CN211395734U - Straight anchor and group anchor composite rock anchoring foundation for power transmission tower - Google Patents
Straight anchor and group anchor composite rock anchoring foundation for power transmission tower Download PDFInfo
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- CN211395734U CN211395734U CN201922121951.5U CN201922121951U CN211395734U CN 211395734 U CN211395734 U CN 211395734U CN 201922121951 U CN201922121951 U CN 201922121951U CN 211395734 U CN211395734 U CN 211395734U
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Abstract
The utility model relates to a rock stock technical field, the current rock stock can not compromise resistance to plucking anchoring force and the advantage of convenient construction, the utility model provides a straight anchor and group anchor composite rock anchor basis for power transmission tower, including the concrete cushion cap that is used for pouring on the rock mass, the reinforcing bar net of locating in the concrete cushion cap to and be used for fixing the concrete cushion cap on the rock mass anchor rod of group anchor, the rag bolt of power transmission tower runs through the concrete cushion cap and anchors into the rock mass below; the anti-pulling anchoring force is guaranteed, the rock excavation amount can be reduced, and construction is facilitated.
Description
Technical Field
The utility model relates to a rock stock technical field, the more specifically straight anchor and the compound rock anchor basis of crowd's anchor for power transmission tower that says so mainly uses in the construction of mountain area power transmission tower.
Background
The rock anchor rod foundation is an integral transmission line foundation formed by combining anchor bars and rock bodies through cementing cement mortar or fine aggregate concrete in rock holes. The method is generally applied to power transmission lines in hilly terrains in power transmission line projects of various voltage classes in China.
At present, the common types of rock bolt foundations mainly include straight anchor type and bearing platform type. The direct-anchored rock anchor rod foundation is characterized in that an iron tower foundation bolt is used as an anchor rib and directly anchored into an anchor hole to be used as an anchor rod. Because the arrangement form of foundation bolt is generally comparatively concentrated, the ground scope of anchoring is less, and the shaft tower foundation effort that the rock stock basis of straight anchor formula was suitable for is generally less. Bearing platform formula crowd anchor basis utilizes the cushion cap to transmit basic effort for lower part stock, because the great tower position of basic effort, its rag bolt size is often great, and rag bolt anchor length in the cushion cap is longer, and the excavation volume that leads to the cushion cap is very big for rock stock basis loses its advantage itself, and the difficult transportation of regional machinery that the slope is steeper needs artifical excavation cushion cap foundation ditch, and the construction degree of difficulty is great, is unfavorable for the construction.
Therefore, a rock anchoring foundation which can ensure the uplift anchoring force, reduce the rock excavation amount and facilitate construction is urgently needed.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome the defect that exists among the above-mentioned prior art, provide a straight anchor and the compound rock anchor basis of crowd's anchor for power transmission tower, reduced rock excavation volume, convenient construction when guaranteeing resistance to plucking anchor power.
In order to achieve the above object, the utility model discloses a following technical scheme can realize: a straight anchor and group anchor composite rock anchoring foundation for a power transmission tower comprises a concrete bearing platform, a reinforcing mesh and a group anchor bolt, wherein the concrete bearing platform is poured on a rock body, the reinforcing mesh is arranged in the concrete bearing platform, the group anchor bolt is used for fixing the concrete bearing platform on the rock body, and an anchor bolt of the power transmission tower penetrates through the concrete bearing platform and is anchored into the rock body below.
Above-mentioned technical scheme through will straighten anchor formula rock stock and cushion cap formula crowd anchor mutually ingenious combination get up, both guarantee resistance to plucking anchoring power, can reduce rock excavation volume again, convenient construction.
The utility model discloses further preferred scheme does: a preformed hole for accommodating an anchor bolt is formed in the concrete bearing platform, and the diameter of the preformed hole is at least 10mm larger than that of the anchor bolt; and foundation bolts of the power transmission tower penetrate through the middle of the preformed hole, and a fine stone concrete layer is filled between the foundation bolts and the hole wall of the preformed hole.
The utility model discloses further preferred scheme does: the foundation bolt is fixedly connected with a reinforcing mesh in the concrete bearing platform in a welding mode and used for increasing the connection strength of the foundation bolt and the concrete bearing platform.
The utility model discloses further preferred scheme does: the lower section of the foundation bolt is positioned in an anchor space of a rock body, and a fine aggregate concrete filling layer is filled between the lower section of the foundation bolt and the wall of an anchor hole of the rock body.
The utility model discloses further preferred scheme does: the lower section of the group anchor rod is positioned in the anchor hole of the rock body, and a fine aggregate concrete filling layer is filled between the lower section of the group anchor rod and the wall of the anchor hole of the rock body.
The utility model discloses further preferred scheme does: the upper sections of the anchor rods of the group anchors are fixedly connected with the reinforcing mesh in the concrete bearing platform through welding, and the connecting strength of the anchor rods of the group anchors and the concrete bearing platform is increased.
The utility model discloses further preferred scheme does: the upper ends of the anchor rod groups are bent, and the bent sections are fixedly connected with the reinforcing mesh in the concrete bearing platform through welding.
The utility model discloses further preferred scheme does: and one end of the foundation bolt, which is exposed out of the concrete bearing platform, is connected with the power transmission tower foot bolt.
To sum up, the utility model discloses following beneficial effect has: the straight group combined rock anchoring foundation has the advantages of simple structure, convenient construction, simple and convenient design, reliable force transmission, reduction of the on-site rock excavation amount, reduction of the height of a bearing platform, shortening of the on-site construction period and reduction of the construction cost.
Drawings
FIG. 1 is a schematic structural view of example 1.
FIG. 2 is a schematic structural view of example 2.
In the figure: 1. a concrete cap; 11. a reinforcing mesh; 2. anchor bolts; 3. anchor group anchor rods; 31. bending the section; 4. a rock mass; 5. fine stone concrete layer.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications without inventive contribution to the present embodiment as required after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.
Example 1: as shown in fig. 1, there is shown a straight anchor and group anchor composite rock-anchored foundation for a power transmission tower, which includes a concrete cap 1 for casting on a rock mass 4, a reinforcing mesh 11 provided in the concrete cap 1, and a group anchor bolt 3 for fixing the concrete cap 1 to the rock mass 4, and an anchor bolt 2 of the power transmission tower penetrates the concrete cap 1 and is anchored into the rock mass 4 below.
A reserved hole for accommodating the anchor bolt 2 is formed in the concrete bearing platform 1, the diameter of the reserved hole is at least 10mm larger than that of the anchor bolt 2, and the reserved hole is preferably 20mm in the embodiment. The foundation bolt 2 of the power transmission tower passes through the middle of the reserved hole.
The upper section of the foundation bolt 2 is exposed out of the end part of the concrete bearing platform 1 and is connected with the foundation bolt of the power transmission tower. And a fine stone concrete layer 5 is filled between the middle section of the foundation bolt 2 and the hole wall of the reserved hole. The lower section of the foundation bolt 2 is positioned in the anchor space of the rock body 4, and a fine aggregate concrete filling layer is also filled between the lower section of the foundation bolt 2 and the wall of the anchor hole of the rock body 4.
The lower section of the group anchor rod 3 is positioned in the anchor hole of the rock mass 4, and a fine aggregate concrete filling layer is filled between the lower section of the group anchor rod 3 and the wall of the anchor hole of the rock mass 4. The concrete bearing platform 1 is poured on the upper section of the anchor rod 3 of the group anchor, and is fixed with the anchor rod 3 of the group anchor after the bearing platform is solidified.
The rock anchoring foundation in example 1 was formed by the following construction method:
(1) measuring and positioning the construction position of the rock anchor rod foundation of the power transmission tower according to a design drawing, constructing from top to bottom, cleaning sediments, pumice and other impurities on a side slope around the position where the positioning is located, excavating a bearing platform space by adopting an air pick and combining manual cooperation, and cleaning platform deposits on the bottom surface of the bearing platform after excavating to a designed elevation.
(2) And measuring and positioning the positions of anchor holes (for placing foundation bolts and anchor bolts of a group anchor), marking the central position of the anchor holes, drilling the corresponding anchor holes by using a drilling machine, and cleaning rock powder, rock debris and sediments in the holes.
(3) And (4) retesting the diameter and the distance of the anchor holes, wherein the diameter of the anchor holes and the distance of the anchor holes are selected to meet relevant regulations. The diameter of the anchor hole is 2-3 times of the diameter of the anchor bolt or the anchor rod group; the distance between the anchor holes is not less than 3 times of the diameter of the anchor holes.
(4) And (3) re-measuring the depth of the anchor hole of the group anchor in construction, wherein the depth is not less than 25 times (no weathering and slightly weathering), 35 times (medium weathering) and 45 times (strong weathering) of the diameter of the anchor rod of the group anchor.
(5) Secondary hole cleaning is carried out, hole walls are fully moistened, anchor rods (or straight anchor rods, namely foundation bolts) of the anchor group are inserted into the anchor holes one by one, the diameter of an anchor rib is not smaller than 16mm, the center of each anchor rod is coincided with the center of each anchor hole, the periphery of each anchor rod is not contacted with the rock wall, fine stone concrete is injected into a gap part between each anchor rod and each anchor hole and is densely filled, the strength grade of the concrete is not lower than C30 grade, and the fine stone concrete is uniformly stirred and is used along with stirring.
(6) Erecting a template at the position of a bearing platform, binding a reinforcing mesh, extending the top end of an anchor rod into the range of the bearing platform, pouring bearing platform concrete, reserving a hole which is 10mm larger than the diameter of the straight anchor foot bolt in the bearing platform by adopting a PVC pipe, generally taking the hole for 20mm, pulling out the PVC pipe after the concrete is initially set, and requiring the PVC pipe to be aligned with the centers of the anchor holes corresponding to the straight anchor foot bolt in the rock mass.
(7) After the bearing platform concrete reaches the designed strength, secondary hole cleaning is carried out on foundation bolt holes in the bearing platform and the rock mass, the hole walls are fully wetted, foundation bolts penetrate through reserved holes in the bearing platform and are inserted into anchor holes in the rock mass at the lower part, the periphery of the straight anchor foundation bolts is not contacted with the concrete walls and the rock walls, fine stone concrete is injected into gaps and is densely filled, and the strength grade of the concrete is not lower than grade C30.
(8) The part of the foundation bolt extending out of the top of the bearing platform is connected with the power transmission tower foot through a bolt.
Example 2: as shown in fig. 2, another embodiment of a straight anchor and group anchor composite rock bolting foundation for a transmission tower is shown. The main difference between this embodiment and embodiment 1 is that the anchor bolts 2 in this embodiment are fixedly connected with the reinforcing mesh 11 in the concrete cap 1 by welding; the upper end of the anchor group anchor rod 3 is bent and the bent section 31 is fixedly connected with the reinforcing mesh 11 in the concrete bearing platform 1 by welding. The rest of the structure and the characteristics are the same as those of the embodiment 1.
The rock anchoring base in example 2 was formed by the following construction method:
(1) measuring and positioning the construction position of the rock anchor rod foundation of the power transmission tower according to a design drawing, constructing from top to bottom, cleaning sediments, pumice and other impurities on a side slope around the position where the positioning is located, excavating a bearing platform space by adopting an air pick and combining manual cooperation, and cleaning platform deposits on the bottom surface of the bearing platform after excavating to a designed elevation.
(2) And measuring and positioning the position of the anchor hole, marking the central position of the anchor hole, drilling the corresponding anchor hole by using a drilling machine, and cleaning rock powder, rock debris and sediments in the hole.
(3) And (4) retesting the diameter and the distance of the anchor holes, wherein the diameter of the anchor holes and the distance of the anchor holes are selected to meet relevant regulations. The diameter of the anchor hole is 2-3 times of the diameter of the anchor bolt or the anchor rod group; the distance between the anchor holes is not less than 3 times of the diameter of the anchor holes.
(4) And (3) re-measuring the depth of the anchor hole of the group anchor in construction, wherein the depth is required to be not less than 25 times (no weathering and slightly weathering), 35 times (medium weathering) and 45 times of the diameter of the anchor rod of the group anchor.
(5) Secondary hole cleaning is carried out, hole walls are fully moistened, anchor rods (or straight anchor rods, namely foundation bolts) of the anchor group are inserted into the anchor holes one by one, the diameter of an anchor rib is not smaller than 16mm, the center of each anchor rod is coincided with the center of each anchor hole, the periphery of each anchor rod is not contacted with the rock wall, fine stone concrete is injected into a gap part between each anchor rod and each anchor hole and is densely filled, the strength grade of the concrete is not lower than C30 grade, and the fine stone concrete is uniformly stirred and is used along with stirring.
(6) And (3) anchoring the foundation bolt into the anchor hole in the same way, injecting fine stone concrete into the gap between the foundation bolt and the anchor hole, and filling and tamping the fine stone concrete to be compact, wherein the strength grade of the concrete is not lower than grade C30.
(7) Erecting a template at the position of a bearing platform, binding a reinforcing mesh, welding the top bending section of the anchor rod group with the reinforcing mesh of the bearing platform, welding foundation bolts with the reinforcing mesh of the bearing platform, continuously retesting the positions of the foundation bolts extending out of the top end part of the bearing platform in the welding process, wherein the error is not more than 1mm, and then pouring bearing platform concrete.
(8) The part of the foundation bolt extending out of the top of the bearing platform is connected with the upper power transmission tower foot through a bolt.
Claims (8)
1. A straight anchor and group anchor composite rock anchoring foundation for a power transmission tower comprises a concrete bearing platform (1) poured on a rock body (4), a reinforcing mesh (11) arranged in the concrete bearing platform (1), and a group anchor rod (3) used for fixing the concrete bearing platform (1) on the rock body (4), and is characterized in that an anchor bolt (2) of the power transmission tower penetrates through the concrete bearing platform (1) and is anchored into the rock body (4) below.
2. The straight anchor and group anchor composite rock-anchored foundation for a transmission tower according to claim 1, wherein: a preformed hole for accommodating the foundation bolt (2) is formed in the concrete bearing platform (1), and the diameter of the preformed hole is at least 10mm larger than that of the foundation bolt (2); the foundation bolt (2) of the power transmission tower penetrates through the middle of the reserved hole, and a fine stone concrete layer (5) is filled between the foundation bolt (2) and the hole wall of the reserved hole.
3. The straight anchor and group anchor composite rock-anchored foundation for a transmission tower according to claim 1, wherein: the foundation bolts (2) are fixedly connected with a reinforcing mesh (11) in the concrete bearing platform (1) through welding.
4. The straight anchor and group anchor composite rock-anchored foundation for a transmission tower according to claim 2 or 3, wherein: the lower section of the foundation bolt (2) is located in an anchor space of the rock body (4), and a fine aggregate concrete filling layer is filled between the lower section of the foundation bolt (2) and the wall of an anchor hole of the rock body (4).
5. The straight anchor and group anchor composite rock-anchored foundation for a transmission tower according to claim 4, wherein: the lower section of the group anchor rod (3) is positioned in the anchor hole of the rock body (4), and a fine aggregate concrete filling layer is filled between the lower section of the group anchor rod (3) and the wall of the anchor hole of the rock body (4).
6. The straight anchor and group anchor composite rock-anchored foundation for a transmission tower according to claim 3, wherein: the upper sections of the anchor rod groups (3) are fixedly connected with a reinforcing mesh (11) in the concrete bearing platform (1) through welding.
7. The straight anchor and group anchor composite rock-anchored foundation for a transmission tower according to claim 6, wherein: the upper ends of the anchor rod groups (3) are bent, and the bent sections (31) are fixedly connected with the reinforcing mesh (11) in the concrete bearing platform (1) through welding.
8. The straight anchor and group anchor composite rock-anchored foundation for a transmission tower according to claim 1, wherein: and one end of the foundation bolt (2) exposed out of the concrete bearing platform (1) is connected with a power transmission tower foot bolt.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922121951.5U CN211395734U (en) | 2019-12-02 | 2019-12-02 | Straight anchor and group anchor composite rock anchoring foundation for power transmission tower |
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| CN201922121951.5U CN211395734U (en) | 2019-12-02 | 2019-12-02 | Straight anchor and group anchor composite rock anchoring foundation for power transmission tower |
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| CN211395734U true CN211395734U (en) | 2020-09-01 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114622590A (en) * | 2022-03-18 | 2022-06-14 | 中铁广州工程局集团深圳工程有限公司 | High-steep slope circular pier column in-situ single-pile upper tower crane foundation structure and construction method |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114622590A (en) * | 2022-03-18 | 2022-06-14 | 中铁广州工程局集团深圳工程有限公司 | High-steep slope circular pier column in-situ single-pile upper tower crane foundation structure and construction method |
| CN114622590B (en) * | 2022-03-18 | 2024-01-30 | 中铁广州工程局集团深圳工程有限公司 | High-steep slope circular pier column in-situ single pile tower crane foundation structure and construction method |
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