CN112095654A - Construction method of cantilever type concrete retaining wall in narrow operation surface - Google Patents
Construction method of cantilever type concrete retaining wall in narrow operation surface Download PDFInfo
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- CN112095654A CN112095654A CN202010795625.7A CN202010795625A CN112095654A CN 112095654 A CN112095654 A CN 112095654A CN 202010795625 A CN202010795625 A CN 202010795625A CN 112095654 A CN112095654 A CN 112095654A
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- retaining wall
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D29/00—Independent underground or underwater structures; Retaining walls
- E02D29/02—Retaining or protecting walls
- E02D29/0258—Retaining or protecting walls characterised by constructional features
- E02D29/0275—Retaining or protecting walls characterised by constructional features cast in situ
Abstract
The invention discloses a construction method of a cantilever type concrete retaining wall in a narrow operation surface, which comprises the following steps of pouring a retaining wall cushion layer; binding retaining wall foundation steel bars, erecting a template, then pouring concrete, positioning and embedding steel pipes before initial setting, and performing high-strength waterproof mortar plastering treatment on the roots of the embedded steel pipes; the wall body of the retaining wall is prefabricated by adopting on-site concrete, a PVC sleeve and a lifting hook are arranged in the concrete and embedded in the concrete, and the embedded position of the PVC sleeve is matched with the position of an embedded steel pipe; the concrete wall bodies are assembled with the retaining wall foundation by adopting a crane, PVC sleeves of the concrete wall bodies are sleeved into the embedded steel pipes of the retaining wall foundation, and waterproof mortar is used for plastering and bonding between the concrete wall bodies and the retaining wall foundation; and (5) treating the settlement joint of the retaining wall, backfilling earthwork and finishing construction of the retaining wall. The method does not need to support a wall body template, improves the construction operation efficiency and the overall stability of the wall body, reduces the construction cost of the project, and realizes the quick and efficient construction of the retaining wall.
Description
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a construction method of a cantilever type concrete retaining wall in a narrow working face.
Background
The retaining wall is a structure for supporting a roadbed fill or a slope soil body and preventing the fill or the soil body from being deformed and unstable, and can be roughly divided into different forms such as a gravity type, a weight balance type, a cantilever type, a buttress type and the like according to the structural form and the structural characteristics of the retaining wall. Retaining wall is applicable to in municipal works or highway engineering in a large number, but in the present day that civil buildings are developing day by day, also can appear because the relief height difference is great, has the condition of design retaining wall. In civil buildings, various factors such as over-dense buildings or structures, narrow construction working surface, smaller terrain height difference and smaller highway engineering can occur. Under the above limiting factors, the conventional construction scheme construction of the retaining wall causes the conditions of low personnel construction efficiency and increased measure cost. Therefore, the design of the cantilever concrete retaining wall is mostly adopted for civil buildings under the condition of ensuring safety, applicability and economy by correspondingly changing according to the characteristics of each project. Under normal conditions, the conventional simplified construction process of the cantilever type concrete retaining wall comprises the following steps: excavating earthwork, tamping a base, supporting a cushion layer template, pouring concrete, paving and binding retaining wall limb leg reinforcing steel bars, binding upper reserved reinforcing steel bars, supporting the limb leg template, supporting an upper 300-500 mm high template, pouring lower concrete, binding upper wall reinforcing steel bars, supporting an upper wall template, reserving a drain pipe and pouring wall concrete. Because retaining wall height is not necessary, the wall body is pour and can be poured by segments according to actual conditions.
However, the traditional construction process is only suitable for being carried out under the condition of having enough working surfaces, and when the working surfaces are narrow and the formworks cannot be erected, and the high-altitude operation (more than 2 m) has no relevant measures, the construction efficiency is lower, even the pouring forming quality is poorer, and the engineering construction cost is improved.
Disclosure of Invention
The invention aims to solve the technical problem of providing a construction method of the cantilever type concrete retaining wall in the narrow operation surface, and the method does not need to support a wall body template, improves the construction operation efficiency and the overall stability of the wall body, reduces the engineering construction cost, and realizes the quick and efficient construction of the cantilever type concrete retaining wall.
In order to solve the technical problem, the construction method of the cantilever type concrete retaining wall in the narrow working face comprises the following steps:
firstly, excavating earthwork in a design range of the cantilever type concrete retaining wall, clearing and leveling the bottom, ensuring that the bearing capacity of a foundation at the bottom of the retaining wall meets the design requirement, and finishing the pouring of a cushion layer of the retaining wall;
step two, after binding of reinforcing steel bars of a foundation part of the retaining wall and erecting of a template, pouring concrete, positioning and pre-embedding steel pipes according to design requirements before initial setting of the concrete during pouring, and after the strength of the concrete is achieved, performing high-strength waterproof mortar plastering on the roots of the pre-embedded steel pipes by at least 10 cm;
constructing a retaining wall body, wherein the upper structure of the retaining wall body is a concrete wall body, the concrete wall body is prefabricated on site, a PVC sleeve and a lifting hook are arranged in the concrete body in a pre-embedded mode, the pre-embedded position of the PVC sleeve is matched with the position of a pre-embedded steel pipe, and the retaining wall body is molded and maintained to reach the design strength after being demolded;
step four, hoisting and installing the concrete wall body, namely splicing the prefabricated concrete wall body and the retaining wall foundation by adopting a crane to match with a pre-embedded lifting hook, sleeving a PVC sleeve of the concrete wall body into a pre-embedded steel pipe of the retaining wall foundation, and plastering and bonding the adjacent concrete wall bodies and the concrete wall body and the retaining wall foundation by adopting waterproof mortar;
and step five, treating the settlement joint of the retaining wall, backfilling earthwork and finishing the construction of the retaining wall.
Further, the retaining wall foundation steel pipe location embedded steel pipe is perpendicularly arranged along the top surface of the retaining wall foundation at intervals, the exposed length of the embedded steel pipe is at least 1 meter, and the thickness of the high-strength waterproof mortar surface at the root of the embedded steel pipe is 10 mm.
Further, the diameter of the bottom of the PVC sleeve is larger than that of the upper portion of the PVC sleeve, the high-strength waterproof mortar surface of the root of the embedded steel pipe is contained at the bottom of the PVC sleeve, and the embedded steel pipe body is contained at the upper portion of the PVC sleeve.
Furthermore, concave-convex surfaces are respectively arranged on two sides of the concrete wall body, and the concave-convex surfaces of the joints of the adjacent concrete wall bodies are matched and coated with waterproof mortar with the thickness of 20 mm.
Further, the retaining wall foundation part is integrally divided and poured according to the settlement joint.
Furthermore, the width of the concrete wall body prefabricated on site is 1.0-1.2 m.
The construction method of the cantilever type concrete retaining wall in the narrow working face adopts the technical scheme, namely the method performs earthwork excavation, cleans the bottom and levels, and completes the pouring of the retaining wall cushion layer; binding retaining wall foundation steel bars, erecting a template, then pouring concrete, positioning and embedding steel pipes before initial setting of concrete, and after the strength of the concrete is achieved, performing high-strength waterproof mortar plastering treatment on the roots of the embedded steel pipes; constructing a retaining wall body, prefabricating the wall body by adopting on-site concrete, placing a PVC sleeve and a lifting hook in the concrete for embedding, matching the embedded position of the PVC sleeve with the position of an embedded steel pipe, and maintaining to reach the design strength after molding and demolding; hoisting the concrete wall body, assembling the concrete wall body and the retaining wall foundation by adopting a crane, sleeving a PVC sleeve of the concrete wall body into a pre-embedded steel pipe of the retaining wall foundation, and plastering and bonding adjacent concrete wall bodies and the concrete wall body and the retaining wall foundation by adopting waterproof mortar; and (5) treating the settlement joint of the retaining wall, backfilling earthwork and finishing construction of the retaining wall. According to the method, a wall body template does not need to be erected, the construction operation efficiency and the overall stability of the wall body are improved, the engineering construction cost is reduced, and the rapid and efficient construction of the cantilever type concrete retaining wall is realized.
Drawings
The invention is described in further detail below with reference to the following figures and embodiments:
FIG. 1 is a schematic cross-sectional view of a retaining wall in the present method;
FIG. 2 is a schematic view of the structure of the retaining wall foundation and the embedded steel pipes in the method;
FIG. 3 is a top view of FIG. 2
FIG. 4 is a schematic view of the concrete wall structure in the method;
FIG. 5 is a top view of FIG. 4;
FIG. 6 is a schematic diagram of the splicing of adjacent concrete walls in the method.
Detailed Description
Embodiment as shown in fig. 1 to 5, the construction method of the cantilever type concrete retaining wall in a narrow working plane according to the present invention comprises the steps of:
firstly, excavating earthwork in the design range of the cantilever type concrete retaining wall 1, clearing and leveling the bottom, ensuring that the bearing capacity of a foundation at the bottom of the retaining wall 1 meets the design requirement, and finishing the pouring of a retaining wall cushion layer;
step two, after binding of part of reinforcing steel bars of the retaining wall foundation 11 and erecting of a template, pouring concrete, wherein during pouring, before initial setting of the concrete, the steel pipes 2 need to be positioned and embedded according to design requirements, and after the strength of the concrete is achieved, the root parts of the embedded steel pipes 2 are subjected to high-strength waterproof mortar plastering, wherein the height of 21 cm is at least 10 cm;
step three, constructing a retaining wall body, wherein the upper structure of the retaining wall 1 is a concrete wall body 12, the concrete wall body 12 is prefabricated on site, the interior of the retaining wall body is embedded in concrete by adopting a PVC sleeve 3 and a lifting hook 4, the embedded position of the PVC sleeve 3 is matched with the position of an embedded steel pipe 2, and the retaining wall body is cured to reach the design strength after molding and demolding;
step four, hoisting and mounting the concrete wall body 12, assembling the prefabricated concrete wall body 12 and the retaining wall foundation 11 by matching a crane with a pre-embedded lifting hook 4, sleeving a PVC sleeve 3 of the concrete wall body 12 into a pre-embedded steel pipe 2 of the retaining wall foundation 11, and plastering and bonding the adjacent concrete wall bodies 12 and the concrete wall body 12 and the retaining wall foundation 11 by using waterproof mortar;
and step five, treating the settlement joint of the retaining wall 1, and backfilling earthwork to finish the construction of the retaining wall.
Preferably, the retaining wall foundation 11 steel pipe location embedded steel pipe 2 is vertically arranged along the top surface of the retaining wall foundation 11 at intervals, the exposed length of the embedded steel pipe 2 is at least 1 meter, and the thickness of the high-strength waterproof mortar surface 21 at the root of the embedded steel pipe 2 is 10 mm.
Preferably, the diameter of the bottom of the PVC sleeve 3 is larger than that of the upper part of the PVC sleeve, the high-strength waterproof mortar plastering surface 21 at the root of the embedded steel pipe 2 is contained at the bottom of the PVC sleeve 3, and the embedded steel pipe 2 body is contained at the upper part of the PVC sleeve.
Preferably, as shown in fig. 6, both sides of the concrete wall 12 are respectively provided with concave and convex surfaces 13, 14, and the concave and convex surfaces 13, 14 of the joint of the adjacent concrete walls 12 are matched and coated with waterproof mortar 15 with the thickness of 20 mm.
Preferably, the retaining wall foundation 11 is integrally divided and poured according to the settlement joint.
Preferably, the width of the concrete wall 12 prefabricated on site is 1.0-1.2 m.
The method does not need to support a wall body template, greatly improves the construction efficiency, and has poor integral stability of the wall body. Compared with the support of the cast-in-place concrete retaining wall, the support has no more difference. The method is applied to the construction space of a narrow working face, avoids the condition of casting concrete in sections and times when the wall body is higher, and reduces the procedures of secondary support of the template, secondary casting of the concrete and erection of the frame during the operation of rising; the lower part of the retaining wall is cast-in-place, the upper part of the retaining wall is prefabricated, and a joint between the two parts just meets the drainage requirement of the retaining wall without a special process of reserving a drainage pipe; the construction efficiency is greatly improved through assembling, a large amount of time and labor cost are saved, the construction period can be obviously shortened, and the cost is reduced.
Claims (6)
1. A construction method of a cantilever type concrete retaining wall in a narrow operation surface is characterized by comprising the following steps:
firstly, excavating earthwork in a design range of the cantilever type concrete retaining wall, clearing and leveling the bottom, ensuring that the bearing capacity of a foundation at the bottom of the retaining wall meets the design requirement, and finishing the pouring of a cushion layer of the retaining wall;
step two, after binding of reinforcing steel bars of a foundation part of the retaining wall and erecting of a template, pouring concrete, positioning and pre-embedding steel pipes according to design requirements before initial setting of the concrete during pouring, and after the strength of the concrete is achieved, performing high-strength waterproof mortar plastering on the roots of the pre-embedded steel pipes by at least 10 cm;
constructing a retaining wall body, wherein the upper structure of the retaining wall body is a concrete wall body, the concrete wall body is prefabricated on site, a PVC sleeve and a lifting hook are arranged in the concrete body in a pre-embedded mode, the pre-embedded position of the PVC sleeve is matched with the position of a pre-embedded steel pipe, and the retaining wall body is molded and maintained to reach the design strength after being demolded;
step four, hoisting and installing the concrete wall body, namely splicing the prefabricated concrete wall body and the retaining wall foundation by adopting a crane to match with a pre-embedded lifting hook, sleeving a PVC sleeve of the concrete wall body into a pre-embedded steel pipe of the retaining wall foundation, and plastering and bonding the adjacent concrete wall bodies and the concrete wall body and the retaining wall foundation by adopting waterproof mortar;
and step five, treating the settlement joint of the retaining wall, backfilling earthwork and finishing the construction of the retaining wall.
2. The method for constructing a cantilever-type concrete retaining wall in a narrow working plane according to claim 1, wherein: the retaining wall foundation steel pipe location pre-buried steel pipe sets up perpendicularly along retaining wall foundation top surface interval to pre-buried steel pipe exposes length 1 meter at least, and the thickness of pre-buried steel pipe root high strength waterproof mortar plastering is 10 mm.
3. The method of constructing a cantilever-type concrete retaining wall in a narrow working plane according to claim 1 or 2, wherein: the diameter of the bottom of the PVC sleeve is larger than that of the upper portion of the PVC sleeve, the high-strength waterproof mortar surface of the root of the embedded steel pipe is contained at the bottom of the PVC sleeve, and the embedded steel pipe body is contained at the upper portion of the PVC sleeve.
4. The method of constructing a cantilever-type concrete retaining wall in a narrow working plane according to claim 3, wherein: the concrete wall body both sides are equipped with the concave-convex surface respectively, and the concave-convex surface of adjacent concrete wall body seam is joined in marriage and is adopted 20mm thick waterproof mortar to paint.
5. The method for constructing a cantilever-type concrete retaining wall in a narrow working plane according to claim 1, wherein: and the retaining wall foundation part is integrally divided and poured according to the settlement joint.
6. The method for constructing a cantilever-type concrete retaining wall in a narrow working plane according to claim 1, wherein: the width of the concrete wall body prefabricated on site is 1.0-1.2 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202010795625.7A CN112095654A (en) | 2020-08-10 | 2020-08-10 | Construction method of cantilever type concrete retaining wall in narrow operation surface |
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| CN202010795625.7A CN112095654A (en) | 2020-08-10 | 2020-08-10 | Construction method of cantilever type concrete retaining wall in narrow operation surface |
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| CN112095654A true CN112095654A (en) | 2020-12-18 |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209989833U (en) * | 2019-03-15 | 2020-01-24 | 上海市水利工程集团有限公司 | Assembled prefabricated staggered combined retaining wall |
| CN210369031U (en) * | 2019-07-10 | 2020-04-21 | 哈尔滨市市政工程设计院 | Slurry anchor lap joint type prefabricated retaining wall unit and prefabricated retaining wall |
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2020
- 2020-08-10 CN CN202010795625.7A patent/CN112095654A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN209989833U (en) * | 2019-03-15 | 2020-01-24 | 上海市水利工程集团有限公司 | Assembled prefabricated staggered combined retaining wall |
| CN210369031U (en) * | 2019-07-10 | 2020-04-21 | 哈尔滨市市政工程设计院 | Slurry anchor lap joint type prefabricated retaining wall unit and prefabricated retaining wall |
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Application publication date: 20201218 |
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