Grouting bag and construction method for back side grouting of steel enclosing purlin

Abstract

The invention provides a grouting bag and a construction method for grouting the back side of a steel enclosing purlin, and the grouting bag comprises a body which is provided with a containing cavity and is used for storing grout; the observation holes are formed in the first area of the containing cavity at intervals in the length direction of the body and communicate with the containing cavity; the grouting devices are embedded in the first area of the containing cavity at intervals in the length direction of the body and communicate with the containing cavity; the hanging holes are formed in the portion, away from the containing cavity, of the body in the length direction of the body at intervals and located above the first area of the containing cavity. Based on the grouting bag, after the steel enclosing purlin is installed, grouting operation can be directly carried out, and the grouting bag has the advantages of being easy to install, high in construction efficiency, high in construction quality and low in manufacturing cost; and the problems of grout leakage, low construction efficiency, unevenness and unevenness in grouting, difficulty in removing the grouting material attached to the enclosure structure after the steel enclosing purlin is removed and the like in the construction of filling the grouting material at the back of the existing steel enclosing purlin can be well solved.

Description

Technical Field

[0001] The invention relates to the technical field of foundation pit construction, and in particular to a grouting bag and a construction method for back grouting of a steel perimeter purlin. Background Art

[0002] In recent years, China's infrastructure construction has developed by leaps and bounds, especially in cities, which are gradually developing into three-dimensional space in the air, on the ground and underground. At present, foundation pit engineering is the most direct and effective way to make full use of underground space, and has been widely used in urban construction engineering, municipal engineering, rail transit engineering and other fields.

[0003] At present, steel support has been widely used in foundation pit projects as an internal support process that is convenient to construct, reusable, well-deformed, and green and low-carbon. In a foundation pit with multiple layers of support, the excavation of each layer must be carried out after the support structure of the current layer is completed and can exert its designed strength. The speed of support construction is the main constraint on the excavation and construction speed of the foundation pit. The steel support system is a fully prefabricated steel support component connected by bolts. Its installation speed is much faster than the total construction time of traditional concrete support processes such as steel bar binding, formwork support, concrete pouring, and maintenance.

[0004] In the actual construction process, in order to ensure that the steel support force can be evenly transmitted to the steel purlin and the surrounding structure, grouting treatment is required on the back of the steel purlin. The conventional grouting method is to insert geotextile at the bottom of the steel purlin and then perform grouting. However, this method has the problems of grout leakage, uneven grouting, unevenness, and low construction efficiency. Especially when the surface of the surrounding structure presents more serious ups and downs, it will greatly increase the risk of foundation pit deformation and cause safety hazards to foundation pit construction.

[0005] In view of the shortcomings of the grouting operation method for the back side of the steel purlin in the prior art, those skilled in the art have been looking for solutions. Summary of the invention

[0006] The purpose of the present invention is to provide a grouting bag and a construction method for grouting on the back of a steel purlin, so as to solve the problems of leakage, uneven grouting, unevenness, low construction efficiency and increased risk of foundation pit deformation in the grouting operation method of the back of a steel purlin in the prior art.

[0007] In order to solve the above technical problems, the present invention provides a grouting bag, which comprises:

[0008] A body having a receiving cavity for storing slurry;

[0009] A plurality of observation holes are spaced apart in the first region of the accommodating cavity along the length direction of the body and are in communication with the accommodating cavity;

[0010] A plurality of grouting devices are embedded in the first area of ​​the accommodating cavity at intervals along the length direction of the body and are communicated with the accommodating cavity;

[0011] A plurality of hanging holes are arranged at intervals along the length direction of the main body on the main body away from the accommodating cavity and are located above the first area of ​​the accommodating cavity.

[0012] Optionally, in the grouting bag, the height of the main body is 100 mm higher than the steel purlin, and the length of the main body is equal to the length of the steel purlin.

[0013] Optionally, in the grouting bag, the body is a polymer fiber nylon body.

[0014] Optionally, in the grouting bag, the grouting device is a detachable grouting device.

[0015] Optionally, in the grouting bag, the interval between two adjacent grouting devices is 1 m.

[0016] Optionally, in the grouting bag, the observation hole is an openable observation hole.

[0017] Optionally, in the grouting bag, the interval between two adjacent observation holes is 2m.

[0018] Optionally, in the grouting bag, the interval between two adjacent hanging holes is 1 m.

[0019] The present invention also provides a construction method for grouting the back side of a steel purlin, and the construction method for grouting the back side of a steel purlin comprises the following steps:

[0020] S1, preparation stage: prepare the grouting bags as described above according to the steel purlin;

[0021] S2. Install grouting bags: On the enclosure structure where the steel purlin is to be installed, a number of nails are implanted at a predetermined interval and a predetermined height along the length direction thereof, and the grouting bags are hung thereon, the bottom of the grouting bags after hanging being flush with the bottom of the steel purlin to be installed subsequently, and the top of the grouting bags is higher than the top of the steel purlin by a predetermined distance;

[0022] S3. Install steel purlins: Install corbels on the enclosure structure where the steel purlins need to be installed. First, place the steel purlins on the corbels, align the steel purlins with the fixed purlins with the aid of an excavator, and then fix them by spot welding. Then, temporarily weld the steel reinforcements welded on the enclosure structure to the steel purlins to fix the steel purlins to make them stable and vertical on the sides, and then immediately install the steel supports.

[0023] S4, injecting grouting material: using a manual grouting pump based on the grouting device on the grouting bag, press the premixed high-strength grouting material into the grouting bag at a pressure not greater than 0.2MPa. When the grouting material in the grouting bag reaches a predetermined height through the observation hole, stop grouting to complete the grouting of the back side of the current section of the steel perimeter purlin;

[0024] S5. Repeat steps S2 to S4 until all steel purlins are grouted.

[0025] Optionally, in the construction method for grouting the back side of the steel perimeter purlin, in S4, after completing the grouting of the back side of the current section of the steel perimeter purlin, the method further includes:

[0026] Remove all grouting devices from the grouting bags to prepare for the back grouting construction of the next section of steel purlin.

[0027] In the grouting bag and the construction method of grouting the back of the steel purlin provided by the present invention, the grouting bag includes: a main body, having a containing cavity for storing slurry; a plurality of observation holes, which are spaced apart in the first area of ​​the containing cavity along the length direction of the main body and are connected to the containing cavity; a plurality of grouting devices, which are spaced apart and embedded in the first area of ​​the containing cavity along the length direction of the main body and are connected to the containing cavity; a plurality of hanging holes, which are spaced apart along the length direction of the main body on the main body away from the containing cavity and are located above the first area of ​​the containing cavity. Based on the grouting bag of the present invention, after the installation of the steel purlin is completed, the grouting operation can be directly carried out, which has the advantages of simple installation, high construction efficiency, high construction quality and low cost, and can well solve the problems existing in the construction of the existing steel support purlin back filling grouting material, such as leakage, low construction efficiency, uneven grouting, unevenness, and difficulty in removing the grouting material attached to the enclosure structure after the steel purlin is removed. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The above and other objects, features and advantages of the present disclosure will become more apparent through a more detailed description of exemplary embodiments of the present disclosure in conjunction with the accompanying drawings, wherein like reference numerals generally represent like components throughout the exemplary embodiments of the present disclosure.

[0029] Figure 1 is a schematic plan view of a grouting bag in one embodiment of the present invention;

[0030] Figure 2 is a side schematic diagram of a grouting bag in one embodiment of the present invention;

[0031] Figure 3 It is a schematic diagram of the installation and construction of the steel purlin in one embodiment of the present invention;

[0032] Figure 4 This is a schematic diagram of the construction stage of injecting grouting material in one embodiment of the present invention;

[0033] Figure 5The present invention is a flowchart of a construction method for back grouting of a steel purlin in one embodiment of the present invention.

[0034] In the figure:

[0035] 1-body; 11-accommodating chamber; 100-first area;

[0036] 2-Observation hole;

[0037] 3- Grouting machine;

[0038] 4-Hanging hole;

[0039] 5-Manual grouting pump. DETAILED DESCRIPTION

[0040] The following is a further detailed description of the grouting bag and the construction method of the back grouting of the steel purlin proposed in the present invention in combination with the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer according to the following description and claims. It should be noted that the drawings are all in a very simplified form and are not in precise proportions, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention.

[0041] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the present invention in a schematic manner, and therefore only show the components related to the present invention.

[0042] In the description of the invention, it is necessary to understand that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the invention.

[0043] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] In the invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the invention can be understood according to the specific circumstances.

[0045] Please refer to Figure 1 and Figure 2 The grouting bag comprises: a body 1, a plurality of observation holes 2, a plurality of grouting devices 3 and a plurality of hanging holes 4. The body 1 has a receiving cavity 11 for storing slurry; a plurality of observation holes 2 are arranged at intervals in the first region 100 of the receiving cavity 11 along the length direction of the body 1 and are communicated with the receiving cavity 11; a plurality of grouting devices 3 are arranged at intervals in the first region 100 of the receiving cavity 11 along the length direction of the body 1 and are communicated with the receiving cavity 11; a plurality of hanging holes 4 are arranged at intervals in the length direction of the body 1 on the body 1 away from the receiving cavity 11 and are located above the first region 100 of the receiving cavity 11. Preferably, the receiving cavity 11 is a rectangular receiving cavity 11.

[0046] Based on the grouting bag of the present invention, grouting operation can be directly carried out after the steel purlin is installed. It has the advantages of simple installation, high construction efficiency, high construction quality and low cost, and can replace the conventional steel purlin back grouting process at the current construction site.

[0047] Since the grouting bag is used for grouting construction on the back side of the steel purlin, the size of the grouting bag needs to be customized according to the steel purlin of the construction section, specifically: the height of the grouting bag body 1 is 100mm higher than the steel purlin, and the length of the body 1 is equal to the length of the steel purlin.

[0048] Preferably, the main body 1 is made of high molecular fiber nylon, which is a material that is slightly permeable to water and air, and has a tear strength of not less than 3 MPa.

[0049] Preferably, the grouting device 3 is a detachable grouting device 3 so as to be recyclable and reused.

[0050] In this embodiment, Figure 1 and Figure 2 As shown, the interval between two adjacent grouting devices 3 is 1 m; the observation hole 2 is an openable observation hole 2, and the interval between two adjacent observation holes 2 is 2 m; the interval between two adjacent hanging holes 4 is 1 m.

[0051] Correspondingly, this embodiment also provides a construction method for grouting the back side of a steel purlin. Figures 1 to 5The construction method of grouting the back side of the steel purlin described in this embodiment is described in detail.

[0052] First, perform step S1, the preparation stage: prepare the grouting bag as described above according to the steel purlin; specifically, the grouting bag needs to be customized according to the size of the steel purlin so as to achieve a better grouting effect on the back of the steel purlin. In this embodiment, the height of the grouting bag body 1 is required to be 100 mm higher than the steel purlin, and the length of the body 1 is equal to the length of the steel purlin.

[0053] Next, execute step S2 to install the grouting bags: on the enclosure structure where the steel purlin needs to be installed, a number of nails are implanted along its length direction at a predetermined interval and a predetermined height, and the grouting bags are hung thereon, the bottom of the grouting bag after hanging is flush with the bottom of the subsequently installed steel purlin, and the top of the grouting bag is higher than the top of the steel purlin by a predetermined distance.

[0054] Specifically, in the part where the steel purlin needs to be installed, a nail gun is used in advance to implant nails at an angle of 45° at every 1m on the enclosure structure to fix the grouting bag. Then, the grouting bag prepared in advance is hung on the nails through the hanging hole 4, so that the grouting bag is hung on the enclosure structure at a predetermined height. The predetermined height here makes the bottom of the grouting bag after hanging flush with the bottom of the steel purlin to be installed later, and the top of the grouting bag is higher than the top of the steel purlin by a predetermined distance; in this embodiment, the predetermined distance is preferably 100mm.

[0055] Next, please refer to Figure 3 and Figure 4 , execute step S3, install the steel purlin: install the corbel on the enclosure structure at the location where the steel purlin needs to be installed, first place the steel purlin on the corbel, use an excavator to assist in aligning the steel purlin with the fixed purlin, and then perform spot welding to fix it; then temporarily weld the tie rods welded to the enclosure structure to the steel purlin to fix the steel purlin to make it stable and vertical on the side, and then immediately install the steel support.

[0056] Among them, the relevant information of the corbel is as follows: the corbel is mostly made of angle iron, and is connected to the enclosing structure by welding with the embedded parts in the enclosing structure. The corbel is mainly used to place the steel purlin to facilitate the installation of the steel purlin.

[0057] Next, execute step S4 to inject grouting material: use a manual grouting pump 5 based on the grouting device 3 on the grouting bag to press the premixed high-strength grouting material into the grouting bag at a pressure not greater than 0.2 MPa. When the slurry in the grouting bag reaches a predetermined height as observed through the observation hole 2, stop grouting to complete the grouting of the back side of the current section of the steel perimeter purlin; in order to reduce construction costs, all grouting devices 3 in the grouting bag are removed for the grouting construction of the back side of the next section of the steel perimeter purlin.

[0058] The observation hole 2 here serves as an observation and ventilation hole for observing whether the grouting is in place and ensuring that the excess gas in the grouting bag can be discharged from the hole.

[0059] Next, execute step S5, and repeat steps S2 to S4 until the grouting of all steel purlins is completed.

[0060] It should be noted that, for the aforementioned method embodiments, for the sake of simplicity, they are all expressed as a series of action combinations, but those skilled in the art should be aware that the present application is not limited by the described order of actions, because according to the present application, certain steps can be performed in other orders or simultaneously. Secondly, those skilled in the art should also be aware that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily required by the present application.

[0061] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0062] The present invention has the following advantages:

[0063] 1) After the steel perimeter purlin is installed, the grouting operation can be directly carried out based on the grouting bag of the present invention, which has the advantages of simple installation, high construction efficiency, high construction quality and low cost, and can replace the conventional steel perimeter purlin grouting process at the current construction site.

[0064] 2) It can well guarantee the grouting construction quality during the steel support construction process, improve the steel support installation efficiency, and can well solve the problems of leakage during the construction of the existing steel support purlin back filling grouting material, low construction efficiency, uneven grouting, unevenness, and difficulty in removing the grouting material attached to the enclosure structure after the steel purlin is removed.

[0065] 3) The back grouting construction of the steel purlin based on the grouting bag of the present invention can fundamentally avoid the various disadvantages of the conventional purlin back filling process, thereby changing the stress condition of the back of the steel purlin, making the enclosure structure evenly bear the entire load of the steel support, and reducing the deformation of the enclosure pit.

[0066] The above description is only a description of the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention. Any changes or modifications made by a person skilled in the art in the field of the present invention based on the above disclosure shall fall within the scope of protection of the claims.

Claims

1. A grouting bag, characterized in that: include: A body having a receiving cavity for storing slurry; A plurality of observation holes are spaced apart in the first region of the accommodating cavity along the length direction of the body and are in communication with the accommodating cavity; A plurality of grouting devices are embedded in the first area of ​​the accommodating cavity at intervals along the length direction of the body and are communicated with the accommodating cavity; A plurality of hanging holes are arranged at intervals along the length direction of the main body on the main body away from the accommodating cavity and are located above the first area of ​​the accommodating cavity.

2. The grouting bag according to claim 1, characterized in that: The height of the main body is 100 mm higher than the steel purlin, and the length of the main body is equal to the length of the steel purlin.

3. The grouting bag according to claim 1, characterized in that: The main body is a high molecular fiber nylon main body.

4. The grouting bag according to claim 1, characterized in that: The grouting device is a detachable grouting device.

5. The grouting bag according to claim 1 or 4, characterized in that: The interval between two adjacent grouting machines is 1m.

6. The grouting bag according to claim 1, characterized in that: The observation hole is an openable observation hole.

7. The grouting bag according to claim 1 or 6, characterized in that: The interval between two adjacent observation holes is 2m.

8. The grouting bag according to claim 1, characterized in that: The interval between two adjacent hanging holes is 1m.

9. A construction method for grouting the back side of a steel purlin, characterized in that: The following steps are involved: S1, preparation stage: preparing a grouting bag as described in any one of claims 1 to 8 according to the steel purlin; S2. Install grouting bags: On the enclosure structure where the steel purlin is to be installed, a number of nails are implanted at a predetermined interval and a predetermined height along the length direction thereof, and the grouting bags are hung thereon, the bottom of the grouting bags after hanging being flush with the bottom of the steel purlin to be installed subsequently, and the top of the grouting bags is higher than the top of the steel purlin by a predetermined distance; S3. Install steel purlins: Install corbels on the enclosure structure where the steel purlins need to be installed. First, place the steel purlins on the corbels, align the steel purlins with the fixed purlins with the aid of an excavator, and then fix them by spot welding. Then, temporarily weld the steel reinforcements welded on the enclosure structure to the steel purlins to fix the steel purlins to make them stable and vertical on the sides, and then immediately install the steel supports. S4, injecting grouting material: using a manual grouting pump based on the grouting device on the grouting bag, press the premixed high-strength grouting material into the grouting bag at a pressure not greater than 0.2MPa. When the grouting material in the grouting bag reaches a predetermined height through the observation hole, stop grouting to complete the grouting of the back side of the current section of the steel perimeter purlin; S5. Repeat steps S2 to S4 until the grouting of all steel purlins is completed.

10. The grouting bag according to claim 9, characterized in that: In executing S4, after completing the back grouting of the current section of the steel purlin, the following steps are also included: Remove all grouting devices from the grouting bags to prepare for the back grouting construction of the next section of steel purlin.

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