Construction method of prefabricated ground-connected wall

Abstract

The present invention provides a construction method of a prefabricated ground connection wall, and the technical scheme thereof mainly includes the following construction methods: arranging an annular groove for accommodating the annular ground connection wall; hanging prefabricated wall bricks in the annular groove in sequence, and injecting grout into the gaps between adjacent prefabricated wall bricks to form an anchoring layer, wherein the height of the prefabricated brick wall matches the depth of the annular groove, and a plurality of prefabricated wall bricks are connected end to end through the anchoring layer to form an annular ground connection wall; filling the gap between the annular ground connection wall and the annular groove with a backfill layer to complete the construction of the ground connection wall; the scheme can realize that the prefabricated ground connection wall is prevented from being spliced ​​in the height direction, thereby avoiding the generation of joints, improving the water-stopping performance in the height direction, and at the same time improving the overall strength of the prefabricated ground connection wall.

Description

Technical Field

[0001] The invention relates to the field of prefabricated ground-connected wall construction, and in particular to a construction method of a prefabricated ground-connected wall. Background Art

[0002] The gravity anchors of suspension bridges are usually buried underground. The excavation of the anchor pit requires the use of a ground-connected wall structure to support the pit. As the span of the suspension bridge becomes larger and larger, the anchor pit becomes deeper and deeper, and the bearing capacity requirements for the ground-connected wall are also getting higher and higher.

[0003] The conventional construction method of prefabricated ground diaphragm walls is to first use the first crane to lift the first prefabricated wall, and then use the second crane to stack the other prefabricated walls from bottom to top directly above the first prefabricated wall. After multiple prefabricated walls are connected to form a prefabricated ground diaphragm wall with an integral structure, the first crane lifts the prefabricated ground diaphragm wall and lowers the prefabricated ground diaphragm wall into the trench. In the above construction process, the prefabricated ground diaphragm wall is segmented in the height direction, resulting in too many joints in the prefabricated ground diaphragm wall, which is not conducive to water stopping. In addition, the prestressing treatment in this process is tensioned on site, and the construction quality is difficult to control. Summary of the invention

[0004] The purpose of the present invention is to provide a construction method for a prefabricated ground-connected wall, so as to avoid splicing the prefabricated ground-connected wall in the height direction, thereby avoiding the generation of joints, improving the water-stopping performance in the height direction, and at the same time improving the overall strength of the prefabricated ground-connected wall.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] The construction method of prefabricated ground-connected wall includes the following construction methods:

[0007] An annular groove is arranged to accommodate the annular ground connecting wall;

[0008] The prefabricated wall bricks are sequentially suspended in the annular groove, and grouting is performed in the gaps between adjacent prefabricated wall bricks to form an anchoring layer. The height of the prefabricated brick wall matches the depth of the annular groove, and multiple prefabricated wall bricks are connected end to end through the anchoring layer to form an annular ground-connected wall.

[0009] The gap between the annular ground-annular wall and the annular groove is filled with backfill layer to complete the ground-annular wall construction.

[0010] It is further provided that when the prefabricated wall bricks are sequentially suspended in the annular groove and grouting is performed in the gaps between adjacent prefabricated wall bricks to form an anchoring layer, the following construction steps are also included:

[0011] The hanging of the prefabricated wall bricks in the annular groove and the grouting in the gaps between adjacent prefabricated wall bricks to form the anchoring layer are carried out simultaneously.

[0012] It is further provided that when the hanging of the prefabricated wall bricks in the annular groove and the grouting in the gaps between adjacent prefabricated wall bricks to form the anchoring layer are simultaneously performed, the following construction steps are also included:

[0013] After hoisting three precast wall bricks, grouting began in the gaps between adjacent precast wall bricks.

[0014] It is further provided that before the prefabricated wall bricks are sequentially hung in the annular groove, the following construction steps are also included:

[0015] Make a number of prefabricated wall tiles with the same specifications and sizes, and place the finished prefabricated wall tiles at the preset lifting positions.

[0016] It is further configured that when making a plurality of prefabricated wall bricks with the same specifications and sizes, the following construction steps are also included:

[0017] Tie the steel bars, erect the formwork, pour concrete into the formwork, and consolidate the concrete and steel bars to form precast wall tiles. The precast wall tiles are demoulded after being cured until they meet the strength requirements.

[0018] It is further provided that when pouring concrete into the formwork and consolidating the concrete and the steel bars to form prefabricated wall bricks, the following construction steps are also included:

[0019] The steel bars are passed through the formwork, the steel bars are tensioned, and then the concrete is poured into the formwork.

[0020] It is further provided that when the annular groove for accommodating the annular ground connecting wall is arranged, the following construction steps are also included:

[0021] A plurality of trench sections are excavated and interconnected to form a groove.

[0022] It is further provided that after the backfill layer is filled into the gap between the annular ground connecting wall and the annular groove, the following construction steps are also included:

[0023] Vibrate the backfill layer until it is compacted.

[0024] It is further provided that the material of the anchoring layer is cement mortar, and the material of the backfill layer is sand.

[0025] It is further provided that the prefabricated wall brick is in a strip-shaped structure; the prefabricated wall brick is provided with a cavity penetrating through both ends along the height direction, and a plurality of steel bars arranged between the cavity and the outer wall of the brick body.

[0026] Compared with the prior art, the solution of the present invention has the following advantages:

[0027] 1. In the construction method of the prefabricated ground-connected wall involved in the present invention, prefabricated wall bricks whose height matches the depth of the annular groove are sequentially suspended in the brick replacement groove to avoid multi-stage stacking and splicing in the height direction. The specific connection method of adjacent prefabricated wall bricks is to inject grout into the gaps between adjacent prefabricated wall bricks, solidify the slurry to form an anchoring layer, fill the gaps between adjacent prefabricated wall bricks, and connect adjacent prefabricated brick walls. Several prefabricated wall bricks are connected end to end through the anchoring layer to form an annular ground-connected wall. The annular ground-connected wall has good water-stopping performance and connection strength in both the height direction and the horizontal direction. Finally, a backfill layer is filled between the inner side wall of the annular ground-connected wall and one side wall of the groove, and between the outer side wall and the other side wall of the groove. The backfill layer presses the annular ground-connected wall against the annular groove to complete the construction of the ground-connected wall.

[0028] 2. In the construction method of the prefabricated ground-connected wall involved in the present invention, the hoisting of prefabricated wall bricks and the grouting into the gaps between adjacent wall bricks are carried out simultaneously, thereby improving the construction efficiency. After the prefabricated wall bricks are hoisted into the annular groove, they are connected into segments through an anchoring layer, and the whole has high resistance to movement. When the prefabricated wall bricks are subsequently hoisted, the influence of the newly hoisted prefabricated wall bricks on the prefabricated wall bricks in the groove is reduced, thereby improving the operation accuracy and construction quality.

[0029] 3. In the construction method of the prefabricated ground-connected wall involved in the present invention, three prefabricated wall bricks are hung in an annular groove, and a gap is generated between the middle prefabricated wall brick and the prefabricated wall bricks on the left and right sides. When grouting is performed in the left gap, the prefabricated wall bricks on the right press against the middle prefabricated wall brick to play a positioning role. Similarly, when grouting is performed in the right gap, the prefabricated wall bricks on the left position the middle prefabricated wall bricks.

[0030] 4. In the construction method of the prefabricated ground-connected wall involved in the present invention, the prefabricated wall bricks are cast in batches in advance, which improves the quality control and operation efficiency of the ground-connected wall construction. It is preferred that they are cast in large quantities in the factory, processed into finished products and then transported to the storage point at the construction site. After the prefabricated wall bricks are cast in the factory, they are cured and formed in the factory. Compared with the prefabricated wall bricks cast and produced at the construction site, the finished product quality is better, the structural defects are reduced, and the overall strength is improved.

[0031] 5. In the construction method of the prefabricated ground-connected wall involved in the present invention, during the casting process of the prefabricated wall bricks, steel bars are embedded, and the steel bars and concrete together form the prefabricated wall bricks of the annular ground-connected wall, thereby improving the strength of a single prefabricated wall brick, and the prefabricated ground-connected wall composed of multiple prefabricated wall bricks has a higher bearing capacity.

[0032] 6. In the construction method of the prefabricated ground-connected wall involved in the present invention, the pre-tensioning method is used to prestress the steel bars, the steel bars are arranged in the template, and the two ends of the steel bars pass through the two sides of the template respectively. The steel bars are tensioned using construction tools such as jacks. During the continuous tensioning process, concrete is poured into the template. After the concrete is solidified and formed, some of the steel bars on the outside of the template are cut, and finally demolding is performed to complete the prefabricated wall brick processing.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description, which will become obvious from the following description, or may be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0035] Figure 1 A schematic diagram of a construction method of a prefabricated ground-connected wall in an embodiment of the present invention;

[0036] Figure 2 A cross-sectional view in the height direction of a prefabricated wall brick in one embodiment of the present invention;

[0037] Figure 3 A schematic diagram of splicing adjacent prefabricated wall bricks in an embodiment of the present invention;

[0038] Figure 4 A top view of an annular ground connection wall in one embodiment of the present invention;

[0039] Figure 5 The figure is a front view of an annular ground connecting wall in one embodiment of the present invention.

[0040] Figure numerals: 1. prefabricated wall bricks; 11. cavity; 12. reinforcement member; 2. backfill layer; 3. anchoring layer; 4. annular ground wall. DETAILED DESCRIPTION

[0041] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be interpreted as limiting the present invention.

[0042] like Figure 1 Combination Figure 4 , Figure 5 As shown, the present invention provides a construction method of a prefabricated ground-connected wall, comprising the following construction methods:

[0043] An annular groove is arranged to accommodate the annular ground connecting wall 4;

[0044] The prefabricated wall bricks 1 are sequentially suspended in the annular groove, and grouting is performed in the gaps between adjacent prefabricated wall bricks 1 to form an anchoring layer 3. The height of the prefabricated brick wall matches the depth of the annular groove, and multiple prefabricated wall bricks 1 are connected end to end through the anchoring layer 3 to form an annular ground connection wall 4.

[0045] The gap between the annular ground connecting wall 4 and the annular groove is filled with the backfill layer 2 to complete the construction of the ground connecting wall.

[0046] The implementation effect is that prefabricated wall bricks 1 whose height matches the depth of the annular groove are hung in sequence in the brick replacement groove to avoid multi-stage stacking and splicing in the height direction. The specific connection method of adjacent prefabricated wall bricks 1 is to inject grout into the gaps between adjacent prefabricated wall bricks 1, and the slurry solidifies to form an anchoring layer 3. The anchoring layer 3 fills the gaps between adjacent prefabricated wall bricks 1 and connects adjacent prefabricated brick walls. Several wall bricks are connected end to end through the anchoring layer 3 to form an annular ground connecting wall 4. The annular ground connecting wall 4 has good water-stopping performance and connection strength in both the height direction and the horizontal direction. Finally, the backfill layer 2 is filled between the inner wall of the annular ground connecting wall 4 and one side wall of the groove, and the outer wall and the other side wall of the groove. The backfill layer 2 presses the annular ground connecting wall 4 tightly in the annular groove to complete the ground connecting wall construction.

[0047] In the specific construction, when the prefabricated wall bricks 1 are sequentially hung in the annular groove and grouting is performed in the gaps between adjacent prefabricated wall bricks 1 to form the anchoring layer 3, the following construction steps are also included:

[0048] The hanging of the prefabricated wall bricks 1 in the annular groove and the grouting of the gaps between adjacent prefabricated wall bricks 1 to form the anchoring layer 3 are performed simultaneously.

[0049] The hoisting of precast wall tiles 1 and grouting into the gaps between adjacent wall tiles are carried out simultaneously, which improves the construction efficiency. After the precast wall tiles 1 are hoisted into the annular groove, they are connected into segments through the anchoring layer 3, and the whole has high resistance to movement. When the precast wall tiles 1 are subsequently hoisted, the influence of the newly hoisted precast wall tiles 1 on the precast wall tiles 1 in the groove is reduced, thereby improving the operation accuracy and construction quality.

[0050] In a specific operation, when the prefabricated wall bricks 1 are suspended in the annular groove and the anchoring layer 3 is formed by grouting in the gaps between adjacent prefabricated wall bricks 1, the following construction steps are also included:

[0051] After hoisting three precast wall bricks 1, grouting in the gaps between adjacent precast wall bricks 1 begins.

[0052] Three precast wall bricks 1 are hung in the annular groove, and a gap is formed between the middle precast wall brick 1 and the precast wall bricks 1 on the left and right sides. When grouting is performed in the left gap, the precast wall brick 1 on the right presses against the middle precast wall brick 1 to play a positioning role. Similarly, when grouting is performed in the right gap, the precast wall brick 1 on the left positions the middle precast wall brick 1.

[0053] Further improvement, before the prefabricated wall bricks 1 are sequentially hung in the annular groove, the following construction steps are also included:

[0054] Make multiple wall tiles of the same specifications and sizes, and place the finished wall tiles at the preset lifting positions.

[0055] Precast wall tiles 1 are cast in batches in advance to improve the quality control and operating efficiency of ground-anchored wall construction. It is preferred to cast them in large quantities in the factory, and then transport them to the storage point at the construction site after being processed into finished products. After the precast wall tiles 1 are cast in the factory, they are cured and formed in the factory. Compared with precast wall tiles 1 cast at the construction site, the finished product quality is better, structural defects are reduced, and the overall strength is improved.

[0056] The processing process of the prefabricated wall brick 1 is that when making a plurality of wall bricks of the same specifications and sizes, the following construction steps are also included:

[0057] Tie up the steel bars, erect the formwork, pour concrete into the formwork, and let the concrete and steel bars solidify to form wall bricks. The wall bricks are then demoulded after being cured until they meet the strength requirements.

[0058] During the casting process of the precast wall bricks 1, steel bars 12 are embedded, and the steel bars 12 and concrete together form the precast wall bricks 1 of the annular ground-connected wall 4, thereby improving the strength of a single precast wall brick 1 and making the precast ground-connected wall composed of multiple precast wall bricks 1 have a higher bearing capacity.

[0059] Preferably, when pouring concrete into the formwork and consolidating the concrete and the steel bars to form wall bricks, the following construction steps are also included:

[0060] The steel bars are passed through the formwork, the steel bars are tensioned, and then the concrete is poured into the formwork.

[0061] The precast wall brick 1 adopts the pre-tensioning method to prestress the steel bar 12. The steel bar 12 is arranged in the template. The two ends of the steel bar 12 pass through the two sides of the template respectively. The steel bar 12 is tensioned using construction tools such as jacks. During the continuous tensioning process, concrete is poured into the template. After the concrete is solidified and formed, part of the steel bar 12 on the outside of the template is cut, and finally demolding is performed to complete the processing of the precast wall brick 1.

[0062] In addition, the steel bar 12 may be prestressed by post-tensioning method, and this embodiment does not impose too many restrictions on this.

[0063] In actual operation, when arranging the annular groove for accommodating the annular ground connecting wall 4, the following construction steps are also included:

[0064] A plurality of groove sections are excavated and connected to each other to form the annular groove.

[0065] After digging multiple trench sections, they are interconnected to avoid concentrated force and prevent the annular trench from collapsing during digging.

[0066] Further optimization, when digging multiple trench sections, the following construction steps are also included:

[0067] Mud wall treatment is carried out on the side walls of the excavated trench section.

[0068] The inner wall strength of the annular groove is improved by using mud wall protection to avoid collapse of the annular groove after forming.

[0069] Preferably, after the backfill layer 2 is filled into the gap between the annular ground connecting wall 4 and the annular groove, the following construction steps are also included:

[0070] The backfill layer 2 is vibrated until the backfill layer 2 is in a dense state.

[0071] By vibrating the backfill layer 2, the structure of the backfill layer 2 is prevented from being loosened, and the tightening effect on the annular ground connecting wall 4 is strengthened.

[0072] Specifically, the anchoring layer 3 is made of cement mortar, and the backfill layer 2 is made of sand.

[0073] like Figure 2-3 As shown, the specific structure of the prefabricated wall brick 1 is that the prefabricated wall brick 1 is in a strip-shaped structure; the prefabricated wall brick 1 is provided with a cavity 11 running through both ends along the height direction, and a plurality of steel bars 12 arranged between the cavity 11 and the outer wall of the brick body.

[0074] The implementation effect is that the prefabricated wall bricks 1 are strip-shaped, and the ground-connected wall formed by enclosing the prefabricated wall bricks 1 has no splicing seams in the height direction, which improves the water-stopping performance. In the specific construction, the convenience and operability of connecting adjacent prefabricated wall bricks 1 are improved, thereby improving the connection quality of adjacent prefabricated wall bricks 1 and enhancing the connection strength; in addition, the prefabricated wall bricks 1 are hollowed out through the cavity 11 inside them, and steel bars 12 are arranged between the cavity 11 and the outer side of the prefabricated wall bricks 1. The prefabricated ground-connected wall using the prefabricated wall bricks 1 has the advantages of high bearing capacity and low cost, which can avoid splicing of the prefabricated ground-connected wall in the height direction and improve the water-stopping performance. At the same time, without affecting the strength of the prefabricated ground-connected wall, the weight of the prefabricated ground-connected wall is reduced, thereby reducing the construction cost.

[0075] As a further improvement, the plurality of reinforcing steel members 12 are arranged in two rows, and the two rows of reinforcing steel members 12 are arranged on both sides of the prefabricated wall brick 1 in the width direction.

[0076] The plurality of reinforcement members 12 are arranged in two rows, and the two rows of reinforcement members 12 are arranged on both sides of the prefabricated wall brick 1 in the width direction.

[0077] In another improvement, the prefabricated wall brick 1 extends in an arc shape in the length direction.

[0078] The prefabricated wall brick 1 extends in an arc shape in the length direction, that is, the prefabricated wall brick 1 is bent in an arc shape in the length direction, so that a number of prefabricated wall bricks 1 can be quickly connected end to end to form an annular ground wall 4, avoiding the need for each prefabricated wall brick 1 to be rotated separately to meet the central angle of the annular groove, and there is no need to manually control the arrangement spacing of each prefabricated wall brick 1 after rotation, thereby reducing the construction accuracy requirements and operation difficulty.

[0079] Preferably, the cavity 11 extends in an arc shape in the length direction along the arc-shaped extension path of the prefabricated wall brick 1 .

[0080] The cavity 11 is extended in an arc shape along the arc extension path of the precast wall brick 1 in the length direction, that is, the cavity 11 and the precast wall brick 1 are bent with the same arc, so that the thickness of the side wall of the cavity 11 and the outer side wall of the adjacent precast wall brick 1 remains equal, thereby improving the molding quality of the precast wall brick 1.

[0081] In practical applications, a plurality of the steel bars 12 extend along the height direction of the prefabricated wall brick 1 and are arranged at intervals along the arc-shaped extension path of the prefabricated wall brick 1 .

[0082] The steel bars 12 extend along the height direction of the precast wall brick 1, that is, the steel bars 12 are arranged longitudinally. When the precast wall brick 1 is bent in the length direction, the steel bars 12 arranged transversely relative to the steel bars 12 do not need to be bent, which is convenient for subsequent prestressing treatment of the steel bars 12 and reduces the processing difficulty; the steel bars 12 are arranged at intervals along the arc-shaped extension path of the precast wall brick 1, that is, the arrangement points of the steel bars 12 all fall on a preset arc line, and the curvature of the preset arc line is the same as the curvature of the arc-shaped extension of the precast wall brick 1, so that the force acting on the precast wall brick 1 can be evenly distributed to each steel bar 12, thereby improving the bearing effect.

[0083] In a specific implementation, the steel bar 12 is a prestressed steel bar, and the steel bar 12 is embedded in the prefabricated wall brick 1 .

[0084] This embodiment uses a pre-tensioning process to prestress the steel member 12 to improve the bearing capacity of a single prefabricated wall brick 1. In addition, a post-tensioning process can also be used to prestress the steel member 12, and this embodiment does not impose too many restrictions on this.

[0085] Preferably, the prefabricated wall bricks 1 are concrete bricks.

[0086] In specific operations, in addition to using concrete bricks as the prefabricated wall bricks 1, cement bricks and other different materials can also be used as the prefabricated wall bricks 1, and this embodiment does not impose too many restrictions on this.

[0087] The above descriptions are only partial embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A construction method of a prefabricated ground-connected wall, characterized in that: The following construction methods are included: A plurality of prefabricated wall bricks of the same specifications and sizes are produced; the prefabricated wall bricks are in a strip-shaped structure, and the height of the prefabricated brick wall matches the depth of the annular groove to avoid splicing in the height direction; the prefabricated wall bricks are provided with cavities running through both ends in the height direction, and a plurality of prestressed steel bars arranged between the cavities and the outer side walls of the brick bodies; the prefabricated wall bricks extend in an arc shape in the length direction, and the cavities and the prefabricated wall bricks are bent at the same arc, so that the thickness of the side walls of the cavities and the outer side walls of the prefabricated wall bricks remains equal at all locations; a plurality of the steel bars extend in the height direction of the prefabricated wall bricks, and are arranged at intervals along the arc extension path of the prefabricated wall bricks; An annular groove is arranged to accommodate the annular ground connecting wall; The precast wall bricks are sequentially hoisted in the annular groove, and grouting is simultaneously performed in the gaps between adjacent precast wall bricks to form an anchoring layer. After hoisting three precast wall bricks, grouting is started in the gaps between adjacent precast wall bricks. Multiple precast wall bricks are connected end to end through the anchoring layer to form an annular ground-connected wall. The gap between the annular ground-connected wall and the annular groove is filled with a backfill layer to complete the construction of the ground-connected wall. The material of the anchoring layer is cement mortar, and the material of the backfill layer is sand.

2. The construction method of the prefabricated ground-connected wall according to claim 1, characterized in that: Before the prefabricated wall bricks are sequentially suspended in the annular groove, the following construction steps are also included: Place the finished prefabricated wall tiles at the preset lifting position.

3. The construction method of the prefabricated ground-connected wall according to claim 2, characterized in that: When making a plurality of prefabricated wall bricks with the same specifications and sizes, the following construction steps are also included: Tie the steel bars, erect the formwork, pour concrete into the formwork, and consolidate the concrete and steel bars to form precast wall tiles. The precast wall tiles are demoulded after being cured until they meet the strength requirements.

4. The construction method of the prefabricated ground-connected wall according to claim 3, characterized in that: When pouring concrete into the formwork and consolidating the concrete and the steel bars to form prefabricated wall bricks, the following construction steps are also included: The steel bars are passed through the formwork, the steel bars are tensioned, and then the concrete is poured into the formwork.

5. The construction method of the prefabricated ground-connected wall according to claim 1, characterized in that: When the annular groove for accommodating the annular ground connecting wall is arranged, the following construction steps are also included: A plurality of trench sections are excavated and interconnected to form a groove.

6. The construction method of the prefabricated ground-connected wall according to claim 1, characterized in that: After the backfill layer is filled into the gap between the annular ground connecting wall and the annular groove, the following construction steps are also included: Vibrate the backfill layer until it is compacted.

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