CN216973455U - Double-walled steel cofferdam structure without back cover - Google Patents
Double-walled steel cofferdam structure without back cover Download PDFInfo
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- CN216973455U CN216973455U CN202220634862.XU CN202220634862U CN216973455U CN 216973455 U CN216973455 U CN 216973455U CN 202220634862 U CN202220634862 U CN 202220634862U CN 216973455 U CN216973455 U CN 216973455U
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Abstract
The utility model discloses a double-wall steel cofferdam structure without a back cover, which belongs to the technical field of building construction and comprises: the blade foot groove is arranged on the riverbed; the double-wall steel cofferdam comprises a double-wall steel cofferdam, wherein the bottom of the double-wall steel cofferdam is provided with a mounting blade foot, the lower end of the mounting blade foot is in a sharp-horn shape, and the mounting blade foot is fixedly arranged in a blade foot groove through a fixed concrete body; the inner support is connected between the two oppositely arranged double-wall steel cofferdams; the anchoring system operation platform is arranged at the upper end of the double-wall steel cofferdam; the anchoring system comprises an anchoring end, a pre-buried pull rod, an anchoring box and a pre-stressed pull rod. The utility model leads the installation blade foot of the double-wall steel cofferdam to root on the riverbed and ensures the good stability of the double-wall steel cofferdam. During construction, the prestressed pull rod of the anchoring system is tensioned on the anchoring system operation platform, so that the double-wall steel cofferdam is anchored, and the good stability of the double-wall steel cofferdam is further ensured.
Description
Technical Field
The utility model relates to the technical field of building construction, in particular to a double-wall steel cofferdam structure without a back cover.
Background
The double-wall steel cofferdam has the advantages of high structural rigidity, convenience in construction, less process conversion and good water stopping effect, so that the double-wall steel cofferdam is commonly used as a water stopping structure for the deep water foundation of the bridge.
However, in the prior art, when the double-wall steel cofferdam is constructed in the bed bedrock complete area of the bare rock area, the cutting edge of the double-wall steel cofferdam is difficult to root, so that the stability of the double-wall steel cofferdam in the bare rock area of the torrent deepwater is poor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a bottom-sealing-free double-wall steel cofferdam structure, which aims to solve the technical problem that the stability of a double-wall steel cofferdam in a torrent deepwater bare rock area is poor due to the fact that the cutting edge of the double-wall steel cofferdam in the prior art is difficult to root.
As the conception, the technical scheme adopted by the utility model is as follows:
a bottomless double-walled steel cofferdam structure comprising:
the blade groove is arranged on the riverbed;
the double-wall steel cofferdam comprises a double-wall steel cofferdam, wherein the bottom of the double-wall steel cofferdam is provided with a mounting blade foot, the lower end of the mounting blade foot is in a sharp-horn shape, and the mounting blade foot is fixedly arranged in a blade foot groove through a fixed concrete body;
the inner support is connected between the two oppositely arranged double-wall steel cofferdams;
the anchoring system operation platform is arranged at the upper end of the double-wall steel cofferdam;
the anchoring system comprises an anchoring end, a pre-buried pull rod, an anchoring box and a pre-stressed pull rod, wherein the pre-buried pull rod is pre-buried in the riverbed and located on the outer side of the double-wall steel cofferdam, the anchoring end is arranged at the upper end of the pre-buried pull rod, the anchoring box is arranged at the upper end of the double-wall steel cofferdam and located above the anchoring system operation platform, the upper end of the pre-stressed pull rod is connected with the anchoring box, and the lower end of the pre-stressed pull rod is connected with the anchoring end.
Optionally, a pre-buried hole is formed in the riverbed, and the pre-buried pull rod is pre-buried in the pre-buried hole.
Optionally, the outer periphery of the prestressed tension rod is wrapped with an anti-corrosion layer.
Optionally, the double-wall steel cofferdam structure without the sealing bottom further comprises an enclosing purlin, the enclosing purlin is connected between the two oppositely-arranged double-wall steel cofferdams, and the joint of the enclosing purlin and the inner support is of a tensile structure.
Optionally, a support plate is further arranged between the inner support and the double-wall steel cofferdam, and the support plate is located on the lower side of the purlin.
Optionally, the inner support comprises a plurality of columns, and two adjacent columns are connected through a flange connection plate.
Optionally, two ends of the prestressed pull rod are respectively hinged to the anchoring end and the anchoring box.
Optionally, the pre-stressed tie-rod is a rigid tie-rod.
Optionally, a connecting portion is arranged on the side of the upper end of the double-wall steel cofferdam, and the anchor pulling box is arranged on the connecting portion.
Optionally, a jack is arranged on the anchor box, and the prestressed pull rod is connected to the jack.
According to the double-wall steel cofferdam structure without the sealing bottom, the mounting blade feet are arranged at the bottom of the double-wall steel cofferdam, the lower ends of the mounting blade feet are in a sharp-horn shape, the mounting blade feet are placed in the blade foot grooves during construction, concrete is poured into the blade foot grooves to form a fixed concrete body, and therefore the mounting blade feet are fixed in the blade foot grooves, the mounting blade feet of the double-wall steel cofferdam can root on a riverbed, and the good stability of the double-wall steel cofferdam is guaranteed. During construction, the prestressed pull rod of the anchoring system is tensioned on the anchoring system operation platform, so that the double-wall steel cofferdam is anchored, and the good stability of the double-wall steel cofferdam is further ensured.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
Fig. 1 is a schematic elevation view of a bottomless double-wall steel cofferdam structure provided by an embodiment of the utility model after construction is completed;
FIG. 2 is a schematic view of a mounting blade foot in a blade foot groove provided by an embodiment of the present invention;
FIG. 3 is an enlarged schematic view of the anchoring end of FIG. 1;
FIG. 4 is an enlarged schematic view of the tension end of FIG. 1;
FIG. 5 is an enlarged schematic view of the connection of FIG. 1;
FIG. 6 is an enlarged schematic view of the anchor box of FIG. 1;
fig. 7 is a top view of the bottom-sealed double-wall steel cofferdam structure according to the embodiment of the present invention.
In the figure:
1. a blade foot groove;
2. a double-wall steel cofferdam; 21. installing a blade leg;
3. an anchoring system; 31. an anchoring end; 32. pre-burying a pull rod; 321. lute button; 322. the lute button is connected with a pin shaft; 33. an anchor pull box; 34. a prestressed tension rod; 341. a tension rod locking nut; 342. tensioning the nut; 35. a connecting portion; 351. a weir body connecting plate; 352. a connecting portion main body; 3521. a stiffening ring; 36. a jack;
4. an inner support; 41. a flange connecting plate; 42. a support plate;
51. a bearing platform; 52. a concrete cushion; 53. an anchoring system work platform.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting of the utility model. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that unless otherwise explicitly stated or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection or a removable connection; 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 meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Referring to fig. 1-7, the present embodiment provides a bottomless double-walled steel cofferdam structure, which comprises a blade groove 1, a double-walled steel cofferdam 2, an inner support 4, an anchoring system operation platform 53 and an anchoring system 3.
Wherein, the blade foot groove 1 is arranged on the riverbed; the bottom of the double-wall steel cofferdam 2 is provided with a mounting blade foot 21, the lower end of the mounting blade foot 21 is in a sharp-horn shape, and the mounting blade foot 21 is fixedly arranged in the blade foot groove 1 through a fixed concrete body; an inner support 4 is connected between the two oppositely arranged double-wall steel cofferdams 2; the anchoring system operation platform 53 is arranged at the upper end of the double-wall steel cofferdam 2; the anchoring system 3 comprises an anchoring end 31, an embedded pull rod 32, an anchoring box 33 and a prestressed pull rod 34, the embedded pull rod 32 is embedded in a riverbed and located on the outer side of the double-wall steel cofferdam 2, the anchoring end 31 is arranged at the upper end of the embedded pull rod 32, the anchoring box 33 is arranged at the upper end of the double-wall steel cofferdam 2 and located above an anchoring system operation platform 53, the upper end of the prestressed pull rod 34 is connected with the anchoring box 33, and the lower end of the prestressed pull rod 34 is connected with the anchoring end 31.
The double-wall steel cofferdam structure without the back cover provided by the embodiment is characterized in that the bottom of the double-wall steel cofferdam 2 is provided with the installation blade leg 21, the lower end of the installation blade leg 21 is in a pointed shape, the installation blade leg 21 is placed in the blade leg groove 1 during construction, concrete is poured into the blade leg groove 1 to form a fixed concrete body, and therefore the installation blade leg 21 is fixed in the blade leg groove 1, the installation blade leg 21 of the double-wall steel cofferdam 2 roots on a riverbed, and the good stability of the double-wall steel cofferdam 2 is ensured. During construction, the prestressed pull rod 34 of the anchoring system 3 is tensioned on the anchoring system operation platform 53, so that the double-wall steel cofferdam 2 is anchored, and the good stability of the double-wall steel cofferdam 2 is further ensured.
Specifically, in this embodiment, a pre-buried hole is provided on the riverbed, and the pre-buried pull rod 32 is pre-buried in the pre-buried hole.
Preferably, the outer periphery of the prestressed tension rod 34 is wrapped with an anti-corrosion layer.
Furthermore, the double-wall steel cofferdam structure without the bottom sealing further comprises an enclosing purlin, the enclosing purlin is connected between the two oppositely-arranged double-wall steel cofferdams 2, and the joint of the enclosing purlin and the inner support 4 is of a tensile structure.
Specifically, in the present embodiment, the inner support 4 includes a plurality of columns, and two adjacent columns are connected by the flange connection plate 41.
Further, in order to ensure the stability of the connection between the inner support 4 and the double-wall steel cofferdam 2, in this embodiment, a support plate 42 is further disposed between the inner support 4 and the double-wall steel cofferdam 2, and the support plate 42 is located on the lower side of the purlin.
Specifically, both ends of the prestressed tension rod 34 are respectively hinged with the anchoring end 31 and the anchoring box 33. The prestressed tie-rods 34 are rigid tie-rods. The side of the upper end of the double-wall steel cofferdam 2 is provided with a connecting part 35, and the anchor pulling box 33 is arranged on the connecting part 35. The anchor box 33 is provided with a jack 36, and the prestressed pull rod 34 is connected to the jack 36.
Referring to fig. 5, in particular, the connection part 35 includes a weir connection plate 351 and a connection part main body 352, the weir connection plate 351 is vertically disposed at one end of the connection part main body 352, and a stiffening plate is disposed between the weir connection plate 351 and the connection part main body 352. The weir body connecting plate 351 is connected to the upper end side of the double-walled steel weir 2, and the anchor box 33 is provided on the connecting portion main body 352 of the connecting portion 35. Specifically, the connecting portion body 352 is provided with a stiffening ring 3521, and the anchor box 33 is connected to the stiffening ring 3521 by a pin.
Further, the anchoring end 31 is fixedly arranged at the upper end of the embedded pull rod 32; specifically, a lute button 321 is arranged at the upper end of the embedded pull rod 32, a lute button connecting pin 322 is arranged on the anchoring end 31, and the lute button 321 is hung on the connecting pin 322. After tensioning is finished, a prestressed pull rod protection device is arranged to ensure the water corrosivity of the prestressed pull rod 34 and avoid adverse effects on the prestressed pull rod 34 caused by collision of river drift.
Referring to fig. 4 and 6, the prestressed tension rods 34 are connected to the jacks 36 by tensioning nuts 342. Specifically, the prestressed tension rod 34 is locked to the anchor case 33 by the tension rod lock nut 341.
Specifically, in a space defined by the double-walled steel cofferdam 2, a concrete cushion 52 is laid on the river bed, and a bearing platform 51 is provided on the concrete cushion 52.
Specifically, when a bottomless double-wall steel cofferdam structure is formed in the construction process, the construction process comprises the following steps:
s1, punching grooves on the riverbed to form edge foot grooves 1, and cleaning the edge foot grooves 1;
s2, processing the bottom of the double-wall steel cofferdam 2 to form a mounting blade foot 21, lowering the double-wall steel cofferdam 2 to be in place by adopting a lowering system, enabling the mounting blade foot 21 to be located in the blade foot groove 1, pouring concrete into the blade foot groove 1 and the mounting blade foot 21 for the first time, and evacuating the lowering system after the concrete degree in the blade foot groove 1 and the mounting blade foot 21 meets the design requirement;
s3, connecting a cofferdam weir body, installing an anchoring system operation platform 53 at the position of an inner support 4 of the cofferdam weir body, installing an anchoring system 3 on the double-wall steel cofferdam 2 to anchor the double-wall steel cofferdam 2, wherein the anchoring system operation platform 53 is a human operation platform during anchoring operation, and tensioning the anchoring system 3.
In step S3, the anchoring system 3 is placed on the double-walled steel cofferdam 2 in a position where horizontal forces can be balanced.
Specifically, in step S3, when the anchoring system operation platform 53 stretches the anchoring system 3, the amount of force required for stretching is determined according to the overall buoyancy of the bottomless double-wall steel cofferdam structure, the angle at which the anchoring system 3 is disposed, the weight of the double-wall steel cofferdam 2, the gravity and the bond strength of the blade-foot anchoring concrete, and the overall safety factor of the reserved structure, which are well known to those skilled in the art and will not be described in detail herein.
In the construction steps, concrete is poured into the blade foot groove 1 and the mounting blade foot 21, so that the mounting blade foot 21 of the double-wall steel cofferdam takes root on the riverbed, and the anchoring system 3 is matched to anchor the double-wall steel cofferdam 2, thereby ensuring the stability of the double-wall steel cofferdam 2.
Referring to fig. 2, preferably, in step S2, after the lowering system is withdrawn after the concrete in the blade foot groove 1 reaches the design requirement, the concrete is poured toward the blade foot groove 1 until the height of the concrete is over the tread of the installation blade foot.
Referring to fig. 2, in the present embodiment, after the anchoring system 3 is installed, concrete is poured on the notch of the blade foot groove 1 to achieve a water-stopping effect.
After the construction is finished, if the concrete in the blade foot groove 1 has water seepage, cement slurry needs to be injected for plugging and strengthening the blade foot.
After the construction of the double-wall steel cofferdam structure without the back cover is finished, the whole cofferdam structure bears the function of integral buoyancy by the bond stress of concrete at the position of the mounting blade foot 21, the tension of the anchoring system 3 and the self weight of the cofferdam. Because the bed rock of the river bed is complete, the possibility of a large amount of water gushing after water pumping in the later period is low. After construction is finished, if the phenomenon of water leakage at the joint cracks of the concrete or the riverbed bedrock in the blade groove 1 is found in the later stage, water stopping materials such as cement slurry and the like are injected for stopping leakage.
Further, before step S1, the following steps are also required:
and S0, judging the integrity of the bedrock by adopting detection equipment to obtain the bottom surface condition of the riverbed in the bare rock area.
Specifically, in step S0, the detection apparatus includes a sonar and an underwater camera. Specifically, before the construction, carry out the scheme design to no back cover double-walled cofferdam structure, adopt sonar and camera machine under water, combine bridge site department ground reconnaissance condition to judge the integrality of basement rock, combine sonar system and camera machine under water to form bare rock area river bed surface topography condition.
Specifically, in step S1, grooving is performed using a hammer drill or underwater blasting to form the leg groove 1. Specifically, in step S1, the installation position of the installation blade leg 21 is subjected to notching based on the topographic data at the construction site.
Referring to fig. 3, further, before step S3, the following operations are performed:
drilling holes at predetermined positions to form pre-buried holes of the anchoring end 31 of the anchoring system 3; specifically, a geological drill is used for drilling the anchoring end 31 at a preset position, and the pre-buried holes are used for installing the pre-buried pull rods 32 of the anchoring end 31. Further, the depth of the pre-buried hole is determined by the buoyancy of the double-wall steel cofferdam 2 and the integrity of bedrock.
Preferably, before construction, in order to verify the mechanical properties of the anchoring end 31, a pull test should be performed.
Preferably, step S3 includes: the prestressed pull rods 34 are uniformly and symmetrically tensioned in stages at the anchor pull box 33. Specifically, the anchor draw box 33 is a tension end, and the prestress draw rods 34 are uniformly and symmetrically tensioned at the tension end in a grading manner.
In step S3, the prestressed tension rod 34 needs to be subjected to an anti-corrosion treatment; in the double-wall steel cofferdam structure without the back cover, the prestressed pull rod 34 is a main component of an anti-floating measure, so that the prestressed pull rod 34 needs to be protected immediately after construction is finished, and external anti-corrosion treatment and protection are well performed. If the river has more floating objects, the protection measures should be strengthened. Specifically, the prestress of the prestressed tension rod 34 is applied according to the magnitude of the buoyancy, and the anti-floating requirement is satisfied.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but rather is susceptible to various changes and modifications without departing from the spirit and scope of the utility model, which changes and modifications are within the scope of the utility model as claimed. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (10)
1. A bottomless double-walled steel cofferdam structure, comprising:
the blade foot groove (1) is formed in the riverbed;
the double-wall steel cofferdam comprises a double-wall steel cofferdam (2), wherein the bottom of the double-wall steel cofferdam (2) is provided with a mounting blade foot (21), the lower end of the mounting blade foot (21) is in a sharp-angle shape, and the mounting blade foot (21) is fixedly arranged in a blade foot groove (1) through a fixed concrete body;
the inner support (4) is connected between the two double-wall steel cofferdams (2) which are oppositely arranged;
the anchoring system operation platform (53) is arranged at the upper end of the double-wall steel cofferdam (2);
anchoring system (3), including anchor end (31), pre-buried pull rod (32), anchor case (33) and prestressing force pull rod (34), pre-buried pull rod (32) pre-buried in the riverbed just is located the outside of double-walled steel cofferdam (2), anchor end (31) are located pre-buried pull rod (32) upper end, anchor case (33) set up in the upper end of double-walled steel cofferdam (2) just is located the top of anchoring system work platform (53), the upper end of prestressing force pull rod (34) with anchor case (33) are connected, the lower extreme of prestressing force pull rod (34) with anchor end (31) are connected.
2. The double-walled steel cofferdam structure without back cover of claim 1, characterized in that said riverbed is provided with pre-embedded holes, said pre-embedded tie rods (32) being pre-embedded in said pre-embedded holes.
3. The bottomless double-walled steel cofferdam structure of claim 1, wherein the outer perimeter of the prestressed tension-rods (34) is wrapped with an anti-corrosion layer.
4. The bottomless double-wall steel cofferdam structure of claim 1, wherein the bottomless double-wall steel cofferdam structure further comprises an enclosing purlin, the enclosing purlin is connected between the two oppositely arranged double-wall steel cofferdams (2), and the joint of the enclosing purlin and the inner support (4) is of a tensile structure.
5. The bottomless double-wall steel cofferdam structure of claim 4, characterized in that a support plate (42) is further arranged between the inner support (4) and the double-wall steel cofferdam (2), the support plate (42) being located at the lower side of the purlin.
6. The bottomless double-walled steel cofferdam structure according to claim 1, characterized in that the inner support (4) comprises a plurality of columns, two adjacent columns being connected by a flange connection disc (41).
7. The bottomless double-walled steel cofferdam structure according to claim 1, characterized in that both ends of the pre-stressed tie-rods (34) are hinged with the anchoring end (31) and the anchoring box (33), respectively.
8. The bottomless double-walled steel cofferdam structure according to claim 1, characterized in that the pre-stressed tie-rods (34) are rigid tie-rods.
9. Bottom-closure-free double-walled steel cofferdam structure according to any of the claims 1-8, characterized in that the upper end side of the double-walled steel cofferdam (2) is provided with a connection part (35), and the anchor boxes (33) are provided on said connection part (35).
10. Bottom-closure-free double-walled steel cofferdam structure according to any of the claims 1-8, characterized in that said anchor boxes (33) are provided with jacks (36), said pre-stressed tie-rods (34) being connected to said jacks (36).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220634862.XU CN216973455U (en) | 2022-03-22 | 2022-03-22 | Double-walled steel cofferdam structure without back cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220634862.XU CN216973455U (en) | 2022-03-22 | 2022-03-22 | Double-walled steel cofferdam structure without back cover |
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| Publication Number | Publication Date |
|---|---|
| CN216973455U true CN216973455U (en) | 2022-07-15 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202220634862.XU Active CN216973455U (en) | 2022-03-22 | 2022-03-22 | Double-walled steel cofferdam structure without back cover |
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| CN (1) | CN216973455U (en) |
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Effective date of registration: 20230420 Address after: Room 216, No. 7, Wuxing Road, Lucheng Town, Tongzhou District, Beijing 100027 Patentee after: ROAD & BRIDGE INTERNATIONAL Co.,Ltd. Patentee after: ROAD AND BRIDGE EAST CHINA ENGINEERING Co.,Ltd. Patentee after: Hunan Expressway Construction Engineering Co.,Ltd. Address before: Room 216, No. 7, Wuxing Road, Lucheng Town, Tongzhou District, Beijing 100027 Patentee before: ROAD & BRIDGE INTERNATIONAL Co.,Ltd. Patentee before: ROAD AND BRIDGE EAST CHINA ENGINEERING Co.,Ltd. |