Supporting mechanism suitable for cofferdam foundation pit and construction method

Abstract

The invention relates to a supporting mechanism suitable for a cofferdam foundation pit and a construction method.The supporting mechanism comprises an upper supporting piece and a lower supporting piece, the upper supporting piece and the lower supporting piece are rotationally connected through a rotary connecting piece, the periphery of the connecting position of the upper supporting piece and the lower supporting piece through the rotary connecting piece is sleeved with a sleeve, and the sleeve is composed of a first pipe part and a second pipe part; one end of the first pipe part is rotationally connected with one end of the second pipe part, a bolt pin penetrates through the other end of the first pipe part and the other end of the second pipe part to lock the first pipe part and the second pipe part, the top end of the bolt pin is connected with one end of a lifting rope, and the supporting mechanism is suitable for supporting an enclosure structure of a cofferdam foundation pit.

Description

Technical Field

[0001] The invention relates to the technical field of cofferdam construction, and in particular to a supporting mechanism and a construction method suitable for a cofferdam foundation pit. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, horizontally arranged steel supports are mostly used as supporting structures in cofferdam foundation pit support projects. However, when supporting larger cofferdam projects, the steel supports often have too large spans, complex forces, and poor stability, which requires increasing the diameter of the steel supports or applying lattice columns to meet the support requirements, resulting in unnecessary waste. The use of diagonal braces in the vertical plane can effectively solve the above problems. For example, patent CN222161298U discloses a single-sided riverside foundation pit reinforcement device. When the above patent scheme is used, the bottom end of the diagonal brace is fixedly connected to a fixed base in a concrete cushion layer. When this scheme is applied to cofferdam construction, due to the presence of water in the cofferdam, the connection between the diagonal brace and the fixed base cannot be constructed. Therefore, the above patent scheme cannot be applied to the construction of the cofferdam. Summary of the invention

[0004] In view of the deficiencies in the prior art, an object of the present invention is to provide a support mechanism and a construction method suitable for a cofferdam foundation pit, wherein the support mechanism is suitable for serving as an oblique support for the cofferdam.

[0005] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0006] In the first aspect, an embodiment of the present invention provides a support mechanism suitable for a cofferdam foundation pit, comprising an upper support member and a lower support member, wherein the upper support member and the lower support member are rotatably connected via a rotating connection member, and a sleeve is sleeved around the upper support member and the lower support member at a connection position via the rotating connection member, and the sleeve consists of a first tube portion and a second tube portion, one end of the first tube portion and the second tube portion are rotatably connected, and a pin is passed through the other ends to lock the first tube portion and the second tube portion, and the top end of the pin is connected to one end of a pulling rope.

[0007] Optionally, both the upper support member and the lower support member are made of steel pipes, and the pipe wall of the lower support member is provided with a plurality of exhaust holes.

[0008] Optionally, the plurality of exhaust holes are distributed along the axial direction of the lower steel pipe, and adjacent exhaust holes are staggered.

[0009] Optionally, the rotating connecting member includes a ball head and a ball head seat, the ball head seat is provided with a ball groove matching the ball head, the ball head is embedded in the ball groove and is slidably connected to the groove surface of the ball groove.

[0010] Optionally, the area of the ball groove wrapping the ball head is greater than one - half of the area of the ball head to prevent the ball head from detaching from the ball groove.

[0011] Optionally, an anti - detachment member is provided at the bottom end of the bolt passing through the first pipe portion and the second pipe portion.

[0012] Optionally, the anti - detachment member is a rubber ring, and the rubber ring is sleeved in an annular groove provided at the bottom end of the bolt.

[0013] Optionally, a lifting ring is provided at the top of the bolt, and the top of the bolt is connected to the bottom end of a lifting rope through the lifting ring.

[0014] Optionally, one end of the first pipe portion and the second pipe portion is rotatably connected. A first convex block and a second convex block are provided at the other end of the first pipe portion, and a third convex block matching the gap between the first convex block and the second convex block is provided at the other end of the second pipe portion. Through holes matching the bolt are provided on the first convex block, the second convex block, and the third convex block.

[0015] In a second aspect, an embodiment of the present invention provides a construction method for the support mechanism applicable to the cofferdam foundation pit described in the first aspect, including the following steps:

[0016] Adjust the upper support member and the lower support member to a coaxial state through a rotating connector. Sleeve a casing at the connection position of the upper support member and the lower support member, and insert a bolt between the ends of the first pipe portion and the second pipe portion of the casing;

[0017] Drive the support mechanism applicable to the cofferdam foundation pit into the set target position of the cofferdam foundation.

[0018] After the lower support member enters the set depth of the foundation, lift the bolt through the lifting rope. The bolt is pulled out of the first pipe portion and the second pipe portion, and shake the upper support member to make the casing fall off;

[0019] Rotate the upper support member and fix the end of the upper support member to the enclosure structure of the cofferdam.

[0020] The beneficial effects of the present invention are as follows:

[0021] 1. For the support mechanism and construction method of the present invention, the lower support member can be inserted into the foundation. After the upper support member is rotated, its end is fixed to the enclosure structure of the cofferdam. Using the upper support member as an inclined strut overcomes the defects existing in the use of horizontal supports. The lower support member can be driven into the foundation by using existing equipment above the water surface of the cofferdam. The entire support mechanism is directly constructed above the water surface without underwater construction operations, realizing the application of inclined struts in cofferdam supports.

[0022] 2. The support mechanism and construction method of the present invention. The lower support member and the upper support member are connected by a ball head and a ball groove. The upper support member can rotate 360°, meeting the requirements of supporting in different directions, and the entire support mechanism has strong applicability.

[0023] 3. The support mechanism and construction method of the present invention. The lower support member is vertically driven into the foundation, and after the upper support member rotates, its end is fixed to the enclosure structure of the cofferdam for construction. When it is necessary to adjust the angle between the inclined support and the enclosure structure, only the length of the upper support member needs to be adjusted, realizing the construction of multiple support mechanisms, without increasing the space occupied by the inclined support inside the foundation pit and without affecting the construction space.

[0024] 4. The support mechanism and construction method of the present invention. Through the setting of the casing, it can ensure that the upper support member and the lower support member always maintain a coaxial state during the driving process, guaranteeing the smooth construction of the work of driving into the foundation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The schematic diagrams in the specification forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention.

[0026] Figure 1 It is a schematic diagram of the overall structure of Embodiment 1 of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the rotating connector in Embodiment 1 of the present invention;

[0028] Figure 3 It is a front view of the closed state of the casing in Embodiment 1 of the present invention;

[0029] Figure 4 It is a top view of the closed state of the casing in Embodiment 1 of the present invention;

[0030] Figure 5 It is a schematic diagram of the open state of the casing in Embodiment 1 of the present invention;

[0031] Figure 6 It is a schematic diagram of the structure of the bolt in Embodiment 1 of the present invention;

[0032] Figure 7 It is a schematic diagram of the construction completion state of Embodiment 2 of the present invention;

[0033] Among them, 1. upper steel pipe, 2. rotating connector, 3. casing, 4. bolt, 5. rubber ring, 6. steel wire rope, 7. exhaust hole, 8. lower steel pipe, 9. foundation, 10. steel sheet pile;

[0034] 2-1. ball head, 2-2. ball head seat;

[0035] 3-1. First pipe section, 3-2. Second pipe section, 3-3. First bump, 3-3. Second bump, 3-5. Third bump;

[0036] 4-1. Pulling ring, 4-2. Annular groove. Specific implementation mode

[0037] Embodiment 1

[0038] This embodiment provides a support mechanism applicable to a cofferdam foundation pit. As Figure 1 shown, it includes an upper support member and a lower support member. There is a rotating connection member 2 between the bottom end of the upper support member and the top end of the lower support member. The upper support member and the lower support member can rotate relative to each other through the rotating connection member 2. An outer sleeve 3 is sleeved on the outer periphery of the upper support member and the lower support member at the connection position. The top end of the sleeve 3 extends to a set position of the upper support member, and the bottom end of the sleeve 3 extends to a set position of the lower support member. The sleeve 3 is composed of a first pipe section 3-1 and a second pipe section 3-2. The first pipe section 3-1 and the second pipe section 3-2 have the same shape and enclose the entire sleeve 3. One side of the first pipe section 3-1 and the second pipe section 3-2 is rotatably connected, and a bolt 4 is inserted into the other side of the first pipe section 3-1 and the second pipe section 3-2. The first pipe section 3-1 and the second pipe section 3-2 are locked and fixed by the bolt 4 to prevent the first pipe section 3-1 and the second pipe section 3-2 from rotating and opening. When the first pipe section 3-1 and the second pipe section 3-2 are in the locked state, they can be pressed against the surfaces of the upper support member and the lower support member.

[0039] In this embodiment, both the upper support member and the lower support member are made of steel pipes. The upper support member is the upper steel pipe 1, and the lower support member is the lower steel pipe 8. The specifications of the upper steel pipe 1 and the lower steel pipe 8 can be determined according to the actual engineering conditions and will not be described in detail here.

[0040] A plurality of exhaust holes 7 are provided on the pipe wall of the lower steel pipe 8. The plurality of exhaust holes 7 are distributed along the axial direction of the lower steel pipe 8, and adjacent exhaust holes 7 are staggered so that the plurality of exhaust holes 7 are distributed in a plum blossom shape. Through the exhaust holes 7, it is ensured that gas and water can be discharged through the exhaust holes during the process of driving the lower steel pipe 8 into the foundation 9.

[0041] As Figure 2 shown, the rotating connection member includes a ball head 2-1 and a ball head seat 2-2. One side of the ball head 2-1 is provided with a connecting pipe. The ball head 2-1 is integrally connected with the connecting pipe, and the connecting pipe is welded and fixed to the bottom end of the upper steel pipe 1. The ball head seat 2-2 is welded and fixed to the top end of the lower steel pipe 8. The ball head seat 2-2 is provided with a spherical groove matching the ball head 2-1. The ball head 2-1 is embedded in the spherical groove and is slidably connected to the groove surface of the spherical groove. In this way, the upper steel pipe 1 and the lower steel pipe 8 can rotate relative to each other in any direction, and the upper steel pipe 1 can swing at an angle of ±45° relative to the lower steel pipe 8.

[0042] The upper steel pipe 1 can rotate in any direction relative to the lower steel pipe 8. Therefore, no matter in which direction the enclosure structure of the cofferdam is, it can ensure the connection between the upper steel pipe 1 and the enclosure structure, which can play a good supporting role. Moreover, by adopting this method, the construction relative position requirements for the upper steel pipe 1 and the lower steel pipe 8 are reduced, thereby reducing the construction difficulty.

[0043] Furthermore, in order to prevent the ball head 2-1 from detaching from the spherical groove, the wrapping area of the spherical groove surface for the ball head 2-1 is greater than half of the surface area of the ball head 2-1. By adopting this method, the spherical groove is used to limit the ball head, and the ball head 2-1 will not detach from the spherical groove.

[0044] A casing 3 is sleeved on the outer periphery of the connection position between the upper steel pipe 1 and the lower steel pipe 8, that is, the casing 3 is sleeved on the set part at the bottom end of the upper steel pipe 1, the set part at the top end of the lower steel pipe 8, and the outer periphery of the rotating connector 2. The length of the casing 3 is determined according to the lengths of the upper steel pipe 1 and the lower steel pipe 8. The longer the lengths of the upper steel pipe 1 and the lower steel pipe 8 are, the longer the length of the casing 3 is correspondingly, ensuring the stability of the connection between the upper steel pipe 1 and the lower steel pipe 8.

[0045] Preferably, the casing 3 is made of a steel pipe.

[0046] As Figures 3 - 5 shown, the casing 3 is formed by enclosing two pipe parts with the same shape and completely symmetrical with respect to the center line of the casing 3. The two pipe parts are respectively a first pipe part 3-1 and a second pipe part 3-2. One ends of the first pipe part 3-1 and the second pipe part 3-2 are rotationally connected by a hinge or a hinge, and the first pipe part 3-1 and the second pipe part 3-2 can perform opening and closing movements.

[0047] A bolt 4 is inserted into the other ends of the first pipe part 3-1 and the second pipe part 3-2. The bolt 4 can lock and fix the first pipe part 3-1 and the second pipe part 3-2 in the closed state to prevent the first pipe part 3-1 and the second pipe part 3-2 from opening.

[0048] Specifically, one ends of the first pipe part 3-1 and the second pipe part 3-2 are rotationally connected. The edge of the other end of the first pipe part 3-1 is provided with a first convex block 3-3 and a second convex block 3-4. The first convex block 3-3 and the second convex block 3-4 are arranged at intervals, forming a certain space therebetween. The edge of the other end of the second pipe part 3-2 is provided with a third convex block 3-5 that matches the space between the first convex block 3-3 and the second convex block 3-4.

[0049] When the first pipe part 3-1 and the second pipe part 3-2 are closed, the third convex block 3-5 can extend into the space between the first convex block 3-3 and the second convex block 3-4.

[0050] The first bump 3-3, the second bump 3-4 and the third bump 3-5 are provided with corresponding locking holes. When the first pipe portion 3-1 and the second pipe portion 3-2 are in a closed state, the locking holes on the first bump 3-3, the second bump 3-4 and the third bump 3-5 are aligned. The locking holes are matched with the pin 4, and the pin 4 can pass through the first bump 3-3, the second bump 3-4 and the third bump 3-5 through the locking holes, so as to lock and fix the first pipe portion 3-1 and the second pipe portion 3-2 in the closed state.

[0051] As Figure 6 shown, a lifting ring 4-1 is provided at the top of the pin 4, and one end of the lifting ring 4-1 is connected to one end of a lifting rope. Construction workers can pull out the pin through the lifting rope.

[0052] In this embodiment, the lifting rope can be made of a steel wire rope 6. It can be understood that other types of ropes can also be used for the lifting rope, and those skilled in the art can set it according to actual needs.

[0053] By providing the lifting ring 4-1, on the one hand, the top of the pin 4 can be connected to the lifting rope, and on the other hand, the lifting ring 4-1 plays a limiting role to prevent the pin 4 from falling downward from the locking hole.

[0054] A part of the pin 4 extending below the second bump 3-4 is provided with an anti-detachment member to prevent the detachment of the pin during the process of pressing the entire support mechanism into the foundation.

[0055] In this embodiment, the anti-detachment member is a rubber ring 5. The rubber ring 5 is sleeved on the outer periphery of an annular groove 4-2 provided on the surface of the pin 4. The rubber ring 5 can contact the bottom end of the casing 3. The rubber ring has elasticity. During installation, radial tension is generated by extrusion, tightly wrapping the pin, increasing the frictional force between interfaces, thereby resisting the axial movement of the pin. And the outer diameter of the rubber ring is larger than the outer diameter of the pin to prevent the overall detachment of the pin. Furthermore, the falling of the casing is avoided, and the problem that the upper steel pipe 1 and the lower steel pipe 8 deviate during the driving process of the support mechanism and finally the support mechanism cannot be driven into the foundation is avoided.

[0056] Embodiment 2

[0057] This embodiment provides a construction method of the support mechanism applicable to a cofferdam foundation pit described in Embodiment 1. As Figure 7 shown, it includes the following steps:

[0058] Step 1: Assemble the entire support mechanism. Weld and fix the upper steel pipe 1 to the ball head 2-1, and weld and fix the lower steel pipe 8 to the ball head seat 2-2. Adjust the upper steel pipe 1 and the lower steel pipe 8 to be coaxial. Sleeve the casing 3 on the outer periphery of the connection position of the upper steel pipe 1 and the lower steel pipe 8. After closing the first pipe portion 3-1 and the second pipe portion 3-2, insert the bolt 4 into the locking holes of the three bumps. At this time, the first pipe portion and the second pipe portion clamp the junction position of the upper steel pipe and the lower steel pipe. Slip on the rubber ring 5 at the bottom of the bolt 4. At this point, the assembly of the entire support mechanism is completed.

[0059] Step 2: According to the actual requirements of the cofferdam foundation pit enclosure, pre-position in the foundation pit to locate the position where the support mechanism is pressed into the foundation.

[0060] Step 3: Lift the assembled support mechanism to the target position by a lifting device. The lifting device can be an existing device and will not be described in detail here.

[0061] Step 4: Use a driving device to drive the entire support mechanism into the pre-located position in the cofferdam foundation pit foundation, so that the lower steel pipe 8 is driven into the foundation. The driving device can be an existing device and will not be described in detail here. During the driving process, conduct observations to prevent deviations during driving.

[0062] During the driving process, due to the setting of the casing 3, the upper steel pipe 1 and the lower steel pipe 8 can always maintain a coaxial state during the driving process, ensuring the smooth construction of the work of driving into the foundation.

[0063] Step 5: After the lower steel pipe 8 is driven to the set depth, stop driving the support mechanism. Lift the bolt 4 by the steel wire rope 6. During the lifting process, the rubber ring 5 contacts the bottom surface of the casing 3, and the rubber ring 5 cannot be lifted and is damaged. After the bolt is pulled out, the locking state of the first pipe portion 3-1 and the second pipe portion 3-2 is released. Shake the upper steel pipe 1 to make the casing 3 fall off. The upper steel pipe 1 swings by a set angle and approaches the enclosure structure of the cofferdam, and then weld and fix the top end of the upper steel pipe to the enclosure structure of the cofferdam.

[0064] In this embodiment, the enclosure structure uses retaining piles, such as steel sheet piles, bored cast-in-place piles, diaphragm walls, etc. Preferably, the existing steel sheet piles 10 are used and will not be described in detail here.

[0065] With the support mechanism and construction method of the present invention, the lower steel pipe 8 can be inserted into the foundation. After the upper steel pipe 1 rotates, its end is fixed to the enclosure structure of the cofferdam. Using the upper steel pipe 1 as a diagonal brace overcomes the defects existing in the use of horizontal supports. The lower steel pipe 8 can be driven into the foundation by using the existing equipment above the water surface of the cofferdam. The upper steel pipe 1 is pre-connected to the lower steel pipe 8 through a rotating connector 2, eliminating the need for underwater construction operations, realizing the application of the diagonal brace in the cofferdam support. Moreover, the lower steel pipe 8 is vertically driven into the foundation, and the end of the upper steel pipe 1 is fixed to the enclosure structure of the cofferdam after rotation for construction. There is no need to set up driving equipment at the top of the enclosure structure, and the end of the upper steel pipe 1 does not need to be fixed at the top of the enclosure structure. When it is necessary to adjust the angle between the diagonal brace and the enclosure structure, only the length of the upper steel pipe needs to be controlled according to actual needs, which will not increase the space occupied by the diagonal brace inside the foundation pit and will not affect the construction space.

[0066] In this embodiment, the upper steel pipe 1, the rotating connector 2, the lower steel pipe 8, the casing 3, the bolt 4, the steel wire rope 6, etc. can all be reused, effectively reducing the project cost.

[0067] The above are only the preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A support mechanism applicable to a cofferdam foundation pit, characterized in that, It includes an upper support member and a lower support member. The upper support member and the lower support member are rotatably connected by a rotating connecting member. A sleeve is sleeved around the connection position of the upper support member and the lower support member through the rotating connecting member. The sleeve is composed of a first pipe portion and a second pipe portion. One end of the first pipe portion and the second pipe portion is rotatably connected, and a bolt passes through between the other ends to lock the first pipe portion and the second pipe portion. The top end of the bolt is connected to one end of a lifting rope.

2. The support mechanism applicable to the cofferdam foundation pit according to claim 1, characterized in that, Both the upper support member and the lower support member are made of steel pipes, and a plurality of exhaust holes are provided on the pipe wall of the lower support member.

3. The support mechanism for a cofferdam foundation pit according to claim 2, characterized in that, The plurality of exhaust holes are distributed along the axial direction of the lower steel pipe, and adjacent exhaust holes are arranged staggeredly.

4. The support mechanism applicable to the cofferdam foundation pit according to claim 1, characterized in that, The rotating connecting member includes a ball head and a ball head seat. The ball head seat is provided with a ball groove matching the ball head. The ball head is embedded in the ball groove and is slidably connected to the groove surface of the ball groove.

5. The support mechanism applicable to the cofferdam foundation pit according to claim 4, characterized in that The area of the ball groove wrapping the ball head is greater than half of the area of the ball head to prevent the ball head from detaching from the ball groove.

6. The support mechanism applicable to the cofferdam foundation pit as described in claim 1 is characterized in that, An anti-detachment member is provided at the bottom end of the bolt passing through the first pipe portion and the second pipe portion.

7. The support mechanism applicable to the cofferdam foundation pit according to claim 6, characterized in that, The anti-detachment member is a rubber ring, and the rubber ring is sleeved in an annular groove provided at the bottom end of the bolt.

8. The support mechanism applicable to the cofferdam foundation pit according to claim 1, characterized in that, A lifting ring is provided at the top of the bolt, and the top of the bolt is connected to the bottom end of the lifting rope through the lifting ring.

9. The support mechanism applicable to the cofferdam foundation pit according to claim 1, characterized in that, One end of the first pipe portion and the second pipe portion is rotatably connected. The other end of the first pipe portion is provided with a first convex block and a second convex block. The other end of the second pipe portion is provided with a third convex block matching the gap between the first convex block and the second convex block. The first convex block, the second convex block, and the third convex block are all provided with through holes matching the bolt.

10. A construction method of the support mechanism applicable to the cofferdam foundation pit according to any one of claims 1-9, characterized in that, It includes the following steps: Adjust the upper support member and the lower support member to a coaxial state through the rotating connecting member. Sleeve the sleeve at the connection position of the upper support member and the lower support member, and insert the bolt between the ends of the first pipe portion and the second pipe portion of the sleeve. Drive the support mechanism applicable to the cofferdam foundation pit into the set target position of the cofferdam foundation. After the lower support member enters the set depth of the foundation, lift the bolt through the lifting rope. The bolt is pulled out of the first pipe portion and the second pipe portion, and shake the upper support member to make the sleeve fall off. Rotate the upper support member and fix the end of the upper support member to the retaining structure of the cofferdam.

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