anchor bar via a connecting seat.

[0013] Furthermore, the connecting seat includes a lifting ring, an ear plate, an anchor plate, and an insert rod. The lifting ring and the ear plate are sleeved on the insert rod. The lifting ring is connected to the lifting steel frame. The ear plate is connected to the anchor plate. The anchor plate is provided with anchor holes for the prestressed anchor bars to pass through.

[0014] Furthermore, the fixing frame also includes a counterweight base, which is connected to the base.

[0015] Secondly, a prefabricated caisson construction method is provided, employing the prefabricated caisson construction device provided in the first aspect, comprising the following steps:

[0016] S1. Excavate the first layer of soil. After the excavation is completed, pour a reinforced concrete ring beam. Hoist the precast cutting edge to the predetermined position and install several sinking control devices along its circumference on the reinforced concrete ring beam.

[0017] S2. Install the first precast segment on the precast cutting edge, connect the prestressed anchor bars in the precast cutting edge to the prestressed anchor bars in the precast segment, and connect the sinking control device to the upper end of the prestressed anchor bars in the precast segment; excavate the soil layer to the specified depth, and use the sinking control device to sink the first section of the well wall to the specified depth.

[0018] S3. Remove the connection structure between the sinking control device and the prestressed anchor bar, control the sinking control device to reset, install the next precast segment, connect the prestressed anchor bars between two adjacent precast segments, connect the sinking control device to the upper end of the prestressed anchor bar in the uppermost precast segment; excavate the soil layer to the specified depth, and use the sinking control device to sink the next section of the well wall to the specified depth.

[0019] S4. Repeat step S3 until the well wall construction is completed.

[0020] The beneficial effects of this application are:

[0021] The prefabricated caisson construction device and method provided in this application embodiment can constrain the vertical displacement of the caisson wall structure by connecting the sinking control device to the prestressed anchor bars in the precast segments during construction. This enables active adjustment and precise control of the sinking timing, single sinking amplitude, and sinking speed of the caisson wall, thereby adjusting the sinking coefficient of the caisson during the sinking process. This effectively solves problems such as "sudden sinking" and "stuck" of the caisson and improves the stability of the caisson sinking. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a perspective view of the sinking control device provided in the embodiments of this application;

[0024] Figure 2 This is a side view of the sinking control device provided in the embodiments of this application;

[0025] Figure 3 This is a schematic diagram of the connection between the sinking control device and the prestressed anchor bar.

[0026] Figure 4 This is a site layout diagram during the caisson sinking construction.

[0027] Figure label:

[0028] 1-Sinking control device;

[0029] 11-Fixed bracket;

[0030] 111-Base; 112-Slide column; 113-Slide rod; 114-Diagonal brace; 115-Counterweight seat;

[0031] 12-Lifting steel frame;

[0032] 13-Lifting cylinder;

[0033] 14-Hydraulic cylinder protection barrel;

[0034] 15-Connector;

[0035] 151-Lifting ring; 152-Ear plate; 153-Anchor plate; 154-Insertion rod;

[0036] 2-Prestressed anchor bars;

[0037] 21-Anchor bar connector;

[0038] 3-Precast tunnel segments;

[0039] 31-Handhole groove;

[0040] 4-Reinforced concrete ring beam;

[0041] 5-Pre-fabricated cutting edge;

[0042] 6-Counterweight. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0044] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, the embodiments and features described in these embodiments can be combined with each other unless otherwise specified.

[0045] In the description of the embodiments of this application, the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use, or the orientation or positional relationship commonly understood by those skilled in the art. The terms "set", "open", "installed", "connected", and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, and integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components.

[0046] See Figure 1 , Figure 2 , Figure 3 , Figure 4 The present application provides a prefabricated caisson construction device, including a sinking control device 1 and a prestressed anchor bar 2. The prestressed anchor bar 2 is used to be pre-embedded in the precast segment 3, and the sinking control device 1 is used to connect with the prestressed anchor bar 2 to lift or press down the precast segment 3.

[0047] The construction method using the prefabricated caisson construction device provided in this application includes the following steps:

[0048] S1. Excavate the first layer of soil. After the excavation is completed, pour the reinforced concrete ring beam 4. Hoist the precast cutting edge to the predetermined position. Install several sinking control devices 1 along the circumference of the reinforced concrete ring beam 4.

[0049] For example, the excavation depth of the first layer of soil is 1m, and the excavation radius is the sum of the caisson radius and the width of the reinforced concrete ring beam 4. After the excavation is completed, the ground is leveled, and then formwork is erected, steel bars are tied, and concrete is poured to form the reinforced concrete ring beam 4. Anchor bolts should be pre-embedded on the reinforced concrete ring beam 4. After the strength of the reinforced concrete ring beam 4 meets the requirements, the formwork is removed, and the precast cutting feet 5 are hoisted to the predetermined position. Several precast cutting feet 5 form a circular structure. Then, several sinking control devices 1 are evenly distributed along the circumference of the reinforced concrete ring beam 4 and the sinking control devices 1 are fixed with anchor bolts.

[0050] S2. Install the first precast segment 3 on the precast cutting edge 5, connect the prestressed anchor bar 2 in the precast cutting edge 5 to the prestressed anchor bar 2 in the precast segment 3, and connect the sinking control device 1 to the upper end of the prestressed anchor bar 2 in the precast segment 3; excavate the soil layer to the specified depth, and use the sinking control device 1 to sink the first section of the well wall to the specified depth.

[0051] S3. Remove the connection structure between the sinking control device 1 and the prestressed anchor bar 2, control the sinking control device 1 to reset, install the next precast segment 3, connect the prestressed anchor bars 2 between two adjacent precast segments 3, and connect the sinking control device 1 to the upper end of the prestressed anchor bar 2 in the uppermost precast segment 3; excavate the soil layer to the specified depth, and use the sinking control device 1 to sink the next section of the well wall to the specified depth.

[0052] S4. Repeat step S3 until the well wall construction is completed.

[0053] The prefabricated caisson construction device and method provided in this application embodiment, during construction, connects the sinking control device 1 to the prestressed anchor bar 2 in the precast segment 3, so as to apply downward pressure or lifting force to the caisson wall using the sinking control device 1, which can constrain the vertical displacement of the caisson wall structure, realize the active adjustment and precise control of the sinking timing, single sinking amplitude and sinking speed of the caisson wall, achieve the purpose of adjusting the sinking coefficient of the caisson during the sinking process, effectively solve the problems of "sudden sinking" and "stuck" of the caisson, and improve the stability of the caisson sinking.

[0054] In some embodiments, see Figure 3 The lower end of the precast segment 3 is provided with a handhole groove 31. The lower end of the prestressed anchor bar 2 extends into the handhole groove 31, and the upper end of the prestressed anchor bar 2 extends from the upper end of the precast segment 3 to form a connecting end. After two adjacent precast segments 3 are assembled, the connecting end of the prestressed anchor bar 2 in the lower precast segment 3 extends into the handhole groove 31 at the lower end of the upper precast segment 3. Construction personnel can easily connect the two prestressed anchor bars 2 in the handhole groove 31 together through the anchor bar connector 21. When the two prestressed anchor bars 2 in the handhole groove 31 are connected together, the handhole groove 31 can also be sealed with cement mortar.

[0055] In some embodiments, see Figure 1 , Figure 2 The sinking control device 1 includes a fixed frame 11, a lifting steel frame 12, and a lifting cylinder 13. The lifting cylinder 13 is located between the fixed frame 11 and the lifting steel frame 12 and is used to drive the lifting steel frame 12 to move up and down. The lifting steel frame 12 is used to connect with the prestressed anchor bar 2.

[0056] For example, the fixing frame 11 is used to support the reinforced concrete ring beam 4 during construction and is fixed by anchor bolts. The lifting cylinder 13 is vertically arranged, with its lower end connected to the fixing frame 11 and its upper end connected to the lifting steel frame 12. During construction, the fixing frame 11 is fixed to the reinforced concrete ring beam 4 by anchor bolts, and the lifting steel frame 12 abuts against the top of the precast tunnel segment 3 and is connected to the prestressed anchor bar 2. By controlling the extension and retraction of the lifting cylinder 13, the lifting steel frame 12 is driven to move up and down, thereby applying downward pressure or upward lifting force to the precast tunnel segment 3.

[0057] In some embodiments, see Figure 1 , Figure 2 The fixed frame 11 includes a base 111, a sliding column 112 fixed on the base 111, and a sliding rod 113 that is disposed on the sliding column 112 and can move up and down. The lifting cylinder 13 is disposed between the base 111 and the lifting steel frame 12, and the lifting steel frame 12 is connected to the sliding rod 113.

[0058] For example, the base 111 is assembled from longitudinal and transverse steel beams, and the lower end of the lifting cylinder 13 is fixed to the middle of the base 111. A sliding column 112 is vertically arranged on one side of the lifting cylinder 13, and its lower end is fixedly connected to the base 111. A sliding rod 113 is slidably mounted on the sliding column 112 and can move up and down along the sliding column 112. The lifting frame 12 is connected to the sliding rod 113, thereby applying a horizontal constraint to the lifting frame 12 to prevent it from tipping over during its up and down movement.

[0059] In some embodiments, see Figure 1 , Figure 2 A diagonal brace 114 is provided between the base 111 and the slide column 112. By providing the diagonal brace 114, the strength of the connection between the base 111 and the slide column 112 can be improved, increasing the reliability of the fixing frame 11. For example, the diagonal brace 114 is provided on the side of the slide column 112 away from the lifting cylinder 13, and there can be one, two or more diagonal braces 114.

[0060] In some embodiments, see Figure 1 , Figure 2The sinking control device 1 also includes a vertically arranged cylinder protection barrel 14 with an open lower end. The cylinder body of the lifting cylinder 13 is connected to the fixed frame 11, and the piston rod of the lifting cylinder 13 extends into the cylinder protection barrel 14 and is connected to the bottom of the barrel 14. For example, the cylinder protection barrel 14 includes a structure with an open lower end formed by the bottom and a ring of barrel walls. The cylinder body of the lifting cylinder 13 is fixedly connected to the base 111 of the fixed frame 11, and the end of the piston rod of the lifting cylinder 13 abuts against the bottom of the cylinder protection barrel 14 and is fixedly connected by bolts. This allows the piston rod of the lifting cylinder 13 to be protected by the cylinder protection barrel 14, thus improving the service life of the lifting cylinder 13. The lifting steel frame 12 is connected to the lower end of the cylinder protection barrel 14, thereby reducing the installation height of the lifting steel frame 12.

[0061] In some embodiments, see Figure 1 , Figure 2 , Figure 3 The lifting steel frame 12 is detachably connected to the prestressed anchor bar 2 via a connecting seat 15. Exemplarily, the connecting seat 15 includes a lifting ring 151, an ear plate 152, an anchor plate 153, and a rod 154. The lifting ring 151 and ear plate 152 are sleeved on the rod 154. The lifting ring 151 is connected to the lifting steel frame 12, and the ear plate 152 is connected to the anchor plate 153. The anchor plate 153 has anchor holes for the prestressed anchor bar 2 to pass through. Exemplarily, there are two lifting rings 151 and two ear plates 152, with two lifting rings 151 disposed on both sides of the two ear plates 152. Both the lifting rings 151 and ear plates 152 have through holes for the rod 154 to pass through.

[0062] See Figure 3 When connecting the lifting steel frame 12 with the prestressed anchor bar 2, first place the anchor plate 153 on top of the precast segment 3, and let the prestressed anchor bar 2 pass through the anchor hole of the anchor plate 153. Then screw the nut on the upper end of the prestressed anchor bar 2. After tightening the nut, the anchor plate 153 and the prestressed anchor bar 2 are connected. Then, the lifting steel frame 12 is lowered by controlling the lifting cylinder 13. When the lifting ring 151 at the bottom of the lifting steel frame 12 moves downward and the through hole on the lifting ring 151 is aligned with the through hole on the ear plate 152, the insertion rod 154 is inserted into the through hole of the lifting ring 151 and the ear plate 152, thereby realizing the connection between the lifting steel frame 12 and the prestressed anchor bar 2.

[0063] In some embodiments, see Figure 1 The mounting bracket 11 also includes a counterweight base 115, which is connected to the base 111. Exemplarily, the counterweight base 115 is constructed from longitudinal and transverse steel beams. See [link to relevant documentation]. Figure 4 By setting a counterweight seat 115, a counterweight 6 can be set on the counterweight seat 115 during construction to increase the weight of the fixed frame 11, reduce the probability of the fixed frame 11 overturning, and improve the stability of the entire device.

[0064] The above description is merely a preferred embodiment of this application and is not intended to limit this application in any way. Any simple modifications, equivalent substitutions, and improvements made to the above embodiments based on the technical essence of this application and within the spirit and principles of this application shall still fall within the protection scope of the technical solution of this application.

Claims

1. A prefabricated caisson construction device, characterized in that, It includes a sinking control device (1) and a prestressed anchor bar (2), the prestressed anchor bar (2) being used to be embedded in the precast segment (3), and the sinking control device (1) being used to connect with the prestressed anchor bar (2) to lift or press down the precast segment (3). The lower end of the precast segment (3) is provided with a hand hole groove (31), the lower end of the prestressed anchor bar (2) extends into the hand hole groove (31), and the upper end of the prestressed anchor bar (2) extends out from the upper end of the precast segment (3) and forms a connecting end. The sinking control device (1) includes a fixed frame (11), a lifting steel frame (12), and a lifting cylinder (13). The lifting cylinder (13) is disposed between the fixed frame (11) and the lifting steel frame (12) and is used to drive the lifting steel frame (12) to move up and down. The lifting steel frame (12) is used to connect with the prestressed anchor bar (2). The fixed frame (11) includes a base (111), a sliding column (112) fixed on the base (111), and a sliding rod (113) disposed on the sliding column (112) and movable up and down. The lifting cylinder (13) is disposed between the base (111) and the lifting steel frame (12), and the lifting steel frame (12) is connected to the sliding rod (113). A diagonal brace (114) is provided between the base (111) and the sliding column (112). The sinking control device (1) also includes a cylinder protection barrel (14) that is vertically arranged and open at the bottom. The cylinder body of the lifting cylinder (13) is connected to the fixed frame (11). The piston rod of the lifting cylinder (13) extends into the cylinder protection barrel (14) and is connected to the bottom of the cylinder protection barrel (14). The lifting steel frame (12) is detachably connected to the prestressed anchor bar (2) via a connecting seat (15); The connecting seat (15) includes a lifting ring (151), an ear plate (152), an anchor plate (153), and a plug rod (154). The lifting ring (151) and the ear plate (152) are sleeved on the plug rod (154). The lifting ring (151) is connected to the lifting steel frame (12). The ear plate (152) is connected to the anchor plate (153). The anchor plate (153) is provided with anchor holes for the prestressed anchor bar (2) to pass through.

2. The prefabricated caisson construction device according to claim 1, characterized in that, The fixing frame (11) also includes a counterweight (115), which is connected to the base (111).

3. A method for constructing prefabricated caissons, characterized in that, The prefabricated caisson construction device according to claim 1 or 2 includes the following steps: S1. Excavate the first layer of soil. After the excavation is completed, pour a reinforced concrete ring beam (4). Hoist the precast cutting edge (5) to the predetermined position. Install several sinking control devices (1) along the circumference of the reinforced concrete ring beam (4). S2. Install the first precast segment (3) on the precast cutting edge (5), connect the prestressed anchor bar (2) in the precast cutting edge (5) to the prestressed anchor bar (2) in the precast segment (3), and connect the sinking control device (1) to the upper end of the prestressed anchor bar (2) in the precast segment (3); excavate the soil layer to the specified depth, and use the sinking control device (1) to sink the first section of the well wall to the specified depth; S3. Remove the connection structure between the sinking control device (1) and the prestressed anchor bar (2), control the sinking control device (1) to reset, install the next precast segment (3), connect the prestressed anchor bars (2) between the two adjacent precast segments (3), and connect the sinking control device (1) to the upper end of the prestressed anchor bar (2) in the uppermost precast segment (3); excavate the soil layer to the specified depth, and use the sinking control device (1) to sink the next section of the well wall to the specified depth; S4. Repeat step S3 until the well wall construction is completed.

Images