Novel cofferdam fore shaft structure

Abstract

The utility model discloses a novel cofferdam fore shaft structure which comprises a male head and two female heads, the male head is of an I-shaped structure, notches are formed in the side walls of the female heads, the two notches are symmetrically formed in the two sides of the male head, the two female heads are distributed on the two sides of the male head, and meanwhile the edges of the male head penetrate through the notches; the female heads and the male heads are arranged in gaps between the adjacent steel pipe piles, and the two female heads are connected with the corresponding steel pipe piles correspondingly. According to the C-I-C type fore shaft steel pipe pile, the construction sequence is optimized, the two adjacent steel pipe piles are firstly sunk to provide the two female heads, and then the connecting I-shaped steel is inserted between the two adjacent female heads, so that the C-I-C type fore shaft steel pipe pile more easily penetrates through the stratum and sinks to the designed elevation, and meanwhile the construction efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of lock ports, and particularly relates to a novel cofferdam lock port structure. Background Technique

[0002] In the construction of projects such as bridge foundations and hydraulic structures, in order to effectively block external water bodies, create a dry working environment for internal construction, and play a role in blocking the surrounding soil in areas with soft soil foundations or unstable geological conditions to prevent soil collapse from entering the construction area, it is necessary to insert multiple steel pipe piles at the construction site to form a cofferdam.

[0003] In order to effectively block the infiltration of river water, lake water or seawater into the construction area and ensure the smooth progress of construction, it is necessary to set a lock port structure between adjacent steel pipe piles. At present, the commonly used lock port forms include four types: C-O type, C-T type, L-T type, and C-C type. Among them, the C-O type lock port can use microorganisms and sediment to enter the lock port gap to form a water-stop layer, but the lock port gap is small, the amount of steel pipe piles used is large, it is difficult to stop water, it is not easy to process after leakage, and the accuracy requirement for jacking is high; the C-T type lock port has a simple structure, is easy to stop water, and the jacking positioning accuracy is relatively lower than that of the C-O type, but special water-stop treatment needs to be carried out on the lock port; the L-T type lock port is easy to stop water, similar to the C-T type, but the lock port processing is complex and accurate positioning is required; the C-C type lock port has a simple structure, but the material consumption is large and it is not easy to stop water.

[0004] In addition, other lock port forms are also recorded in the disclosed technical solutions. For example, a construction method of a lock port steel pipe pile cofferdam disclosed in a Chinese patent with the publication number CN101182717A includes the following steps: ① Processing steel pipe piles: respectively processing male and female buckles on the spiral pipe; ② Connecting the steel pipe columns into an integral steel pipe column along the periphery of the pile cap from the beginning, lifting and positioning each one, and then sinking it to the design position by mechanical assistance; ③ Lock port grouting: lining a cloth bag at the lock port of the male and female buckles and filling the bag with slurry; ④ Setting internal supports for the cofferdam; ⑤ Pouring bottom concrete. From the disclosed content, it is necessary to line a cloth bag at the lock port of the male and female buckles, which means that it takes time to install the lining cloth bag during the construction process, and the construction efficiency will be correspondingly reduced. Content of the Utility Model

[0005] The purpose of the utility model is to provide a novel cofferdam lock port structure, aiming to improve the problem that the lock ports used for cofferdams are not easy to apply.

[0006] The utility model is realized as follows: A novel cofferdam lock port structure includes a male head and two female heads. The male head is set as an I-shaped structure. A notch is provided on the side wall of the female head to form a C-shaped structure. The two notches are symmetrically arranged on both sides of the male head, and a chamfer is provided at the top of the notch.

[0007] The two female heads are distributed on both sides of the male head, and the edge of the male head is provided with a through notch; the female head and the male head are arranged in the gap between adjacent steel pipe piles, and the two female heads are respectively connected to the corresponding steel pipe piles.

[0008] As an embodiment of the present invention, the included angle between the two female heads installed on the steel pipe pile is set to 90° or 180°. When the included angle between the two female heads is 90°, the steel pipe pile is arranged at the top corner of the cofferdam; when the included angle of the female heads is 180°, the steel pipe pile is arranged at the side of the cofferdam.

[0009] As an embodiment of the present invention, the length of the female head is less than the length of the steel pipe pile, and the top surface of the female head is lower than the top surface of the steel pipe pile.

[0010] As an embodiment of the present invention, the length of the female head is half of the length of the steel pipe pile, and the top surface of the female head is 400 MM below the top surface of the steel pipe pile.

[0011] As an embodiment of the present invention, the notch is arranged along the height direction of the female head, and the upper end is set as an opening. [[ID=)15]]

[0012] As an embodiment of the present invention, the width of the notch can be greater than the thickness of the middle section of the male head, and the width of the notch can also be equal to the thickness of the middle section of the male head.

[0013] As an embodiment of the present invention, the end width of the male head is less than the diameter of the female head and greater than the radius of the female head.

[0014] As an embodiment of the present invention, the top surface of the male head can be flush with the top surface of the female head, and the bottom surface of the male head is lower than the bottom surface of the female head.

[0015] As an embodiment of the present invention, cement slurry is injected into the space formed by the female head and the male head, and the cement slurry combines with the sand and soil materials to form a mortar water-stop layer; the water-cement ratio of the cement slurry is 1.0 and it combines with sand and soil. <)

[0016] As an embodiment of the present invention, the female head is welded to the steel pipe pile, or a connecting piece can also be welded between the female head and the steel pipe pile; the connecting piece is arranged along the length direction of the female head, and the length is equal to the length of the female head.

[0017] Compared with the prior art, the beneficial effects of the present invention are:

[0018] 1. The "C-I-C" form lock-joint steel pipe pile provided by the present invention, by optimizing the construction sequence, first sinking two adjacent steel pipe piles to provide two female heads, and then inserting a connecting I-beam between the two adjacent female heads, is more likely to penetrate the formation and sink to the design elevation, while improving the construction efficiency.

[0019] 2. The "C-I-C" type lock-mouth steel pipe pile provided by the present utility model has two female heads at its lock-mouth, providing twice the movable space for connecting the male head of the I-beam compared to the traditional lock-mouth, which is beneficial for controlling the deviation of the support. In addition, for the steel pipe piles at the corner positions, by optimizing the included angle of the seamless steel pipes, the use of steel is reduced and the closure is achieved smoothly.

[0020] 3. The present utility model sets a chamfer at the top of the notch to expand the distance at the top of the notch, facilitating the insertion of the lower end of the male head into the notch of the female head, and at the same time avoiding the influence of the insertion of the male head caused by a slight misalignment of the two notches. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The drawings forming a part of the present utility model are used to provide a further understanding of the present utility model, making other features, objectives, and characteristics of the present utility model more obvious. The schematic embodiments and descriptions of the drawings of the present utility model are used to explain the present utility model and do not constitute an improper limitation of the present utility model.

[0022] Figure 1 is a schematic diagram of the overall structure of the cofferdam of the present utility model;

[0023] Figure 2 is a schematic diagram of the steel pipe pile, female head, and male head of the present utility model Figure 1 ;

[0024] Figure 3 is a schematic diagram of the steel pipe pile, female head, and male head of the present utility model Figure 2 ;

[0025] Figure 4 is a schematic diagram of the structure of the female head and male head of the present utility model;

[0026] Figure 5 is a schematic diagram of the connection of the steel pipe pile, female head, and male head of the present utility model Figure 1 ;

[0027] Figure 6 is a schematic diagram of the connection of the steel pipe pile, female head, and male head of the present utility model Figure 2 ;

[0028] Figure 7 is a schematic diagram of the specific installation of the steel pipe pile, female head, and male head of the present utility model;

[0029] Figure 8 is the fifth schematic diagram of the female head of the present utility model.

[0030] In the figure: steel pipe pile 1; female head 2; notch 21; chamfer 22; male head 3; connecting piece 4; water-stop layer 5. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0032] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If this specific posture changes, the directional indications will also change accordingly.

[0033] The present utility model discloses a cutting table of a disc mower

[0034] When maintaining a foundation pit project with an excavation depth of 6 - 9m, attention should be paid to the waterproof treatment of the foundation pit, especially in areas with a large water content in the soil, such as foundation pits near rivers.

[0035] When the foundation pit needs to be excavated, first, before the construction of the steel pipe pile 1, according to existing materials such as geological exploration reports and design drawings, familiarize with relevant information such as the soil conditions, buried underground pipelines, and underground water levels. Level the site before piling to remove obstacles; the pile driver is pre-run to ensure that the mechanical equipment operates well. Carry out measurement lofting according to the retaining design drawings and pile foundation positioning points, make a measurement point every 5 - 8m, and draw the center line with lime. Conduct a trial pile driving before the formal construction to check whether parameters such as the penetration elevation, pressure index, and mechanical load of the steel pipe pile 1 meet the requirements.

[0036] In order to block the gaps between adjacent steel pipe piles 1, a locking structure needs to be formed between adjacent steel pipe piles 1. Specifically, a "C-steel-C" type locking steel pipe pile 1 support is fabricated. The single body of the steel pipe pile 1 is a 12m long and φ630*12mm spiral pipe. On the φ630*12mm spiral pipe, two 6m long and φ168*10mm steel pipes (hereinafter referred to as the female head 2) are provided. A notch 21 is provided on the side wall of the female head 2. The top surface of the steel pipe is 400mm below the top surface of the spiral pipe pile, and it can also be at different positions according to actual needs. Insert a male head 3, a 25a I-beam (hereinafter referred to as the male head 3) between the two female heads 2, that is, the edge of the I-beam penetrates through the notch 21 to form a new type of "C-steel-C" lock. A chamfer 22 is provided at the top of the notch 21 to increase the distance at the top of the notch 21 and facilitate the insertion of the male head 3 into the notch 21.

[0037] Because the cofferdam is generally a closed structure and its shape can be rectangular, in order to make the female head 2 and the male head 3 adapt to the edges and corners of the cofferdam, the included angle of the female heads 2 located on the same steel pipe pile 1 can be set to 90°. In this case, the steel pipe pile 1 is located at the top corner of the cofferdam. It is also possible to set the included angle of the female heads 2 located on the same steel pipe pile 1 to 180°, that is, the two female heads 2 are located on the same diameter of the steel pipe pile 1. In this case, the steel pipe pile 1 is located on the side of the cofferdam.

[0038] In order to stably connect the female head 2 to the steel pipe pile 1, welding technology can be used to directly weld and install the female head 2 on the steel pipe pile 1. Since both the steel pipe pile 1 and the female head 2 are curved surface structures, welding is rather troublesome. Therefore, a connecting piece 4 can be installed between the female head 2 and the steel pipe pile 1 by welding technology. The connecting piece 4 is set as a steel plate, and the connecting piece 4 is arranged along the length direction of the female head 2 and has the same length as the female head 2. At this time, a larger welding operation space is formed during welding.

[0039] In order to enable the male head 3 to be connected to the female head 2 and provide sufficient movement space for the male head 3, which is beneficial to controlling the support deviation. The width of the notch 21 is greater than or equal to the thickness of the middle section of the male head 3, and the width of the end of the male head 3 is less than the diameter of the female head 2 and greater than the radius of the female head 2. With this setting, it is convenient to adjust the position of the male head 3 according to actual needs to make it adapt to the steel pipe pile.

[0040] After the steel pipe pile 1 is fabricated, according to the coordinates of the laid-out control points, calculate the coordinate positions. After leveling the site near the pile position, use a total station to set out the pile position, measure the ground elevation with a level, and determine the pile-forming depth. During the construction of the steel pipe pile 1, the pile head must be correctly positioned and vertical. The alignment is controlled by a laser pointer to ensure the overall stability after pile formation. During the pile sinking process, detect at any time, and deal with problems in a timely manner. The allowable deviation of pile sinking: longitudinally 100 mm in the plane position, and -50 to 0 mm transversely; the verticality is ≤ 0.5%. Take out the laser instrument and set it up at the measurement point of the construction layout. Adjust the laser instrument so that the infrared ray emitted by the laser instrument coincides with the planned normal line and the infrared ray elevation is equal to the pile top elevation.

[0041] At the initial stage of pile pressing, the steel pipe pile 1 is used as a counterweight to apply the reaction force, and the steel pipe piles 1 are vertically placed on both sides of the reaction base of the static pressure pile driver. Set the reaction counterweight according to the penetration of the steel pipe pile 1. Level the construction site of the steel pipe pile 1 to make the flatness meet the construction requirements. Use a 25t crane to place the center point of the static pressure pile driver on the reaction base and use a clamp to clamp the reaction base. Install the static pressure pile driving equipment on the reaction base. The center line of the reaction base body is parallel to the planned normal line, and the distance between the base and the rear lock of the first pressed pile is between 10 and 20 cm. Adjust the deviation to make the main body of the static pressure pile driver horizontal, and then lift the counterweight to both sides of the reaction force base. The counterweight can be a precast block or a steel pipe pile 1

[0042] Horizontally set the static pressure pile driver on the reaction force base. According to the soil conditions and the length of the steel pipe pile 1, place the reaction force weights on both sides of the reaction force base, and use their total mass as the reaction force to press the first steel pipe pile 1 into the ground. Lift the steel pipe pile 1 and fix it in the chuck of the static pressure pile driver, and use the static load to rotate and cut the structural pile body (steel pipe pile 1 with a top drill bit) into the ground. After each pressing operation, make the static pressure pile driver move forward by self-propulsion, successively grasp the completed piles that have been implanted, and move the fuselage completely onto the initial reaction force pile.

[0043] Adopt the method of pressing the first pile in a cycle for construction, and successively press the first 4 steel pipe piles 1, so that the clamps of the static pressure pile driver can firmly hold the steel pipe pile 1, meeting the conditions for the pile driver to self-walk and press piles. After meeting the conditions for self-walking and pressing piles, remove the steel pipe piles 1 on both sides of the base, then remove the reaction force weights, and then remove the reaction force base. Erect the No. 5 steel pipe pile 1, install the chuck accessory device, and press the steel pipe pile 1 to the planned normal line. Grasp the upper part of the chuck accessory device, confirm the supporting force of the No. 5 steel pipe pile 1, raise the fuselage, move forward, after walking the length of one steel pipe pile 1, lower the fuselage to complete self-walking. Lift off the chuck accessory device. Repeat the above steps to complete the pressing of the steel pipe piles 1 for the entire cofferdam.

[0044] After two adjacent steel pipe piles 1 are statically positioned, each provides 1 female end, and insert an I-beam between the two female ends to form a "C-I-C" lock joint. When inserting the I-beam, first use a steel wire rope to loop around the excavator, and then drive the steel sheet pile into the soil after lifting the steel sheet pile upright to prevent it from slipping.

[0045] Adopt the method of mixing cement slurry with a water-cement ratio of 1.0 on-site and injecting it into the lock joint through an air compressor. The cement slurry combines with the sandy soil material stored in the lock joint to form a cement mortar water-stop layer with good water-stop performance, and the water-stop effect is good.

[0046] After reasonably improving the above technical method for the traditional lock-joint steel pipe pile, a new type of "C-I-C" form lock-joint steel pipe pile is obtained. By optimizing the construction sequence, first sink two adjacent steel pipe piles to provide two female ends, and then insert a connecting I-beam between the two adjacent female ends, which is easier to penetrate the formation and sink to the design elevation, while improving the construction efficiency. Due to the two female ends of its lock joint, the "C-I-C" type lock-joint steel pipe pile provides twice the movable space for the male end of the connecting I-beam compared to the traditional lock joint, which is beneficial to controlling the deviation of the support. In addition, for the steel pipe piles at the corner positions, by optimizing the included angle of the seamless steel pipes, the use of steel is reduced and the closure is achieved smoothly.

[0047] The above-described embodiments merely represent several implementation manners of the present utility model. The description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and these all fall within the protection scope of the present utility model. Therefore, the protection scope of the present utility model shall be subject to the appended claims.

Claims

1. A new cofferdam lock structure, characterized in that: It comprises a male head (3) and two female heads (2), wherein the male head (3) is arranged in an I-shaped structure, and a notch (21) is arranged on the side wall of the female head (2) to form a C-shaped structure, the two notches (21) are symmetrically arranged on both sides of the male head (3), and the top of the notch (21) is provided with a chamfer (22); The two female heads (2) are distributed on both sides of the male head (3), and the edge of the male head (3) is provided through the notch (21); the female head (2) and the male head (3) are provided in the gap between adjacent steel pipe piles (1), and the two female heads (2) are respectively connected to the corresponding steel pipe piles (1).

2. A novel cofferdam locking structure according to claim 1, characterized in that: The included angle of the two female heads (2) installed on the steel pipe pile (1) is set to 90° or 180°. When the included angle of the two female heads (2) is 90°, the steel pipe pile (1) is set at the top corner of the cofferdam; when the included angle of the female heads (2) is 180°, the steel pipe pile (1) is set at the side of the cofferdam.

3. A novel cofferdam locking structure according to claim 1, characterized in that: The length of the female head (2) is less than the length of the steel pipe pile (1), and the top surface of the female head (2) is lower than the top surface of the steel pipe pile (1).

4. A novel cofferdam locking structure according to claim 3, characterized in that: The length of the female head (2) is half the length of the steel pipe pile (1), and the top surface of the female head (2) is 400 mm below the top surface of the steel pipe pile (1).

5. A novel cofferdam locking structure according to claim 4, characterized in that: The notch (21) is arranged along the height direction of the female head (2), and the upper end is arranged to be open.

6. The novel cofferdam locking structure according to claim 1 is characterized in that: The width of the notch (21) may be greater than the thickness of the middle section of the male connector (3), and the width of the notch (21) may also be equal to the thickness of the middle section of the male connector (3).

7. The novel cofferdam locking structure according to claim 1 is characterized in that: The width of the end of the male head (3) is smaller than the diameter of the female head (2) and larger than the radius of the female head (2).

8. The novel cofferdam locking structure according to claim 1 is characterized in that: The top surface of the male connector (3) can be flush with the top surface of the female connector (2), and the bottom surface of the male connector (3) is lower than the bottom surface of the female connector (2).

9. The novel cofferdam locking structure according to claim 1 is characterized in that: The female head (2) is welded to the steel pipe pile (1), and a connecting piece (4) is welded between the female head (2) and the steel pipe pile (1). The connecting piece (4) is arranged along the length direction of the female head (2) and has a length equal to that of the female head (2).

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