Prefabricated weight type concrete block micro pile-anchor rod composite foundation

Abstract

The utility model relates to the technical field of electric power construction, in particular to a prefabricated weight type concrete block micro pile-anchor rod composite foundation which comprises a steel pipe type support, a plurality of concrete blocks, a plurality of anchor rods, a plurality of concrete blocks and a plurality of anchor rods. The plurality of prefabricated concrete blocks are hollow sleeves with two open ends, and are sleeved outside the steel pipe type bracket; the anchor rod is inserted into the steel pipe type support, the upper end of the anchor rod is located in the hollow part of the steel pipe type support, and the lower end of the anchor rod penetrates out of the bottom of the steel pipe type support; the grouting body is used for bonding the steel pipe type bracket, the plurality of prefabricated concrete blocks and the anchor rod into a whole; the construction method has the advantages that the weight type precast concrete blocks are adopted, full-assembly type, full-mechanical and modular construction is achieved, mountain base face zero excavation is achieved, the construction efficiency is improved, the construction period is shortened, the construction risk is reduced, and the construction quality is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of electric power construction, in particular to a precast weight type concrete block micro-pile - anchor composite foundation. Background Technique

[0002] In mountainous and hilly areas of our country, there is a geological condition where there is a 2 - 5m thick overburden on the rock layer and the lower rock layer is strongly weathered to moderately weathered rock. If dug - out foundation or dug - hole pile is adopted, generally, the pure soil conditions that meet the requirements of anti - pull and bearing stability are very few. Often, the rock layer appears before reaching the designed buried depth, and as the depth increases, the strongly weathered rock turns into moderately weathered or slightly weathered rock, resulting in great excavation difficulty, high construction cost, and the thickness of the soil body cannot meet the requirements of the designed buried depth and bearing capacity. If rock - socketed foundation is adopted, the enlarged - bottom part located in the rock layer often needs to be dug manually, with high construction risk, requiring blasting for forming, causing environmental problems, and blasting operations cannot be carried out in areas with adjacent buildings, roads, high - speed railway lines, etc. If rock - anchor foundation is adopted, the surface soil needs to be replaced, wasting the bearing capacity of the original soil, resulting in an increase in the excavation volume. And large - scale machinery has difficulties in transportation in mountainous areas, and manual excavation is difficult, and it does not meet the environmental protection requirements.

[0003] Therefore, for the "upper soil and lower rock" mountainous and hilly areas with a 2 - 5m thick overburden and underlying weathered rock, dug - out or dug - hole pile foundation is suitable for the soil body, and rock - anchor foundation is supplemented for the lower rock mass, that is, the original - soil dug - hole foundation is combined with the rock - anchor foundation to form a pile - anchor composite foundation. The existing pile - anchor composite foundations include enlarged - bottom pile - anchor composite foundation and micro - pile - anchor composite foundation. Although such foundations can give full play to the mechanical properties of such terrain conditions, the enlarged - bottom pile - anchor composite foundation still has problems of excessive excavation volume and the need for manual excavation in the construction process. When the thickness of the overlying soil layer is too large, the upper micro - piles of the micro - pile - anchor composite foundation still have the problem of large grouting volume, and even if precast micro - piles are used, there is also the problem that the length is too large and not conducive to transportation.

[0004] Based on this, this case is proposed. Content of the Utility Model

[0005] The purpose of the utility model is to provide a precast weight type concrete block micro - pile - anchor composite foundation, which realizes full - assembly, full - mechanization and modular construction, realizes zero excavation of the mountain foundation surface, improves construction efficiency, reduces construction risk and ensures construction quality.

[0006] In order to achieve the above purpose, the technical solution of the utility model is as follows:

[0007] A precast weight type concrete block micro - pile - anchor composite foundation, comprising:

[0008] A steel - pipe - type support, with openings at both ends and hollow, and a number of grouting holes are arranged on the side wall;

[0009] A number of precast concrete blocks, which are sleeve-shaped with openings at both ends and are hollow, and are sleeved outside the steel pipe-shaped support;

[0010] An anchor rod is inserted into the steel pipe-shaped support, and the upper end of the anchor rod is located inside the hollow part of the steel pipe-shaped support, and the lower end of the anchor rod passes through the bottom of the steel pipe-shaped support;

[0011] A grouting body is used to bond the steel pipe-shaped support, a number of precast concrete blocks, and the anchor rod into one body.

[0012] Furthermore, the upper end of the precast concrete block is provided with a socket part, and the lower end is provided with a socket hole that can cooperate with the socket part. A grouting seam is provided at the side wall of the socket part and the socket hole;

[0013] When the precast concrete block is sleeved outside the steel pipe-shaped support, the grouting seam corresponds to the grouting hole.

[0014] Furthermore, a support plate with an outer diameter larger than the outer diameter of the steel pipe-shaped support is fixed at the bottom of the steel pipe-shaped support. The middle part of the support plate is provided with an opening, and the opening is opposite to the hollow part of the steel pipe-shaped support. The anchor rod can pass through the opening of the support plate.

[0015] Furthermore, spiral threads are provided on the inner wall and outer wall of the steel pipe-shaped support.

[0016] The advantages of the present utility model are as follows:

[0017] 1. By using weight-type precast concrete blocks, full prefabrication, full mechanization and modular construction are realized, zero excavation of the mountain ground surface is achieved, construction efficiency is improved, construction period is shortened, construction risk is reduced, and construction quality is guaranteed;

[0018] 2. Full adaptation to the mountain terrain and geology is realized. The type of the composite foundation is not limited by the thickness of the mountain overburden layer and the mountain slope. At the same time, various mountain terrains can be adapted by adjusting the exposed height of the micro-piles and the height of the steel structure cap;

[0019] 3. By using partial grouting to connect precast concrete blocks, the problem of insufficient integrity of the current prefabricated foundation is solved. At the same time, the local pile diameter at the grouting part is enlarged, further improving the vertical uplift bearing capacity of the pile foundation; The lower bedrock adopts an anchor rod foundation, which improves the uplift bearing capacity of the composite foundation and at the same time avoids the problem of difficult drilling of the micro-pile drill bit in hard rock geology, greatly improving the construction efficiency. Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of the precast weight-type concrete block micro-pile - anchor rod composite foundation in the embodiment;

[0021] Figure 2Schematic diagram of the precast weight - type concrete block micropile in the embodiment;

[0022] Figure 3 is Figure 2 explosion schematic diagram;

[0023] Figure 4 is Figure 2 cross - sectional schematic diagram;

[0024] Figure 5 Schematic diagram of the precast weight - type concrete block micropile in the upper - soil - lower - rock terrain in the embodiment;

[0025] Figure 6 Schematic diagram of the precast weight - type concrete block micropile - anchor bolt composite foundation in the upper - soil - lower - rock terrain in the embodiment;

[0026] Figure 7 is Figure 5 on - site effect schematic diagram;

[0027] Figure 8 is Figure 6 on - site effect schematic diagram;

[0028] Label description

[0029] 1. Steel pipe - type support; 2. Precast concrete block; 3. Grouting hole; 4. Grouting seam; 5. Support plate; 6. Anchor bolt; 7. Upper overlying soil; 8. Lower rock stratum; 9. Grouting body. Specific implementation mode

[0030] The following further describes the present utility model in detail with reference to the embodiments. It should be understood that the orientation or positional relationships indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. in the text are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model.

[0031] This embodiment proposes a precast weight - type concrete block micropile - anchor bolt composite foundation, as Figures 1 to 4As shown in the figure, it includes a steel pipe type support 1, a plurality of precast concrete blocks 2, and anchor bolts 6. Among them, the steel pipe type support 1 has openings at both ends and is hollow, and a number of grouting holes 3 are provided on the side wall. The precast concrete block 2 is a sleeve type with openings at both ends and is hollow, and is used to sleeve outside the steel pipe type support 1. The upper end of the precast concrete block 2 is provided with a socket part, and the lower end is provided with a socket hole that can cooperate with the socket part to realize the plug-in combination of two adjacent upper and lower precast concrete blocks 2. At the same time, grouting seams 4 are provided at the side walls of the socket part and the socket hole. When the precast concrete block 2 is sleeved outside the steel pipe type support 1, the grouting seam 4 corresponds to the grouting hole 3. The anchor bolt 6 is inserted into the steel pipe type support 1, and the upper end of the anchor bolt 6 is located inside the hollow part of the steel pipe type support 1, and the lower end of the anchor bolt 6 passes through the bottom of the steel pipe type support 1.

[0032] After the steel pipe type support 1, the plurality of precast concrete blocks 2, and the anchor bolts 6 are installed in place, they are firmly combined into a whole by means of grouting.

[0033] As Figure 3 shown, a support plate 5 with an outer diameter larger than that of the steel pipe type support 1 is fixed at the bottom of the steel pipe type support 1. The middle of the support plate 5 is provided with an opening, and the opening is directly opposite to the hollow part of the steel pipe type support 1. The anchor bolt 6 can pass through the opening of the support plate 5. The setting of the support plate 5 has the following effects: when the steel pipe type support 1 is placed into the micropile hole, through the support plate 5, the steel pipe type support 1 can stand upright at the bottom of the hole without tilting. At the same time, after the grouting is completed, the support plate 5 can also act as an anchor plate to improve the uplift bearing capacity of the composite pile.

[0034] Preferably, spiral threads are provided on the inner wall and outer wall of the steel pipe type support 1 to improve the bonding force between the steel pipe type support 1 and the grouting liquid, thereby further improving the uplift bearing capacity.

[0035] This precast weight type concrete block micropile - anchor bolt 6 composite foundation is mainly applied to the terrain with soft soil on the upper part and rock on the lower part, and specifically includes the following steps:

[0036] S1. Use the micropile drill bit of the modular drill to drill a micropile hole, and the drilling penetrates into the lower rock layer;

[0037] S2. Place the steel pipe type support 1 with a steel support plate 5 at the bottom into the micropile hole, and sleeve a number of precast concrete blocks 2 outside the steel pipe type support 1, as Figure 5 and Figure 7 shown;

[0038] S3. Take the hollow part of the steel pipe type support 1 as the guide hole, and use the anchor bolt drill bit of the modular drill to form the lower anchor bolt hole, forming an anchor bolt hole directly below the micropile hole;

[0039] S4. Insert the full-length anchor rod 6 from the upper end of the hollow part of the steel pipe support 1, and the lower end of the anchor rod 6 reaches the bottom of the anchor rod hole;

[0040] S5. Grout from the top opening of the steel pipe support 1. The grouting liquid flows out from the grouting holes 3 and the grouting seams 4, and grout the gaps such as inside the anchor rod hole, between the micropile hole and the precast concrete block 2, and between the precast concrete block 2 and the steel pipe support 1, etc., to bond the steel pipe support 1, several precast concrete blocks 2, and the anchor rod 6 into one body and take root in the terrain with soil on the top and rock on the bottom, as Figure 6 and Figure 8 shown.

[0041] The above embodiments are only used to explain the concept of the present invention, rather than limiting the protection scope of the rights of the present invention. Any non-substantive modification made to the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. A prefabricated weight concrete block micropile-anchor composite foundation, characterized in that: include: The steel tube type bracket is open at both ends and hollow, and a number of grouting holes are opened on the side wall; If the concrete block is made of steel, it is a hollow sleeve with two ends open, and is sleeved outside the steel pipe bracket; An anchor rod is inserted into the steel tube type support, and the upper end of the anchor rod is located in the hollow part of the steel tube type support, and the lower end of the anchor rod passes through the bottom of the steel tube type support; The grouting body is used to bond the steel pipe support, several precast concrete blocks and anchor rods into one body.

2. A prefabricated weight concrete block micropile-anchor composite foundation as claimed in claim 1, characterized in that: The upper end of the precast concrete block is provided with a plug-in portion, and the lower end is provided with a plug-in hole that can be matched with the plug-in portion, and a grouting joint is opened at the side wall of the plug-in portion and the plug-in hole; When the prefabricated concrete block is sleeved outside the steel pipe type support, the grouting seam corresponds to the grouting hole.

3. The prefabricated weight concrete block micropile-anchor composite foundation according to claim 1, characterized in that: A support plate with an outer diameter larger than that of the steel tube bracket is fixed at the bottom of the steel tube bracket. A hole is opened in the middle of the support plate and the hole is opposite to the hollow part of the steel tube bracket. The anchor rod can pass through the hole of the support plate.

4. The prefabricated weight concrete block micropile-anchor composite foundation according to claim 1, characterized in that: The inner wall and the outer wall of the steel tube bracket are provided with spiral patterns.

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