阅读说明：本技术 大角度混凝土浇筑方法 (Large-angle concrete pouring method ) 是由 孙久存 李师伟 马博 侯耀文 索平平 李志红 程海风 张全鹏 李永慧 王俊 赵凯 于 2019-09-11 设计创作，主要内容包括：本方法提供一种大角度混凝土浇筑方法,对底板和其上方的挡墙和楼梯进行施工,包括下列步骤：S1：对底板区域测量放线,确定所述区域的覆盖界线；S2：底板区域内进行基槽开挖,砸夯基槽内的地基,以便填充浇筑混凝土；S3：底板周围采用底板模板加固；S4：浇筑混凝土,直至下半部分填充满；S5：下半部分的混凝土成型后,上半部分在浇筑挡墙、楼梯时一体施工；S6：挡墙区域采用挡墙模板加固,上表面加设间隔布置的盖板；S7：浇筑混凝土,并在盖板间采用振动器进行振捣；S8：浇筑楼梯。在大角度混凝土浇筑时由于混凝土的流动性,大角度混凝土浇筑方法通过盖板设计加快施工进度,混凝土施工完成后质量较好,施工操作方便,经济性较好。(The method provides a large-angle concrete pouring method for constructing a bottom plate, a retaining wall above the bottom plate and a stair, and comprises the following steps of: s1: measuring and paying off a bottom plate area, and determining a coverage boundary line of the area; s2: excavating a foundation trench in the bottom plate area, tamping a foundation in the foundation trench so as to fill and pour concrete; s3: the periphery of the bottom plate is reinforced by a bottom plate template; s4: pouring concrete until the lower half part is filled; s5: after the concrete of the lower half part is formed, the upper half part is integrally constructed when a retaining wall and a stair are poured; s6: the retaining wall area is reinforced by a retaining wall template, and cover plates arranged at intervals are additionally arranged on the upper surface of the retaining wall area; s7: pouring concrete, and vibrating by adopting a vibrator between the cover plates; s8: and (6) pouring the stairs. Due to the flowability of concrete during the large-angle concrete pouring, the construction progress of the large-angle concrete pouring method is accelerated through the cover plate design, the quality of the concrete after the concrete construction is finished is good, the construction operation is convenient, and the economical efficiency is good.)

1. A large-angle concrete pouring method is used for constructing a bottom plate, a retaining wall and a stair above the bottom plate, wherein the bottom plate is divided into an upper half part and a lower half part with included angles, two ends of the retaining wall respectively extend to two sides of the bottom plate, the stair is built at the upper half part close to the retaining wall, two ends of the stair correspond to two ends of the upper half part, and the pouring method comprises the following steps:

s1: measuring and paying off a bottom plate area, and determining a coverage boundary line of the area;

s2: excavating a foundation trench in the bottom plate area, excavating an upper half part and a lower half part, tamping the foundation in the foundation trench so as to fill and pour concrete;

s3: the periphery of the bottom plate is reinforced by a bottom plate template;

s4: pouring concrete until the lower half part is filled;

s5: after the concrete of the lower half part is formed, the upper half part is integrally constructed when a retaining wall and a stair are poured;

s6: the retaining wall area is reinforced by a retaining wall template, and cover plates arranged at intervals are additionally arranged on the upper surface of the retaining wall area;

s7: pouring concrete, and vibrating by adopting a vibrator between the cover plates;

s8: and (6) pouring the stairs.

2. The high angle concrete casting method of claim 1, wherein: in step S2, when the excavation reaches a position 30cm away from the designed elevation, manual soil cleaning is adopted.

3. The high angle concrete casting method of claim 1, wherein: in step S3, the bottom plate formwork includes a wood-cement composite plate surrounding the bottom plate area, wood ridges are used for transverse reinforcement outside the wood-cement composite plate, a single longitudinal steel pipe is used for longitudinal reinforcement, an upper padding plate and a lower padding plate are respectively arranged between the upper end and the lower end of the single longitudinal steel pipe and the wood-cement composite plate, and the single transverse steel pipe is used for tensioning and fixing above the single longitudinal steel pipe.

4. The high angle concrete casting method of claim 1, wherein: in step S6, the retaining wall formwork includes a wood-cement composite board, a base plate, a reinforcing plate, and two rows of steel pipes, the wood-cement composite board surrounds the retaining wall area, the outer side of the wood-cement composite board is fixed by the reinforcing plate and the two rows of steel pipes in sequence, and an upper base plate and a lower base plate are respectively arranged between the upper end and the lower end of the two rows of steel pipes and the wood-cement composite board.

5. The high angle concrete casting method of claim 4, wherein: the upper part of the cover plate is pressed and limited by a horizontal steel pipe fixedly connected with the double-row steel pipe, and the height of the horizontal steel pipe sequentially rises along the set height of the retaining wall.

6. The high angle concrete casting method of claim 1, wherein: in step S7, cover boards with specification of 500 × 600 are processed on site before concrete pouring, distances are measured in advance, every two cover boards are laid in advance, when concrete is poured, vibration is started when the top of each cover board is poured, after vibration is completed, a next cover board is added, reinforcement is performed simultaneously, the reinforcement is placed on the top of each cover board by using processed wood ridges, then steel pipes with the length of 1m are pulled to steel pipes on the outer side of the formwork, and the process is repeated until pouring is completed.

7. The high angle concrete casting method of claim 1, wherein: in step S8, when pouring stair board concrete, according to the construction sequence from bottom to top, the concrete can not directly wash into the template, a baffle is arranged in front of the pump pipe orifice by using a wood board, and then the concrete falls to the pouring point; the pouring height of each time is not more than 0.5m, concrete with better workability is selected during pouring, the feeding points of the concrete at the stairs are distributed, and horizontal lines and vertical lines are reserved for continuous construction joints.

8. The high angle concrete casting method of claim 1, wherein: before the concrete is pressurized and fed by the delivery pump, the cement mortar lubrication pipeline with the same concrete strength grade is pressed.

9. The high angle concrete casting method of claim 8, wherein: the concrete curing is carried out by a specially-assigned person, the watering curing is carried out within 12h during normal-temperature construction, the watering curing is not less than 3 days and nights, and the watering frequency is required to keep the concrete in a wet state; the concrete can be disassembled when the strength of the concrete reaches 1.2MPa at normal temperature, the corners are trimmed, the laitance and the scum at the upper opening are chiseled and chiseled, and the laitance and the scum at the construction joint are washed clean by water.

10. The high angle concrete casting method of claim 8, wherein: in step S5, the upper half is cast and formed by the way of wall casting, and then the wall and the stairs are cast.

Technical Field

The method relates to a concrete construction method, in particular to a large-angle concrete pouring method applied to a concrete retaining wall with a larger angle in a water outlet gate of a stagnant flood area.

Background

To the concrete placement of retaining wall and bottom plate structure of impoundment area water-out floodgate side, adopt wide-angle concrete construction operation (the bottom plate divide into first half and latter half, and the contained angle between the two parts is 34, and the top of bottom plate is the retaining wall, and the both ends of retaining wall extend to the both sides of bottom plate respectively, and the contained angle of retaining wall and latter half is 18 °), and the construction operation angle is big. The structure of the chamber of the water outlet gate is completed, after the peripheral part is backfilled, the water outlet gate can be observed and maintained in real time for better ensuring the normal operation of the water outlet gate, and stairs can be designed and constructed on the side of the gate.

And (4) pouring the large-angle concrete, and completing the construction task under the condition of being influenced by the designed structure and the performance of the concrete. During construction:

1. paving a wood template on the bottom layer of the sloping roof, and binding steel bars; 2. a plurality of groups of guide rails which are arranged along the direction from the slope bottom to the slope top and are composed of two channel steel with opposite openings are sequentially fixed from the left end to the right end of the bottom-layer wood formwork, the distance between the two channel steel is not more than 2.5m, the two adjacent groups of guide rails are arranged without a space, the channel steel is connected with the bottom-layer wood formwork through a water stop screw rod, a gap is reserved between the channel steel and the bottom-layer wood formwork, and the size of the gap is the same as the thickness of concrete to be poured; 3. installing steel templates in a guide rail formed by each group of channel steel, wherein the steel templates are all provided with vibrators and are arranged at one end of the slope bottom corresponding to the track; 4. hoisting devices are arranged on the roof above each group of guide rails and used for driving the corresponding steel templates to slide along the guide rails; 5. pouring concrete between two channel steels of each group of guide rails, wherein the pouring is sequentially carried out from bottom to top, the concrete is vibrated by a small vibrating rod while being discharged, and meanwhile, a vibrator is started; 6. starting a hoisting device to drive the steel template to slide upwards 10-20 min after the concrete is poured, and sliding upwards 30-40 cm in the oblique direction of the roof each time; 7. after sliding up the steel template, carrying out secondary grinding treatment; 8. removing the guide rail, the steel template, the vibrator and the hoisting device after pouring is finished, and trowelling the concrete below the removed guide rail; 9. and (4) sequentially installing the guide rail, the steel template, the vibrator and the hoisting device which are dismantled in the step (8) to the right side of the rightmost guide rail according to the steps (2-4) until the bottom layer wood template on the whole roof is covered, and repeating the steps (5-8) after the installation is finished.

Thus, the construction process is complicated and the cost is high.

Disclosure of Invention

The method provides a large-angle concrete pouring method, the construction environment is suitable for a concrete retaining wall with a large water outlet gate angle in a stagnant flood area, the utilized templates are universal, and the concrete retaining wall can be processed according to actual conditions on site. The invention solves the problem that the construction progress and the construction quality are influenced by the characteristics (fluidity) of concrete when a plain concrete structure with a larger angle is poured, and the technical scheme is as follows:

a large-angle concrete pouring method is used for constructing a bottom plate, a retaining wall and a stair above the bottom plate, wherein the bottom plate is divided into an upper half part and a lower half part with included angles, two ends of the retaining wall respectively extend to two sides of the bottom plate, the stair is built at the upper half part close to the retaining wall, two ends of the stair correspond to two ends of the upper half part, and the pouring method comprises the following steps:

s1: measuring and paying off a bottom plate area, and determining a coverage boundary line of the area;

s2: excavating a foundation trench in the bottom plate area, excavating an upper half part and a lower half part, tamping the foundation in the foundation trench so as to fill and pour concrete;

s3: the periphery of the bottom plate is reinforced by a bottom plate template;

s4: pouring concrete until the lower half part is filled;

s5: after the concrete of the lower half part is formed, the upper half part is integrally constructed when a retaining wall and a stair are poured;

s6: the retaining wall area is reinforced by a retaining wall template, and cover plates arranged at intervals are additionally arranged on the upper surface of the retaining wall area;

s7: pouring concrete, and vibrating by adopting a vibrator between the cover plates;

s8: and (6) pouring the stairs.

Further, in step S2, when the excavation is performed to a position 30cm from the design elevation, manual soil cleaning is performed.

Further, in step S3, the bottom plate formwork includes a wood-cement composite plate surrounding the bottom plate area, wood ridges are adopted on the outer side of the wood-cement composite plate for transverse reinforcement, a single longitudinal steel pipe is adopted for longitudinal reinforcement, an upper padding plate and a lower padding plate are respectively arranged between the upper end and the lower end of the single longitudinal steel pipe and the wood-cement composite plate, and the single transverse steel pipe is tensioned and fixed above the single longitudinal steel pipe. .

Further, in step S6, the retaining wall formwork includes a wood-cement composite board, a base plate, a reinforcing plate, and two rows of steel pipes, the wood-cement composite board surrounds the retaining wall area, the outer side of the wood-cement composite board is fixed by the reinforcing plate and the two rows of steel pipes in sequence, and an upper base plate and a lower base plate are respectively arranged between the upper end and the lower end of the two rows of steel pipes and the wood-cement composite board.

The upper part of the cover plate is pressed and limited by a horizontal steel pipe fixedly connected with the double-row steel pipe, and the height of the horizontal steel pipe sequentially rises along the set height of the retaining wall.

Further, in step S7, cover boards with specification of 500 × 600 are processed on site before concrete pouring, distances are measured in advance, one cover board is laid in advance every other cover board, when concrete is poured, vibration is started when the top of each cover board is poured, after vibration is completed, the next cover board is added, reinforcement is performed simultaneously, the processed wood ribs are placed on the tops of the cover boards, then 1m steel pipes are pulled to the steel pipes on the outer sides of the formworks through opposite pulling, and the steps are repeated until pouring is completed.

Further, in step S8, when pouring the stair board concrete, the concrete cannot directly wash into the formwork according to the bottom-up construction sequence, a baffle is arranged in front of the pump pipe orifice by using a wood board, and then the concrete falls to the pouring point; the pouring height of each time is not more than 0.5m, concrete with better workability is selected during pouring, the feeding points of the concrete at the stairs are distributed, and horizontal lines and vertical lines are reserved for continuous construction joints.

Furthermore, before the delivery pump starts to press and deliver concrete, the cement mortar lubrication pipeline with the same concrete strength grade is pressed.

Furthermore, concrete curing is carried out by specially-assigned persons, watering and curing are carried out within 12 hours during normal-temperature construction, the watering time is not less than 3 days and nights, and the watering time can keep the concrete in a wet state; the concrete can be disassembled when the strength of the concrete reaches 1.2MPa at normal temperature, the corners are trimmed, the laitance and the scum at the upper opening are chiseled and chiseled, and the laitance and the scum at the construction joint are washed clean by water.

In addition, in step S5, after the upper half is cast and formed by the way of pouring the retaining wall, the retaining wall and the stairs are cast.

When the large-angle concrete is poured, because the fluidity of the concrete is not ideal when the concrete is poured, the pouring speed is not ideal, the construction progress is accelerated by the cover plate design, the quality of the concrete after the concrete is constructed is better, the problem is well solved, the construction operation is convenient, and the economical efficiency is better.

Drawings

Fig. 1 is a schematic structural view of the large-angle concrete cast structure;

FIG. 2 is an exploded view of the floor template arrangement;

FIG. 3 is a schematic view of a portion of the exterior side of the bottom form;

FIG. 4 is a schematic partial cross-sectional view of the floor form mounting;

FIG. 5 is a partial top schematic view of the floor form mounting;

FIG. 6 is a schematic cross-sectional view of the retaining wall;

FIG. 7 is a schematic view of a portion of the cover plate above the retaining wall;

FIG. 8 is a schematic top view of a portion of the reinforcement above the cover plate;

FIG. 9 is a schematic view of a portion of the exterior side of a retaining wall formwork;

fig. 10 is a schematic flow chart of the floor in the large-angle concrete casting method.

Detailed Description

As shown in fig. 1, the large-angle concrete construction work includes the construction of the lower floor 1, and the construction of the retaining wall 3 and the stairs 2. The bottom plate 1 is divided into an upper half portion 12 and a lower half portion 11, the angle of an included angle A between the two portions is 34 degrees, a retaining wall 3 is arranged above the bottom plate 1, two ends of the retaining wall 3 extend to two sides of the bottom plate 1 respectively, the angle of an included angle B between the retaining wall 3 and the lower half portion 11 is 18 degrees, the upper half portion 12 is close to the retaining wall 3 to build a stair 2, and two ends of the stair 2 correspond to two ends of the upper half portion 12.

In actual operation, the coverage boundary of the upper half part 12 and the lower half part 11 is subject to actual conditions, and the coverage boundary in the construction of the embodiment is exemplified by a rectangle as a reference.

As shown in fig. 10, the floor construction in the large-angle concrete pouring method includes the following process flows: measuring and paying off → excavating a foundation trench → tamping → laying a template → supporting and reinforcing the template → pouring concrete → maintaining. Wherein, the construction of the retaining wall 3 and the stair 2 is also suitable for the construction of the template paving → the template supporting and reinforcing → the concrete pouring → the maintenance.

Before the construction is started, preparation works can be carried out to reduce the time of actual work and improve the efficiency, and the following is the introduction of the relevant preparation works:

1. construction preparation: and the constructor is familiar with the construction process, and reduces unnecessary time consumption during procedure handover. Before the bottom plate formwork is constructed, related construction operators are familiar with construction drawings.

2. Preparing materials for assembling the bottom plate template on site:

(1) preparing a wood-glue composite board: the bottom board template 4 is a baffle plate made of a wood-glue composite board (an artificial board made of wood chips, bamboo and straw through board pressing processing without cellulose fiber materials) with a board thickness of not less than 10mm, wherein the thickness delta in the embodiment is 12 mm. The board surface and the cut of the wood-rubber composite board need to be subjected to waterproof treatment, and the board surface needs to be uniformly coated with a release agent.

(2) Preparing wood ridges, wherein the wood ridges can be made of wood squares with the thickness of 400mm multiplied by 90mm (the length multiplied by the width multiplied by the height); the wood ridges are arranged behind the wood-rubber composite board and used for enhancing the strength of the wood-rubber composite board.

(3) A steel pipe is prepared. The wood-glue composite board is also arranged behind the wood-glue composite board and used for enhancing the strength of the wood-glue composite board. The specification of the steel pipe in this embodiment is adopted

After the preparation work is done, the construction of the bottom plate is started:

s1: measuring line

Before the bottom plate template is installed, template control lines are firstly arranged in a bottom plate area in a testing mode and used for determining a coverage boundary line. The axis is located by adopting a TOPCO total station (N211D), and the elevation and the flatness of the control line are detected by using a level gauge (DZS 3-1). After the coverage boundary line of the bottom plate is determined, the material of the template is placed on the outer side, and the thickness of the filling concrete in the area of the bottom plate is determined.

S2: excavation of foundation trench

The construction method is characterized in that mechanical excavation is adopted to construct a bottom plate area, an angle is formed between an upper half portion 12 and a lower half portion 11 along with excavation along with the slope where the bottom plate area is maintained (an angle is formed between the upper half portion and the lower half portion, a foundation trench is correspondingly formed with an angle, and the foundation trench and the ground form a slope).

S3: tamping rammer

After the foundation trench of the bottom plate region is dug, the foundation in the foundation trench needs to be tamped, and the foundation needs to be tamped to the designed bearing capacity by a tamping machine when a backfilling part exists.

S4: laying formwork

The prepared wood-glue composite board, wood ridges and steel pipes are used for the bottom board template, the wood-glue composite board is arranged around the bottom board area, as shown in figures 3, 4 and 5, and the wood-glue composite board 4 is arranged at the boundary line of the bottom board area.

The processing of the wood model can be on-site processing, each wood-glue composite board is cut according to drawings, schemes and on-site actual sizes, and the joints among the wood-glue composite boards 4 are filled with putty and then are adhered with adhesive tape paper.

S5: formwork support reinforcement

Afterwards, the wood edges 5 are adopted outside the wood-plastic composite board 4 as a transverse reinforcing board, the single longitudinal steel pipe 8 is adopted as a longitudinal reinforcing pipe, the lower end of the single longitudinal steel pipe 8 is inserted into the ground, the upper end of the single longitudinal steel pipe is higher than the wood-plastic composite board 4, and an upper padding plate 6 and a lower padding plate 7 are respectively arranged between the upper end and the lower end of the single longitudinal steel pipe 8 and the upper end and the lower end of the wood-plastic composite board 4.

And at two ends of the bottom plate area perpendicular to the concrete filling direction D, the single longitudinal steel pipe 8 is tensioned and fixed by adopting the single transverse steel pipe 9.

In order to ensure the support stability, the wood ridges 5 are uniformly arranged between the upper backing plate 6 and the lower backing plate 7, and the distance between the upper wood ridges and the lower wood ridges is 200mm in the embodiment. Similarly, the spacing distances of the single longitudinal steel pipes 8 are also uniformly arranged, and the single longitudinal steel pipes 8 can be arranged at the boundary line where the corners exist.

Meanwhile, the single longitudinal steel pipe 8 at the outer side and the single longitudinal steel pipe at the side surface of the lower half portion 11 of the wood-cement composite plate where the concrete reaches the tail end of the lower half portion 11 are tensioned and fixed through the oblique steel pipes.

S6: pouring concrete

Concrete is poured from the upper half 12 to the lower half 11, which allows the concrete to fill in the area of the floor because of the formwork support and blocking until the lower half 11 is filled.

When the lower half 11 is filled, the upper half 12 has a slope, and the concrete poured on the slope is remained.

The lower half part 11 is solidified and formed, and then the concrete pouring mode of the upper half part 12 is that the following pouring mode of the retaining wall 3 is adopted, and the pouring of the retaining wall 3 and the stair 2 is carried out after the forming; and secondly, pouring the retaining wall 3 and the stair 2 respectively, wherein the upper half part 12 below the retaining wall and the stair are integrally operated during pouring.

S7: maintaining

And after the concrete is solidified, forming the bottom plate.

When the bottom plate is poured, the pouring time is controlled due to the fact that the gradient of the bottom plate is large, the slump is properly reduced within an allowable range, and left-right segmented pouring can be conducted on the lower half portion 11.

As shown in fig. 6, the cross section of the retaining wall 3, the outer side 14, may be sloped, the inner side 13 (close to the stairs 2) is vertical, and the upper surface 10 is flat. One end of the retaining wall 3 reaches the end of the lower half 11, the other end of the retaining wall 3 starts at the head end of the upper half 12, and the height of the retaining wall 3 is the greatest at the junction between the lower half 11 and the upper half 12.

As shown in fig. 7, 8 and 9, when the retaining wall 3 is poured, the periphery of the retaining wall is also surrounded by wood-plastic composite boards, the outer sides of the wood-plastic composite boards (for saving application, the wood-plastic composite boards 4 when the bottom plate is poured are modified) are fixed by double rows of steel pipes 17, spacing wood ridges 18 (used wood ridges 5 can be adopted) are arranged between the wood-plastic composite boards and the double rows of steel pipes 17, and retaining wall upper backing plates and retaining wall lower backing plates 19 can be also adopted at the upper end and the lower end of the wood-plastic composite boards, wherein the retaining wall upper backing plates are arranged along the upper edge of the retaining wall 3 to be poured.

The angle of the retaining wall 3 is 18 degrees, the inclination is larger, because of the fluidity and inertia of concrete, if a common pouring method is adopted during pouring, the construction progress is greatly slowed down, the quality is not ensured, the pouring method is improved by combining the site construction conditions, and the problem is solved by additionally arranging a cover plate at the top of the retaining wall.

Because there is the inclination in the upper surface of barricade 3, therefore the upper surface of the concrete is injectd through the apron 20 that covers above when pouring, and apron 20 top adopts horizontal steel pipe 15 to fix, can set up vertical backing plate 16 (can adopt the stupefied 5 of wood that finishes using) between horizontal steel pipe 15 and apron 20, and the both ends of horizontal steel pipe 15 respectively with the double steel pipe 17 fixed connection of barricade 3 both sides, connect and adopt the overlap joint mode.

Wherein the double-row steel pipes 17 on one side are obliquely arranged to meet the gradient existing on the outer side 14 of the retaining wall 3, and the double-row steel pipes 17 on the other side are vertically arranged. The lower end of the double-row steel pipe 17 contacts the bottom plate or the ground and props against the outer side of the lower end of the double-row steel pipe 17 through the fixing block or the fixing rod, so that the lower end of the double-row steel pipe 17 is prevented from moving outwards when concrete is poured.

Because the cover plate 20 is arranged obliquely, the horizontal direction of the joint for connecting the horizontal steel pipe 15 and the double-row steel pipe 17 is not reserved at the same height.

In this embodiment, after the horizontal steel pipe 15 is lapped with the double row steel pipe 17, the lapping length of the horizontal steel pipe 15 is 1.0 m.

Thus, during construction, the cover plate 20 with the specification of 500 x 600 can be processed on site before concrete pouring, the distance can be measured in advance, one cover plate is laid in advance every other cover plate, when concrete is poured, vibration is started when the top of each cover plate is poured, a cover plate is additionally arranged after vibration is finished, reinforcement is simultaneously carried out, the processed wood ridge is placed on the top of the cover plate for reinforcement, then a horizontal steel pipe 15 with the length of 1m is used for oppositely pulling the two rows of steel pipes 17 on the outer side of the formwork, and the process is repeated until pouring is finished.

When the concrete is poured and vibrated, the concrete between the cover plates 20 is vibrated by the vibrating rods 21. The vibrating spears 21 are staggered and ordered, are inserted quickly and pulled slowly, do not leak vibration, but do not vibrate, the moving distance of each time is not more than 1.5 times of the acting radius of the vibrating spears, and the vibration time is controlled to be 20-30 seconds. At the concrete interface with interval time difference, in order to combine the upper and lower concrete into a whole, the vibrator is extended into the lower concrete by 5cm, and the vibration at the joint and the bottom of the structure is particularly strengthened, so as to ensure that the concrete has no bad phenomena of root rot, honeycomb, pitted surface and the like.

The pouring of the retaining wall 3 can be performed in the manner of pouring the upper half part 12 of the bottom plate, and if the retaining wall 3 is poured integrally, the lower ends of the wood-plastic composite plate and the steel pipe on the outer side of the retaining wall 3 start from the lower end of the upper half part 12.

Furthermore, when the wood-rubber composite board is constructed, the sealing adhesive tape is adhered to the inner side of the joint of the adjacent wood-rubber composite boards, and the sponge strips are adhered to the outer side of the joint to prevent the slurry leakage from generating holes. The surface of the wood-glue composite board can be coated with a separant, and the wood-glue composite board is not watered to be wet after being coated with the separant, so that accumulated water on the wood-glue composite board after watering is prevented from generating a honeycomb pitted surface on the surface of concrete after pouring.

The processing of the template in the invention is on-site processing, each wood-rubber composite board is cut according to drawings, schemes and on-site actual sizes, and the joints of the wood-rubber composite boards are filled with putty and then are adhered with adhesive tape paper. A lower cushion plate is additionally arranged at the lower end between the steel pipe and the wood-rubber composite board.

Meanwhile, the single longitudinal steel pipe 8 and the single transverse steel pipe 9 of the bottom plate template, and the double-row steel pipe 17 and the horizontal steel pipe 15 of the retaining wall template are firmly hooped and tightly propped with the adjacent parts by using steel pipe fasteners. The space between the adjacent single longitudinal steel pipes 8 or the adjacent double rows of steel pipes 17 is strictly controlled, and the space in the embodiment is 800 mm.

And when the concrete is poured, the discharging thickness and the pouring direction are controlled, and the material is uniformly distributed. During operation, a specially-assigned person can be arranged to patrol the stress condition of the template outside the operation area, and abnormal conditions are found and timely reported for processing. Avoid quality and safety accidents.

And finally, when the concrete of the stair board is poured, the construction sequence is from bottom to top. The concrete can not be directly flushed into the template, a baffle plate is arranged in front of the pump pipe orifice by using a wood plate, and then the concrete falls to a pouring point. The pouring height of each time is not more than 0.5m, concrete with better workability is selected during pouring, the feeding points of the concrete at the stairs 2 are distributed, and horizontal lines and vertical lines are reserved for continuous construction joints. Until the stair 2 is constructed.

In addition, the present invention also needs to do the following work:

before the concrete is pressurized and fed by the delivery pump, the cement mortar lubrication pipeline with the same concrete strength grade is pressed. The impact force of the distributing equipment is large, and the distributing equipment cannot collide or be directly placed on the template. Concrete curing and form removal: the concrete curing is carried out by specially-assigned persons, the watering curing is carried out within 12h during normal-temperature construction, the watering curing is not less than 3 days and nights, and the watering frequency is required to keep the concrete in a wet state. And (3) when the strength of the concrete reaches 1.2MPa at normal temperature, the concrete can be disassembled after supervision and approval, workers can be organized in time to trim corners, the laitance and the scum at the upper opening are chiseled, the laitance and the scum of the construction joint are chiseled, and the concrete is washed clean by water.

Safe bottom-crossing work is well done before concrete pouring and tamping; leakage protection is required to be arranged for all mechanical equipment; all electromechanical equipment need to be tested according to the regulations and put into use after being normal. And checking whether the field working platform and the chute are firm or not, and clearing the obstacles to ensure normal use. The site safety and the electricity utilization arrangement are specially assigned for duty. Enough illumination is provided on the site, and power and illumination wires need to be buried or special electric poles need to be arranged in an overhead manner. The vibrator operator wears an insulating boot and gloves.

Because the fluidity of the concrete is not ideal when the large-angle concrete is poured, the pouring speed or speed is not ideal, the construction progress is accelerated by the cover plate design, the quality of the concrete after the construction is finished is better, and the problem is well solved. And the construction operation is convenient, and the economy is better.