CN212294709U - Steel sheet pile and earth dam combination cofferdam - Google Patents
Steel sheet pile and earth dam combination cofferdam Download PDFInfo
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- CN212294709U CN212294709U CN202021060573.0U CN202021060573U CN212294709U CN 212294709 U CN212294709 U CN 212294709U CN 202021060573 U CN202021060573 U CN 202021060573U CN 212294709 U CN212294709 U CN 212294709U
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Abstract
The utility model relates to a bridge engineering construction technical field provides a steel sheet pile and earth dam combination cofferdam, enclose the earth dam filling area who closes formation including inlayer steel sheet pile, outer steel sheet pile and inlayer steel sheet pile and outer steel sheet pile. The cofferdam construction method can limit slope releasing of the earth dam cofferdam and occupation of river channel width, control the construction operation range of the cofferdam, reduce the water blocking area of the cofferdam, improve the anti-permeability capability and have strong overall stability of the cofferdam.
Description
Technical Field
The utility model relates to a bridge engineering construction technical field particularly, relates to a steel sheet pile and earth dam combination cofferdam.
Background
At present, the wading pier cofferdam comprises an earth cofferdam, an earth bag cofferdam, a steel sheet pile cofferdam, a steel cofferdam, a reinforced concrete open caisson cofferdam and different cofferdams with different trial conditions.
When the foundation engineering of the piers of the subordinate bridges in subordinate city areas is built, the river management department and the environment monitoring part both put forward specific requirements on the building of the foundation of the pier involving the water due to the fact that the river Liuxi river is protected by crossing drinking water sources in Guangzhou cities, and the specific requirements comprise that the island building construction range is limited, the island building construction is strictly forbidden, the turbidity of the river is changed, and the quality of the water source is influenced. And the difficulty that the riverbed covering layer is thin and the steel sheet piles cannot be driven into the riverbed to form enough anchoring depth exists. It is therefore desirable to provide a cofferdam system that solves the above problems.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a steel sheet pile and earth dam combination cofferdam, it can restrict the earth dam cofferdam and put the slope and occupy the river course width, and control cofferdam construction operation scope reduces the cofferdam area that blocks water, improves impervious ability, overall stability is strong.
The embodiment of the utility model discloses a realize through following technical scheme:
the utility model provides a steel sheet pile and earth dam combination cofferdam, includes inlayer steel sheet pile, outer steel sheet pile and inlayer steel sheet pile and outer steel sheet pile enclose the earth dam filling area who closes formation, and the inboard of inlayer steel sheet pile is equipped with the solid foot and prevents toppling the gird.
Furthermore, a plurality of opposite pull rods are further arranged and arranged in the earth dam filling area, one ends of the opposite pull rods are fixed to the inner-layer steel sheet piles, and the other ends of the opposite pull rods are fixed to the outer-layer steel sheet piles.
Furthermore, a plurality of inner supporting rods are further arranged, the inner supporting rods are arranged in the enclosed area of the inner layer steel sheet pile, and two ends of each inner supporting rod are respectively fixed to two opposite sides of the inner layer steel sheet pile.
Furthermore, the inner layer steel sheet pile and the outer layer steel sheet pile are provided with enclosing purlins.
Furthermore, a drainage ditch is arranged at the top of the foot fixing overturn-preventing ring beam.
Furthermore, a foundation pit bottom surface concrete cushion layer and a bearing platform arranged above the foundation pit bottom surface concrete cushion layer are arranged in the enclosing area of the inner layer steel sheet pile.
Furthermore, outer steel sheet pile disposes the location reinforcing pile, and location reinforcing pile pours and installs before outer steel sheet pile.
Furthermore, a guide way filling area is further arranged, the guide way filling area is in through connection with the earth dam filling area at one end face and forms a through connection face, and the outer layer steel sheet pile is arranged to avoid the through connection face.
A construction method of a karst bearing platform cofferdam of a gentle-dip bedrock riverbed with less overburden layers comprises the following steps:
a. determining the island building range, and pouring the existing slag soil on the side close to the shore to form an upper island channel, wherein the outer edge of the island surface is wider than the position of the inner layer steel sheet pile, and the island surface is higher than the construction water surface;
b. positioning piles of outer steel sheet piles are constructed by the rotary drilling rig equipment in an approach mode, concrete is poured to island surfaces after holes are formed, and the embedded profile steel is used as positioning reinforcing piles of the outer steel sheet pile cofferdam;
c. removing a rotary drilling rig, inserting and driving outer-layer steel sheet piles on an upper island of a piling machine, measuring the axes of the positioning steel sheet piles, inserting and driving outer-side positioning angle piles in advance, installing guide beams, respectively inserting and driving the guide beams in the upstream and downstream directions, and finally inserting and driving short-edge steel sheet piles in the upstream and downstream directions to the bank side to form the U-shaped semi-closed steel cofferdam;
d. withdrawing the equipment, filling the cofferdam to the designed height, laying a drilling operation cushion layer, and completing the construction of the foundation pile;
e. withdrawing the bored pile construction equipment, laying an operation cushion layer, and inserting and driving steel sheet piles at the inner layer of the cofferdam;
f. excavating the cofferdam to the rock surface of the riverbed, mounting templates around the steel plate pile feet after leveling, and pouring concrete to form a foot-fixing anti-overturning ring beam;
g. and after the strength of the foot fixing overturn prevention ring beam concrete meets the requirement, continuously constructing the bearing platform.
The utility model discloses technical scheme has following advantage and beneficial effect at least:
1. the inner layer steel sheet piles and the outer layer steel sheet piles play a role in limiting slope releasing of the earth dam, limiting the width of a river channel occupied by the earth dam, and controlling and reducing the construction operation range of the cofferdam;
2. the inner layer steel sheet pile and the outer layer steel sheet pile can prevent the earth dam from being washed, lost and collapsed by rivers, reduce the water blocking area of the cofferdam and improve the anti-permeability capability;
3. soil is filled between the inner layer steel sheet pile and the outer layer steel sheet pile to form an earth dam, the gravity of the cofferdam is increased, the overall stability of the cofferdam is improved, the capability of resisting the flood peak scouring is improved, and the waterproof and seepage-proofing capabilities of the cofferdam are further improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a top view of the combined cofferdam of steel sheet pile and earth dam provided by the embodiment of the utility model;
fig. 2 is a top view of the steel sheet pile and earth dam combined cofferdam provided with an approach according to the embodiment of the present invention;
FIG. 3 is a vertical cross-sectional view of FIG. 2;
FIG. 4 is an enlarged view of a portion of FIG. 3 at A;
fig. 5 is a schematic view of a process of a embankment construction method for a soft-dip bedrock riverbed with less overburden.
Icon: 100-inner layer steel sheet pile, 110-counter-pull rod, 120-inner support rod, 130-purlin, 200-outer layer steel sheet pile, 300-earth dam filling area, 400-foot-fixing anti-overturning ring beam, 500-bearing platform, 510-foundation pit bottom surface concrete cushion layer, 600-approach filling area, 610-through junction, 700-construction period highest water level, 710-riverbed foundation rock surface, 720-cofferdam soil filling slope toe line and 730-steel sheet pile central axis.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that, if the terms "center", "upper", "lower", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when used, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred to must have a specific position, be constructed and operated in a specific position, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," and "connected" should be interpreted broadly, and may be, for example, 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 invention can be understood in specific cases to those skilled in the art.
Example 1
Referring to fig. 1 to 4, fig. 1 to 4 provide a steel sheet pile and earth dam combined cofferdam.
An object of the utility model is to provide a steel sheet pile and earth dam combination cofferdam, it can restrict the earth dam cofferdam and put the slope and occupy the river course width, and control cofferdam construction operation scope improves the cofferdam and blocks water, impervious ability, and cofferdam overall stability is strong. The method is suitable for the shoals with limited construction operation range, thin riverbed covering layers and insufficient anchoring depth, the water depth is 3-5 m and the flow speed is 1-3 m/s, and the steel sheet piles cannot be driven into the riverbed.
The embodiment of the utility model discloses a realize through following technical scheme:
referring to fig. 1 to 3, a steel sheet pile and earth dam combined cofferdam includes an inner steel sheet pile 100, an outer steel sheet pile 200, and an earth dam filling area 300 enclosed by the inner steel sheet pile 100 and the outer steel sheet pile 200.
The inventor finds that when the bridge engineering construction relates to the condition of protecting a river by applying a water source, the difficulties comprise strictly prohibiting island construction, changing the turbidity of river water, influencing the quality of the water source, limiting the island construction range and improving the difficulty and the requirement of building the foundation of the water-involved pier.
The inventor invents a steel sheet pile and earth dam combined cofferdam, which is formed by enclosing a composite earth dam filling area 300 by two layers of steel sheet piles, filling earth in the earth dam filling area 300 to form an earth dam, and filling the earth dam by using viscous soil with small permeability coefficient. The two layers of steel sheet piles comprise an inner layer of steel sheet pile 100 and an outer layer of steel sheet pile 200, and a pouring construction space of a bearing platform 500 is reserved in the center of the inner layer of steel sheet pile 100.
The inner layer steel sheet piles 100 and the outer layer steel sheet piles 200 play a role in limiting slope releasing of the earth dam cofferdam and limiting the width of a river channel occupied by the earth dam cofferdam, and control and reduce the construction operation range of the cofferdam. And the inner layer steel sheet pile 100 and the outer layer steel sheet pile 200 can prevent the earth dam from being washed, lost and collapsed by rivers, and improve the water blocking and seepage resisting capability of the cofferdam. Soil is filled between the inner layer steel sheet pile 100 and the outer layer steel sheet pile 200 to form an earth dam, the gravity of the cofferdam is increased, the overall stability of the cofferdam is improved, the capability of resisting the flood peak scouring is improved, and the waterproof and seepage-proofing capabilities of the cofferdam are further improved.
To sum up, such steel sheet pile and earth dam combination cofferdam can restrict the earth dam cofferdam and put the slope and occupy the river course width, control cofferdam construction operation scope, improve cofferdam water-blocking, impervious ability, and cofferdam overall stability is strong.
Referring to fig. 3, fig. 3 shows an illustration of the highest water level 700 during construction, in the solution of the combined cofferdam of steel sheet piles and earth dams, the design height of the earth dam defined by the steel sheet piles must be higher than the highest water level 700 during construction.
The structural form of the steel sheet pile and earth dam combined cofferdam is shown in fig. 1, and is used when a pier far from both banks in a river needs to be moved by an auxiliary trestle for tooling.
Aiming at the construction of the pier in the river close to the river banks at two sides and relating to the approach, according to the same inventive concept, the following scheme is adopted: referring to fig. 2, fig. 2 shows a walkway and riverbed bedrock face 710, and a walkway filling area 600 is further provided under the structural form of the inner layer steel sheet pile 100, the outer layer steel sheet pile 200 and the dam filling area 300. The approach filling area 600 is connected with the earth dam filling area 300 at one end face in a penetrating manner and forms a penetrating joint face 610, the outer layer steel sheet pile 200 is arranged to avoid the penetrating joint face 610, and the outer layer steel sheet pile is not closed at the joint part of the channel and the cofferdam and is connected with the steel sheet piles at two sides of the channel deep water area. The approach filling area 600 is used for filling soil to form an approach and provide a tool walking path.
Further, referring to fig. 3, the inner side of the inner layer steel sheet pile 100 is provided with a foot-fixing anti-overturning ring beam 400, and the foot-fixing anti-overturning ring beam 400 is used for preventing inward deformation of the steel sheet pile foot without anchoring depth, so as to improve the stability of the steel sheet pile. The top of the foot-fixing overturn-preventing ring beam 400 can be provided with a drainage ditch, which has a drainage function and increases the stability of the foundation pit wall in the weir.
Further, referring to fig. 3 and 4, the combined cofferdam is further provided with a plurality of tie rods 110, the tie rods 110 are arranged in the filling area 300 of the earth dam, one end of each tie rod 110 is fixed to the inner layer steel sheet pile 100, and the other end is fixed to the outer layer steel sheet pile 200. The deformation of the inner layer steel sheet pile 100 and the outer layer steel sheet pile 200 is limited by the tie rods 110, so that the overall stability is improved.
Furthermore, a plurality of inner supporting rods 120 are further provided, the inner supporting rods 120 are disposed in the enclosed area of the inner layer steel sheet pile 100, and two ends of each inner supporting rod 120 are respectively fixed to two opposite sides of the inner layer steel sheet pile 100. The inner support can adopt steel pipe piles with the diameter of 500-650 mm and the wall thickness of t 10-15 mm, the specific models and the arrangement can be determined according to the safety requirements, and the length can be cut according to the size of the cofferdam. The deformation of the inner layer steel sheet pile 100 is limited by the inner support rod 120, and the overall stability is improved.
Further, the inner layer steel sheet pile 100 and the outer layer steel sheet pile 200 are provided with surrounding purlins 130. Purlin 130 can adopt I shaped steel or H shaped steel, and the model chooses for use according to the safety requirement.
Further, a foundation pit bottom concrete cushion 510 and a bearing platform 500 disposed above the foundation pit bottom concrete cushion 510 are disposed in the enclosed area of the inner layer steel sheet pile 100.
Further, the outer layer steel sheet pile 200 is configured with a positioning reinforcing pile, and the positioning reinforcing pile is poured before the outer layer steel sheet pile 200 is installed. The outer layer steel sheet pile 200 is positioned by the positioning reinforcing pile, and the deformation resistance is enhanced. The steel sections can be pre-buried to serve as positioning reinforcing piles of the outer layer steel sheet pile 200 cofferdam. The method specifically comprises the steps of constructing the positioning pile of the outer steel sheet pile 200 in the field by rotary drilling equipment, pouring concrete to an island surface after pore forming, and using pre-buried section steel as a positioning reinforcing pile of the outer steel sheet pile 200 cofferdam, wherein the diameter phi of the positioning pile is 80 cm.
Example 2
Referring to fig. 5, the present embodiment provides a cofferdam construction method for a soft-dip bedrock riverbed rock bearing platform 500 with less overburden, which includes the following steps:
a. determining the island building range, and filling the existing slag soil on the side close to the bank to form an upper island channel, wherein the outer edge of the island surface is wider than the 100 positions of the inner layer steel sheet piles, and the island surface is higher than the construction water surface;
b. positioning piles of the outer-layer steel sheet pile 200 are constructed by the rotary drilling rig equipment in an approach way, concrete is poured to the island surface after hole forming, and the embedded profile steel is used as positioning reinforcing piles of the outer-layer steel sheet pile 200 cofferdam;
c. removing the rotary drilling rig, inserting and driving outer-layer steel sheet piles 200 on an upper island of a piling machine, measuring the axes of the positioning steel sheet piles, inserting and driving outer-side positioning angle piles in advance, installing guide beams, respectively inserting and driving the guide beams in the upstream and downstream directions, and finally inserting and driving steel sheet piles on the short edges of the upstream and the downstream to the bank side to form the U-shaped semi-closed steel cofferdam;
d. withdrawing the equipment, filling the cofferdam to the designed height, laying a drilling operation cushion layer, and completing the construction of the foundation pile;
e. withdrawing the bored pile construction equipment, laying an operation cushion layer, and inserting and driving the steel sheet pile 100 on the inner layer of the cofferdam;
f. excavating the cofferdam to the rock surface of the riverbed, mounting templates around the steel plate pile feet after leveling, and pouring concrete to form a foot-fixing anti-overturning ring beam 400;
g. after the strength of the concrete of the foot-fixing overturn-preventing ring beam 400 meets the requirement, the bearing platform 500 is continuously constructed.
And b, designing a steel sheet pile cofferdam before determining the island building range in the step a, wherein the outer edge of the island surface is wider than the preset position of the inner layer steel sheet pile 100 and is higher than the construction water surface, for example, the island building height is 1.8m wider than the construction water surface, and the island building height is 0.5m higher than the construction water surface. As shown in fig. 1 and 2, cofferdam fill strip lines 720 are shown outside the central axis 730 of the steel sheet pile.
In the island building operation, after the island building range is measured and determined, a land slope and a foundation construction island surface connecting channel are filled with a muck material, and the island is gradually filled to the island building position; after the outer steel sheet pile 200 is inserted and driven, the inner side is filled to a designed height by adopting sticking.
Step c specifically includes, with respect to the installation of the outer layer steel sheet pile 200: measuring and determining the axis of the outer layer steel sheet pile 200, firstly inserting and driving a guide beam positioning pile, and installing a guide beam; the outer layer steel sheet pile 200 is directly driven by a vibration hammer, the driving is stopped when the steel sheet pile is driven to the surface of the foundation rock, and the piling equipment is withdrawn after the driving is finished; drilling an entry hole of a rotary drilling rig to construct four-corner positioning piles of the outer-layer steel sheet pile 200, pouring underwater concrete to an island surface after hole forming, and pre-burying the section steel positioning pile and the concrete; continuously inserting and driving the steel sheet piles at the upper and lower sides to the bank side, and forming a semi-closed U-shaped cofferdam by the outer steel sheet pile 200; filling soil in cofferdam to design elevation
Wherein before the steel sheet pile is installed and used, the steel sheet pile needs to be inspected and reasonably arranged in usual stacking.
Step e specifically includes, with respect to the installation of the inner layer steel sheet pile 100: measuring the design axis of the steel sheet pile according to the design scheme, and setting a drilling operation mark; measuring and positioning the axis of the inner layer steel sheet pile 100, inserting and driving an upstream side corner pile and a downstream side positioning pile in advance, and installing a guide beam; inserting and driving one by one or one by one from the upstream corner piles to the downstream, dismantling the guide beam after the insertion and driving are finished, monitoring the axis of the steel sheet pile in time in the inserting and driving process, and correcting the deviation in time; stopping inserting and driving when 5-6 piles remain, measuring the length of the axis of the short edge at the downstream side, correcting the error and matching the piles; and inserting and driving the folded steel sheet piles at the short edges.
The construction method of the karst cap 500 cofferdam of the gentle dip bedrock riverbed with a small overburden is applied to the construction method of the combined cofferdam of the steel sheet pile and the earth dam in the embodiment 1 at the bank side and the underwater bridge pier related to the approach. When the device is not on the shore and does not relate to the filling consideration of the approach, the approach filling operation is not needed correspondingly.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (8)
1. The utility model provides a steel sheet pile and earth dam combination cofferdam which characterized in that: the dam filling area is formed by enclosing the inner layer steel sheet piles and the outer layer steel sheet piles, and the inner sides of the inner layer steel sheet piles are provided with foot fixing and overturn preventing ring beams.
2. The steel sheet pile and earth dam combined cofferdam of claim 1, wherein: the earth dam filling area is provided with a plurality of opposite pull rods, the opposite pull rods are arranged in the earth dam filling area, one ends of the opposite pull rods are fixed to the inner-layer steel sheet piles, and the other ends of the opposite pull rods are fixed to the outer-layer steel sheet piles.
3. The steel sheet pile and earth dam combined cofferdam of claim 1, wherein: the steel plate pile internal supporting device is characterized by further comprising a plurality of internal supporting rods, wherein the internal supporting rods are arranged in the enclosed area of the internal layer steel plate pile, and two ends of each internal supporting rod are respectively fixed to two opposite sides of the internal layer steel plate pile.
4. The steel sheet pile and earth dam combined cofferdam of claim 1, wherein: and the inner layer steel sheet pile and the outer layer steel sheet pile are provided with surrounding purlins.
5. The steel sheet pile and earth dam combined cofferdam of claim 1, wherein: and a drainage ditch is arranged at the top of the foot fixing overturn preventing ring beam.
6. The steel sheet pile and earth dam combined cofferdam of claim 1, wherein: and a foundation pit bottom surface concrete cushion layer and a bearing platform arranged above the foundation pit bottom surface concrete cushion layer are arranged in the enclosing area of the inner layer steel sheet pile.
7. The steel sheet pile and earth dam combined cofferdam of claim 1, wherein: and the outer layer steel sheet pile is provided with a positioning reinforcing pile, and the positioning reinforcing pile is poured before the outer layer steel sheet pile is installed.
8. The steel sheet pile and earth dam combined cofferdam of any one of claims 1-7, wherein: the soil dam filling area is communicated with the soil dam filling area at one end face, and a through joint face is formed at the through joint.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021060573.0U CN212294709U (en) | 2020-06-10 | 2020-06-10 | Steel sheet pile and earth dam combination cofferdam |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021060573.0U CN212294709U (en) | 2020-06-10 | 2020-06-10 | Steel sheet pile and earth dam combination cofferdam |
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| CN212294709U true CN212294709U (en) | 2021-01-05 |
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