阅读说明：本技术 软弱地基环境中下沉式混凝土拌合站的快速施工方法 (Quick construction method of sinking type concrete mixing station in soft foundation environment ) 是由 乔长庆 王事成 崔江 张玉宾 李圣荣 景建军 葛逢尧 于 2021-08-16 设计创作，主要内容包括：本发明提出了一种软弱地基环境中下沉式混凝土拌合站的快速施工方法,用以解决现有就地开挖浇筑混凝土建造拌合站尤其是在南方地区软基上施工时存在的施工时间长、施工效率低和施工安全性差的技术问题。本发明包括场地整平、粉罐的地基处理及基础施工、配料仓地基处理及池体施工、主机基础施工和拌和机械的吊装五步,本发明在施工前预制装配式混凝土构件,挖成基坑后采用装配式拼装技术,吊装拌合站的各个预制构件,通过浇筑的湿接缝相连接,使用预制件拼装快速浇筑和快速吊装方法提供施工效率和施工质量,使用混凝土浇筑和预制件围挡的方式保证软基上施工的安全性,保证了整体施工中建造速度快、施工更安全、模板更节省、人力更节约和作业效率更高的优点。(The invention provides a quick construction method of a sinking type concrete mixing station in a soft foundation environment, which is used for solving the technical problems of long construction time, low construction efficiency and poor construction safety existing in the existing mixing station built by excavating and pouring concrete in situ, particularly when the mixing station is constructed on a soft foundation in the south. The construction method comprises five steps of field leveling, foundation treatment and foundation construction of the powder tank, foundation treatment and tank body construction of the proportioning bin, foundation construction of a main machine and hoisting of a mixing machine.)

1. A rapid construction method of a sinking type concrete mixing station in a soft foundation environment is used for rapidly building the mixing station on a soft foundation (1), and is characterized by comprising the following steps:

s1, leveling a construction site according to the construction design;

s2, after the ground is leveled, performing powder tank foundation treatment and foundation construction, digging out a strip foundation pit, installing a protection assembly on the side wall of the foundation pit and pouring a strip foundation;

s3, after finishing powder tank foundation treatment and foundation construction, performing tank body construction of a proportioning machine, prefabricating tank body components, assembling and pouring;

s4, after the construction of the tank body of the proportioning machine is completed, the construction of the main machine foundation and the proportioning bin foundation is carried out, and the pouring construction is carried out by using the prefabricated upright column foundation;

and S5, after the construction of the main machine foundation and the proportioning bin foundation is completed, hoisting mechanical equipment for mixing concrete, and completing the construction of the mixing station.

2. The rapid construction method of a sinking concrete mixing station in a soft foundation environment according to claim 1, wherein the field leveling of the step S1 comprises the steps of:

y1, determining the elevation of a discharge hole of the stirrer and the basic elevation of mechanical equipment according to the determined elevation of field hardening, and further determining the elevation of field leveling;

y2, determining the height mark after descending according to the number of the digging parts, adopting external filling to the field, and mechanically leveling.

3. The rapid construction method of a submerged concrete mixing station in a soft foundation environment according to claim 1 or 2, characterized in that before digging out a strip-shaped foundation pit in step S2, a PHC pipe pile treatment foundation is required.

4. The rapid construction method of a sinking type concrete mixing station in a soft foundation environment according to claim 3, wherein the protection component in the step S2 comprises pine piles (2) and bamboo net sheets (3), the pine piles (2) are vertically and uniformly fixed on the edge of the strip-shaped foundation pit, the bamboo net sheets (3) are installed on the pine piles (2) and the bamboo net sheets (3) are matched with the edge of the strip-shaped foundation pit.

5. The rapid construction method of the submerged concrete mixing station in the soft foundation environment according to claim 4, characterized in that concrete is poured into a strip foundation pit to form a strip foundation, a pre-buried steel plate is installed in the strip foundation pit, and the pine pile (2) is pulled out after the pouring is completed.

6. The rapid construction method of a submerged concrete mixing station in a soft foundation environment according to claim 1, 2, 4 or 5, characterized in that the construction of the batching tank body comprises the following steps:

t1, foundation pit excavation and foundation treatment of the batching tank body;

t2, prefabricating a pool body member outside a field;

t3, hoisting the pool body member and pouring the wet joint.

7. The rapid construction method of a submerged concrete mixing station in a soft foundation environment according to claim 6, characterized in that the prefabricated pool body members comprise wall panels (4) and a first column foundation (5); in the step T3, the wall boards (4) are connected through the reserved steel bars (6) and poured to form wet joints (7), and one end of the first column foundation (5) is vertically fixed on the foundation pit.

8. The rapid construction method of a sinking type concrete mixing station in a soft foundation environment according to claim 1 or 7, wherein the prefabricated column foundation in the step S4 is a second column foundation (8), the lower part of the second column foundation (8) is provided with an elevation-adjusting steel bar (9), the second column foundation (8) is buried by using a pile burying method, and the pouring construction is performed from top to bottom by using a reverse order method.

Technical Field

The invention relates to the technical field of concrete engineering construction, in particular to a quick construction method of a sinking type concrete mixing station in a soft foundation environment.

Background

In the construction of highways, railways and large hydraulic engineering, in order to fully exert the advantages of 'centralized operation' of high equipment utilization rate, centralized management and effective quality control, China implements 'three centralized' standardized requirements in the engineering construction field, namely, each construction contract segment implements centralized concrete mixing, centralized beam piece prefabrication and centralized reinforcing steel bar processing. Construction enterprises usually build concrete mixing stations for centralized production of concrete. In construction practice, a forced double-horizontal-shaft stirrer is conventionally selected as a construction device, the forced double-horizontal-shaft stirrer is generally designed in a sinking mode, and the excavation depth of a foundation pit averagely reaches about 5 m. In the vast southern areas of China, a large amount of weak soil exists, and the sludge has high fluidity and is rich in water. The construction method comprises the following procedures of foundation pit excavation, foundation treatment, batching machine pool body cast-in-place construction, mixing mechanical foundation, mechanical hoisting and the like, and in the whole process, particularly, the pool body construction time is long, and the construction operation environment is poor, so that certain potential safety hazards exist. Meanwhile, in the construction of the early stage of the project, construction units require an urgent construction period, and the interior of the construction units requires to provide construction efficiency and accelerate the construction speed. Therefore, a construction method suitable for quickly building a mixing station on a soft foundation in the south is urgently needed.

Disclosure of Invention

The invention provides a quick construction method of a sinking type concrete mixing station in a soft foundation environment, aiming at the technical problems of long construction time, low construction efficiency and poor construction safety existing in the existing in-situ excavation concrete pouring construction mixing station, particularly when the mixing station is constructed on a soft foundation in the southern area.

In order to achieve the purpose, the technical scheme of the invention is realized as follows:

a quick construction method of a sinking type concrete mixing station in a soft foundation environment is used for quickly building the mixing station on a soft foundation and comprises the following steps:

s1, leveling a construction site according to the construction design;

s2, after the ground is leveled, performing powder tank foundation treatment and foundation construction, digging out a strip foundation pit, installing a protection assembly on the side wall of the foundation pit and pouring a strip foundation;

s3, after finishing powder tank foundation treatment and foundation construction, performing tank body construction of a proportioning machine, prefabricating tank body components, assembling and pouring;

s4, after the construction of the tank body of the proportioning machine is completed, the construction of the main machine foundation and the proportioning bin foundation is carried out, and the pouring construction is carried out by using the prefabricated upright column foundation;

and S5, after the construction of the main machine foundation and the proportioning bin foundation is completed, hoisting mechanical equipment for mixing concrete, and completing the construction of the mixing station.

Further, the field flattening in step S1 includes the steps of:

y1, determining the elevation of a discharge hole of the stirrer and the basic elevation of mechanical equipment according to the determined elevation of field hardening, and further determining the elevation of field leveling;

y2, determining the height mark after descending according to the number of the digging parts, adopting external filling to the field, and mechanically leveling.

Further, before the strip-shaped foundation pit is dug in the step S2, a PHC pipe pile treatment foundation is required.

Further, the protection component in the step S2 includes pine piles and bamboo net pieces, the pine piles are vertically and evenly fixed at the edge of the strip-shaped foundation pit, the bamboo net pieces are installed on the pine piles, and the bamboo net pieces are matched with the edge of the strip-shaped foundation pit.

Further concrete is poured into the strip foundation pit to form a strip foundation, a pre-buried steel plate is installed in the strip foundation pit, and the pine pile 2 is pulled out after pouring is completed.

Further, the construction of the batching tank body comprises the following steps:

t1, foundation pit excavation and foundation treatment of the batching tank body;

t2, prefabricating a pool body member outside a field;

t3, hoisting the pool body member and pouring the wet joint.

Further, the prefabricated pool body component comprises a wall plate and a first column foundation; in the step T3, the wall boards are connected through the reserved steel bars and poured to form a wet joint, and one end of the first column foundation is vertically fixed on the foundation pit.

Further, the prefabricated column foundation in the step S4 is a second column foundation, the height-adjusting steel bars are arranged on the lower portion of the second column foundation, the second column foundation is embedded by using a pile embedding method, and pouring construction is performed from top to bottom by using a reverse method.

The invention has the beneficial effects that:

1. the construction speed is high. The prefabricated member can be synchronously constructed with foundation pit excavation and foundation treatment in the prefabricating process, the pouring construction time is saved, and meanwhile, the prefabricated member shortens the waiting time for the strength rise of the member when mechanical equipment is hoisted.

2. The construction is safer. The invention is quicker in the construction process, and has obvious safety because the long-time construction in the foundation pit is not needed, and the prefabricated member completely forms the operation space in the construction process, thereby providing a safe operation environment for the construction.

3. Saving the construction of the template. Compared with a cast-in-place concrete tank body in a foundation pit, a large number of templates are needed, the template surfaces are mainly vertical to the horizontal plane, and the templates need large supports and cross braces. The prefabricated member can be supported on an external common field, and only a small amount of side templates are needed.

4. The labor is saved. Because a large amount of prefabricated components are adopted, the construction can be uniform, compared with the traditional construction mode, the construction method saves a steel bar worker, a scaffold worker and a template worker, and saves manpower.

5. The working efficiency is high. Compared with the traditional cast-in-place construction, the invention has the advantages that the production is not influenced by the natural environment such as severe weather, the construction period is more controllable, the working procedures are more simplified, and the production efficiency is far higher than that of the conventional operation.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a construction flow chart of the present invention.

Fig. 2 is a schematic view of the powder tank foundation pit support of the invention.

Fig. 3 is a schematic view of a prefabricated unit according to the present invention.

Fig. 4 is a schematic view of the assembly of the prefabricated parts according to the present invention.

FIG. 5 is a schematic view of the foundation column constructed by the stump burying method of the present invention.

In the figure, 1-soft foundation, 2-pine pile, 3-bamboo net sheet, 4-wallboard, 5-first column foundation, 6-reserved steel bar, 7-wet joint, 8-second column foundation and 9-heightening steel bar.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.

A rapid construction method of a sinking type concrete mixing station in a soft foundation environment, which is used for rapidly building the mixing station on a soft foundation 1, as shown in fig. 1, comprises the following steps:

s1, carry out construction site flattening according to the construction design, specifically say, at first, according to the elevation of confirmed place sclerosis, confirm the discharge gate elevation of mixer and the basic elevation of confirming mechanical equipment, and then confirm the elevation of place flattening, make mixer and mechanical equipment install the back, the discharge gate and the mechanical equipment of mixer are in the height of design, secondly, confirm the elevation after descending according to the quantity of digging, the place adopts outside filler, mechanical flattening, the soil material that outside filler used was acquireed on the spot, mechanical flattening is fast, high efficiency.

S2, after leveling the ground, performing powder tank foundation treatment and foundation construction, digging out a strip foundation pit, installing a protective component on the side wall of the foundation pit and pouring a strip foundation, specifically, firstly, using a diesel pile driver to construct a PHC (prestressed high-strength concrete) pipe pile by using a hammering method, simultaneously using a tool pile to control the penetration depth and the top elevation of the PHC pipe pile so as to ensure that the height of the PHC pipe pile meets the design requirement, secondly, using a pine pile 2 to control the outer edge of the powder tank strip foundation so as to prevent the outer edge from collapsing and returning soil, excavating the foundation pit of the strip foundation, mounting a bamboo net sheet 3 on the pine pile 2 and matching the bamboo net sheet 3 with the edge of the strip foundation pit, protecting the edge of the foundation pit, backfilling the excavated soil to the design elevation, then performing PHC pipe pile cap construction to ensure the bearing capacity requirement of the foundation, and finally, forming a soil mold by using a supporting structure consisting of the pine pile 2 and the bamboo net pieces 3 and the backfill soil body, installing an embedded steel plate, pouring a strip foundation, pulling out the pine pile 2, fixing the embedded steel plate with the bottom of the powder tank when the embedded steel plate is used for hoisting the powder tank to ensure the stability of the powder tank, and pulling out the pine pile 2 to be used next time to save resources.

S3, after finishing powder tank foundation treatment and foundation construction, constructing a batching machine for tank body construction, prefabricating tank body components and assembling and pouring, specifically, firstly, excavating a foundation pit of the batching tank body and performing foundation treatment, excavating by adopting a natural slope, the protection measure is the same as that of using a pine pile 2 for protection and using a bamboo net sheet 3 for protection in the step S2, the protection for the batching bin foundation is also treated by using a pine pile 2, a mattress layer is treated by adopting building brick slag, then pouring concrete for leveling, completing the foundation treatment, secondly, prefabricating the tank body components outside the site, as shown in figure 3, the prefabricated tank body components comprise a wall plate 4 and a first column foundation 5, wherein the wall plate 4 is divided into a slope side wall plate and a protection side wall plate, the three sides of the slope side wall plate are all provided with steel bars 6, the two sides of the protection side wall plate are provided with the steel bars 6, and finally, hoisting and pouring the tank body components, hoist wallboard 4 to suitable position, and pour, as shown in fig. 4, be connected and pour through reserving reinforcing bar 6 between the wallboard 4 and form wet seam 7, form the wet seam of straight line between two planar wallboards 4, form the wet seam of right angle in right angle department, the vertical fixing on the foundation ditch of one end of first column basis 5, accomplish the construction of whole cell body, when hoist and mount, hoist wallboard 4 earlier and stand on the bed course of cell body, wallboard 4 is with bracing piece firm in connection, then on-the-spot pouring wet seam 7, and then accomplish the construction of whole cell body, the efficiency of construction is high.

S4, accomplish the construction back of proportioning machine cell body, carry out the construction on host computer basis and proportioning bins basis, use prefabricated stand basis to pour the construction, specifically speaking, as shown in fig. 5, prefabricated stand basis is second column basis 8, 8 lower parts on second column basis are provided with heightening reinforcing bar 9, use the pile embedding method to bury second column basis 8 underground and adopt the reverse order method from the top down to pour the construction, the top of second column basis 8 is provided with fixed knot and constructs, it is fixed to be used for being connected with the equipment of hoist and mount, heightening reinforcing bar 9 is used for adjusting the height of second column basis 8, make it satisfy the design standard, and heightening reinforcing bar 9 can also further promote the stability of second column basis 8.

And S5, after the construction of the main machine foundation and the proportioning bin foundation is completed, hoisting mechanical equipment for mixing concrete, and completing the construction of the mixing station.

It should be noted that, in other embodiments of the present invention, in step S2, local stone materials may be collected on site at the construction site to form a slab-rock concrete foundation, instead of a poured strip foundation, so as to further save materials.

It should be noted that in step S2, the construction of the powder tank strip foundation mainly depends on the implementation of the soil mold construction, wherein the construction mainly depends on cheap construction building materials in south such as the pine piles 2 and the bamboo woven net 3, and the like, and the construction building materials have both protection and soil mold materials, and meanwhile, the excavated earthwork is used for backfilling to form an integral soil mold. The requirement of the powder tank foundation is met, the difficult situation of enclosing the foundation pit and erecting a high wood template is reduced, and the requirements of speed, economy and practicability are met. In other embodiments of the present invention, other structures may be used instead of the above-described components as long as the object of the present invention is achieved.

It should be noted that in step S3, the prefabricated parts of this embodiment can save form, and the vertical wall and the double-sided form in the conventional construction have large area and are not easy to support. The method adopts prefabrication, utilizes a common field to be slightly leveled, and can finish pouring by erecting a small amount of small templates, so that the pouring is safe and reliable.

It is worth mentioning that in step S3, the pool body members are prefabricated and then assembled, and the support members are utilized to quickly form the external enclosure of the foundation pit. The prefabricated parts are then joined together using wet joints 7. Wherein wet seam 7 mainly utilizes former prefab to reserve the arc reinforcing bar and reserve reinforcing bar 6 promptly, and crisscross each other forms comparatively strong connecting piece, utilizes the template to form wet seam 7 after concreting and is a firm reliable whole. The vertical formwork is simple, the number is small, the construction speed is high, the construction strength is low, and the key is construction safety.

It should be noted that, in the present embodiment, the first column base 5 in step S3 and the second column base 8 in step S4 have the same structure, and in other embodiments of the present invention, the first column base 5 may be replaced by other structures as long as the object of the present invention is achieved.

It should be noted that, in step S4, the column foundation is a prefabricated member, the second column foundation 8 is directly embedded by the stump embedding method, the construction process is reverse from the top to the bottom, the number of construction steps is small, and the speed is high.

It is worth noting that the construction of the 2HZS180 type mixing station is carried out by using the method of the embodiment, the method can be applied to the construction of all mixing stations of the HZS type series, the speed is improved by more than 50% compared with the traditional construction method, and each device is stable in structure and high in safety after being hoisted and fixed.

It should be noted that fig. 2 to 5 of the present invention only represent the connection relationship and the position relationship between the respective components, and do not represent the size ratio relationship between the respective components.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.