grade III waterproof D.

Improper second: before the construction of waterproof layer, ordinary mortar with strength grade M5 shall be used to block and smooth the holes and gaps on the base course surface; Reason: the waterproof mortar of the same grade as the waterproof mortar of the waterproof layer shall be used to smooth the holes and gaps on the surface of the base course; No.

E.

grade II waterproof C.

Click the blank space below to get the answer a [analysis] the coiled material waterproof layer should be laid on the upstream surface of the concrete structure.

adopt one fortification E.

Level 2 b.

D.

the upper and lower layers of coiled materials shall not be laid vertically to each other.

After the final setting of cement mortar waterproof layer, it shall be cured in time.

The project department put forward technical requirements for the construction of M5 cement mortar waterproof layer in the basement; Ordinary portland cement, tap water, medium sand, waterproof agent and other materials shall be used for mixing, and the mud content of medium sand shall not be greater than 3%; Before the construction of the waterproof layer, the holes and gaps on the surface of the base course shall be blocked and smoothed with ordinary mortar with strength grade M5; The waterproof layer shall be formed in one time, compacted during paving, the surface shall be raised and polished, and moisturized and maintained for 7 days in time.

the coiled material waterproof layer is laid on the upstream surface of the external wall B.

The roof waterproof grade of important buildings is grade I waterproof, and two layers of fortification are adopted.

Have you really mastered it? It is suggested to review yesterday’s handout before doing it → the handout is coming, and these key points must be recorded in the small notebook! [No.15] handout of No.1 Construction underground engineering waterproof construction [example 1 · single choice] the waterproof grade of underground engineering is divided into ().

The full bonding method shall be adopted for paving coiled materials on the waterproof concrete cushion of the foundation slab.

A.

Click the blank space below to get the answer [reference answer] 3 Improper one: Ordinary portland cement, tap water, medium sand, waterproof agent and other materials shall be used for mixing, and the mud content of medium sand shall not be greater than 3%; Reason: Portland cement, ordinary portland cement or special cement shall be used for cement mortar.

E.

This week’s one construction exercise is coming.

[example 3 · multiple choices] the correct methods for lap joint of coiled material waterproof layer are ()..

B.

the coiled material outside the external wall adopts the empty paving method D.

when paving the double-layer coiled material, the two layers of coiled material are perpendicular to each other.

When laying double-layer coiled materials, the joints of the upper and lower layers and two adjacent coiled materials shall be staggered by 1 / 3-1 / 2 / width, and the two layers of coiled materials shall not be laid vertically to each other.

Each villa has one floor underground and three floors above the ground, with brick concrete structure.

Therefore, AE is selected for this topic.

during the construction of gutter coiled materials, they shall be laid along the gutter direction.

[example 2 · single choice] in the construction method of coiled material waterproof layer of basement exterior wall, the correct one is ().

Improper fourth: moisturizing and curing for 7 days; Reason: the cement mortar waterproof layer shall be cured for at least 14 days.

Level 3 C.

Medium sand should be used, and the mud content should not be greater than 1%.

A.

[2013] [2021] A.

Click the blank space below to get the answer CE [analysis] this question examines the construction of waterproof concrete waterproof coiled materials.

Hello everyone, I’m your big red teacher! Review the old and know the new.

[example 4 · multiple choice] the correct statement about construction waterproof coiled material is ().

[example 2 · multiple choices] the basic requirements for roof waterproof construction are ().

C.

The coiled material at the concrete part of the cushion of the structural bottom plate can be constructed by empty paving method or point bonding method; The coiled material of the side wall adopting the external anti sticking method and the coiled material of the top plate shall be constructed by the full sticking method; The internal and external corners of the base course shall be made into circular arc or 45 ° slope angle; When paving double-layer coiled materials, the joints of the upper and lower layers and two adjacent coiled materials shall be staggered by 1 / 3 ~ 1 / 2 of the width, and the two layers of coiled materials shall not be paved vertically to each other.

during the waterproof construction of roof coiled materials, they shall be laid from high to low.

A.

grade I waterproof B.

[example 3 · single choice] the cement mortar waterproof layer shall be cured in time after final setting, and the curing time shall not be less than () days.

7b.14c.21d.28 click the blank space below to get the answer B [analysis] this question examines the construction requirements of cement mortar.

The curing temperature shall not be lower than 5 ℃, and the mortar surface shall be kept moist.

B.

Click the blank below to get the answer BDE [analysis] this question examines the roof construction requirements.

the coiled material waterproof layer is laid on the back surface of the external wall C.

The curing time shall not be less than 14 days.

[2018] a.

the point bonding method shall be adopted for the external anti external paving coiled materials of the outer wall of the basement.

3: the waterproof layer construction requires one-time survival; Reason: the waterproof mortar should be constructed by multi-layer plastering and pressing method.

D.

when paving double-layer coiled materials, The joints between the upper and lower layers of coiled materials shall be staggered.

Roof waterproof engineering construction [example 1 · multiple choices] the statement about the roof waterproof grade and fortification requirements of important buildings is correct ().

the inner and outer corners of the base course shall be made into arcs or corners before paving.

C.

Click the blank below to get the answer AE [analysis] this question examines the roof waterproof grade and fortification requirements.

The coiled material of the side wall adopting the external anti sticking method and the coiled material of the top plate shall be constructed by the full sticking method.

adopt two fortifications.

level 5 click the blank below to get the answer C [analysis] the waterproof level of underground works is divided into level 1, level 2, level 3 and level 4.

the full adhesion method shall be used to paste coiled materials on the facade or large slope.

Roof waterproofing shall be based on prevention, supplemented by drainage; During the construction of coiled material waterproof layer, the detailed structure shall be treated first, and then paved upward from the lowest elevation of the roof; The coiled material should be laid parallel to the ridge, and the upper and lower coiled materials shall not be laid perpendicular to each other; During the construction of eaves gutter and gutter coiled material, it should be paved along the direction of eaves gutter and gutter, and the lap joint should be along the direction of running water; When paving the coiled material on the facade or large slope, the full bonding method shall be adopted, and the overlapping of the short side of the coiled material should be reduced.

[example 5 · case excerpt] [2017] [background] a new villa group project has a total construction area of 45000 m2.

[2019] A.

level 4 d.

[question] 3 Find out the inadequacies of the project department’s technical requirements for the construction of cement mortar waterproof layer in the basement, and explain the reasons respectively.

when paving double-layer coiled materials, the upper and lower coiled materials shall be paved vertically.

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