Construction method of support secondary foundation grouting material based on extremely cold environment

Abstract

The invention discloses a construction method of a support secondary foundation grouting material based on an extremely cold environment, which specifically comprises the following steps: arranging a grouting template around the periphery of a to-be-combined part to form a grouting cavity; impurity removal and non-contact heating are conducted on the interior of the grouting cavity through a heat source air blowing component; mixing with hot water to form the grouting material meeting the construction fluidity; grouting materials are injected into the grouting cavities; a plastic film is laid on the surface of the injected grouting material, and a supporting formwork is erected between the grouting formwork and the to-be-combined part; the supporting formwork is sequentially covered with a heat preservation layer, a heating layer and a protection layer which wrap the grouting cavity; and finally, sequentially dismantling, and normally maintaining the grouting material on the to-be-combined part. The construction method relates to the technical field of grouting and pouring, and through the steps, on the premise that the grouting and pouring strength of the secondary foundation of the support is guaranteed, the construction procedures are simplified, and the purposes of improving the construction speed and reducing the construction cost are achieved.

Description

Technical Field

[0001] The present invention belongs to the field of building construction, relates to grouting pouring technology, and specifically is a construction method for a grouting material for the secondary foundation of a bearing under extremely cold environments. Background Art

[0002] Bearings are important components that play a major supporting role in building components. Therefore, after the installation of the bearing is completed, it is usually necessary to carry out multiple pourings to improve its supporting performance.

[0003] Currently, there are certain defects in the process of the secondary foundation grouting of bearings: when constructing in extremely cold regions (such as when the environmental temperature is lower than -20°C), due to the construction environment temperature being at a low or negative temperature for a long time, the newly poured grouting material will lose heat in a very short time, and it is very difficult for the hydration heat temperature of the slurry to ensure that the slurry reaches an appropriate early strength after hardening. Specifically, when the grouting material is frozen due to low temperature, the internal mixing water will freeze into ice, and the volume of water increases by about 9% after freezing into ice, and at the same time, the hydration of cement also stops. Therefore, after restoring positive temperature curing, the porosity in the cement slurry will be significantly greater than that of normally set concrete, resulting in a comprehensive decline in the various physical and mechanical properties of the concrete, thereby affecting the stability of the bearing pouring. In the prior art, to solve this technical problem, construction workers generally use long-term erection of warm sheds to ensure the construction temperature. However, since this construction method requires the erection of warm sheds, the cost is high and the time consumption is long, thus affecting the overall construction progress and making it difficult to meet the actual application requirements.

[0004] Therefore, a construction method for a grouting material for the secondary foundation of a bearing under extremely cold environments is proposed herein to solve the above problems. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art; for this purpose, the present invention proposes a construction method for a grouting material for the secondary foundation of a bearing under extremely cold environments, to simplify the construction process on the premise of ensuring the grouting pouring strength of the secondary foundation of the bearing, so as to achieve the purpose of improving the construction rate and reducing the construction cost. The present invention preheats the grouting chamber, ensures that the grouting slurry injected into the grouting chamber reaches a temperature of 10°C - 20°C, and performs heat preservation, heating, and protection layer heating and curing after the grouting slurry is injected, which can effectively avoid the situation that the performance of the slurry is reduced due to freezing at low temperature, thereby ensuring the pouring strength of the secondary foundation grouting of the bearing, and the above steps do not require complex processes such as erecting warm sheds, so the time consumed by the construction process can be correspondingly shortened, thereby achieving the purpose of improving the construction rate.

[0006] To achieve the above object, the first aspect of the present invention provides a construction method of secondary foundation grouting material for bearings in an extremely cold environment, which specifically comprises the following steps:

[0007] A grouting template is arranged around the part to be joined to form a grouting chamber together with the part to be joined;

[0008] A heat source blowing component is used to remove impurities and non-contact heat the interior of the grouting chamber, so that the temperature of the interface between the grouting chamber and the grouting material reaches 10°C-20°C during the filling construction;

[0009] While removing impurities and heating the part to be combined, hot water is used to mix to form a grouting material that meets the construction fluidity, so that the temperature of the grouting material when combined with the grouting chamber is 10° C.-20° C.;

[0010] Injecting grouting material into the grouting chamber until the grouting material is filled to a preset height;

[0011] A plastic film is laid on the surface of the injected grouting material, and a plurality of detachable supporting templates suspended above the plastic film are set up between the grouting template and the part to be combined;

[0012] The support formwork is covered with an insulation layer, a heating layer and a protective layer that wrap the grouting chamber in sequence, so that the core temperature of the injected grouting material is not lower than 5°C during the initial curing time;

[0013] Finally, the protective layer, the heating layer, the thermal insulation layer and the grouting template are removed in sequence, and the grouting material on the to-be-bonded portion is normally maintained.

[0014] Furthermore, the part to be combined includes a primary foundation grouting layer, a support body, and an anchor bolt support extending to the outside of the primary foundation grouting layer and connected to the support body.

[0015] Furthermore, the upper surface height of the grouting template is higher than the height of the bottom wall skirt of the support body or is flush with the height of the bottom wall skirt of the support body, and is used to set up the supporting template.

[0016] Furthermore, the supporting template is configured as a long strip, and a plurality of the long strips are arranged in a ring shape around the outer side of the support body.

[0017] Furthermore, the thermal insulation layer is configured as a quilt to wrap the support body and the grouting template.

[0018] Further, the heating layer includes a heating cable and a heating blanket arranged in sequence;

[0019] Among them, the tracing cable winds around the cotton quilt to bundle and limit the cotton quilt with the corner ends of the support body and the grouting formwork;

[0020] The heating blanket covers the surface of the cotton quilt.

[0021] Furthermore, the protective layer is set as a waterproof cloth for wrapping the support body and the joint part to be combined.

[0022] Furthermore, the thickness of the heat preservation layer is 45mm - 55mm.

[0023] Furthermore, the heat source blowing component includes multiple groups of hot air blowers.

[0024] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0025] By preheating the grouting chamber, ensuring that the grouting slurry injected into the grouting chamber reaches a temperature of 10°C - 20°C, and heating and curing the heat preservation layer, heating layer, and protective layer laid after the grouting slurry is injected, it can effectively avoid the situation that the performance of the slurry is reduced due to freezing at low temperature, thereby ensuring the pouring strength of the secondary foundation grouting of the support. Moreover, in the above steps, complex processes such as building a warm shed are not required, so the duration consumed by the construction process can be correspondingly shortened, thereby achieving the purpose of improving the construction rate. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0027] Figure 1 It is a flow chart of the construction method of the secondary foundation grouting material of the support based on the extremely cold environment of the present invention;

[0028] Figure 2 It is a structural cross-sectional view after the construction of the secondary foundation grouting material of the support based on the extremely cold environment of the present invention.

[0029] Reference Numerals in the Drawings:

[0030] 1. Joint part to be combined; 11. Primary foundation grouting layer; 12. Support body; 13. Anchor bolt support; 2. Grouting formwork; 3. Support formwork; 4. Heat preservation layer; 5. Heating layer; 6. Protective layer. Detailed Embodiments

[0031] The technical scheme of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1 and Figure 2 As shown, the first embodiment of the present invention provides a construction method for secondary foundation grouting materials of a support in an extremely cold environment, which specifically includes the following steps:

[0033] Step 1: A grouting template 2 is arranged around the part to be joined 1 to form a grouting chamber together with the part to be joined 1.

[0034] Step 2: Use a heat source blowing component to remove impurities and perform non-contact heating on the inside of the grouting chamber. During the filling construction, the temperature of the interface between the grouting chamber and the grouting material reaches 10°C-20°C to preheat the grouting chamber. When the grouting material is injected into the grouting chamber, it can be kept above 0°C, thereby avoiding the grouting material absorbing the heat of the grouting material due to the excessively low temperature inside the grouting chamber when the grouting material is injected into the grouting chamber, thereby causing the grouting material to lose more heat in a short time (i.e., being frozen), resulting in its own performance being unable to meet the application requirements.

[0035] Step three, while removing impurities and heating the part to be combined 1, mix it with hot water to form a grouting material that meets the construction fluidity, so that the temperature of the grouting material when combined with the grouting chamber is 10℃-20℃, and the demoulding temperature of the grouting material is adapted to the temperature of the grouting chamber to prevent the temperature difference between the two from being too large and causing the grouting material to lose heat.

[0036] Step 4: inject grouting material into the grouting chamber until the grouting material is filled to a preset height.

[0037] Step 5: lay a plastic film on the surface of the injected grouting material, and set up a plurality of detachable supporting templates 3 suspended above the plastic film between the grouting template 2 and the part to be combined 1, so as to provide support for the subsequent laying of the insulation layer 4, the heating layer 5 and the protective layer 6 through the supporting template 3.

[0038] Step 6: Cover the support formwork 3 with the insulation layer 4, heating layer 5, and protective layer 6 that wrap the grouting chamber in sequence, so that the core temperature of the injected grouting material is not lower than 5°C within the initial curing time (usually 24h), in order to insulate the grouting material injected into the grouting chamber by means of the sequentially arranged insulation layer 4, heating layer 5, and protective layer 6, and prevent the situation of too rapid heat loss.

[0039] Step 7: Finally, remove the protective layer 6, heating layer 5, insulation layer 4, and grouting formwork 2 in sequence, and perform normal curing on the grouting material at the joint to be combined 1.

[0040] In this embodiment, the joint to be combined 1 includes a primary base grouting layer 11, a support body 12, and an anchor bolt support 13 that extends outside the primary base grouting layer 11 and is connected to the support body 12.

[0041] Moreover, the upper surface height of the grouting formwork 2 is higher than the height of the skirt at the bottom wall of the support body 12 or is flush with the height of the skirt at the bottom wall of the support body 12, and is used to set up the support formwork 3.

[0042] As Figure 2 shown, in an example, the height of the grouting formwork 2 is higher than the height of the skirt at the bottom wall of the support body 12, so that the support formwork 3 can be inclined downward along the direction close to the support body 12, so that a triangular support system can be formed around between the grouting formwork 2 and the support body 12 to meet the support requirements for the insulation layer 4, heating layer 5, and protective layer 6.

[0043] Among them, the support formwork 3 is set as a long strip board, and a plurality of the long strip boards are arranged in a ring around the outside of the support body 12.

[0044] It should be noted that the long strip board and the grouting formwork 2 and the support body 12 can be connected by means of lapping or bundling with steel wires to facilitate the rapid disassembly of subsequent demoulding.

[0045] In other embodiments, the insulation layer 4 is set as a cotton quilt to wrap the support body 12 and the grouting formwork 2.

[0046] Moreover, the thickness of the insulation layer 4 is 45mm - 55mm, and specifically, a 50mm cotton quilt can be set.

[0047] In a further embodiment, the heating layer 5 includes a heating cable and a heating blanket arranged in sequence.

[0048] Among them, the tracing cable winds around the cotton quilt, so that the cotton quilt is bundled and limited at the corner ends of the support body 12 and the grouting formwork 2. That is, the tracing cable can not only play a role in conducting heat to the cotton quilt for heat preservation, but also position the cotton quilt to prevent gaps from occurring when the grouting chamber formed by the surrounding of the support body 12 and the grouting formwork 2 is wrapped by the cotton quilt, thus avoiding the situation that the grouting material cannot achieve a better heat preservation effect.

[0049] In addition, the heating blanket covers the surface of the cotton quilt.

[0050] In this embodiment, the protective layer 6 is set as a waterproof cloth, which is used to wrap the support body 12 and the to-be-combined part 1 to prevent bad weather such as rain, snow or wind from affecting the heating of the heating layer 5 and improve the safety factor.

[0051] Among them, the heat source blowing component adopted in the second step includes multiple groups of hot air blowers, which use the hot air blown by the hot air blowers for non-contact heating and can remove the impurities inside the grouting chamber through wind force.

[0052] By preheating the grouting chamber of the present invention, ensuring that the grouting slurry injected into the grouting chamber reaches a temperature of 10°C - 20°C, and heating and curing the heat preservation layer 4, the heating layer 5 and the protective layer 6 laid after the grouting slurry is injected, the situation that the performance of the slurry is reduced due to freezing at low temperature can be effectively avoided, thereby ensuring the pouring strength of the secondary foundation grouting of the support. And in the above steps, complex processes such as building a warm shed are not required, so the duration consumed by the construction process can be correspondingly shortened, so as to achieve the purpose of improving the construction speed.

[0053] The above embodiments are only used to illustrate the technical method of the present invention and not to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical method of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical method of the present invention.

Claims

1. A construction method for secondary foundation grouting materials for bearings in an extremely cold environment, characterized in that: The specific steps include: A grouting template (2) is arranged around the part to be joined (1) to enclose the part to be joined (1) to form a grouting chamber; A heat source blowing component is used to remove impurities and non-contact heat the interior of the grouting chamber, so that the temperature of the interface between the grouting chamber and the grouting material reaches 10°C-20°C during the filling construction; While removing impurities and heating the part to be bonded (1), hot water is used to mix the grouting material to form a grouting material with sufficient fluidity for construction, so that the temperature of the grouting material when it is bonded to the grouting chamber is 10° C.-20° C.; Injecting grouting material into the grouting chamber until the grouting material is filled to a preset height; A plastic film is laid on the surface of the injected grouting material, and a plurality of detachable support templates (3) suspended above the plastic film are set up between the grouting template (2) and the part to be joined (1); The support formwork (3) is covered in sequence with an insulation layer (4), a heating layer (5) and a protective layer (6) that wrap the grouting chamber, so that the core temperature of the injected grouting material is not less than 5° C. during the initial curing time; Finally, the protective layer (6), the heating layer (5), the thermal insulation layer (4) and the grouting template (2) are removed in sequence, and the grouting material on the to-be-joined portion (1) is normally maintained.

2. The construction method of the secondary foundation grouting material for the support in an extremely cold environment according to claim 1 is characterized in that: The part to be combined (1) comprises a primary foundation grouting layer (11), a support body (12), and an anchor bolt support (13) extending to the outside of the primary foundation grouting layer (11) and connected to the support body (12).

3. The construction method of the secondary foundation grouting material for the support in an extremely cold environment according to claim 2 is characterized in that: The upper surface height of the grouting template (2) is higher than the height of the bottom wall skirt of the support body (12) or is flush with the height of the bottom wall skirt of the support body (12), and is used to set up the supporting template (3).

4. The construction method of the secondary foundation grouting material for the support in an extremely cold environment according to claim 3 is characterized in that: The supporting template (3) is configured as a long strip, and a plurality of the long strips are arranged in a ring shape around the outer side of the support body (12).

5. The construction method of the secondary foundation grouting material for the bearing in an extremely cold environment according to claim 2 is characterized in that: The thermal insulation layer (4) is configured as a quilt to wrap the support body (12) and the grouting template (2).

6. The construction method of the secondary foundation grouting material for the bearing in an extremely cold environment according to claim 5 is characterized in that: The heating layer (5) comprises a heating cable and a heating blanket which are arranged in sequence; The heating cable is wound around the quilt so that the quilt is bound and limited with the support body (12) and the corner end of the grouting template (2); The heating blanket covers the surface of the quilt.

7. The construction method of secondary foundation grouting material for bearings in an extremely cold environment according to claim 1 is characterized in that: The protective layer (6) is configured as a waterproof cloth, and is used to wrap the support body (12) and the part to be combined (1).

8. The construction method of secondary foundation grouting material for bearings in an extremely cold environment according to claim 1, characterized in that: The thickness of the thermal insulation layer (4) is 45 mm-55 mm.

9. The construction method of secondary foundation grouting material for bearings in an extremely cold environment according to claim 1, characterized in that: The heat source blowing component includes a plurality of groups of hot air blowers.

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