Positioning and guiding fine adjustment device for overall sinking of double-wall steel cofferdam

Abstract

The utility model provides a positioning, guiding and fine adjusting device for integral sinking of a double-wall steel cofferdam. An inner guiding unit corresponds to a pile foundation steel casing in position; one end of the connecting support profile steel is welded on the inner wall of the double-wall steel cofferdam, and the other end of the connecting support profile steel is connected with the guide steel plate; the guide steel plate is an arc-shaped sheet metal part; the wedge-shaped block is welded at the bottom of the inner guide unit; the middle positioning unit is composed of a first positioning steel casing and a positioning circular ring, the first positioning steel casing is arranged on the outer side of the downstream of the double-wall steel cofferdam, and the top end of the positioning circular ring abuts against the outer side face of the double-wall steel cofferdam; the upper fine adjustment unit is composed of a second positioning steel casing, an outer guide block, a jack and an outer guide platform. The device is simple in structure, low in manufacturing cost and capable of guiding and positioning the double-wall steel cofferdam when the double-wall steel cofferdam sinks integrally, and meanwhile, the position of the double-wall steel cofferdam can be finely adjusted through the jack so as to meet the sinking precision requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of cofferdam construction, in particular to a positioning and guiding fine-tuning device for the integral sinking of a double-wall steel cofferdam. Background Technique

[0002] With the rapid development of bridge construction technology, more and more breakthroughs have been achieved in the construction techniques of key and difficult foundation projects. Among them, the deep-water foundation project, especially the double-wall steel cofferdam construction technology, has become increasingly mature. In the construction organization of the pile caps and piers of various deep-water large bridges, the double-wall steel cofferdam construction has become the only choice after comprehensive consideration in all aspects.

[0003] In a special situation where there is a 110KV high-voltage wire above the bridge site, it will bring some adverse effects to the double-wall steel cofferdam construction. Due to the 110KV high-voltage wire above the bridge site, the site does not have the condition for the entry of large floating cranes. Therefore, the double-wall steel cofferdam construction can only adopt the traditional construction process of segmenting and assembling in situ in sections and blocks. The existing construction steps for in-situ assembling are as follows: demolish the drilling platform, weld and assemble brackets on the steel casing, and perform the overall assembly of the bottom side plates on the assembled brackets; install the bottom internal support, extend the steel casings at the four corners of the pile cap and install hanging equipment; install the guiding device under the cofferdam, and slowly lower the steel cofferdam to the self-floating state by using the hanging equipment; assemble and extend the second layer of the cofferdam and the corresponding internal support in sections, pour the concrete for the cutting edge and the wall cabin, and lower it underwater; sequentially assemble the subsequent side wall sections and internal support in sections, inject water, suck mud and lower it to level, pour the bottom-sealing concrete. After the bottom-sealing concrete reaches the design strength, pump out the water and chisel the pile head, construct the pile cap and the pier body. After the construction of the pier body is completed, backfill the water and demolish the cofferdam.

[0004] Adopting the above-mentioned in-situ assembling construction process for the double-wall steel cofferdam, after the drilling platform is demolished, it is necessary to install and assemble brackets and a hanging system, and the side walls of the cofferdam need to be assembled in sections and blocks. The processes are cumbersome and complex, the construction period is long, the resource input is greatly increased, the construction cost is high, and it causes the construction period of the subsequent pile cap, pier body and superstructure to be tense. Therefore, there is an urgent need in the field to provide a rapid construction and installation process suitable for the double-wall steel cofferdam under high-voltage lines to solve the deficiencies in the prior art.

[0005] In order to solve the above-mentioned deficiencies in the prior art, the applicant provides a construction method for a double-wall steel cofferdam with pile foundation first and then cofferdam floating transportation, which can solve the problems of cumbersome and complex processes, long construction period, high construction cost, and tight construction period existing in the in-situ scattered assembly construction technology of double-wall steel cofferdams under high-voltage lines. It has the advantages of short construction period, convenient and fast installation and construction, and low construction cost. However, in the above construction technology, since it is necessary to float the assembled double-wall steel cofferdam to the pier position, and after floating in place, pour the wall cabin concrete into the double-wall steel cofferdam to make the double-wall steel cofferdam slowly sink; during the sinking process of the double-wall steel cofferdam, it is affected by water flow, waves and its own weight. How to achieve precise control and positioning of the overall sinking process of the double-wall steel cofferdam is an urgent problem to be solved. Utility Model Content

[0006] In order to solve the deficiencies in the prior art, the present utility model provides a positioning and guiding fine-tuning device for the overall sinking of a double-wall steel cofferdam. The device has a simple structure and a low cost, and can achieve guiding and positioning for the overall sinking of the double-wall steel cofferdam. At the same time, its position can also be finely adjusted by a jack to meet the accuracy requirements of sinking.

[0007] The technical solution adopted to achieve the above object of the present utility model is as follows:

[0008] A positioning and guiding fine-tuning device for the overall sinking of a double-wall steel cofferdam, comprising:

[0009] Inner guiding units, provided in multiple groups, corresponding to the positions of the pile foundation steel casings; the inner guiding units are composed of wedge-shaped blocks, connecting support steel profiles, and guiding steel plates. One end of the connecting support steel profile is welded to the inner wall of the double-wall steel cofferdam, and the other end is connected to the guiding steel plate; the guiding steel plate is an arc-shaped sheet metal part that fits the outer wall of the pile foundation steel casing; the wedge-shaped blocks are welded to the bottom of the inner guiding units to facilitate the smooth sinking of the cofferdam and enable the inner guiding units to smoothly abut against the pile foundation steel casings;

[0010] Middle positioning unit, composed of a first positioning steel casing and a positioning ring. The first positioning steel casing is arranged on the outer side of the downstream of the double-wall steel cofferdam, and the positioning ring is fixed on the first positioning steel casing. The top end of the positioning ring abuts against the outer side surface of the double-wall steel cofferdam, and bears the impact of the water flow force on the double-wall steel cofferdam during the sinking process of the double-wall steel cofferdam;

[0011] Upper fine-tuning unit, composed of a second positioning steel casing, outer guiding blocks, jacks and an outer guiding platform. The second positioning steel casings are arranged on both sides of the double-wall steel cofferdam in the direction perpendicular to the water flow; the outer guiding platform is fixed on the second positioning steel casings, and jacks are placed inside it. Outer guiding blocks are arranged at the top ends of the jacks, and the outer guiding blocks are in contact with the side walls of the double-wall steel cofferdam, and the fine-tuning of the double-wall steel cofferdam is carried out through the jacks.

[0012] Furthermore, the guiding steel plate is processed from Q235 steel plate into an arc-shaped sheet metal part that fits the outer wall of the pile foundation steel casing, and the inner diameter of the arc is larger than the outer diameter of the pile foundation steel casing.

[0013] Furthermore, a total of eight groups of the inner guiding units are provided, and two groups are distributed on each side wall of the double-wall steel cofferdam.

[0014] Furthermore, the positioning ring is processed from Q235 steel plate, and its inner diameter is larger than the outer diameter of the first positioning steel casing.

[0015] Furthermore, a plurality of the first positioning steel casings are provided and are evenly arranged on the outer side of the downstream of the double-wall steel cofferdam.

[0016] Furthermore, two positioning rings, upper and lower, are arranged on each of the first positioning steel casings.

[0017] Furthermore, the outer guiding platform is a box-shaped structure processed from profiled steel and steel plates.

[0018] Furthermore, a total of six second positioning steel casings are provided, and three are arranged on each side of the double-wall steel cofferdam in the direction perpendicular to the water flow, and the three second positioning steel casings are evenly arranged.

[0019] Compared with the prior art, the technical solution provided by the present utility model has the following advantages:

[0020] A positioning and guiding fine-tuning device for the overall sinking of a double-wall steel cofferdam provided in the present utility model realizes the rapid and accurate sinking of the double-wall steel cofferdam. The wedge-shaped blocks in the inner guiding unit facilitate the smooth sinking of the cofferdam and enable the guiding steel plate to smoothly abut against the pile foundation steel casing for guiding inside the double-wall steel cofferdam. The middle positioning unit is arranged on the outer side of the downstream of the double-wall steel cofferdam and is used to withstand the impact of the water flow force on the double-wall steel cofferdam during the sinking process of the double-wall steel cofferdam. The upper fine-tuning units are distributed on the left and right sides of the double-wall steel cofferdam, and the position of the double-wall steel cofferdam is finely adjusted by jacks during the sinking process. Through the combination of the above methods in the patent of the present utility model, the rapid and accurate sinking of the double-wall steel cofferdam is realized. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 is a schematic diagram of the overall distribution of the positioning and guiding fine-tuning device of the present utility model;

[0022] Figure 2 is a schematic diagram of the layout of the inner guiding unit;

[0023] Figure 3 is a schematic diagram of the layout of the middle positioning unit;

[0024] Figure 4 is a schematic diagram of the layout of the upper fine-tuning unit;

[0025] In the figure: 4 - double - wall steel cofferdam, 41 - internal support, 6 - steel casing for pile foundation, 8 - internal guiding unit, 81 - wedge block, 82 - guiding steel plate, 9 - middle positioning unit, 91 - first positioning steel casing, 92 - positioning ring, 10 - upper fine - adjustment unit, 101 - jack, 102 - external guiding block, 103 - external guiding platform, 104 - second positioning steel casing. Specific embodiments

[0026] The following combines the drawings and specific embodiments to make a detailed and specific description of the present utility model. However, the protection scope of the present utility model is not limited to the following embodiments.

[0027] The positioning, guiding, and fine - adjustment device for the integral sinking of the double - wall steel cofferdam provided in this embodiment is used in the construction method of the double - wall steel cofferdam for the floating construction of the pile foundation first and then the cofferdam. That is, first build a steel trestle for construction and assemble a floating platform; assemble the bottom - section cofferdam on the floating platform; complete the integral assembly of the double - wall steel cofferdam on the bottom - section cofferdam; synchronously carry out the pile - foundation construction at the pier position, underwater cut the steel casing for the pile foundation, and the top height of the cut steel casing for the pile foundation is lower than the bottom height of the double - wall steel cofferdam; float the assembled double - wall steel cofferdam to the pier position, and after arriving, pour concrete into the wall cabin to make the double - wall steel cofferdam slowly sink.

[0028] During the slow sinking process of the double - wall steel cofferdam, affected by water flow, waves, and self - weight, it is necessary to assist the sinking with the positioning, guiding, and fine - adjustment device in this embodiment. That is, use the internal guiding unit 8, the middle positioning unit 9, and the upper fine - adjustment unit 10 for precise positioning and sinking, as Figure 1 shown. Until the double - wall steel cofferdam 4 sinks to the design elevation and the double - wall steel cofferdam 4 is leveled. A total of eight groups of internal guiding units 8 are provided, and two groups are distributed on each side wall of the double - wall steel cofferdam 4. Its structure is as Figure 2 shown, consisting of a wedge - shaped block 81, connecting support steel sections, and a guiding steel plate 82, corresponding to the position of the steel casing for the pile foundation 6; one end of the connecting support steel section is welded to the inner wall of the double - wall steel cofferdam 4, and the other end is connected to the guiding steel plate 82; the guiding steel plate 82 is processed from Q235 steel plate into an arc - shaped sheet metal part that fits the outer wall of the steel casing, and the inner diameter of the arc is larger than the outer diameter of the steel casing; the bottom of the internal guiding unit is welded with a wedge - shaped block 81 to facilitate the smooth sinking of the cofferdam and make the guiding steel plate 82 smoothly hold against the steel casing for the pile foundation 6.

[0029] The structure of the middle positioning unit 9 is as Figure 3As shown in the figure, it is composed of the first positioning steel casing 91 and the positioning ring 92. There are multiple first positioning steel casings 91, which are evenly arranged on the outer side of the downstream of the double-wall steel cofferdam and constructed together with the drilling platform. The positioning ring 92 is processed from Q235 steel plate, and its inner diameter is larger than the outer diameter of the first positioning steel casing 91. There are two positioning rings, upper and lower, on each first positioning steel casing. The middle positioning unit 9 bears the impact of the water flow force on the double-wall steel cofferdam 4 during the sinking process of the double-wall steel cofferdam 4.

[0030] The structure of the upper fine-tuning unit 10 is as Figure 4 shown in the figure, and it is composed of the second positioning steel casing 104, the outer guide block 102, the jack 101 and the outer guide platform 103. The second positioning steel casing 104 is arranged on both sides of the double-wall steel cofferdam 4 in the direction perpendicular to the water flow and constructed together with the drilling platform. There are a total of six second positioning steel casings 104, with three on each side of the double-wall steel cofferdam 4 in the direction perpendicular to the water flow, and the three second positioning steel casings 104 are evenly distributed. The outer guide platform 103 is fixed on the second positioning steel casing 104. The outer guide platform 103 is a box-shaped structure processed from profiled steel and steel plates, and the jack 101 is placed inside it. The outer guide block 102 is arranged at the end of the jack 101, and the outer guide block 102 contacts the side wall of the double-wall steel cofferdam 4, and the double-wall steel cofferdam 4 is finely adjusted through the jack 101.

Claims

1. A positioning and guiding fine-tuning device for the integral sinking of a double-wall steel cofferdam, characterized in that Comprising: Inner guiding units, multiple groups are provided, corresponding to the positions of the pile foundation steel casing; the inner guiding units are composed of wedge-shaped blocks, connecting support steel profiles, and guiding steel plates. One end of the connecting support steel profile is welded to the inner wall of the double-wall steel cofferdam, and the other end is connected to the guiding steel plate; the guiding steel plate is an arc-shaped sheet metal part that fits the outer wall of the pile foundation steel casing; the wedge-shaped blocks are welded to the bottom of the inner guiding unit to facilitate the smooth sinking of the cofferdam and enable the inner guiding unit to smoothly hold against the pile foundation steel casing. Middle positioning units, composed of a first positioning steel casing and a positioning ring. The first positioning steel casing is arranged on the outer side of the downstream of the double-wall steel cofferdam, and the positioning ring is fixed on the first positioning steel casing. The top end of the positioning ring abuts against the outer side surface of the double-wall steel cofferdam to withstand the impact of the water flow force on the double-wall steel cofferdam during the sinking process of the double-wall steel cofferdam. Upper fine-tuning units, composed of a second positioning steel casing, outer guiding blocks, jacks, and an outer guiding platform. The second positioning steel casing is arranged on both sides of the double-wall steel cofferdam in the direction perpendicular to the water flow; the outer guiding platform is fixed on the second positioning steel casing, and jacks are placed inside it. Outer guiding blocks are arranged at the top ends of the jacks, and the outer guiding blocks are in contact with the side wall of the double-wall steel cofferdam to finely adjust the double-wall steel cofferdam through the jacks.

2. The positioning and guiding fine-tuning device for the integral sinking of the double-wall steel cofferdam according to claim 1, wherein: The guiding steel plate is processed from Q235 steel plate into an arc-shaped sheet metal part that fits the outer wall of the pile foundation steel casing, and the inner diameter of the arc is larger than the outer diameter of the pile foundation steel casing.

3. The positioning and guiding fine-tuning device for the integral sinking of the double-wall steel cofferdam according to claim 1, characterized in that: A total of eight groups of the inner guiding units are provided, and two groups are distributed on each side wall of the double-wall steel cofferdam.

4. The positioning and guiding fine-tuning device for the integral sinking of the double-wall steel cofferdam according to claim 1, characterized in that: The positioning ring is processed from Q235 steel plate, and its inner diameter is larger than the outer diameter of the first positioning steel casing.

5. The positioning and guiding fine-tuning device for the integral sinking of the double-wall steel cofferdam according to claim 1, characterized in that: Multiple first positioning steel casings are provided and are evenly arranged on the outer side of the downstream of the double-wall steel cofferdam.

6. The positioning and guiding fine-tuning device for the integral sinking of the double-wall steel cofferdam according to claim 5, characterized in that: Two positioning rings, upper and lower, are arranged on each first positioning steel casing.

7. The positioning and guiding fine-tuning device for the integral sinking of the double-wall steel cofferdam according to claim 1, wherein: The outer guiding platform is a box-shaped structure processed from steel profiles and steel plates.

8. The positioning and guiding fine-tuning device for the integral sinking of the double-wall steel cofferdam according to claim 1, wherein: A total of six second positioning steel casings are provided, and three are arranged on each side of the double-wall steel cofferdam in the direction perpendicular to the water flow, and the three second positioning steel casings are evenly arranged.

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