Grouting-type bag device and method for filling limiting of fabricated structure peripheral gap

Abstract

A method for filling limiting of a fabricated structure peripheral gap, comprising: adhering a bag (2) to an adhesive channel on the upstream face of a component to be mounted; injecting a slurry (7) into the bag (2) from a grouting opening (8) of the bag (2), the bag (2) gradually expanding and contacting the skin of the component and the skin of an adjacent object under the filling of the slurry (7); further pressurizing and grouting until the bag (2) expands a target area in place, and then sealing the grouting opening of the bag (2); and the slurry in the bag (2) being solidified and forming a slurry solidified body which completely forms a tightly attached solidified body according to the contour between the component and the adjacent object. According to the method, limited area grouting and directional grouting can be carried out; rapid solidification of a small volume of slurry can be achieved, and coordinated deformation between the component and an adjacent surrounding rock or structure can be rapidly achieved; at the same time, flexible limiting of the spatial orientation of the assembled component is achieved; and grouting pressure is completely controllable, the grouting requirements of various fabricated structure forms are met, and the method is particularly suitable for rapid construction of an underground cavern fabricated structure.

Description

Grouting bag device and method for filling gaps around position-limiting assembled structures Technical Field

[0001] The present invention relates to the technical field of construction engineering, and in particular to a grouting bag device and method for filling gaps around a limited assembled structure, which is particularly suitable for the rapid construction of large underground cavern assembled structures. Background Art

[0002] During the construction of underground prefabricated structures, certain construction gaps will be reserved between the prefabricated lining structure and the ground, and between the prefabricated internal structure and the lining structure. In order to ensure the continuity and structural stability during the structural assembly process, the construction gaps need to be filled and grouted in time after the assembly operation is completed.

[0003] Traditional filling methods use a grouting pump or shotcrete device to fill the gaps in one go. Behind-the-wall grouting, a common method used in shield tunneling, also falls into this category of filling and positioning techniques. Because the area behind the shield tunnel lining requires grouting in a relatively closed area, direct injection of slurry via a grouting pump allows for rapid contact between the lining and the ground, providing support and ensuring tunnel lining stability.

[0004] However, when using open assembly technology to construct structures, the reserved gap behind the structure is open, making it impossible to achieve a one-time grouting filling similar to shield tunneling. The perimeter of the prefabricated lining must be sealed before traditional grouting can be performed. This process takes a long time, requires a long concrete setting time, and involves many steps, making it difficult to achieve the requirements for rapid and stable prefabricated structures. The main problems are as follows:

[0005] 1. The cross-section of the underground structure is relatively complex, and it is difficult to achieve standardized sealing operations between the cross-section and the stratum.

[0006] 2. After the gaps are filled with slurry, the assembled structure may float beyond its limit or deform due to the influence of the liquid mechanical properties, which increases the difficulty of spatial posture positioning and control of the assembled structure.

[0007] 3. During the grouting process, the grouting pressure itself will cause excessive deformation of the assembled structure; at the same time, the surrounding rock environment is complex, and the slurry may expand unlimitedly in the surrounding rock cracks, making it difficult to determine the grouting range and difficult to control the grouting pressure and grouting volume.

[0008] 4. In the case of large-scale grouting, the slurry cannot solidify quickly, making the assembly efficiency and slurry solidification time the main contradiction. If the total amount of grouting each time is reduced, the number of sealing section operations will inevitably need to be increased, which will also affect the construction efficiency.

[0009] 5. Traditional grouting technology easily produces excess waste slurry, and the discharge of waste slurry will cause many environmental pollution problems.

[0010] As the application areas of prefabricated underground structure construction continue to expand, various prefabricated lining structures and prefabricated internal structures are facing various forms of flexible and large-scale rapid filling requirements of filling limiting technologies.

[0011] Obviously, traditional grouting technology can no longer meet the above needs. To this end, in view of the above defects, the designers of the present invention have devoted themselves to research and design, and integrated the experience and achievements of many years in related industries to research and design a grouting bag device and method for filling the gaps around the limited assembled structure to overcome the above defects.

[0012] Summary of the Invention

[0013] The purpose of the present invention is to provide a grouting bag device and method for filling the gaps around limited prefabricated structures, which can effectively overcome the defects of the existing technology and can perform limited area grouting and directional grouting; can achieve rapid solidification of small volumes of slurry, and quickly achieve coordinated deformation between components and adjacent surrounding rocks or structures; at the same time, achieve flexible adjustment of the spatial posture of assembled components; the grouting pressure is fully controllable and suitable for the grouting needs of various prefabricated structural forms; it helps to construct prefabricated structures efficiently, is environmentally friendly and clean, and is conducive to giving full play to the advantages of prefabricated structure construction technology, without the need for peripheral closure, achieving rapid filling, rapid support and limitation of the structural system and overall stability.

[0014] To achieve the above-mentioned object, the present invention discloses a method for filling the gap around a position-limiting assembled structure, which is characterized by comprising the following steps:

[0015] Step 1: Adhere the bag to the adhesive groove on the water-facing surface of the component to be installed;

[0016] Step 2: Use the installation trolley to install the components in order;

[0017] Step 3: After the components to be installed are installed in place, the longitudinal tensioning rod is passed through the longitudinal tensioning hole and longitudinally penetrates the components to connect with the previous group of components, so that the current group of assembled components and the previous group of components are longitudinally tensioned and locked;

[0018] Step 4: After the component to be installed is positioned and tensioned and locked by the installation trolley, the slurry is injected into the bag through the grouting port of the bag. The bag gradually expands under the filling of the slurry and contacts the outer skin of the component and the outer skin of the adjacent object;

[0019] Step 5: Further pressurized grouting is performed, and the bag expands against the outer skin of the component and the outer skin of the adjacent object, while expanding in the gap between them until the bag expands the target area into place, and then the grouting port of the bag is sealed;

[0020] Step 6: The slurry in the bag solidifies and forms a solid body, which completely conforms to the contours of the component and the adjacent objects. After an effective force transmission path is achieved, the installation trolley positioning auxiliary measures are removed.

[0021] Step 7: Repeat steps 1 to 6 to continue assembling the next component until all prefabricated components are assembled.

[0022] Among them: it also includes step eight: after the assembly of a ring component is completed, under the condition of temporary support and top support, the synchronous grouting of multiple groups of bags in a ring component is realized, and the synchronous positioning of multiple groups of grouting bags on the ring component is realized. After the grouting of the ring bag is completed and solidified, the cycle of assembling the next ring component-temporary support and top support-bag grouting is carried out.

[0023] Among them, the elastic modulus of the bag, the thickness of the bag and the grouting slurry pressure must satisfy the following relationship:

[0024] The first stage: The bag material supports the slurry to expand to the surrounding rock or adjacent surface, and the slurry is in liquid state to achieve close contact to the critical position, which needs to satisfy formula (1):

[0025] t——capsule wall thickness;

[0026] ρ——slurry density;

[0027] h——grouting thickness;

[0028] E(t i )——Elastic modulus of the bladder (related to the bladder wall thickness);

[0029] t i ——The thickness of the capsule wall at a certain stage (t-Δt);

[0030] ξ——bag material effect coefficient;

[0031] The second stage: After the bag material is in close contact with the surrounding rock or adjacent surface, when the grouting pressure is applied and diffused, the expansion in the gap must satisfy the following formula (2):

[0032] Δt——change in bag wall thickness;

[0033] ——Bag deformation effect coefficient;

[0034] Δp - grouting pressure increment for bag expansion;

[0035] Therefore, to achieve the functions of the above two stages, the bag material needs to satisfy the following formula (3):

[0036] Among them, Δt / t must meet the crack resistance index requirements of the bag material.

[0037] Among them: the bag is pre-installed in the reserved groove on the surface of the component by a pre-adhesive installation method, or a post-installation method is adopted, in which an integrated push rod is set inside the bag, and the bag is pushed into the installation position in time after the component is installed in place.

[0038] Among them: the grouting material filled in the bag has a micro-expansion property, and the volume of the slurry will not shrink after solidification, and reinforcing agents or quick-setting agents are added according to different strength requirements and solidification time.

[0039] Also disclosed is a grouting bag device for filling the peripheral gaps of a position-limiting assembled structure, which is used in the above-mentioned method of filling the peripheral gaps of a position-limiting assembled structure and is characterized in that it includes a bag, which is a thin bag-shaped object with a single-hole grouting port, and is an internal vacuum bag.

[0040] Wherein: the bladder bag is made of elastic rubber.

[0041] Among them: a material resistance enhancement design is made on the local inner wall of the bladder. The material resistance enhancement design is to improve the deformation resistance of this area of ​​the bladder wall. When grouting and filling, the bladder will guide the slurry to extend and expand to the bladder with low pressure resistance, thereby realizing directional grouting of the bladder.

[0042] Wherein: the bag is provided with an overflow port to observe the component posture during the grouting process. If the support top of the bag exceeds the component positioning standard, slurry overflows from the overflow port to adjust the component posture to the target state, and then the grouting port and the overflow port are closed.

[0043] Among them: a three-dimensional mesh is set in the bag. When the slurry is filled into the bag, it will be relatively dispersed by the three-dimensional mesh, so that the slurry can solidify faster; at the same time, the reinforcement effect of the three-dimensional mesh on the grouting body increases the strength of the grouting body.

[0044] From the above, it can be seen that the grouting bag device and method for filling the gap around the limited assembled structure of the present invention have the following effects:

[0045] 1. The thin bag-like object formed by vacuum has both high elasticity and high toughness. The wall thickness can be designed and determined according to the grouting strength requirements. When the bag is filled with grouting, the slurry gradually expands in the gap between the component and the adjacent objects under the wrapping of the bag wall until the slurry wrapped by the bag is fully and closely attached to the component and the adjacent objects in the limited area. At the same time, since the relationship between the grouting pressure and the bag wall thickness parameters are designed for the bag device, the wrapping force formed by the bag wall on the slurry will not cause the slurry to be squeezed and accumulated locally, and therefore will not cause the slurry to float or deform the component.

[0046] 2. The slurry filled in the bag solidifies quickly to form strength. The solidified grouting body is fully and tightly attached to the component and the adjacent objects, so that the internal force of the component and the adjacent objects is directly transmitted through the solidified slurry body, and at the same time the component and the adjacent objects are deformed in a coordinated manner.

[0047] The details of the present invention can be found in the following description and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 shows a schematic diagram of a position-limiting filling grouting method in the assembly process of a prefabricated structure according to the present invention.

[0049] FIG2 shows a schematic diagram of a grouting bag device for filling a gap around a position-limiting assembled structure according to the present invention.

[0050] 3A , 3B and 3C are schematic diagrams showing the filling and limiting of the gap around the filling and limiting assembled structure by the grouting bag device of the present invention.

[0051] FIG4 shows a schematic diagram of the filling of a grouting bag device for filling a gap around a position-limiting assembled structure according to the present invention.

[0052] 5A and 5B are schematic diagrams showing the relationship between the bag wall thickness and the grouting pressure control in the first and second stages of the present invention. DETAILED DESCRIPTION

[0053] 1 to 4 , there are shown a grouting bag device and method for filling a gap around a position-limiting assembled structure according to the present invention.

[0054] As shown in FIG1 , the method for filling the gap around the position-limiting assembled structure of the present invention comprises the following steps:

[0055] Step 1: Adhere the bag 2 (the inner space of the bag 2 is in a vacuum state before grouting) to the adhesive groove 9 (i.e., the adhesive surface) on the water-facing surface of the component n to be installed according to design requirements, as shown in Figures 1 and 3A.

[0056] Step 2: Use the installation trolley to install the components n in order.

[0057] Step 3: After the components n to be installed are installed in place, the longitudinal tensioning rod is passed through the longitudinal tensioning hole 11 to longitudinally penetrate the component n and connect with the previous group of components n, so that the current group of assembled components n and the previous group of components n are longitudinally tensioned and locked.

[0058] Step 4: After the component n to be installed is positioned and tensioned and locked by the installation trolley, the slurry 7 is injected into the bag 2 through the grouting port 8 of the bag 2. The bag 2 gradually expands under the slurry filling and contacts the outer skin of the component and the outer skin of the adjacent object (as shown in Figure 3B);

[0059] Step 5: Further pressurized grouting is performed, with the bag 2 expanding against the outer skin of the component n and the adjacent object 1, while simultaneously expanding within the gap between them until the bag 2 has fully expanded the target area. The grouting port 8 of the bag is then sealed (as shown in FIG3C ). (The bag 2 may be provided with an overflow port 10 to allow observation of the component n's posture during the grouting process. If the support of the bag 2 exceeds the component n's positioning standard, grout is appropriately overflowed from the overflow port 10 to adjust the component n's posture to the target state. The grouting port 8 and overflow port 10 are then sealed.)

[0060] Step 6: The slurry 7 in the bag 2 solidifies and forms a solidified body, and the solidified body of the formed slurry 7 forms a tightly fitting solidified body completely according to the contours between the component n and the adjacent object 1; after an effective force transmission path is achieved, the mounting trolley positioning auxiliary measures are removed (a temporary supporting device can also be retained as a reinforcement measure for structural stability as appropriate).

[0061] Step 7: Repeat steps 1 to 6 to continue assembling the next component until all prefabricated components are assembled (see Figure 3).

[0062] Step 8: Under the adjustment of the bag grouting coordinated control system, after a ring of components is assembled, multiple groups of bags in a ring of components can be synchronously grouted under the condition of temporary support and top support, and multiple groups of grouting bags can be synchronously limited to the ring components. After the grouting of the bags in this ring is completed and solidified, the cycle of assembling the next ring of components - temporary support and top support - bag grouting can be carried out.

[0063] 5A and 5B , when designing a grouting bag device, the bag elastic modulus, bag thickness, and grouting slurry pressure must satisfy the following relationship:

[0064] In the first stage shown in Figure 5A, the bag material supports the slurry to expand to the surrounding rock or adjacent surface, and in the liquid state of the slurry, it is necessary to satisfy formula (1) to achieve close contact to the critical position:

[0065] t——capsule wall thickness;

[0066] ρ——slurry density;

[0067] h——grouting thickness;

[0068] E(t i )——Elastic modulus of the bladder (related to the bladder wall thickness);

[0069] t i ——The thickness of the capsule wall at a certain stage (t-Δt);

[0070] ξ——Bag material effect coefficient.

[0071] In the second stage shown in FIG5B : after the bag material is in close contact with the surrounding rock or adjacent surface, when the grouting pressure is applied and diffused, the expansion in the gap must satisfy the following formula (2):

[0072] Δt——change in bag wall thickness;

[0073] ——Bag deformation effect coefficient;

[0074] Δp - grouting pressure increment for bag expansion;

[0075] Therefore, to achieve the functions of the above two stages, the bag material needs to satisfy the following formula (3):

[0076] Among them, Δt / t must meet the crack resistance index requirements of the bag material.

[0077] As shown in Figures 1 and 2, the present invention relates to a grouting bag device for filling the peripheral gap of a limited assembled structure, which includes a bag 2. The bag 2 is a thin bag with a single-hole grouting port 8, which is an internal vacuum bag.

[0078] The bladder bag can be made of elastic rubber or other airtight elastic materials, and the wall thickness of the bladder bag is determined by calculation based on factors such as grouting pressure, grouting diffusion timing and grouting range.

[0079] Before grouting the bag, the air inside should be evacuated to a vacuum state, and no vent holes are required during grouting. During grouting, the bag undergoes the following posture changes: ① When the grouting slurry is filled into the bag, the bag first expands toward both sides of the gap, gradually completing the close contact between the component and the adjacent object (or surrounding rock); ② After the bag is in close contact with the gap between the component and the adjacent object (or surrounding rock), increasing the grouting pressure will cause the bag to expand around the gap, closely adhering to both sides of the gap; ③ Because the bag is made of thin elastic material, it can freely expand toward unconstrained areas under the grouting pressure during grouting, without forming excessive pressure on the contact surface, which would cause the component to float or deform.

[0080] Specifically, the bag's internal walls are locally reinforced with material resistance. By increasing the deformation resistance of the material in different areas of the bag, the bag's elastic expansion can be limited to a certain extent, achieving directional expansion. Specifically, highly deformable materials, such as fiber mesh, are placed on the bag's internal walls, making them non-stretchable or with higher elastic resistance. During grouting, the bag guides the slurry toward areas with lower pressure resistance, thereby achieving directional grouting.

[0081] The bag can be pre-installed by placing it in a pre-reserved groove on the component surface. Alternatively, it can be installed post-installed by installing an integrated push rod inside the bag, which can be pushed into place immediately after the component is installed.

[0082] Among them, the grouting material filled in the bag can be traditional grouting material, which may contain micro-expansion properties, and the volume of the slurry will not shrink after solidification; reinforcing agents or quick-setting agents can be added according to different strength requirements and solidification time.

[0083] Among them, the bag can also be provided with an overflow port 10 to observe the component posture during the grouting process. If the support top of the bag exceeds the component positioning standard, the slurry will overflow from the overflow port appropriately to adjust the component posture to the target state, and then the grouting port and the overflow port will be closed.

[0084] Among them, based on the principle that the solidification time of the slurry is inversely proportional to the amount of the slurry, a three-dimensional mesh can also be set in the bag, so that when the slurry is filled into the bag, it will be relatively dispersed by the three-dimensional mesh, so that the slurry can solidify faster; at the same time, the reinforcement effect of the three-dimensional mesh on the grouting body increases the strength of the grouting body.

[0085] Therefore, it can be seen from the above content that the present invention adheres a bag to the adhesive groove on the water-facing surface of the component to be installed; the slurry is injected into the bag from the grouting port of the bag, and the bag gradually expands and contacts the outer skin of the component and the outer skin of the adjacent object under the filling of the slurry; the grouting is further pressurized into the bag to expand the target area into place, and then the grouting port of the bag is sealed; the slurry in the bag solidifies and forms, and the formed slurry solid body forms a close-fitting solid body completely according to the contour between the component and the adjacent object; an effective force transmission path is achieved; thus, the present invention can effectively overcome the defects of the prior art, and can perform limited area grouting and directional grouting; can achieve rapid solidification of small amounts of slurry, and quickly achieve coordinated deformation between the component and the adjacent surrounding rock or structure; at the same time, flexible adjustment of the spatial posture of the assembled component is achieved; the grouting pressure is fully controllable, and is suitable for the flexible and rapid grouting needs of various prefabricated structural forms, and is particularly suitable for the rapid construction of large underground cavern prefabricated structures.

[0086] It is obvious that the above description and description are only examples and are not intended to limit the disclosure, application or use of the present invention. Although the embodiments have been described in the embodiments and the embodiments are described in the drawings, the present invention is not limited to the specific examples illustrated in the drawings and described in the embodiments as the best mode currently believed to implement the teachings of the present invention. The scope of the present invention will include any embodiment falling within the above description and the appended claims.

Claims

1. A method for filling the gap around a limited assembled structure, characterized in that The steps include: Step 1: Adhere the bag to the adhesive groove on the water-facing surface of the component to be installed; Step 2: Use the installation trolley to install the components in order; Step 3: After the components to be installed are installed in place, the longitudinal tensioning rod is passed through the longitudinal tensioning hole and longitudinally penetrates the components to connect with the previous group of components, so that the current group of assembled components and the previous group of components are longitudinally tensioned and locked; Step 4: After the component to be installed is positioned and tensioned and locked by the installation trolley, the slurry is injected into the bag through the grouting port of the bag. The bag gradually expands under the filling of the slurry and contacts the outer skin of the component and the outer skin of the adjacent object; Step 5: Further pressurized grouting is performed, and the bag expands against the outer skin of the component and the outer skin of the adjacent object, while expanding in the gap between them until the bag expands the target area into place, and then the grouting port of the bag is sealed; Step 6: The slurry in the bag solidifies and forms a solid body, which completely conforms to the contours of the component and the adjacent objects. After an effective force transmission path is achieved, the installation trolley positioning auxiliary measures are removed. Step 7: Repeat steps 1 to 6 to continue assembling the next component until all prefabricated components are assembled.

2. The method for filling the gap around a position-limiting assembled structure according to claim 1, wherein: It also includes step eight: after the assembly of a ring component is completed, under the condition of temporary support and top support, the synchronous grouting of multiple groups of bags in a ring component is realized, and the synchronous positioning of multiple groups of grouting bags on the ring component is realized. After the grouting of the ring bag is completed and solidified, the cycle of assembling the next ring component - temporary support and top support - bag grouting is carried out.

3. The method for filling the gap around a position-limiting assembled structure according to claim 1, wherein: The elastic modulus of the bag, the thickness of the bag and the grouting slurry pressure must satisfy the following relationship: The first stage: The bag material supports the slurry to expand to the surrounding rock or adjacent surface, and the slurry is in liquid state to achieve close contact to the critical position, which needs to satisfy formula (1): t——capsule wall thickness; ρ——slurry density; h——grouting thickness; E(t i )——elastic modulus of the bladder; t i ——The thickness of the capsule wall at a certain stage (t-Δt); ξ——bag material effect coefficient; The second stage: After the bag material is in close contact with the surrounding rock or adjacent surface, when the grouting pressure is applied and diffused, the expansion in the gap must satisfy the following formula (2): Δt——change in bag wall thickness; ——Bag deformation effect coefficient; Δp - grouting pressure increment for bag expansion; Therefore, to achieve the functions of the above two stages, the bag material needs to satisfy the following formula (3): Among them, Δt / t must meet the crack resistance index requirements of the bag material.

4. The method for filling the gap around a position-limiting assembled structure according to claim 1, wherein: The bag is pre-installed in a groove reserved on the surface of the component by a pre-adhesive installation method, or is installed post-installed by setting an integrated push rod inside the bag and pushing it into the installation position in time after the component is installed in place.

5. The method for filling the gap around a position-limiting assembled structure according to claim 1, wherein: The grouting material filled in the bag has micro-expansion properties, and the volume of the slurry will not shrink after solidification. Intensifiers or quick-setting agents are added according to different strength requirements and solidification times.

6. The method for filling the gap around a position-limiting assembled structure according to claim 1, wherein: The bag is a thin bag-shaped object with a single-hole grouting port, and is an inner vacuum bag.

7. The method for filling the gap around a position-limiting assembled structure according to claim 6, wherein: The bladder is made of elastic rubber.

8. The method for filling the gap around a position-limiting assembled structure according to claim 6, wherein: A material resistance enhancement design is made on the local inner wall of the bag. The material resistance enhancement design is to improve the deformation resistance of this area of ​​the bag wall. When grouting and filling, the bag will guide the slurry to extend and expand to the part of the bag with low pressure resistance, thereby realizing directional grouting of the bag.

9. The method for filling the gap around a position-limiting assembled structure according to claim 6, wherein: The bag is provided with an overflow port to observe the component posture during the grouting process. If the support top of the bag exceeds the component positioning standard, slurry will overflow from the overflow port to adjust the component posture to the target state, and then the grouting port and the overflow port will be closed.

10. The method for filling the gap around a position-limiting assembled structure according to claim 6, characterized in that: A three-dimensional mesh is arranged in the bag. When the slurry is filled into the bag, it will be relatively dispersed by the three-dimensional mesh, so that the slurry can solidify faster. At the same time, the reinforcement effect of the three-dimensional mesh on the grouting body increases the strength of the grouting body.

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