CN112727218A

CN112727218A - Assembly construction method for pit straight wall

Info

Publication number: CN112727218A
Application number: CN202011561051.3A
Authority: CN
Inventors: 吴龙镇; 唐光鹏; 滕毅; 周其胜; 张天福
Original assignee: China MCC20 Group Corp Ltd; Shanghai Ershiye Construction Co Ltd
Current assignee: China MCC20 Group Corp Ltd; Shanghai Ershiye Construction Co Ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2021-04-30

Abstract

The invention relates to an assembly construction method of a pit straight wall, which breaks up the whole prefabricated wall plate into parts by decomposing a pit straight wall, and avoids the phenomena of mould expansion and material waste of the mould in the prior art by installing the prefabricated wall plate in blocks from zero to the whole during construction, thereby being beneficial to reducing the cost; the concrete prefabricated wall board is prefabricated on site, can be stored in advance, and is beneficial to improving the construction efficiency and shortening the construction period; the prefabricated wallboard template has the advantages that the prefabricated wallboard template replaces the traditional template, is light in weight, good in compactness, convenient to connect and easy to process nodes, is beneficial to forming a complete wall body, and is not easy to loosen and crack due to the fact that concrete is poured; the precast concrete wallboard forms complete template system, through the relation of connection between adjustment wallboard and the wallboard, satisfies wallboard overall structure's stability and intensity requirement, and the precast wallboard is installed together about more accurate messenger, and difficult emergence deviation has beaten the basis for subsequent straight wall construction.

Description

Assembly construction method for pit straight wall

Technical Field

The invention relates to the technical field of pit construction, in particular to an assembled construction method for a pit straight wall.

Background

The construction method is characterized in that a cast-in-place concrete straight wall is commonly adopted as a protective layer on the periphery of a pit due to process requirements after the construction of the pit of the brewing factory building, a ubiquitous problem is found in the construction of the pit construction straight wall in recent years, the space of a foundation pit is limited after the construction of the pit or the pit is locally influenced by a factory building foundation, the construction of the cast-in-place concrete straight wall template is difficult, the conditions of template blasting, poor flatness of a wall surface of a straight wall and the like during concrete pouring are caused, the construction foundation such as the quality control of the straight wall is poor, and meanwhile, the backfill of the pit foundation pit is influenced by the fact that the template cannot be disassembled in a short period due to the requirement of the technical performance of the concrete, so that the construction process needs to be improved in the aspects of saving materials and shortening the construction period, and the construction efficiency needs to be improved, and the research of the pit straight wall construction method.

Disclosure of Invention

The invention aims to solve the technical problem of providing an assembled construction method for a pit straight wall, which has the advantages of simple steps, reasonable design, convenient implementation, good use effect, simple, convenient, efficient and high-quality construction of the pit concrete straight wall, capability of ensuring the rapid backfilling of pit foundation pits, elimination of potential safety hazards in advance, and effective solution of the problems of high construction difficulty and labor and material loss in a limited space.

The technical scheme adopted by the invention for solving the technical problems is as follows: the assembling construction method for the pit straight wall is characterized by comprising the following specific operation steps of:

step 1, manufacturing a prefabricated wallboard template: the thickness H of the prefabricated wallboard is 100mm, the template is a combined template frame, the combined template frame is divided into an upper rectangular template frame and a lower rectangular template frame, the size of the combined template frame is 1000mm multiplied by 1500mm, three splicing positions of the side end of the prefabricated wallboard are made into L-shaped notches for staggered splicing, the steel bars are arranged into single-layer bidirectional steel bars, the periphery of the prefabricated wallboard surface close to one side of the pit stone wall is embedded with inner supporting split heads, and the height H of the inner supporting split heads exposed out of the concrete surface is 100 mm;

step 2, prefabricating the concrete wallboard on site: combining the upper and lower layers of rectangular template frames and the steel bars manufactured in the step 1 into a prefabricated wallboard, arranging single-layer bidirectional steel bars and pre-embedded steel bars of an inner support split heads, pouring concrete, removing the template after the strength reaches the standard, and finishing the manufacturing of a concrete prefabricated wallboard finished product;

step 3, mounting the precast concrete wall panel: hoisting finished precast concrete wallboards to the flat part of the periphery of the pit for stacking, after the construction of pit cushion concrete positioning steel bars is completed, sequentially assembling the wallboards from bottom to top by the precast concrete wallboards from one end of the bottom of the pit, performing joint filling treatment on waterproof mortar at the L-shaped cut, performing joint staggering assembly on a second layer of precast wallboard, performing joint staggering assembly construction according to the method until the designed height mark of the pit straight wall is reached, and entering the next process after the assembly of the whole wallboard is completed;

and 4, backfilling pit foundation pits of the pit to 200mm below the surface elevation on the precast concrete wallboard in a layered mode, pouring concrete on the straight wall, and backfilling the pit foundation pits in a layered mode to the designed elevation when the strength of the concrete reaches 1.2 MPa.

As a supplement to the technical scheme of the invention, in the step 2, the formwork is removed after the concrete strength reaches 75% of the design strength, the prefabricated wall panel is stacked in a concentrated manner, and the prefabricated wall panel can be installed after the concrete strength reaches 100%.

As a supplement to the technical scheme of the invention, in the step 4, before the prefabricated wall panel is backfilled outside, gaps between the bottom of the straight wall and the wall surface need to be tightly sealed, and a top support is arranged inside the pit, so that the deformation of the pit caused by the side pressure of the backfilled soil is avoided.

Has the advantages that: the invention relates to an assembled construction method for a pit straight wall, which has the following advantages:

firstly, the prefabricated wall boards are broken into parts by decomposing the pit straight wall, and the prefabricated wall boards are installed in blocks from zero to complete during construction, so that the phenomena of die expansion and material waste of the die boards in the prior art can be avoided, and the cost is reduced; the concrete prefabricated wall board is prefabricated on site, can be stored in advance, and is beneficial to improving the construction efficiency and shortening the construction period;

secondly, the prefabricated wallboard template replaces a traditional template, is light in weight, good in compactness, convenient to connect and easy to process nodes, is beneficial to forming a complete wall body, and is not easy to loosen and crack due to the fact that concrete is poured;

thirdly, the precast concrete wallboard forms complete template system, through the relation of connection between adjustment wallboard and the wallboard, satisfies wallboard overall structure's stability and intensity requirement, and the precast concrete wallboard is installed together about more accurate messenger, and difficult the deviation that takes place makes the connection of a plurality of precast concrete wallboards more firm, has avoided the template to demolish, the material loss, has laid the basis for subsequent wall construction that goes straight.

Drawings

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

FIG. 2 is a schematic structural view of a prefabricated wall panel form of the present invention;

FIG. 3 is a schematic structural view of a precast concrete wall panel according to the present invention;

FIG. 4 is a schematic perspective view illustrating the installation of the precast concrete wall panel according to the present invention;

fig. 5 is a cross-sectional view taken in the direction of fig. 4B-B of the present invention.

The figure is as follows: 1. precast concrete wallboard, 2, L type kerf, 3, internal stay split heads reinforcing bar, 4, the two-way reinforcing bar of individual layer, 5, composite formwork frame.

Detailed Description

The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.

In this embodiment, the lengths of the straight walls are 30m, 42m and 50m, the height of the straight wall is 3m, the minimum distance between the outer vertical surface of the straight wall and the pile foundation is only 100mm, the operation space is narrow and small, the construction difficulty is high, in order to solve the above construction problems, the embodiment adopts a pit straight wall assembly construction method, as shown in fig. 1 to 5, the specific operation steps are as follows:

step 1, manufacturing a prefabricated wallboard template: as shown in fig. 2, the thickness H of the prefabricated wall panel is 100mm, the template is a combined template frame 5, the combined template frame 5 is divided into an upper rectangular template frame and a lower rectangular template frame, the a × b size is 1000mm × 1500mm, three splicing positions of the side end of the prefabricated wall panel are made into L-shaped kerfs 2 for staggered splicing, the steel bars are arranged into single-layer bidirectional steel bars 4, the inner supporting split heads 3 are embedded around the prefabricated wall panel surface on the side close to the pit stone wall, and the height H of the inner supporting split heads 3 exposed out of the concrete surface is 100 mm;

step 2, prefabricating the concrete wallboard 1 on site: combining the upper and lower layers of rectangular template frames and the steel bars manufactured in the step 1 into a prefabricated wallboard, arranging single-layer bidirectional steel bars 4 and embedded inner-support split heads steel bars 3, pouring concrete, removing the template after the strength reaches the standard, and finishing the manufacturing of a concrete prefabricated wallboard finished product;

step 3, mounting the precast concrete wall panel 1: hoisting a finished precast concrete wallboard 1 to a flat part of the periphery of a pit for stacking, after the construction of pit cushion concrete positioning steel bars is completed, sequentially assembling the prefabricated concrete wallboards 1 from bottom to top from one end of the bottom of the pit, performing joint filling treatment on waterproof mortar at the position of an L-shaped cut 2, performing joint staggering assembly on a second layer of prefabricated wallboards, performing joint staggering assembly construction according to the mode until the designed elevation of a pit straight wall is reached, and entering the next process after the assembly of the whole wallboards is completed;

and 4, backfilling pit foundation pits of the pit to 200mm above the precast concrete wallboard 1 and below the surface elevation in a layered mode, pouring concrete on the straight wall, and backfilling the pit to the designed elevation in a layered mode when the strength of the concrete reaches 1.2 MPa.

In the step 2, the template is removed after the concrete strength reaches 75% of the design strength, the prefabricated wall panel is placed in a concentrated mode, and the prefabricated wall panel can be installed after the concrete strength reaches 100%.

And 4, before the prefabricated wall board is backfilled outside, the gaps between the bottom of the straight wall and the wall surface are tightly sealed, and a top support is arranged inside the cellar pool, so that the deformation of the cellar pool caused by the backfill side pressure is avoided.

The L-shaped kerf 2 has the size of 100mm in the longitudinal direction and 50mm in the transverse direction.

Claims

1. The assembling construction method of the pit straight wall is characterized by comprising the following specific operation steps of:

step 1, manufacturing a prefabricated wallboard template: the thickness H of the prefabricated wallboard is 100mm, the template is a combined template frame (5), the combined template frame (5) is divided into an upper rectangular template frame and a lower rectangular template frame, the size is 1000mm multiplied by 1500mm, three splicing positions of the side end of the prefabricated wallboard are made into L-shaped incisions (2) for staggered splicing, the steel bars are arranged into single-layer bidirectional steel bars (4), the periphery of the prefabricated wallboard surface close to one side of the cellar stone wall is embedded with inner supporting split heads (3), and the height H of the inner supporting split heads (3) exposed out of the concrete surface is 100 mm;

step 2, prefabricating the concrete wallboard (1) on site: combining the upper and lower layers of rectangular template frames and the steel bars manufactured in the step 1 into a prefabricated wallboard, arranging single-layer bidirectional steel bars (4) and pre-embedded split heads (3), pouring concrete, removing the template after the strength reaches the standard, and finishing the manufacturing of a concrete prefabricated wallboard finished product;

step 3, mounting the precast concrete wall panel (1): hoisting a finished precast concrete wallboard (1) to a flat position at the periphery of a pit for stacking, after the construction of pit cushion concrete positioning steel bars is completed, sequentially assembling the prefabricated concrete wallboards (1) from bottom to top from one end of the bottom of the pit, performing joint filling treatment on waterproof mortar at an L-shaped cut (2), performing joint staggering assembly on a second layer of prefabricated wallboards, performing joint staggering assembly construction according to the method until the designed elevation of a pit straight wall is reached, and entering the next process after the assembly of the whole wallboard is completed;

and step 4, backfilling pit foundation pits of the pit to 200mm above the precast concrete wallboard (1) and below the surface elevation in a layered mode, pouring concrete on the straight wall, and backfilling the pit to the designed elevation in a layered mode when the strength of the concrete reaches 1.2 MPa.

2. The assembled construction method for the pit straight wall as claimed in claim 1, wherein: in the step 2, the template is removed after the concrete strength reaches 75% of the design strength, the prefabricated wall panel is placed in a concentrated mode, and the prefabricated wall panel can be installed after the concrete strength reaches 100%.

3. The assembled construction method for the pit straight wall as claimed in claim 1, wherein: and 4, before the prefabricated wall board is backfilled outside, the gaps between the bottom of the straight wall and the wall surface are tightly sealed, and a top support is arranged inside the cellar pool, so that the deformation of the cellar pool caused by the backfill side pressure is avoided.