阅读说明：本技术 防沙底坎浇筑方法 (Sand prevention sill pouring method ) 是由 张建 李师伟 马博 侯耀文 赵志峰 索平平 葛凤凯 张全鹏 李勇慧 薛胜圣 杲胜 于 2019-10-16 设计创作，主要内容包括：本发明提供一种防沙底坎浇筑方法,包括下列步骤：(1)对于待施工沙底坎进行前期水下勘察,测量水下数据以及确定底坎尺寸,并对模板安装位置进行测量定位；(2)向施工地点运送设备、材料,检验用量以及种类是否齐全；(3)在陆地完成底坎钢模板制作,底坎钢模板分为前后两块模板,截面呈梯形,两块模板间预留三个浇筑孔；(4)通过汽车吊进行模板吊装,放置模板到水下相应位置；(5)模板水下调整并焊接；(6)水下混凝土浇筑是采用钢导管进行浇筑,浇筑前进行闭水试验；(7)利用汽车吊配合安装导管；(8)浇筑混凝土。防沙底坎浇筑方法在水深50米范围内的深水作业能够实现混凝土的浇筑,解决能见度低、施工条件差、作业面小的问题。(The invention provides a sand-proof sill pouring method, which comprises the following steps: (1) carrying out early-stage underwater exploration on the sand sill to be constructed, measuring underwater data, determining the size of the sill, and measuring and positioning the installation position of the template; (2) conveying equipment and materials to a construction site, and checking whether the use amount and the variety are complete; (3) finishing the manufacture of a bottom ridge steel template on land, wherein the bottom ridge steel template is divided into a front template and a rear template, the cross section of the bottom ridge steel template is trapezoidal, and three pouring holes are reserved between the two templates; (4) hoisting the template through a truck crane, and placing the template to a corresponding position underwater; (5) adjusting and welding the template underwater; (6) the underwater concrete pouring is to pour by adopting a steel conduit, and a water closing test is carried out before pouring; (7) a guide pipe is installed by utilizing the matching of a truck crane; (8) and (5) pouring concrete. The sand-proof sill pouring method can realize concrete pouring in deep water operation within the water depth range of 50m, and solves the problems of low visibility, poor construction conditions and small operation surface.)

1. A sand-proof sill pouring method comprises the following steps:

(1) carrying out early-stage underwater exploration on the sand sill to be constructed, exploring the landform and landform, measuring underwater data, determining the size of the sill, and measuring and positioning the installation position of the template;

(2) conveying equipment and materials to a construction site, and inspecting the equipment and the materials in the field to check whether the use amount and the variety are complete or not;

(3) manufacturing a bottom ridge steel template on land, wherein the bottom ridge steel template is divided into a front template and a rear template, the cross sections of the front template and the rear template are trapezoidal, and three pouring holes are reserved between the two templates;

(4) hoisting the template through a truck crane, and placing the template to a corresponding position underwater;

(5) adjusting and welding the template underwater;

(6) the underwater concrete pouring is to pour by adopting a steel conduit, and before pouring, a water closing test is carried out on the conduit;

(7) meanwhile, a guide pipe is installed by utilizing the matching of a truck crane;

(8) and (5) pouring concrete.

2. The sand prevention sill casting method according to claim 1, characterized in that: in the step (1), image data of the sand bottom sill-shaped groove is reserved during investigation.

3. The sand prevention sill casting method according to claim 1, characterized in that: in the step (3), a water inlet brake structure is encircled between the front template and the rear template, and reinforcing steel bars which are welded integrally are arranged on the surfaces of the front template and the rear template and serve as reinforcing ribs.

4. The sand prevention sill casting method according to claim 1, characterized in that: in the step (3), nuts are welded at the four corners and the centers of the front and the rear templates, lengthened bolts fixedly connected with the nuts are manufactured at the nuts, and the position of the bolts at the nuts is adjusted to achieve up-and-down adjustment of the templates.

5. The sand prevention sill casting method according to claim 1, characterized in that: in the step (4), the front steel formwork is obliquely arranged, and the rear steel formwork is vertically arranged.

6. The sand prevention sill casting method according to claim 1, characterized in that: in the step (4), the two templates are welded with the positioning devices on the back water surface, and after the templates are reinforced, the positioning devices are fastened on the main structure of the water inlet tower to prevent the steel bar templates from floating.

7. The sand prevention sill casting method according to claim 1, characterized in that: and (4) after the positions of the two templates are confirmed, a diver rotates the bolts to adjust the elevation, and the diver performs reinforcement binding between the two templates and underwater welding of the two reinforcement templates.

8. The sand prevention sill casting method according to claim 1, characterized in that: and (7) arranging two floating boats on the water surface, wherein a clamping seat for penetrating and fixing the guide pipe is arranged for installing the guide pipe.

9. The sand prevention sill casting method according to claim 1, characterized in that: in step (8), C30 pea stone concrete is used for casting.

10. The sand prevention sill casting method according to claim 1, characterized in that: and (8) pouring from the middle pouring hole, observing the pouring condition by a diver underwater and feeding back the pouring condition to the water surface command part, and pouring from the middle pouring hole to the left side and the right side through the pouring holes at the two sides.

Technical Field

The invention relates to a deep water concrete pouring method, in particular to a sand-proof sill pouring method.

Background

For the concrete underwater pouring of the sand prevention structure in front of the reservoir gate, the mountain bodies are poured twice according to the underwater topography, and the bottom of the mountain body is also of an uneven mountain body structure. During deepwater construction operation, the water depth between two sides can reach 25m-40m, the pouring operation surface is 17 m below the water surface, and the construction operation is limited.

The current reservoir is of a long time, and silt is deposited before the floodgate, for better assurance reservoir flood discharge, the drainage function builds sand prevention sill in design position before the floodgate, increases the reservoir operation age limit. The method belongs to deep water concrete pouring (the water flow speed of an underwater construction surface is low, more sediment soil and sludge exist, the structural section is approximately trapezoidal, the underwater construction adopts a reinforced concrete structure), and the construction task is difficult to complete under the condition that the working surface is limited due to the influence of the main structure of the existing reservoir.

Disclosure of Invention

The invention provides a sand-proof sill pouring method, which solves the problems of large height difference between a pouring platform and a structural surface, difficult construction and difficult quality control in the prior art, and adopts the following technical scheme:

a sand-proof sill pouring method comprises the following steps:

(1) carrying out early-stage underwater exploration on the sand sill to be constructed, exploring the landform and landform, measuring underwater data, determining the size of the sill, and measuring and positioning the installation position of the template;

(2) conveying equipment and materials to a construction site, and inspecting the equipment and the materials in the field to check whether the use amount and the variety are complete or not;

(3) manufacturing a bottom ridge steel template on land, wherein the bottom ridge steel template is divided into a front template and a rear template, the cross sections of the front template and the rear template are trapezoidal, and three pouring holes are reserved between the two templates;

(4) hoisting the template through a truck crane, and placing the template to a corresponding position underwater;

(5) adjusting and welding the template underwater;

(6) the underwater concrete pouring is to pour by adopting a steel conduit, and before pouring, a water closing test is carried out on the conduit;

(7) meanwhile, a guide pipe is installed by utilizing the matching of a truck crane;

(8) and (5) pouring concrete.

In the step (1), image data of the sand bottom sill-shaped groove is reserved during investigation.

In the step (3), a water inlet brake structure is encircled between the front template and the rear template, and reinforcing steel bars which are welded integrally are arranged on the surfaces of the front template and the rear template and serve as reinforcing ribs.

In the step (3), nuts are welded at the four corners and the centers of the front and the rear templates, lengthened bolts fixedly connected with the nuts are manufactured at the nuts, and the position of the bolts at the nuts is adjusted to achieve up-and-down adjustment of the templates.

In the step (4), the front steel formwork is obliquely arranged, and the rear steel formwork is vertically arranged.

In the step (4), the two templates are welded with the positioning devices on the back water surface, and after the templates are reinforced, the positioning devices are fastened on the main structure of the water inlet tower to prevent the steel bar templates from floating.

And (4) after the positions of the two templates are confirmed, a diver rotates the bolts to adjust the elevation, and the diver performs reinforcement binding between the two templates and underwater welding of the two reinforcement templates.

And (7) arranging two floating boats on the water surface, wherein a clamping seat for penetrating and fixing the guide pipe is arranged for installing the guide pipe.

In step (8), C30 pea stone concrete is used for casting.

And (8) pouring from the middle pouring hole, observing the pouring condition by a diver underwater and feeding back the pouring condition to the water surface command part, and pouring from the middle pouring hole to the left side and the right side through the pouring holes at the two sides.

The sand-proof sill pouring method is different from the existing underwater pouring technology in that the concrete pouring can be realized in the deep water operation within the water depth of 50m, the problems of low visibility, poor construction conditions and small operation surface are solved, and the adjustability of the template is the characteristic and innovation of the invention.

Drawings

Fig. 1 is a schematic flow chart of the steps of the sand-proof sill casting method;

FIG. 2 is a cross-sectional view of the template;

fig. 3 is a top view of the template.

Detailed Description

The invention provides a sand prevention sill pouring method, and in a pouring construction scheme of an engineering water inlet tower sand prevention sill in a certain embodiment, a water bottom elevation 442, a water surface elevation 475 and a water inlet tower working bridge elevation 492 are adopted. The diver in the field can explore the landform and leave the image data. Because of being influenced by water flow, the underwater measuring tool (a level bar and a linear scale) can be manufactured, underwater data can be repeatedly measured, and the size of the sill can be finally determined.

As shown in figure 1, after the early-stage underwater exploration and measurement and positioning are carried out, equipment and materials can be conveyed to a construction site, the equipment and the materials need to be checked in the field, and the use amount and the types of the equipment and the materials are checked to be complete.

The fabrication of the sill steel form 1 can be completed on land, and the steel form is adopted for a permanent building according to design requirements. Because of the size of foundation ditch under water receives rivers to influence, and the measuring size has not reached accurate yet, so make into the controllability with steel form 1, two blocks around steel form 1 falls into, and the floodgate structure is intake to the centre surroundingly. Wherein, the front refers to the upstream surface and the rear refers to the backside surface. The surface of the steel template 1 is also provided with welded integrated steel bars serving as reinforcing ribs to realize the strength of the template and reduce deformation, so that the steel template can also be regarded as a steel bar template. And after the sill steel template 1 is processed on land, subsequently performing underwater adjustment and installation, steel bar binding and template underwater welding. The invention adopts front and back templates, and the templates are not considered at two sides and the bottom. The underwater structure is complex, so that the underwater splicing mode of the two steel bar templates is adopted for installation, and the adjustment is convenient.

As shown in figures 2 and 3, the front steel formwork is obliquely arranged, the rear steel formwork is vertically arranged, and the cross sections of the two steel formworks are trapezoidal. The nut has all been welded at the four corners and the center of every steel form, and nut department self-control has fixed connection's extension bolt (only relates to screw nut, has the deviation if there is the reinforcing bar in hoist and mount installation, can't adjust in the template outside, can adjust through screw jack-up or decline between two templates), and rotatable bolt is adjusted when the template needs adjust from top to bottom, realizes the vertical adjustment of every template.

In the manufacturing process of the steel bar formwork, the positioning devices are welded on the back surface of the two formworks, and the effect of stable positioning is achieved in the process of installing the formworks underwater. After the steel bar formwork is manufactured, three circular pouring holes 2 are reserved in the top.

Then, template hoisting operation is carried out, the steel bar templates are adjusted and installed underwater, two 25t truck cranes can work in a matching way, one steel bar template is installed on the right side, a positioning device is used for submerging to 33m underwater according to the designed elevation position, a diver wears professional diving equipment and underwater camera equipment to confirm the underwater condition, and the underwater interphone reports the condition; and after the first block determines the underwater approximate position, launching the second steel bar formwork, and the construction steps are the same as those of the first block. After the two templates confirm the positions, the diver rotates the bolts to adjust the elevation, and then the diver performs reinforcement binding between the two templates and underwater welding of the two reinforcement templates. After the completion, the steel formwork is reinforced all around, and the positioning device is further fastened on the main structure of the water inlet tower to prevent the steel formwork from floating.

After the underwater bottom sill is poured, the two templates do not need to be dismantled, and the bottom of the bottom sill steel template 1 is processed by planting bars at the position of the water bottom 3. If the effect needs to be improved, bottom cleaning and slurry changing can be carried out in advance.

The underwater concrete pouring is performed by adopting a steel guide pipe, the diameter of the guide pipe is about 250-300 mm (not less than 8 times of the maximum aggregate particle size), each section is 3m long, the guide pipe is connected by a quick connector, and a funnel is arranged at the top of the guide pipe.

The water closing test is carried out on the guide pipe before pouring, the concrete adopts pea stone concrete (with good fluidity), pouring equipment adopts a ground pump to pour (influenced by a field operation surface, a pump truck cannot be used), the guide pipe is respectively provided with 4 sections on land and is lifted by a crane, two floating boats are arranged on the water surface, and the guide pipe is provided with clamping seats (the clamping seats are square grooves welded by steel plates and used for fixing the guide pipe) to facilitate the installation of the guide pipe. Pouring is started between the two templates after the installation is finished, C30 pea gravel concrete (aggregate is small pebbles with the particle size of 5-12 mm, the surface is smooth, and the good fluidity is achieved) is used for pouring to the left side and the right side of the templates, and a diver observes the pouring condition underwater and feeds back to the water surface command part. And after the pouring of the middle pouring hole is finished, the left side and the right side are poured through the pouring holes at the two sides, and the construction method is the same as the middle hole pouring method. After pouring is finished, a diver takes a self-made level ruler to wipe the surface, and regular observation and maintenance are carried out.

The invention accumulates experience when concrete is poured in the reservoir with the water depth of 33 m; the damage of silt to the water inlet tower is blocked, so that the operation life of the reservoir is prolonged.