CN113073666B - Island building process for high slope peninsula cable tower construction platform - Google Patents
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- CN113073666B CN113073666B CN202110302455.9A CN202110302455A CN113073666B CN 113073666 B CN113073666 B CN 113073666B CN 202110302455 A CN202110302455 A CN 202110302455A CN 113073666 B CN113073666 B CN 113073666B
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/18—Reclamation of land from water or marshes
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0283—Retaining or protecting walls characterised by constructional features of mixed type
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A10/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE at coastal zones; at river basins
- Y02A10/11—Hard structures, e.g. dams, dykes or breakwaters
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Abstract
The invention discloses a high slope peninsula cable tower construction platform island building process, which adopts a mode of building an island body peripheral retaining wall by stacking concrete prefabricated blocks, synchronously carries out the manufacturing of island body building materials at the periphery of an island, namely concrete prefabricated blocks, and the excavation construction of peninsula part foundations, carries out the stacking work of the island body peripheral retaining wall building during the low tide period, and meanwhile, the mountain slag stones excavated from the peninsula foundations are timely used as filling materials in a cofferdam formed by the island body peripheral retaining wall building, thereby realizing the purpose of quickly and effectively forming a construction platform in the peninsula construction environment influenced by coastal semidiurnal tide. The construction platform can be quickly and effectively formed in a peninsula construction environment affected by coastal semisolar tides, the precast blocks can effectively guarantee the controllable quality of retaining wall entities, meanwhile, the waste stone is fully utilized, the construction progress of the construction platform is accelerated, the construction cost is low, and the construction efficiency is high.
Description
Technical Field
The invention relates to the technical field of cable tower construction. More specifically, the invention relates to a high slope peninsula cable tower construction platform island building process.
Background
At present, in the coastal and offshore environment of the Yangtze river, for the offshore bridge foundation construction, a steel platform is mostly erected, a trestle is gradually erected from the land into the water through the steel trestle, then a bearing beam and a steel panel are erected in the range of a bearing platform through reasonably arranging steel pipe piles on the basis of the trestle, a construction platform connected with the land is formed, and after the construction of a cable tower is completed, the construction is gradually dismantled from the water to the shore side. In addition, for the offshore bridge foundation, a stable and reliable construction platform is formed by sand blasting backfill according to the specific terrain environment, or a steel platform which is the same as that of the offshore cable tower foundation is adopted, as shown in fig. 1.
In the steel platform or the sand-blowing filling platform, long construction period is required from raw material purchase, design checking calculation, equipment entry to final engineering construction in the construction process, and a large amount of manpower and material resources are occupied. In the traditional steel platform or hydraulic fill platform island construction project, large equipment is required to finish hoisting and material transportation during construction. On one hand, the working surface cannot be widely spread, on the other hand, the occupation of the channel during the construction of the large-scale ship needs to handle a series of construction permission certificates, and necessary navigation inhibition and navigation aid facilities are arranged on the channel. The dispatching cycle of large equipment is long, and the safety risk during construction is large. To the construction platform under the island environment, the material has more been restricted, the input of equipment and personnel advance and retreat the field, and then further increased the construction degree of difficulty.
In addition, in the coastal environment, due to the influence of fluctuation tide, in the driving process of the steel pipe pile of the steel platform, the anchoring position of the ship must be adjusted by the positioned ship according to the fluctuation tide condition. The ship machine equipment for building the island by blowing sand is also influenced by tides, and the average fluctuation tide is 6 hours for irregular semi-solar tide zones, so that the construction time which can be effectively utilized is greatly reduced by frequent ship displacement. For the steel platform foundation, after the steel pipe piles are constructed, the parallel connection needs to be welded in time to connect the independent steel pipe pile foundations into a pile group so as to reduce the probability of pile falling of a single pile foundation under the condition of high flow velocity due to fluctuation tide. Due to the influence of fluctuation tide and construction period, the parallel connection between piles cannot be welded in place at one time, so that most coastal steel platforms are put into use under the condition that a stable structure is not completely formed. The steel platform is extremely risky to use during periods of use, supplementing the connection structure during low tide.
For the cable tower foundation arranged on the island in the bay, the offshore construction environment of the cable tower foundation puts higher requirements on construction organization such as material turnover of construction, navigation conditions on a navigation channel and the like and safety control during construction.
Disclosure of Invention
The invention aims to provide a high-slope peninsula cable tower construction platform island building process, which adopts a prefabricated block mode to synchronously manufacture the island building material at the periphery of a building island and excavation construction of a peninsula part foundation, and can quickly and effectively form a construction platform in a peninsula construction environment influenced by coastal semiday tides.
In order to realize the purposes and other advantages of the invention, the invention provides a high slope peninsula cable tower construction platform island building process, which adopts a mode of stacking and building an island peripheral retaining wall by using concrete precast blocks, synchronously carries out the manufacturing of the island building material at the periphery of the island, namely the concrete precast blocks and the excavation construction of a peninsula part foundation, carries out the stacking and building operation of the island building peripheral retaining wall during the low tide period, and simultaneously, the mountain slag stones dug out by the peninsula foundation are timely used as the filling material in the cofferdam formed by the island building peripheral retaining wall, thereby realizing the rapid and effective formation of the construction platform in the peninsula construction environment affected by the coastal semidiurnal tide.
Preferably, the method specifically comprises the following steps:
1) constructing a main access road to form a water retaining wall;
2) prefabricating the concrete precast block on a back site, and conveying the precast block to a construction site, wherein the construction of the following steps is synchronously performed in the process;
3) excavating a side slope during a high tide level period, and preparing a filling material in a cofferdam;
4) stacking prefabricated blocks at a set position on the periphery of the peninsula close to the sea to form an island body peripheral retaining wall, and reserving gaps between the adjacent prefabricated blocks;
5) performing joint filling treatment on the reserved gaps among the prefabricated blocks through fine stone concrete;
6) filling the filling material in the step 3) into a cofferdam formed by a surrounding retaining wall outside the island body, and pouring fine stone concrete layer by layer;
7) after the stacking and the inner filling of the outer side retaining wall of the upstream side island are completed, the construction platform is basically formed, and the construction of the construction platform can be completed by carrying out subsequent construction.
Preferably, the construction steps of the main sidewalk in the step 1) are as follows:
11) building stones along the shoal during the low tide level period, and simultaneously building a retaining wall on the outer side of the main sidewalk;
12) excavating a side slope nearby, and filling the inner side of the retaining wall on the outer side of the main sidewalk with an inner soil and stone space to exceed a high tide level to form a foundation of the main sidewalk;
13) after the main sidewalk is constructed to build the retaining wall, after a layer of building stone is laid after the main sidewalk is exposed out of the water surface, pouring fine stone concrete, manually filling and tamping, filling gaps among the blocks of the retaining wall to be compact, and bonding the upper retaining wall layer by layer and the lower retaining wall layer to be a whole;
14) and measuring a boundary line of the construction platform, and lofting on the finished outer side retaining wall of the main sidewalk.
Preferably, the building height in the step 6) is slightly higher than that of the formed precast block wall top, so that water drainage is facilitated.
Preferably, in the step 4), the precast blocks are piled and laid by utilizing intertidal staggering, a measurer measures the position of the outer enclosure barrier wall of the island in real time every day as required, and the precast blocks are piled and laid layer by layer in a segmented manner, and gaps are reserved.
Preferably, the method for stacking the precast blocks specifically comprises the following steps: the prefabricated section is dug quick-witted successive layer sign indicating number by manual work cooperation, and the sign indicating number is the wedge and gos forward, and it is far away to build the position of advancing of island external enclosure bulkhead bottom promptly, and the upper strata reduces gradually, and the sign indicating number bottom during the low tide impels forward, and the part above the surface of water of sign indicating number rear during the high tide.
Preferably, the prefabricated section divide into inside and outside two rows on the plane, piece staggered arrangement, the individual layer prefabricated section after the piling up, utilize quick setting cement mortar to carry out the bonding of caulking, upper and lower layer prefabricated section and the individual layer prefabricated section between form wholly fast, increase the overall stability of cofferdam body.
Preferably, a lifting hook for fixedly lifting the excavator is fixed at the center of the top surface of the precast block.
The invention at least comprises the following beneficial effects:
1. the method is suitable for island construction of an offshore underwater foundation for forming a land type construction site, and is particularly suitable for island construction of a mountain environment, a peninsula type cable tower foundation and a cable tower construction platform influenced by tide in coastal regions.
2. The precast block is adopted as the outer side retaining wall of the island building body, the precast block is manufactured in the back field, the quality of the finished product is controllable, the quality problem caused by that cast-in-place concrete is washed by damp water under the condition of a semi-solar tide is avoided, and the quality controllability of the retaining wall entity is effectively guaranteed.
3. The inner side of the cofferdam is backfilled by using the mountain slag stones excavated by the side slope synchronously, so that the work amount of transporting earth and stone is reduced, meanwhile, the local materials are used, the abandoned earth and stone are fully utilized, the backfilling of the repaired part can be completed in time, and the construction progress of the construction platform is accelerated.
4. The prefabricated block retaining wall is small in size and proper in weight, the outer cofferdams arranged in a double-layer mode can be quickly piled up and formed in the low-tide period, favorable construction conditions are created for inner-side backfilling, the influence of rising and falling tides is reduced to the greatest extent, and the construction period is shortened.
5. During island construction, the construction organization interface is clear, the precast blocks are piled and the inner side is backfilled in a subsection mode, so that the process intersection caused by the cast-in-place of the retaining wall is reduced, and the site construction organization is easier to perform than the traditional cast-in-place retaining wall.
6. During the island construction, the personnel and equipment investment is less, and the construction cost consumption is extremely low.
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 view of a conventional steel platform cable tower foundation construction site form referred to in the background of the invention;
FIG. 2 is a plan view of the cable tower foundation and construction platform of the present invention;
FIG. 3 is a schematic view of the construction of the coastal side retaining wall precast block of the present invention;
fig. 4 is a schematic diagram of the island-building cofferdam formed by the method.
Description of reference numerals:
1. main sidewalk, 2, side slope, 3, island peripheral retaining wall.
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 is to be noted that the experimental methods described in the following embodiments are all conventional methods unless otherwise specified, and the reagents and materials, if not otherwise specified, are commercially available; in the description of the present invention, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, are only for convenience in describing the present invention and simplifying the description, and 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.
As shown in figures 2 to 4, the invention provides a high slope peninsula cable tower construction platform island building process, which adopts a mode of stacking and building an island peripheral retaining wall 3 by concrete precast blocks, synchronously carries out the manufacturing of island building material, namely the concrete precast blocks, at the periphery of the island and the excavation construction of a peninsula part foundation, carries out the stacking and building work of the island building peripheral retaining wall 3 during the low tide, and simultaneously, the mountain slag stones dug out by the peninsula foundation are timely used as filling materials in a cofferdam formed by the island building peripheral retaining wall 3, thereby realizing the rapid and effective peninsula construction environment influenced by coastal semidiurnal tide to form a construction platform.
The construction of the cable tower column is usually on a key line of a project, and the traffic time of the whole project is determined by the influence of the construction speed. In the whole construction period of the cable tower, because the tower column belongs to high-altitude operation and is influenced by the property and the process of concrete, the average construction period of the single-section tower column is 6d, and the compressibility is extremely small. And the construction of cable tower foundation (filling pile and bearing platform) has larger compression space under reasonable organization because the working surface is controllable. Therefore, a construction platform of sufficient size is quickly formed, and the construction period of foundation construction is directly influenced.
In order to quickly and effectively form a construction platform in a peninsula construction environment influenced by coastal semisolar tides, the invention uses a precast block mode to synchronously carry out the manufacturing of the material for building an island body at the periphery of a building island and the excavation construction of a peninsula part foundation; and in the low tide period, the piling and building work of the peripheral retaining wall 3 of the island body is carried out, and meanwhile, the excavated ballast stone is used as a filling material in the cofferdam in time. The wall body after being built can be put into use immediately, and the peripheral maintenance effect is achieved.
In another technical scheme, the island building process of the high slope peninsula cable tower construction platform specifically comprises the following steps:
1) constructing a main access road 1 to form a water retaining wall;
2) prefabricating the concrete precast block on a back site, conveying the precast block to a construction site, and synchronously performing construction in the following steps in the process;
3) excavating a side slope 2 during a high tide level period, and preparing a filling material in a cofferdam;
4) stacking prefabricated blocks at a set position on the periphery of the peninsula close to the sea to form an island peripheral retaining wall 3, and reserving gaps between the adjacent prefabricated blocks;
5) performing joint filling treatment on the reserved gaps among the prefabricated blocks through fine stone concrete;
6) filling the filling material in the step 3) into a cofferdam formed by the enclosing wall 3 outside the island body, and pouring fine stone concrete layer by layer;
7) after 3-layer building and inboard filling of the outer surrounding retaining wall of the upstream side island are completed, the construction platform is basically formed, and subsequent construction is carried out to complete construction of the construction platform.
In another technical scheme, the construction steps of the main access way 1 in the step 1) are as follows:
11) during the low tide level period, building blocks along the shoal, and simultaneously building the outer side retaining wall of the main sidewalk 1;
12) excavating a side slope 2 nearby, and filling the inner side of the outer side retaining wall of the main sidewalk 1 by utilizing the inner side earth and stone to exceed a high tide level to form a foundation of the main sidewalk 1;
13) after the construction of the main sidewalk 1 for building the stone retaining wall is finished, after a layer of stone is laid after the water surface is exposed, pouring fine stone concrete, manually plugging and tamping, filling and compacting gaps among blocks of the retaining wall, and bonding the retaining walls of the upper layer and the lower layer into a whole layer by layer;
14) the boundary line to the construction platform is measured and lofting is performed on the finished outer side retaining wall of the main walkway 1.
One specific embodiment of the present application is as follows:
first, the process principle
The prefabricated block is utilized to form the island cofferdam under the peninsula environment, the characteristic that the prefabricated block can be synchronously prefabricated in the back field is fully utilized, and the prefabricated block can be immediately hoisted for use after being manufactured and transported to a construction site.
The cube concrete prefabricated block is small in size, and hoisting can be easily completed in a limited construction operation surface. Meanwhile, the concrete has a heavy weight, and due to the regular shape of the cubes, the piling in the height direction can be rapidly completed in the fluctuating tide environment. The instability caused by large gaps, insufficient strength and no internal backfill of the wall body due to irregular shape in the process of using stones for stacking is avoided.
The retaining wall is built in a staggered mode between tides, and the position of the retaining wall is measured by a measuring person every day in real time according to needs. The precast block is divided into an inner row and an outer row on the plane, and the splicing seams are arranged in a staggered mode. After the single-layer precast blocks are stacked, joint filling and bonding are carried out by utilizing quick-setting cement mortar, the upper and lower-layer precast blocks and the same-layer precast blocks can be quickly integrated, and the overall stability of the cofferdam body is further improved.
After the outside precast blocks are piled up to a certain height, the inside of the cofferdam is backfilled and compacted by utilizing the mountain slag stones in time, and the filling height can be slightly higher than the formed precast block wall top, so that drainage is facilitated.
The construction platform is integrally connected with the main access road 1, the construction process is a propelling process from the access road to the platform, the access road is mainly propelled in the early period, and after the access road is preliminarily formed, island building construction is further carried out in the sea. The concrete block codes are processed layer by layer in a segmented manner, and the reserved gap is high in filling speed of the inner side in a large range; on the other hand, the water head balance device is used as a rising and falling tide seawater inlet and outlet channel to balance the internal and external water head difference when the complete filling is carried out.
Second, construction process
Step one, during a low tide level period, utilizing an excavator to stack stones along a shoal, excavating a groove at the bottom layer, laying stones with the diameter of about 80-100cm, and building a retaining wall on the outer side of a main sidewalk 1;
secondly, excavating a side slope 2 nearby, and filling the inner side of the retaining wall to exceed a high tide level by using the inner side earth and stones to form a foundation of the main sidewalk 1;
step three, after the constructed sidewalk stone retaining wall is exposed out of the water surface, after a layer of stone is laid, enough fine stone concrete is poured, manual tamping is carried out, gaps among blocks of the retaining wall are filled compactly, and the upper layer retaining wall and the lower layer retaining wall are bonded into a whole layer by layer;
step four, measuring and lofting the boundary line of the construction platform on the finished retaining wall to ensure the accurate peripheral position of the retaining wall;
step five, prefabricating a C25 concrete block with the size of 1m gamma 1m at the rear field, and reserving a hanging rib in the concrete block. The materials are transported to the site through a flat car;
step six, excavating a side slope 2 during a high tide level period, and preparing a filling material in the cofferdam;
step seven, the prefabricated blocks are piled up layer by manual cooperation with an excavator, the piled blocks advance in a wedge shape, namely, the advancing position of the bottom of the blocking wall 3 outside the island building body is far, the distance gradually decreases towards the upper layer, the bottom is piled up and pushed forward during low tide, and the part above the water surface behind the piled blocks is piled up during high tide;
step eight, reserving gaps among the prefabricated blocks, and filling the gaps with fine stone concrete;
step nine, filling mountain slag stones on the inner side of the outer enclosure wall 3 of the island building body, and pouring fine stone concrete layer by layer;
step ten, after 3 yards of the outer enclosure retaining walls of the upstream side island and the inner side filling are finished, the construction site is basically formed, and after the site is leveled, the site can be hardened in a subarea mode according to the specified site plan.
While embodiments of the invention have been described above, it is not limited to the applications set forth in the description and the embodiments, which are fully applicable in various fields of endeavor to which the invention pertains, and further modifications may readily be made by those skilled in the art, it being understood that the invention is not limited to the details shown and described herein without departing from the general concept defined by the appended claims and their equivalents.
Claims (7)
1. A high slope peninsula cable tower construction platform island building process is characterized in that a way of building island body peripheral retaining walls by stacking concrete precast blocks is adopted, the manufacturing of island body building materials at the periphery of a island, namely the concrete precast blocks, and the excavation construction of peninsula partial foundations are synchronously carried out, the stacking work of the island body peripheral retaining walls is carried out during the low tide period, meanwhile, the mountain slag stones excavated from the peninsula foundations are timely used as filling materials in cofferdams formed by the island body peripheral retaining walls, and the rapid and effective peninsula construction environment influenced by coastal semidiurnal tide is realized to form a construction platform;
the method specifically comprises the following steps:
1) constructing a main access road to form a water retaining wall;
2) prefabricating the concrete precast block on a back site, and conveying the precast block to a construction site, wherein the construction of the following steps is synchronously performed in the process; the precast block is a concrete block of 1 mmy 1 m;
3) excavating a side slope during the high tide level period, and preparing a filling material in the cofferdam;
4) stacking prefabricated blocks at set positions on the periphery of the peninsula close to the sea to form an island body peripheral retaining wall, and reserving gaps between the adjacent prefabricated blocks;
5) performing joint filling treatment on the reserved gaps among the prefabricated blocks through fine stone concrete;
6) filling the filling material in the step 3) into a cofferdam formed by the retaining wall outside the island body, and pouring fine stone concrete layer by layer;
7) after the stacking and the inner filling of the outer side retaining wall of the upstream side island are completed, the construction platform is basically formed, and the construction of the construction platform can be completed by carrying out subsequent construction.
2. The high slope peninsula cable tower construction platform island building process according to claim 1, characterized in that the construction steps of the main access road in the step 1) are as follows:
11) building stones along the shoal during the low tide level period, and simultaneously building a retaining wall on the outer side of the main sidewalk;
12) excavating a side slope nearby, and filling the inner side of the retaining wall on the outer side of the main sidewalk with the earth and stones on the inner side to exceed a high tide level to form a foundation of the main sidewalk;
13) after the construction of the main sidewalk masonry retaining wall is finished, after a layer of masonry is finished after the main sidewalk masonry retaining wall is exposed out of the water surface, fine stone concrete is poured, manual tamping is carried out, gaps among blocks of the retaining wall are densely filled, and the retaining walls on the upper layer and the lower layer are bonded into a whole layer by layer;
14) and measuring a boundary line of the construction platform, and setting out on the finished outer side retaining wall of the main pavement.
3. The high slope peninsula cable tower construction platform island building process according to claim 1, wherein the filling height in step 6) is slightly higher than the wall top of the formed precast block, so as to facilitate drainage.
4. The island building process of the high slope peninsula cable tower construction platform as claimed in claim 1, wherein in the step 4), the prefabricated blocks are piled up and staggered with tide, a measurer measures the position of the external enclosure wall of the island in real time every day as required, and the piled up prefabricated blocks are carried out layer by layer and gaps are reserved.
5. The high slope peninsula cable tower construction platform island building process according to claim 4, wherein the precast block stacking method specifically comprises the following steps: the prefabricated section is dug quick-witted successive layer sign indicating number by manual work cooperation, and the sign indicating number is the wedge and gos forward, and it is far away to build the position of advancing of island external enclosure bulkhead bottom promptly, and the upper strata reduces gradually, and the sign indicating number bottom during the low tide impels forward, and the part above the surface of water of sign indicating number rear during the high tide.
6. The high slope peninsula cable tower construction platform island building process as claimed in claim 1, wherein the precast blocks are divided into two rows of inner and outer on the plane, the joints are arranged in a staggered manner, after single-layer precast blocks are piled up, quick setting cement mortar is used for joint filling and bonding, the upper and lower precast blocks and the same precast block are quickly integrated, and the overall stability of the cofferdam is increased.
7. The high slope peninsula cable tower construction platform island building process according to claim 5, wherein a hook for fixing a crane of an excavator is fixed at the center of the top surface of the precast block.
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| CN102345300A (en) * | 2011-07-12 | 2012-02-08 | 中交四航工程研究院有限公司 | Construction method of underground structures of seacoasts and artificial islands |
| CN202899144U (en) * | 2012-08-29 | 2013-04-24 | 浙江广川建设有限公司 | Water retaining cofferdam structure |
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