CN107217680B - Device for reducing thickness of bottom sealing concrete of steel suspension box cofferdam and construction method - Google Patents
Device for reducing thickness of bottom sealing concrete of steel suspension box cofferdam and construction method Download PDFInfo
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- CN107217680B CN107217680B CN201710344064.7A CN201710344064A CN107217680B CN 107217680 B CN107217680 B CN 107217680B CN 201710344064 A CN201710344064 A CN 201710344064A CN 107217680 B CN107217680 B CN 107217680B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/02—Restraining of open water
- E02D19/04—Restraining of open water by coffer-dams, e.g. made of sheet piles
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
Abstract
The invention discloses a device for reducing the thickness of bottom sealing concrete of a steel suspension box cofferdam, which comprises the steel suspension box cofferdam and a steel casing, and also comprises: the sleeve is a hollow cylinder coaxial with the bottom hole of the steel suspension box cofferdam, the outer wall of the sleeve is welded to the inner wall of the bottom hole of the steel suspension box cofferdam, the upper end and the lower end of the sleeve protrude out of the bottom plate of the steel suspension box cofferdam, and the inner diameter of the sleeve is larger than the outer diameter of the steel casing; the collet is of an annular structure, the inner diameter of the collet is set to enable the collet to be attached to the outer wall of the steel casing and can slide up and down, and the outer diameter of the collet is set to be larger than that of the sleeve; a hanging wire rope, the lower end of which hangs the bottom support; the invention also discloses a construction method by using the device. The invention can effectively reduce the thickness of the bottom sealing concrete, and has simple structure and convenient operation.
Description
Technical Field
The invention relates to a construction technology of steel suspension box cofferdam bottom sealing concrete. More particularly, the invention relates to a device for reducing the thickness of the bottom sealing concrete of a steel suspension box cofferdam and a construction method thereof.
Background
The steel suspension box cofferdam is mainly used for construction of high-rise pile bearing platforms in rivers, lakes and seas, and has the main function of preventing water from entering a bearing platform operation area and providing a dry operation environment for bearing platform construction. The main construction process comprises the following steps: 1. lowering the steel hanging box in place and positioning; 2. pouring underwater bottom sealing concrete; 3. pumping water; 4. and (5) constructing a bearing platform. The functions of the bottom sealing concrete are mainly two points: 1. water is retained, and water is prevented from flowing into the bearing platform operation area from the lower surface of the bottom plate; 2. the platform support is provided for the bearing platform construction, and the bearing platform supports the floating force generated by the water head difference after water pumping and the load during the bearing platform pouring.
To achieve both functions, the bottom-cover concrete must have a certain thickness to provide sufficient rigidity and bond strength (adhesion between the bottom-cover concrete and the steel casing). In actual engineering, the thickness of the bottom sealing concrete is usually controlled by the bond strength, the rigidity of the concrete has certain margin, and the construction is wasted.
In order to solve the problems, a device is added to improve the bond stress while the thickness of the bottom sealing concrete is reduced, so that the construction requirements are met.
Disclosure of Invention
An object of the present invention is to solve at least the above problems and to provide at least the advantages described later.
It is still another object of the present invention to provide an apparatus for effectively reducing the thickness of the closed-bottom concrete of a steel suspension box cofferdam and a construction method using the same, which can improve the adhesive force of the closed-bottom concrete by increasing the contact area, thereby reducing the thickness of the poured closed-bottom concrete.
To achieve these objects and other advantages and in accordance with the purpose of the invention, there is provided an apparatus for reducing the thickness of concrete at the bottom of a steel drop box cofferdam, comprising: steel overhead bin cofferdam, steel protect a section of thick bamboo, its characterized in that still includes: the sleeve is a hollow cylinder coaxial with the bottom hole of the steel suspension box cofferdam, the outer wall of the sleeve is welded to the inner wall of the bottom hole of the steel suspension box cofferdam, the upper end and the lower end of the sleeve protrude out of the bottom plate of the steel suspension box cofferdam, and the inner diameter of the sleeve is larger than the outer diameter of the steel casing; the collet is of an annular structure, the inner diameter of the collet is set to enable the collet to be attached to the outer wall of the steel casing and can slide up and down, and the outer diameter of the collet is set to be larger than that of the sleeve; and the lower end of the hanging steel wire rope is hung on the bottom support.
Preferably, the upper end of the sleeve is 0.3-0.7 m higher than the upper surface of the cofferdam bottom plate of the steel suspension box, the bottom end of the sleeve is 1.0-1.5 m lower than the upper surface of the cofferdam bottom plate of the steel suspension box, and the distance between the inner diameter of the sleeve and the outer diameter of the steel casing is 0.15-0.35 m.
Preferably, the method further comprises the following steps: the inclined strut is fixedly connected with the sleeve and the steel suspension box cofferdam bottom plate, and circles are uniformly arranged on the upper surface and the lower surface of the steel suspension box cofferdam bottom plate in an encircling manner.
Preferably, a plurality of rib plates are uniformly and annularly arranged on the lower surface of the collet, the rib plates are integrally formed by an upper rectangular plate and a lower right-angle trapezoidal plate, the upper end of the upper rectangular plate is fixed on the lower surface of the collet, the distance between the inner end and the outer end of the upper rectangular plate of the rib plates is the same as the width of the collet, the lower end of the upper rectangular plate is matched with the long bottom edge of the lower right-angle trapezoidal plate, and the oblique waist edge of the lower right-angle trapezoidal plate faces the outer side of the collet; wherein the distance between two adjacent rib plates is less than 0.3m, and the distance between the hanging points at the lower end of the hanging steel wire rope is not more than 1.5 m.
Preferably, the collet is also provided with I-shaped steel, the upper end and the lower end of the I-shaped steel are both of annular structures concentric with the collet, and the upper end of the I-shaped steel is fixed in the middle of the lower surface of the collet; wherein the distance between the hanging points at the lower end of the hanging steel wire rope is not more than 3 m.
Preferably, the upper surface of the bottom support is further provided with a downward annular first groove, and the first groove can be just clamped with the bottom end of the sleeve; the outer side wall of the bottom end of the sleeve is also provided with an upward annular second groove, and the second groove can be just clamped with the outer wall of the first groove.
Preferably, the first groove and the second groove are both made of magnetic blocks, and the magnetism of the first groove and the magnetism of the second groove are opposite, so that the first groove and the second groove are mutually attracted.
Preferably, the upper surface of the bottom support is also provided with a flexible water stop strip.
The invention also provides a construction method by using the device for reducing the thickness of the bottom sealing concrete of the steel suspension box cofferdam, which is characterized by comprising the following steps:
step 1), lowering a steel casing to a set position, and constructing drilled piles in the steel casing until all the drilled piles are constructed;
step 2) welding a rib plate or I-shaped steel on the lower surface of the bottom support, fixing the bottom end of a hanging steel wire rope on the bottom support, then hanging the bottom support by the hanging steel wire rope, sliding the bottom support to the lower part from the upper end of the steel protection cylinder along the outer wall of the steel protection cylinder, and enabling the upper end of the hanging steel wire rope to penetrate through an ear plate hole formed in the outer wall of the upper end of the steel protection cylinder and be hung on the steel protection cylinder; before the bottom sealing concrete is poured, after vertical pretightening force is applied to the upper end of the hanging steel wire rope and the hanging steel wire rope is fixed, the bottom support can be in seamless fit with the sleeve when the bottom sealing concrete is poured;
step 3) assembling the steel suspension box cofferdam by depending on the steel protecting cylinders, welding sleeves on the inner wall of bottom holes of the steel suspension box cofferdam, and welding inclined struts on the upper surface and the lower surface of a bottom plate of the steel suspension box cofferdam;
step 4), after the whole structure is assembled and welded, the steel suspension box cofferdam is put in place and positioned by using putting equipment;
before pouring bottom sealing concrete, lifting a hanging steel wire rope at the top opening of the steel casing until the bottom support is tightly attached to the sleeve, and then locking the hanging steel wire rope;
step 6), pouring bottom sealing concrete of the steel hanging box cofferdam underwater to enable the bottom sealing concrete to be combined with the steel hanging box cofferdam, the steel pile casing, the sleeve and the bottom support into a whole;
and 7) after the strength of the bottom sealing concrete reaches the design requirement, pumping water in the steel suspension box cofferdam, cutting the suspension steel wire rope and the steel casing on the upper part of the bottom sealing concrete, and carrying out bearing platform construction.
Preferably, the step 2) further comprises: welding a first groove on the upper surface of the bottom support; the step 3) further comprises the following steps: welding a second groove on the outer side wall of the lower end of the sleeve; the step 5) further comprises the following steps: when the steel casing top opening is used for lifting and hanging the steel wire rope, the first groove is clamped with the bottom end of the sleeve, and the second groove is clamped with the outer wall of the first groove.
The invention at least comprises the following beneficial effects:
1. the device of the invention has simple structure and strong operability.
2. The sleeve increases the contact area between the steel casing and the bottom sealing concrete, thereby effectively improving the bond stress between the bottom sealing concrete and the steel casing and reducing the construction cost by reducing the thickness of the bottom sealing concrete.
3. The sleeve is welded on the inner wall of the bottom hole of the steel suspension box cofferdam before entering water, and the construction can be carried out by directly entering the water without improving the steel casing.
4. According to the invention, the bottom support provides vertical pretightening force through the tensioning of the hanging steel wire rope, so that the bottom end of the sleeve is sealed, the leakage of bottom sealing concrete is prevented, a baffle is not required to be arranged for sealing a gap between the bottom hole of the steel hanging box cofferdam and the steel protection cylinder, and the hanging steel wire rope is used for tensioning and fixing, so that the structure is simple and convenient.
5. The rib plate or the I-shaped steel is fixed on the lower surface of the bottom support, so that the rigidity of the bottom support can be increased, and the bottom support is suitable for load brought by bottom sealing concrete or construction under severe conditions.
6. The arrangement of the first groove and the second groove can further enhance the direct sealing of the bottom support and the sleeve, the arrangement is that the bottom support and the sleeve are both made of magnetic blocks, the magnetic blocks are opposite in magnetism, better sealing can be achieved, meanwhile, due to the fact that the magnetic blocks are opposite in magnetism and mutually attract, certain upward attraction is achieved, and vertical pre-tightening force required to be applied by the hanging steel wire rope can be reduced to a certain degree.
7. The upper surface of the bottom support is also provided with the flexible water stop strip, so that the sealing can be further enhanced, and the sealing quality is directly related to the pouring quality of the bottom sealing concrete and the success or failure of the whole scheme.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention.
Drawings
FIG. 1 is a front view of the present invention;
fig. 2 is a top view of the present invention.
Detailed Description
The present invention is further described in detail below with reference to the attached drawings so that those skilled in the art can implement the invention by referring to the description text.
It should be noted that in the description of the present invention, the terms "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate orientations or positional relationships based on those shown in the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the device or element 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.
As shown in fig. 1 and 2, the present invention provides a device for reducing the thickness of concrete at the bottom of a steel suspension box cofferdam, comprising: steel overhead bin cofferdam 5, steel protect a section of thick bamboo 1, its characterized in that still includes: the sleeve 3 is a hollow cylinder coaxial with the bottom hole of the steel suspension box cofferdam 5, the outer wall of the sleeve 3 is welded to the inner wall of the bottom hole of the steel suspension box cofferdam 5, the upper end and the lower end of the sleeve 3 protrude out of the bottom plate of the steel suspension box cofferdam 5, and the inner diameter of the sleeve 3 is larger than the outer diameter of the steel casing 1; the collet 6 is of an annular structure, the inner diameter of the collet 6 is set to enable the collet 6 to be attached to the outer wall of the steel casing 1 and to slide up and down, and the outer diameter of the collet is set to be larger than that of the sleeve 3; and the lower end of the hanging steel wire rope 2 is hung on the bottom support 6. In the technical scheme, the sleeve is directly welded on the inner wall of a bottom hole of the steel suspension box cofferdam, the unit area adhesive force between the bottom sealing concrete and the steel protecting cylinder is a fixed value, the total adhesive force is increased, the contact area can only be increased, the diameter of the protecting cylinder is determined, so that the contact height between the bottom sealing concrete and the steel protecting cylinder can only be increased, the lower end of the sleeve protrudes out of the bottom hole of the steel suspension box cofferdam by a certain height, the contact area of the bottom sealing concrete can be increased by the sleeve at the lower end, the adhesive force of the bottom sealing concrete is increased, the thickness of the bottom sealing concrete is reduced, the bottom sealing concrete on the bottom plate has a certain thickness, the bottom sealing concrete has the adhesive force except the adhesive force (preventing the whole body from floating upwards during the construction of the pumping cofferdam), the bottom sealing concrete slab has certain rigidity, otherwise, the concrete is crushed due to the pressure generated by a water head during the pumping, water can enter the cofferdam, the function of the cofferdam is invalid, and therefore the sleeve at the upper end does not need to be too high; thereby the collet prevents the seepage of bottom sealing concrete through hanging the bottom that the tight sealed section of thick bamboo that protects of wire rope, and the outer wall of a section of thick bamboo is protected to the internal diameter laminating steel of collet, and can follow the outer wall and slide from top to bottom, both can transfer the collet smoothly and can prevent the seepage of bottom sealing concrete between collet and the steel protect a section of thick bamboo.
In another technical scheme, the upper end of the sleeve 3 is 0.3-0.7 m higher than the upper surface of the bottom plate of the steel suspension box cofferdam 5, the bottom end of the sleeve 3 is 1.0-1.5 m lower than the upper surface of the bottom plate of the steel suspension box cofferdam 5, and the distance between the inner diameter of the sleeve 3 and the outer diameter of the steel casing 1 is 0.15-0.35 m. In the technical scheme, the invention is suitable for the construction of the high-pile bearing platform, namely the bearing platform is suspended in water and cannot be placed below a mud surface, and the existing bearing platform is generally less than 10m away from the water surface; tests prove that the thickness of the bottom sealing concrete can be effectively reduced from 2m-2.5m to 1m-1.5m by reasonably setting the height range of the sleeve; the position of the steel casing provided by the invention is a theoretical position, the steel casing can be inclined during actual construction, and is different from the original position, so that the sleeve is larger than the steel casing to adapt to the deviation, meanwhile, the sleeve and the bottom sealing concrete in the steel casing have certain thickness, and if the thickness is too thin, the bonding effect of the bottom sealing concrete is not ideal, the effect of increasing the bonding force of the bottom sealing concrete is not achieved, and finally, the effect of effectively reducing the thickness of the bottom sealing concrete is not achieved.
In another technical scheme, the method further comprises the following steps: the inclined strut 4 is fixedly connected with the sleeve 3 and the bottom plate of the steel suspension box cofferdam 5, and a circle is uniformly and annularly arranged on the upper surface and the lower surface of the bottom plate of the steel suspension box cofferdam 5. In this kind of technical scheme, telescopic effect is exactly to increase the contact height of back cover concrete and protection bobbin face, improve the adhesion stress of back cover concrete, steel suspension box cofferdam is transferred from the platform and is put in place, go into water, there are effects such as rivers and wave, can let steel suspension box cofferdam sway from side to side at this in-process, there is the striking between steel protection bobbin and the sleeve, if do not support, this steel sheet of sleeve warp very easily and destroys even, also can increase the rigidity of being connected of sleeve and steel suspension box cofferdam bottom plate simultaneously, ensure that the sleeve is not destroyed at the work progress.
In another technical scheme, a plurality of rib plates are uniformly and annularly arranged on the lower surface of the bottom support 6, the rib plates are integrally formed by an upper cuboid plate and a lower right-angle trapezoidal plate, the upper end of the upper cuboid plate is fixed on the lower surface of the bottom support 6, the distance between the inner end and the outer end of the upper cuboid plate of each rib plate is the same as the width of the bottom support 6, the lower end of the upper cuboid plate is matched with the long bottom edge of the lower right-angle trapezoidal plate, and the oblique waist edge of the lower right-angle trapezoidal plate faces to the outer side of the bottom support 6; wherein the distance between two adjacent rib plates is less than 0.3m, and the distance between the hanging points at the lower end of the hanging steel wire rope 2 is not more than 1.5 m. In this kind of technical scheme, the rigidity of collet is also the key, if rigidity is possible not enough to support the load that the back cover concrete brought, just also can't reach sealed effect, consequently set up polylith gusset at the collet lower surface, with the rigidity of enhancement collet, the effect that the thickness that reaches than simple increase collet is good, also can save material simultaneously, therefore, the cost is reduced, the inclined plane setting of gusset is in the outside of collet, there is certain inclination, can reduce the impact force of water to the collet, collet and the thickness of muscle plate is 20mm among this technical scheme, and the cuboid board on gusset upper portion is the same with the width of collet about the both ends, the interval that wire rope hung the hoisting point design also comes the decision according to the gusset that the collet lower part set up.
In another technical scheme, the bottom support 6 is also provided with an I-shaped steel, the upper end and the lower end of the I-shaped steel are both of annular structures concentric with the bottom support 6, and the upper end of the I-shaped steel is fixed in the middle of the lower surface of the bottom support 6; wherein the distance between the hanging points at the lower end of the hanging steel wire rope 2 is not more than 3 m. In the technical scheme, the thickness of the bottom support is 20mm, the type of the I-shaped steel is I-shaped 14 steel, the I-shaped steel is welded at the middle position of the lower surface of the bottom support, and the distance between the hanging points at the lower end of the hanging steel wire rope is determined according to the I-shaped steel arranged on the lower surface of the bottom support.
In another technical scheme, a downward annular first groove is further formed in the upper surface of the bottom support 6, and the first groove can be just clamped with the bottom end of the sleeve 3; the outer side wall of the bottom end of the sleeve 3 is also provided with an upward annular second groove, the second groove can be just clamped with the outer wall of the first groove, the first groove and the second groove are both composed of magnetic blocks, and the magnetism of the first groove and the magnetism of the second groove are opposite, so that the first groove and the second groove are mutually attracted. In the technical scheme, the arrangement of the groove can further strengthen the direct sealing of the bottom support and the sleeve; the magnetic suspension device is composed of magnetic blocks, the magnetic blocks are opposite in magnetism, better sealing can be achieved, meanwhile, due to the fact that the magnetic blocks are opposite in attraction, certain upward attraction force exists, and upward pre-tightening force required to be applied by the hanging steel wire rope can be reduced to a certain degree.
In another technical scheme, the upper surface of the bottom support 6 is also provided with a flexible water stop strip. In this kind of technical scheme, the sealed effect that sets up flexible sealing rod is better because sealed good or bad direct relation to the quality of back cover concrete placement and the success or failure of whole scheme.
The invention also provides a construction method by using the device for reducing the thickness of the bottom sealing concrete of the steel suspension box cofferdam, which is characterized by comprising the following steps:
step 1), lowering a steel casing to a set position, and constructing drilled piles in the steel casing until all the drilled piles are constructed;
step 2) welding a rib plate or I-shaped steel on the lower surface of the bottom support, fixing the bottom end of a hanging steel wire rope on the bottom support, then hanging the bottom support by the hanging steel wire rope, sliding the bottom support to the lower part from the upper end of the steel protection cylinder along the outer wall of the steel protection cylinder, and enabling the upper end of the hanging steel wire rope to penetrate through an ear plate hole formed in the outer wall of the upper end of the steel protection cylinder and be hung on the steel protection cylinder; before the bottom sealing concrete is poured, after vertical pretightening force is applied to the upper end of the hanging steel wire rope and the hanging steel wire rope is fixed, the bottom support can be in seamless fit with the sleeve when the bottom sealing concrete is poured;
step 3) assembling the steel suspension box cofferdam by depending on the steel protecting cylinders, welding sleeves on the inner wall of bottom holes of the steel suspension box cofferdam, and welding inclined struts on the upper surface and the lower surface of a bottom plate of the steel suspension box cofferdam;
step 4), after the whole structure is assembled and welded, the steel suspension box cofferdam is put in place and positioned by using putting equipment;
before pouring bottom sealing concrete, lifting a hanging steel wire rope at the top opening of the steel casing until the bottom support is tightly attached to the sleeve, and then locking the hanging steel wire rope;
step 6), pouring bottom sealing concrete of the steel hanging box cofferdam underwater to enable the bottom sealing concrete to be combined with the steel hanging box cofferdam, the steel pile casing, the sleeve and the bottom support into a whole;
and 7) after the strength of the bottom sealing concrete reaches the design requirement, pumping water in the steel suspension box cofferdam, cutting the suspension steel wire rope and the steel casing on the upper part of the bottom sealing concrete, and carrying out bearing platform construction.
In another technical solution, the step 2) further includes: welding a first groove on the upper surface of the bottom support; the step 3) further comprises the following steps: welding a second groove on the outer side wall of the lower end of the sleeve; the step 5) further comprises the following steps: when the steel casing top opening is used for lifting and hanging the steel wire rope, the first groove is clamped with the bottom end of the sleeve, and the second groove is clamped with the outer wall of the first groove.
While embodiments of the invention have been described above, it is not intended to be limited to the details shown, described and illustrated herein, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed, and to such extent that such modifications are readily available to those skilled in the art, and it is not intended to be limited to the details shown and described herein without departing from the general concept as defined by the appended claims and their equivalents.
Claims (10)
1. A device for reducing the thickness of concrete at the bottom sealing of a steel suspension box cofferdam comprises: steel suspension box cofferdam, steel protect a section of thick bamboo, its characterized in that still includes:
the sleeve is a hollow cylinder coaxial with the bottom hole of the steel suspension box cofferdam, the outer wall of the sleeve is welded to the inner wall of the bottom hole of the steel suspension box cofferdam, the upper end and the lower end of the sleeve protrude out of the bottom plate of the steel suspension box cofferdam, and the inner diameter of the sleeve is larger than the outer diameter of the steel casing;
the collet is of an annular structure, the inner diameter of the collet is set to enable the collet to be attached to the outer wall of the steel casing and can slide up and down, and the outer diameter of the collet is set to be larger than that of the sleeve;
and the lower end of the hanging steel wire rope is hung on the bottom support.
2. The device for reducing the thickness of the bottom sealing concrete of the steel suspension box cofferdam of claim 1, wherein the upper end of the sleeve is 0.3-0.7 m higher than the upper surface of the steel suspension box cofferdam bottom plate, the bottom end of the sleeve is 1.0-1.5 m lower than the upper surface of the steel suspension box cofferdam bottom plate, and the distance between the inner diameter of the sleeve and the outer diameter of the steel casing is 0.15-0.35 m.
3. The apparatus for reducing the thickness of the concrete at the bottom of a steel suspension box cofferdam as recited in claim 1, further comprising: the inclined strut is fixedly connected with the sleeve and the steel suspension box cofferdam bottom plate, and circles are uniformly arranged on the upper surface and the lower surface of the steel suspension box cofferdam bottom plate in an encircling manner.
4. The device for reducing the thickness of the bottom sealing concrete of the steel hanging box cofferdam according to claim 1, wherein a plurality of rib plates are uniformly and annularly arranged on the lower surface of the bottom support, the rib plates are integrally formed by an upper cuboid plate and a lower right-angle trapezoidal plate, the upper end of the upper cuboid plate is fixed on the lower surface of the bottom support, the distance between the inner end and the outer end of the upper cuboid plate of the rib plates is the same as the width of the bottom support, the lower end of the upper cuboid plate is matched with the long bottom edge of the lower right-angle trapezoidal plate, and the oblique waist edge of the lower right-angle trapezoidal plate faces to the outer side of the bottom support; wherein the distance between two adjacent rib plates is less than 0.3m, and the distance between the hanging points at the lower end of the hanging steel wire rope is not more than 1.5 m.
5. The device for reducing the thickness of the concrete at the bottom sealing of the steel suspension box cofferdam of claim 1, wherein the bottom support is further provided with an I-shaped steel, the upper end and the lower end of the I-shaped steel are both of annular structures concentric with the bottom support, and the upper end of the I-shaped steel is fixed in the middle of the lower surface of the bottom support; wherein, the distance between the hanging points at the lower end of the hanging steel wire rope is not more than 3 m.
6. The apparatus for reducing the thickness of the concrete for the closing bottom of the steel suspension box cofferdam of claim 1,
the upper surface of the bottom support is also provided with a downward annular first groove, and the first groove can be just clamped with the bottom end of the sleeve;
the outer side wall of the bottom end of the sleeve is also provided with an upward annular second groove, and the second groove can be just clamped with the outer wall of the first groove.
7. The device for reducing the thickness of the concrete at the bottom sealing of the steel suspension box cofferdam of claim 6, wherein the first groove and the second groove are both made of magnetic blocks, and the magnetism of the first groove and the second groove is opposite, so that the first groove and the second groove are mutually attracted.
8. The apparatus for reducing the thickness of the bottom sealing concrete of the steel suspension box cofferdam of claim 1, wherein the upper surface of the bottom support is further provided with a flexible water stop strip.
9. A method for constructing by using a device for reducing the thickness of the bottom sealing concrete of a steel suspension box cofferdam is characterized by comprising the following steps:
step 1), lowering a steel casing to a set position, and constructing drilled piles in the steel casing until all the drilled piles are constructed;
step 2) welding a rib plate or I-shaped steel on the lower surface of the bottom support, fixing the bottom end of a hanging steel wire rope on the bottom support, then hanging the bottom support by the hanging steel wire rope, sliding the bottom support to the lower part from the upper end of the steel protection cylinder along the outer wall of the steel protection cylinder, and enabling the upper end of the hanging steel wire rope to penetrate through an ear plate hole formed in the outer wall of the upper end of the steel protection cylinder and be hung on the steel protection cylinder; before the bottom sealing concrete is poured, after vertical pretightening force is applied to the upper end of the hanging steel wire rope and the hanging steel wire rope is fixed, the bottom support can be in seamless fit with the sleeve when the bottom sealing concrete is poured;
step 3) assembling the steel suspension box cofferdam by depending on the steel protecting cylinders, welding sleeves on the inner walls of bottom holes of the steel suspension box cofferdam, and welding inclined support frames on the upper surface and the lower surface of a bottom plate of the steel suspension box cofferdam;
step 4), after the whole structure is assembled and welded, the steel suspension box cofferdam is put in place and positioned by using putting equipment;
before pouring bottom sealing concrete, lifting the hanging steel wire rope at the top opening of the steel casing until the bottom support is seamlessly attached to the sleeve, and then locking the hanging steel wire rope;
step 6), pouring bottom sealing concrete of the steel hanging box cofferdam underwater, so that the bottom sealing concrete is combined with the steel hanging box cofferdam, the steel casing, the sleeve and the bottom support into a whole;
and 7) after the strength of the bottom sealing concrete reaches the design requirement, pumping water in the steel suspension box cofferdam, cutting the suspension steel wire rope and the steel casing on the upper part of the bottom sealing concrete, and carrying out bearing platform construction.
10. The method for constructing the device for reducing the thickness of the bottom sealing concrete of the steel suspension box cofferdam according to claim 9,
the step 2) further comprises the following steps: welding a first groove on the upper surface of the bottom support;
the step 3) further comprises the following steps: a second groove is welded on the outer side wall of the lower end of the sleeve;
the step 5) further comprises the following steps: when the steel casing top opening is used for lifting and hanging the steel wire rope, the first groove is clamped with the bottom end of the sleeve, and the second groove is clamped with the outer wall of the first groove.
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