CN216787173U - Cofferdam guide structure - Google Patents

Abstract

The application relates to the technical field of bridge engineering, in particular to a cofferdam guide structure. This cofferdam structure includes: the extension section is arranged at the top of a constructed target inclined inserting pile of the bridge and extends upwards to be higher than a riverbed line; the guide device is arranged on the extension section and connected with the extension section; and the cofferdam is arranged along the guide device, and the inner wall of the cofferdam surrounds the target oblique inserting pile. In the scheme of the utility model, the pile foundation of the bridge, namely the batter pile, is constructed in advance, and the batter pile is used as the guide pile for cofferdam construction, so that the construction step of a temporary guide pile is omitted, and the construction period and the cost investment are greatly reduced. The guide device in the scheme can be used for dismantling and recycling, so that the cost is saved. The steel quantity of the guide structure used in the scheme is small, the construction investment is reduced, and the construction cost is reduced.

Description

Cofferdam guide structure

Technical Field

The application relates to the technical field of bridge engineering, in particular to cofferdam guide structure.

Background

With the domestic development, the bridge construction technology is continuously improved. The bridge can be divided into a high pile cap and a buried cap (also called a low pile cap) according to the relative position of the cap and the riverbed. The low-pile bearing platform pile foundation can be divided into a straight pile and an inclined pile according to the structural form, the pile foundation is generally arranged under water, and the pile foundation is difficult to construct under the action of horizontal loads such as large water flow, waves, earthquakes and the like. In order to reduce the scale of bridge foundation engineering, the pile foundation usually adopts driven inclined piles or the combination of inclined piles and straight piles, and if the bearing platform is buried below the river bed surface, the pile foundation is just below the water surface. And because the pile foundation need face the impact of rivers when the bridge construction, the impact of the rivers that can better reply of batter pile, so batter pile foundation uses comparatively commonly.

In the existing underwater foundation construction technology. The bridge construction steps generally include cofferdam construction and inclined pile construction. The cofferdam construction generally comprises two types, wherein the first type is that temporary guide piles are arranged on the outer periphery of the cofferdam, and the construction amount of the temporary guide pile structure is huge in order to ensure the horizontal rigidity of the guide piles; the second is to arrange an anchoring and positioning system in the cofferdam, but in actual construction, the mooring ropes arranged in multiple directions in the method can influence the standing position of a construction ship, and the construction organization difficulty is high and the construction risk is high.

SUMMERY OF THE UTILITY MODEL

The embodiment of the application provides a cofferdam guide structure and a construction method thereof, and aims to solve the problems that in the related art, the cofferdam guide structure needs to be re-inserted with guide piles, so that the construction process is complex and the cost is increased.

In a first aspect, a method for constructing a cofferdam guide structure is provided, which comprises the following steps:

constructing a lengthening section at the top of a constructed target inclined pile;

installing a guide device on the extension section;

lowering the inner wall of the cofferdam along the guide device until reaching a designated position;

and pouring bottom sealing concrete until the concrete reaches the design strength, and dismantling the guide device to complete the construction of the cofferdam.

In some embodiments, said lowering the inner wall of the cofferdam along said guides until reaching a designated position comprises:

lowering the inner wall of the cofferdam down along the guide truss of the guide device;

and adjusting the posture of the cofferdam by using a guide adjusting device on the guide truss so as to lower the cofferdam wall to a specified position.

In some embodiments, the installing a guide device on the extension section comprises:

and sleeving the steel pipe fixed on the guide truss on the extension section.

In some embodiments, the guiding and adjusting device is a telescopic rod, and the posture of the cofferdam is adjusted by adjusting the length of the telescopic rod.

In some embodiments, before said removing said guiding device, further comprising:

and pumping water in the cofferdam.

In a second aspect, a cofferdam guide structure comprises:

the extension section is used for being arranged at the top of a target inclined inserting pile constructed on the bridge, and the extension section extends upwards to be higher than a riverbed line;

and the guiding device is arranged on the extension section and used for guiding and adjusting the posture when the cofferdam is placed down.

In some embodiments, the guide device comprises:

a guide truss;

and the steel pipe is connected with the guide truss, and the steel pipe is sleeved on the extension section.

In some embodiments, the guide device further comprises:

and the guiding adjusting device is arranged on one side of the guiding truss, which is far away from the steel pipe, and can be used for stretching between the guiding truss and the cofferdam.

In some embodiments, the guiding adjustment device comprises a screw thread and a jack, and the screw thread can be used for controlling the jack to extend and retract.

In some embodiments, two of the adjusting devices are provided on the guide truss.

The beneficial effect that technical scheme that this application provided brought includes:

(1) in the scheme of the utility model, the pile foundation of the bridge, namely the batter pile, is constructed in advance, and the batter pile is used as the guide pile for cofferdam construction, so that the construction step of a temporary guide pile is omitted, and the construction period and the cost investment are greatly reduced.

(2) The guide device in the scheme of the utility model can be detached for reuse after being used, so that the cost is saved.

(3) The steel used for the guide structure in the scheme of the utility model has small quantity, reduces the construction investment and lowers the construction cost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a flowchart of a construction method of a cofferdam guide structure provided in an embodiment of the present application;

FIG. 2 is a sectional view of a cofferdam guide structure provided by an embodiment of the present application;

FIG. 3 is a cross-sectional view taken from the perspective A-A of FIG. 2 according to an embodiment of the present application;

fig. 4 is a top view of a cofferdam guiding structure provided in the embodiment of the present application;

fig. 5 is a schematic view of a guide device according to an embodiment of the present disclosure.

In the figure: 1. obliquely inserting a target pile; 102. a lengthening section; 2. a guide device; 201. a guide truss; 202. a steel pipe; 203. a guide adjusting device; 3. coffering; 5. a first connection system; 6. a second connection system; 7. and sealing bottom concrete.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The application provides a construction method of a cofferdam guide structure, which aims to solve the problem that the construction of a cofferdam in the related technology needs to be performed with the complicated construction of temporary positioning guide piles in advance and the like. Which comprises the following steps:

s1, constructing an extension section 102 on the top of a target inclined pile 1 of a constructed bridge.

It is worth mentioning that the target oblique insertion pile 1 is not used only as a guide pile here, as shown in fig. 4 and 5. But foundation piles necessary for bridge construction. And the target inclined pile 1 which accords with the preset position is specifically determined according to the cofferdam adjustment condition. Generally speaking, the adjustment of the plane position in four directions is enough, the number of the guide piles arranged in a single direction can be one or more, and the adjustment is specifically judged according to the size of the cofferdam.

Preferably, the extension 102 should be above the bed line of the river.

Specifically, the extension section 102 may be made of a round steel pipe, and the round steel pipe is continuously extended upward along the direction of the target oblique pile 1.

It can be understood that the target oblique insertion piles 1 in the scheme refer to that the target oblique insertion piles 1 meeting the position and stress requirements are selected from bridge bottom oblique insertion piles necessary for bridge construction to serve as temporary guide piles for construction. But after the cofferdam construction is finished, the guide device 2 and the extension section 102 can be removed, so that the target inclined pile 1 can be continuously used as a pile foundation for bridge construction.

S2, installing a guide device 2 on the extension section 102.

In some embodiments, a guiding device 2 is installed on the extension section 102, and the guiding device 2 includes a plurality of guiding trusses 201 and a steel pipe 202 connected to the guiding trusses 201, and the steel pipe 202 is sleeved on the extension section 102.

Specifically, as shown in fig. 2 and 3, the step S2 further includes connecting the guiding girders 201 of each extension segment 102 together through the first connection system 5, so as to prevent the guiding girders from rotating; the steel pipes 202 on each extension 102 are connected together by section steel. The first connection system 5 generally employs steel pipes and section steels. And the multiple groups of guide trusses 201 are connected into a whole through the second connecting system 6, so that the stress requirement is met. The number of the guide trusses 201 is matched with the number of the target oblique piles 1 corresponding to the preset positions.

It can be understood that the guiding truss 201 includes an upper layer, a middle layer and a lower layer, each layer of the guiding truss 201 is parallel to the horizontal plane, and the upper layer, the middle layer and the lower layer of the guiding truss 201 are respectively connected and fixed with the upper part, the middle part and the lower part of the steel pipe 202. Each guiding truss 201 is provided with two guiding adjusting devices 4, wherein one guiding adjusting device 4 is coplanar with the upper layer of the guiding truss 201, and the other guiding adjusting device 4 is coplanar with the lower layer of the guiding truss 201. The guiding and adjusting device 4 is arranged on the outer side of the guiding truss 201 (i.e. the side close to the subsequent construction cofferdam 3).

It should be noted that the inner diameter of the steel pipe 202 is slightly larger than the outer diameter of the elongated section 102, and the difference between the two is generally 2 cm.

And S3, lowering the inner wall of the cofferdam 3 along the guide device 2 until the inner wall reaches a specified position.

Specifically, step S3 above further includes providing a guiding adjustment device 4 on a side of the guiding truss 201 away from the steel pipe 202, where the guiding adjustment device is used to extend and contract between the guiding truss 201 and the cofferdam 3; in the process of lowering the cofferdam 3, the lowering posture of the cofferdam is adjusted by the telescopic adjustment of the guiding and adjusting device 4, so that the cofferdam 3 is precisely lowered to a specified position. And the water can be over-irrigated by 1cm in the lowering process.

Preferably, the designated position of weir 3 generally means that the top surface of weir 3 should not be below the high tide level of the water surface after lowering to the designated level position.

It will be appreciated that cofferdam 3 may be of a double-walled construction, which is typically used in situations where water depths are high, current velocities are high or wave loads are high.

Certainly, the cofferdam 3 can adopt a single-wall structure, the construction process of the cofferdam with the single-wall structure is similar to that of the cofferdam with the double-wall structure, and the construction difficulty is small.

And S4, pouring bottom sealing concrete 7 until the concrete reaches the design strength, and dismantling the guide device 2 to complete the construction of the cofferdam 3.

Preferably, before the guide device 2 is removed, water in the cofferdam 3 is pumped away, so that the subsequent construction is more convenient.

In a second aspect, there is provided a cofferdam guiding structure, comprising:

the extension section 102 is arranged at the top of the target inclined pile inserting 1, and the extension section 102 extends upwards to be higher than the riverbed line; the guiding device 2 comprises a plurality of guiding trusses 201 and steel pipes 202, the steel pipes 202 are sleeved on the extension sections 102, and the guiding trusses 201 are connected with the steel pipes 202; and a cofferdam 3 disposed along one side of the guide truss 201 away from the steel pipe 202, the cofferdam 3 surrounding the target slant insertion pile 1.

Preferably, the guide truss 201 includes an upper layer, a middle layer and a lower layer, each layer of the guide truss 201 is parallel to the horizontal plane, and the upper layer, the middle layer and the lower layer of the guide truss 201 are respectively connected and fixed with the upper part, the middle part and the lower part of the steel pipe 202.

Specifically, the guiding adjustment device 203 is arranged on the side of the guiding truss 201 far away from the steel pipe 202, and the guiding adjustment device 4 can be used for extending and contracting between the guiding truss 201 and the cofferdam 3.

Preferably, the guiding adjustment device 203 comprises a screw thread and a jack, and the screw thread can be used for controlling the telescopic action of the jack.

It can be understood that the guiding and adjusting device 203 is a telescopic rod, and the posture of the cofferdam 3 can be adjusted by adjusting the length of the telescopic rod.

Correspondingly, each guiding truss 201 is provided with two guiding adjusting devices 4, the guiding adjusting devices 4 are used for adjusting the position of the cofferdam 3, one guiding adjusting device 4 is coplanar with the upper layer of the guiding truss 201, and the other guiding adjusting device 4 is coplanar with the lower layer of the guiding truss 201.

Preferably, after cofferdam 3 is lowered into position, the upper guiding adjustment means 4 is preferably substantially aligned with the low tide line in the river. Preferably, the lower guiding adjustment means 4 should be above the riverbed line.

In some embodiments, as shown in fig. 3 and 4, the target oblique insertion pile 1 includes 4 steel oblique piles symmetrically arranged with the cofferdam 3 as a center.

It is understood that the target slant insertion pile 1 may include 6, 8 or 10 slant insertion piles symmetrically arranged about the cofferdam 3. In general, the oblique piles near the cofferdam 3, that is, piles at the periphery of the cap, are selected as the target oblique piles, so that the guiding rigidity is stronger. Cofferdam 3 can receive the effect of rivers in the work progress, and the overall structure of cofferdam 3 can be askew from east to west, therefore we need adjust cofferdam 3, and the adjustment of plane position only need be just enough to the adjustment of four directions, sets up guider number on the single direction, can be one also can be a plurality of, and this should be decided according to the concrete size of cofferdam.

In conclusion, the scheme of the utility model utilizes the pile foundation of the bridge which is constructed in advance, namely the inclined insertion pile, and utilizes the inclined insertion pile which is constructed in advance as the guide pile to carry out cofferdam construction, thereby omitting the construction step of the temporary guide pile and greatly reducing the construction period and the cost input. The guide device in the scheme of the utility model can be detached for reuse after being used, so that the cost is saved. The steel used for the guide structure in the scheme of the utility model has small quantity, reduces the construction investment and lowers the construction cost. On the other hand, this scheme adopts direction truss 201 and direction adjusting device 203 matched with structure to assist transferring of cofferdam 3 on guider 2, provides convenience for cofferdam 3 construction.

In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

It is noted that, in this application, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (10)

1. A cofferdam guide structure, comprising:

the extension section (102) is arranged at the top of a target inclined inserting pile (1) of which the bridge is constructed, and the extension section (102) extends upwards to be higher than a riverbed line;

a guide (2) arranged on the extension (102).

2. Cofferdam guiding structure according to claim 1, characterized in that said guiding means (2) comprise:

a guide truss (201);

and the steel pipe (202) is connected with the guide truss (201), and the steel pipe (202) is sleeved on the extension section (102).

3. A cofferdam guide structure according to claim 2, characterized in that:

each guide truss (201) is connected together through a first connecting system (5);

the steel pipes (202) on each extension section (102) are connected with each other through section steel.

4. Cofferdam guiding structure according to claim 2, characterized in that said guiding means (2) further comprise:

and the guiding adjusting device (203) is arranged on one side, away from the steel pipe (202), of the guiding truss (201), and the guiding adjusting device (203) can be used for stretching and contracting between the guiding truss (201) and the cofferdam (3).

5. A cofferdam guide structure according to claim 4, characterized in that:

the guide truss (201) is provided with 2 guide adjusting devices (203).

6. A cofferdam guide structure according to claim 4, characterized in that:

the guiding and adjusting device (203) comprises a screw thread and a jack, and the screw thread can be used for controlling the telescopic action of the jack.

7. A cofferdam guide structure according to claim 1, characterized in that:

the target inclined pile (1) comprises 4 steel inclined piles symmetrically arranged in the cofferdam (3).

8. A cofferdam guide structure according to claim 1, characterized in that:

the target inclined pile (1) comprises 6 steel inclined piles symmetrically arranged in the cofferdam (3).

9. A cofferdam guide structure according to claim 1, characterized in that:

the target inclined pile (1) comprises 8 steel inclined piles symmetrically arranged in the cofferdam (3).

10. A cofferdam guide structure according to claim 1, characterized in that:

the target inclined pile (1) comprises 10 steel inclined piles symmetrically arranged in the cofferdam (3).

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