CN114232654A - Slope protection and reinforcement construction method - Google Patents
Slope protection and reinforcement construction method Download PDFInfo
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- CN114232654A CN114232654A CN202111681386.3A CN202111681386A CN114232654A CN 114232654 A CN114232654 A CN 114232654A CN 202111681386 A CN202111681386 A CN 202111681386A CN 114232654 A CN114232654 A CN 114232654A
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- 238000010276 construction Methods 0.000 title claims abstract description 51
- 230000002787 reinforcement Effects 0.000 title claims abstract description 32
- 239000004567 concrete Substances 0.000 claims abstract description 42
- 239000011449 brick Substances 0.000 claims abstract description 32
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 30
- 238000005507 spraying Methods 0.000 claims abstract description 30
- 239000011378 shotcrete Substances 0.000 claims abstract description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 26
- 239000010959 steel Substances 0.000 claims abstract description 26
- 238000005553 drilling Methods 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 20
- 239000004570 mortar (masonry) Substances 0.000 claims description 20
- 239000011435 rock Substances 0.000 claims description 15
- 239000004568 cement Substances 0.000 claims description 13
- 239000011431 lime mortar Substances 0.000 claims description 11
- 238000009412 basement excavation Methods 0.000 claims description 10
- 238000004140 cleaning Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 230000008569 process Effects 0.000 claims description 10
- 238000004804 winding Methods 0.000 claims description 10
- 239000007921 spray Substances 0.000 claims description 8
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 7
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 7
- 239000004571 lime Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 230000000903 blocking effect Effects 0.000 claims description 4
- 239000006071 cream Substances 0.000 claims description 4
- 238000013461 design Methods 0.000 claims description 4
- 238000009792 diffusion process Methods 0.000 claims description 4
- 239000011440 grout Substances 0.000 claims description 4
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 claims description 2
- 230000011218 segmentation Effects 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
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- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
- E02D2300/002—Concrete
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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Abstract
The application discloses a slope protection and reinforcement construction method. The slope protection and reinforcement construction method comprises the following steps: dividing the old bridge abutment taper slope into N sections from top to bottom according to the designated vertical height; the top-down carries out reinforcement treatment to every segmentation in proper order, includes: excavating an old bridge abutment taper slope to expose a slope surface; installing anchor rods on the excavated exposed slope surface, wherein the plurality of installed anchor rods are uniformly distributed on the slope surface; hanging a steel bar mesh on the slope surface provided with the anchor rod, so that the steel bar mesh covers the slope surface, and the steel bar mesh is fixed on the anchor rod; spraying concrete on the slope surface on which the reinforcing mesh is hung, so that the anchor rods and the reinforcing mesh are covered by the concrete, and a shotcrete surface is formed on the slope surface; and after the lowest subsection is reinforced, building a brick wall on the shotcrete surface for supporting. The application solves the technical problem of how to perform slope protection reinforcement after dismantling the frustum conical slope of the old bridge abutment in wide bridge construction in the related art.
Description
Technical Field
The application relates to the technical field of bridge engineering, in particular to a slope protection and reinforcement construction method.
Background
With the development of social economy, the traffic infrastructure design and construction industry is greatly developed, road traffic networks are more and more complex, road widening and direct connection construction is more and more, in addition, the construction scale and the road grade standard of the original road cannot meet the requirements of current social traffic, and bridge widening construction tends to be more and more normalized when the original road is reconstructed and expanded.
When the wide splicing bridge is constructed, the original road (old road) is generally required to be kept through, the abutment taper slope of the old road is required to be removed when the new wide splicing bridge is constructed, then the upper structure of the bridge is subjected to wide splicing construction, and after the construction is finished, the construction of the new bridge abutment taper slope is carried out. However, since the abutment tapered slope is the tapered slope arranged on both sides of the abutment to protect the stability of the bridge and the roadbed of the road and prevent scouring, after the old bridge abutment tapered slope is removed, the abutment side of the old bridge and the roadbed side slope beside the abutment are exposed, and in addition, the old bridge needs to be ensured to operate, the effect of external loads such as automobile pressure and the like in the process of ensuring operation can make the old bridge abutment unstable and the roadbed side slope beside the bridge unstable, possibly leading the old bridge abutment and the roadbed to collapse, and bringing about certain potential safety hazard. Therefore, when the wide splicing bridge is constructed, after the old bridge abutment is dismantled from the tapered slope, how to perform protection and reinforcement treatment on the slope is very important to ensure the stability of the slope.
Aiming at the problem of how to perform side slope protection and reinforcement after dismantling the frustum of the old bridge abutment in the construction of the split-width bridge in the related art, an effective solution is not provided at present.
Disclosure of Invention
The application mainly aims to provide a slope protection and reinforcement construction method to solve the problem of how to perform slope protection and reinforcement after dismantling a frustum slope of an old bridge abutment in wide bridge splicing construction in the related technology.
In order to achieve the purpose, the application provides a slope protection and reinforcement construction method.
The slope protection and reinforcement construction method comprises the following steps:
dividing the old bridge abutment conical slope into N sections from top to bottom according to the designated vertical height, wherein N is an integer larger than 0;
sequentially reinforcing each subsection from top to bottom, comprising: excavating an old bridge abutment taper slope to expose a slope surface; drilling holes in a quincunx shape on the slope surface, wherein the deviation of the drilled holes is not more than 10cm, the deviation value of the depth of the drilled holes is not more than +/-50 mm, and the hole axis direction of the drilled holes is vertical to the slope surface; for each drilling hole, cleaning the residual rock powder in the drilling hole after finishing the hole, and plugging the hole opening of the drilling hole; when the anchor rod is installed in the drilled hole, the blocking of the orifice of the drilled hole is opened, and the anchor rod is installed in the drilled hole, wherein a plurality of installed anchor rods are uniformly arranged on the slope surface, and the depth of the anchor rod inserted into the drilled hole is not less than 95% of the designed length; and grouting the anchor rod after the anchor rod is installed, wherein the grouting ratio is 1: 1, grouting under the pressure of 0.5-1.0Mpa, and the diffusion radius of the grout is not less than 0.5 m; spraying concrete on the slope surface provided with the anchor rod, hanging a steel bar mesh on the anchor rod exposed out of the concrete, covering the steel bar mesh on the slope surface, and fixing the steel bar mesh on the anchor rod; spraying concrete again on the slope surface on which the reinforcing mesh is hung, so that the anchor rods and the reinforcing mesh are covered by the concrete, and a shotcrete surface is formed on the slope surface;
and after the lowest subsection is reinforced, building a brick wall on the shotcrete surface for supporting.
Optionally, the excavating old bridge abutment taper slope to expose the slope surface includes:
excavating old bridge abutment taper slopes from top to bottom, and periodically detecting slope rate of side slopes to smooth the slope surfaces of the excavated side slopes;
and tamping the excavated bottom surface.
Optionally, for the lowermost section, the excavating old bridge abutment slope from top to bottom includes:
the method is characterized in that an excavator is adopted to dig out the old bridge abutment taper slope from top to bottom, and when the old bridge abutment taper slope is dug out to be 30cm above the bottom surface elevation, manual digging and cleaning are adopted.
Optionally, after the anchor is installed in the drilled hole, the average value of the pulling force of the anchor 28d is not less than the design value, and the minimum pulling force is not less than 0.9.
Optionally, the removing debris rock dust from the drilled hole after the finishing hole comprises:
and adopting air wind with the wind pressure between 0.2MPa and 0.4MPa to remove the residual rock powder in the drill hole.
Optionally, hang and establish reinforcing bar net piece to the stock that exposes the concrete, include:
and laying concrete sprayed on the slope surface along with the rise and fall of the slope surface, wherein the adjacent steel bar net pieces and the anchor rods are bound by binding wires.
Optionally, the shotcrete comprises:
and spraying concrete on the slope surface with the steel mesh hung thereon by adopting a wet spraying process, wherein an accelerating agent is mixed in the sprayed concrete, the distance between a spray head and a sprayed surface on the slope surface is 1.5-2.0 m, and an included angle of 5-15 degrees is formed between a spray beam and a vertical line of the sprayed surface.
Optionally, in the step of spraying concrete on the slope surface hung with the steel mesh sheets by using a wet spraying process, the concrete is sprayed from the lower part of the slope surface to the upper part of the slope surface, when the slope surface has unevenness, the concrete is firstly sprayed into the concave part for leveling and then is continuously sprayed upwards, wherein the spraying route moves in a spiral winding manner, the diameter of the winding is between 25cm and 35cm, and the next circle of sprayed concrete is pressed from 1/3 to 1/2 of the previous circle.
Optionally, the supporting the masonry brick wall on the shotcrete surface includes:
and building a brick wall outside the guniting surface by adopting a three-in-one method by adopting sintered bricks matched with cement lime mortar, wherein the age of the sintered bricks is more than 30 days, and the sintered bricks are watered and moistened 1 to 2 days before building, and the water content is 8 to 12 percent.
Optionally, the lime cream in the cement lime mortar is cured, and the mortar sinking degree of the cement lime mortar is 45 cm-55 cm.
In the embodiment of the application, a slope protection and reinforcement construction method is provided, and the method comprises the following steps: dividing the old bridge abutment conical slope into N sections from top to bottom according to the designated vertical height, wherein N is an integer larger than 0; sequentially reinforcing each subsection from top to bottom, comprising: excavating an old bridge abutment taper slope to expose a slope surface; drilling holes in a quincunx shape on the slope surface, wherein the deviation of the drilled holes is not more than 10cm, the deviation value of the depth of the drilled holes is not more than +/-50 mm, and the hole axis direction of the drilled holes is vertical to the slope surface; for each drilling hole, cleaning the residual rock powder in the drilling hole after finishing the hole, and plugging the hole opening of the drilling hole; when the anchor rod is installed in the drilled hole, the blocking of the orifice of the drilled hole is opened, and the anchor rod is installed in the drilled hole, wherein a plurality of installed anchor rods are uniformly arranged on the slope surface, and the depth of the anchor rod inserted into the drilled hole is not less than 95% of the designed length; and grouting the anchor rod after the anchor rod is installed, wherein the grouting ratio is 1: 1, grouting under the pressure of 0.5-1.0Mpa, and the diffusion radius of the grout is not less than 0.5 m; spraying concrete on the slope surface provided with the anchor rod, hanging a steel bar mesh on the anchor rod exposed out of the concrete, covering the steel bar mesh on the slope surface, and fixing the steel bar mesh on the anchor rod; spraying concrete again on the slope surface on which the reinforcing mesh is hung, so that the anchor rods and the reinforcing mesh are covered by the concrete, and a shotcrete surface is formed on the slope surface; and after the lowest subsection is reinforced, building a brick wall on the shotcrete surface for supporting. Like this, divide the segmentation earlier, will excavate the old bridge abutment conical slope and excavate again and remove, later, through installing the stock on the domatic that exposes, hang the mode of establishing reinforcing bar net piece and spray concrete and carry out the reinforcement support construction to old bridge side slope to through building brick wall in the shotcrete face and strut, make piece together wide bridge construction old bridge abutment conical slope and demolish the extremely high supporting construction of safe coefficient after having, can effectually guarantee the stability of old bridge abutment and next door road bed side slope, especially under the circumstances of old bridge floor fender operation, can ensure bridge floor and operation system's safety. And then solved and pieced together wide bridge construction old bridge abutment taper slope and demolish the technical problem how to carry out the slope protection and reinforcement among the relevant technology.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, serve to provide a further understanding of the application and to enable other features, objects, and advantages of the application to be more apparent. The drawings and their description illustrate the embodiments of the invention and do not limit it. In the drawings:
fig. 1 is a flowchart of a slope protection and reinforcement construction method according to an embodiment of the present application;
fig. 2 is an implementation effect diagram of a slope protection and reinforcement construction method provided by the embodiment of the application;
fig. 3 is a schematic view illustrating assembly of anchor rods and reinforcing mesh sheets in a slope protection and reinforcement method according to an embodiment of the application.
Detailed Description
In order to make the technical solutions better understood by those skilled in the art, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only partial embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that the terms "first," "second," and the like in the description and claims of this application and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be used. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
In this application, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings. These terms are used primarily to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meaning of these terms in this application will be understood by those of ordinary skill in the art as appropriate.
Furthermore, the terms "disposed," "provided," "connected," "secured," and "sleeved" are to be construed broadly. For example, "connected" may be a fixed connection, a detachable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In addition, the term "plurality" shall mean two as well as more than two.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 to 3, an embodiment of the present application provides a slope protection and reinforcement construction method, including the following steps 100 to 300:
100, dividing the old bridge abutment conical slope 1 into N sections from top to bottom according to the designated vertical height, wherein N is an integer greater than 0;
the designated vertical height can be set manually, for example, the designated vertical height is 8 meters, when the total height of the old bridge abutment slope 1 is 15 meters, then the slope 1 is divided into 2 sections, the vertical height of one section is 7 meters, and the vertical height of the other section is 8 meters.
200, sequentially reinforcing each segment from top to bottom, comprising: excavating an old bridge abutment taper slope 1 to expose a slope surface 2; drilling holes in a quincunx shape on the slope surface 2, wherein the deviation of the drilled holes is not more than 10cm, the deviation value of the depth of the drilled holes is not more than +/-50 mm, and the hole axis direction of the drilled holes is vertical to the slope surface 2; for each drilling hole, cleaning the residual rock powder in the drilling hole after finishing the hole, and plugging the hole opening of the drilling hole; when the anchor rod 3 is installed in the drilled hole, the blocking of the orifice of the drilled hole is opened, and the anchor rod 3 is installed in the drilled hole, wherein the installed anchor rods 3 are uniformly distributed on the slope surface 2, and the depth of the anchor rod 3 inserted into the drilled hole is not less than 95% of the designed length; and grouting the anchor rod 3 after the anchor rod 3 is installed, wherein the grouting ratio is 1: 1, grouting under the pressure of 0.5-1.0Mpa, and the diffusion radius of the grout is not less than 0.5 m; spraying concrete on the slope surface 2 provided with the anchor rod 3, hanging a steel mesh 4 on the anchor rod 3 exposed out of the concrete, covering the steel mesh 4 on the slope surface 2, and fixing the steel mesh 4 on the anchor rod 3; and spraying concrete again on the slope surface 2 hung with the reinforcing mesh 4 to enable the concrete to cover the anchor rods 3 and the reinforcing mesh 4 and form a shotcrete surface 5 on the slope surface 2.
The old bridge abutment slope 1 can be excavated by adopting a mechanical or manual mode, so that the slope surface 2 below the old bridge abutment slope 1 is exposed. When the old bridge abutment taper slope 1 is excavated, attention needs to be paid to excavation according to the slope surface 2 slope rate of the designed side slope, and the excavated slope surface 2 is ensured to be smooth, so that subsequent construction is facilitated.
Wherein, a plurality of stock 3 of evenly installing on the domatic 2 of the back bare exposure of excavating can provide fixed mounting point for other supporting construction, is convenient for fix other supporting construction stability on domatic 2. The pitch of the anchor rods 3 arranged in a quincunx shape can be 1.2 x 1.2m, the length of the anchor rods 3 can be 1m, the diameter of the anchor rods 3 can be 22mm, a rock drill is used for drilling, a drill bit is used for drilling an orifice repeatedly back and forth during drilling, the inclination angle and the hole position of the drilled hole are guided, an inclinometer is used for measuring a chassis or a drill rod of the drilling machine during drilling of the drilled hole, the angle of the drilling machine is adjusted at any time, and errors of the drilling machine in hole position deviation caused by stratum hardness change or uneven broken surface during drilling are avoided. After each drilling final hole, should clear away downthehole residue rock powder before 3 anchor rods, clear up and use braided bag or stone behind the hole with the drill way jam, avoid other debris to fall into in the work progress and clear away clean drilling. Wherein, hang on stock 3 and establish reinforcing bar net piece 4, can fix the position of every reinforcing bar net piece 4 to make reinforcing bar net piece 4 cover on domatic 2.
Wherein, two shotcretes for the concrete covers stock 3 and reinforcing bar net piece 4, and stock 3 and reinforcing bar net piece 4 can play the effect of skeleton in the structure that the concrete formed, improve bulk strength.
300, building brick walls 6 on the guniting surface 5 for supporting.
Wherein, the brick wall 6 is built outside the guniting surface 5 to assist in supporting the whole structure formed by the concrete, the anchor rod 3 and the reinforcing mesh 4, and reinforce the whole supporting structure.
Specifically, the segmentation is carried out firstly, old bridge abutment slope 1 is excavated, then, the anchor rod 3 is installed on the exposed slope surface 2, the reinforcing mesh piece 4 and the sprayed concrete are hung to reinforce and support the old bridge slope, and the brick wall 6 is built on the guniting surface 5 to support, so that the old bridge abutment slope 1 after being constructed by splicing the wide bridge has a supporting structure with a very high safety coefficient after being dismantled, the stability of the old bridge abutment and the side roadbed slope can be effectively ensured, and particularly, the safety of the bridge floor and an operation system can be ensured under the condition that the old bridge floor is protected to be communicated with the operation. And then solved and pieced together wide bridge construction old bridge abutment conical slope 1 and demolish the technical problem how to carry out the slope protection and reinforcement among the relevant technology.
Optionally, one end of the slope 2 is located on one side of a roadbed 7, the other end of the slope 2 is delayed to one side of a bridge deck 8, and the roadbed 7 is connected with the bridge deck 8 through a bridge abutment 9.
Wherein, through domatic 2 the forming position and this side slope protection reinforced structure's overall structure for piece together wide bridge construction old bridge abutment taper slope 1 and demolish the back and have the supporting construction that the safety coefficient is extremely high, can effectually guarantee the stability of old bridge abutment and next door road bed 7 side slopes, especially under the circumstances of old bridge deck fender operation, can ensure bridge floor and operation system's safety. And then solved and pieced together wide bridge construction old bridge abutment conical slope 1 and demolish the technical problem how to carry out the slope protection and reinforcement among the relevant technology.
In one possible embodiment, excavating the old bridge abutment taper slope 1 to expose the slope surface 2 comprises:
excavating an old bridge abutment taper slope 1 from top to bottom, and periodically detecting the slope rate of a side slope so as to smooth the slope surface 2 of the excavated side slope;
and tamping the excavated bottom surface.
Specifically, the old bridge abutment taper slope 1 is excavated by the excavator, the excavator is operated from top to bottom during excavation, reverse excavation construction is forbidden (collapse may be caused by the reverse excavation construction), and during excavation construction, slope rate detection is periodically performed to ensure that the excavated slope surface 2 is smooth, so that the slope surface 2 is constructed subsequently.
In one possible embodiment, for the lowermost section, excavating the old bridge abutment slope 1 from top to bottom comprises:
the excavator is used for excavating the old bridge abutment taper slope 1 from top to bottom, and when the old bridge abutment taper slope is excavated to be 30cm above the bottom surface elevation, manual excavation and cleaning are adopted.
Specifically, when the upper structure of the old bridge abutment taper slope 1 is excavated to be 30cm above the bottom surface elevation, attention needs to be paid to avoid excessive operation of the excavator and excessive excavation of the old bridge abutment taper slope 1, so that the part below the bottom surface elevation of the old bridge abutment taper slope 1, which is 30cm, can be excavated manually, so that excavation allowance can be conveniently mastered, and accurate excavation can be realized.
In one possible embodiment, the step of cleaning the drilled hole from debris after finishing the hole comprises:
and adopting air wind with the wind pressure between 0.2MPa and 0.4MPa to remove the residual rock powder in the drill hole.
Specifically, the high-pressure air with the air pressure between 0.2MPa and 0.4MPa is adopted to remove the residual rock powder from the drill hole, so that the damage to the internal structure of the drill hole caused by a mechanical removing mode can be avoided, and the residual rock powder removing operation can be completed more efficiently.
In one possible embodiment, the hanging of the steel mesh 4 on the anchor rod 3 exposed out of the concrete includes:
concrete sprayed on the slope surface 2 is paved on the steel bar net pieces 4 along with the rise and fall of the slope surface 2, wherein the adjacent steel bar net pieces 4 and the anchor rods 3 are bound by binding wires.
Specifically, the anchor rod 3 is hung after being installed, the reinforcing mesh 4 is constructed, the reinforcing mesh 4 is laid along with the fluctuation of the sprayed surface and is tightly attached to the rock surface, and the reinforcing mesh 4 as well as the reinforcing mesh and the anchor rod 3 are bound by binding wires, so that the reinforcing mesh 4 does not shake when the concrete is sprayed in the step 400.
In one possible implementation, an example shotcrete includes:
and spraying concrete on the slope surface 2 hung with the reinforcing mesh 4 by adopting a wet spraying process, wherein an accelerating agent is mixed in the sprayed concrete, the distance between a spray head and a sprayed surface on the slope surface 2 is 1.5-2.0 m, and an included angle of 5-15 degrees is formed between a spray beam and a vertical line of the sprayed surface.
When the slope surface 2 provided with the anchor rod 3 is sprayed with concrete, the sprayed concrete is 4 cm thick, then the reinforcing steel bar net piece 4 is hung on the anchor rod 3 which is buried in advance, and the sprayed concrete with the thickness of 6 cm is re-sprayed after the reinforcing steel bar net piece 4 is hung.
In one possible embodiment, in the wet spraying process, the concrete is sprayed on the slope surface 2 hung with the steel mesh sheets 4, the concrete spraying sequence is carried out from the lower part of the slope surface 2 to the upper part, when the slope surface 2 has unevenness, the spraying is firstly carried out to level the concave position and then is continuously carried out upwards, wherein the spraying route is in a spiral winding motion, the diameter of the winding is between 25cm and 35cm, and the sprayed concrete is pressed at 1/3 to 1/2 of the previous winding.
Specifically, the sprayed concrete accelerator is an environment-friendly alkali-free accelerator. The mixing proportion of the sprayed concrete is determined through experiments, and the requirements of the design strength and the wet spraying process are met. The spraying operation should be carried out in a segmentation and slicing mode, the distance between the spray head and the sprayed surface is suitable for 1.5-2.0 m, and the included angle between the sprayed beam and the perpendicular line of the sprayed surface is optimal in a range of 5-15 degrees. The spraying sequence is carried out from bottom to top, and if the rock surface is uneven, the concave part is firstly sprayed for leveling and then the spraying is carried out upwards. The spraying route moves in a small spiral shape, the diameter of the winding is about 30cm, the former winding is pressed by the latter winding, 1/3-1/2 is pressed, and the spraying route moves in an S shape. The second row is ejected in a sequence starting from the beginning of the first row, the speed being in principle uniform and not too slow or too fast.
In one possible embodiment, step 500, masonry brick wall 6 is supported on shotcrete face 5, comprising:
and building a brick wall 6 outside the guniting surface 5 by adopting a three-in-one method by adopting sintered bricks matched with cement lime mortar, wherein the age of the sintered bricks is more than 30 days, and the sintered bricks are watered and moistened 1 to 2 days before building, and the water content is 8 to 12 percent.
Optionally, the lime cream in the cement lime mortar is cured, and the mortar sinking degree of the cement lime mortar is 45 cm-55 cm.
Specifically, after the construction of hanging net and guniting the slope surface 2 is finished, a brick wall 6 is built on the outer side of the guniting surface 5. The brick wall 6 is 240 mm thick, the MU10 sintered brick is adopted, and the masonry mortar is M5 cement lime mortar. The concrete construction method for building a brick wall 6 by adopting the sintered bricks matched with the cement lime mortar outside the guniting surface 5 through a three-in-one method is as follows: construction line laying → cleaning ground → water drenching and wetting brick → spring line → row brick → laying ash → laying brick → cleaning wall surface. The age of the brick for laying bricks is more than 30 days, and the water is watered and moistened 1 to 2 days before the laying, and the water content is 8 to 12 percent; the lime cream used must be cured. When the mortar is used for building mortar, the curing time is not less than 7 days; when the mortar is used for plastering mortar, the curing time is not less than 15 days at normal temperature, and when the mortar is used for covering a surface, the curing time is not less than 30 days. The use of lime paste containing unripe, dewatered and hardened lime is strictly prohibited; the PO42.5 bagged cement is adopted to mix mortar, the mixed mortar also has good fluidity, cohesiveness and water retention, clay-doped mortar and mixed mortar cannot be used, and the selection of cement, medium sand and lime paste and the preparation standard of the mortar are carried out according to the regulation of the regulations. The water consumption of the masonry mortar is strictly controlled during construction, the mortar immersion degree is 45-55 cm, and the mixing proportion of the masonry mortar is determined by a laboratory. And (3) building by adopting a three-in-one method, wherein the once mortar laying length is not more than 500 mm, the brick wall 6 is built by up-down staggered joints, built internally and externally, mortar joints are straight, and mortar is full.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A slope protection and reinforcement construction method is characterized by comprising the following steps:
dividing the old bridge abutment conical slope into N sections from top to bottom according to the designated vertical height, wherein N is an integer larger than 0;
sequentially reinforcing each subsection from top to bottom, comprising: excavating an old bridge abutment taper slope to expose a slope surface; drilling holes in a quincunx shape on the slope surface, wherein the deviation of the drilled holes is not more than 10cm, the deviation value of the depth of the drilled holes is not more than +/-50 mm, and the hole axis direction of the drilled holes is vertical to the slope surface; for each drilling hole, cleaning the residual rock powder in the drilling hole after finishing the hole, and plugging the hole opening of the drilling hole; when the anchor rod is installed in the drilled hole, the blocking of the orifice of the drilled hole is opened, and the anchor rod is installed in the drilled hole, wherein a plurality of installed anchor rods are uniformly arranged on the slope surface, and the depth of the anchor rod inserted into the drilled hole is not less than 95% of the designed length; and grouting the anchor rod after the anchor rod is installed, wherein the grouting ratio is 1: 1, grouting under the pressure of 0.5-1.0Mpa, and the diffusion radius of the grout is not less than 0.5 m; spraying concrete on the slope surface provided with the anchor rod, hanging a steel bar mesh on the anchor rod exposed out of the concrete, covering the steel bar mesh on the slope surface, and fixing the steel bar mesh on the anchor rod; spraying concrete again on the slope surface on which the reinforcing mesh is hung, so that the anchor rods and the reinforcing mesh are covered by the concrete, and a shotcrete surface is formed on the slope surface;
and after the lowest subsection is reinforced, building a brick wall on the shotcrete surface for supporting.
2. The slope protection and reinforcement construction method according to claim 1, wherein the excavating of the old bridge abutment cone slope to expose the slope surface comprises:
excavating old bridge abutment taper slopes from top to bottom, and periodically detecting slope rate of side slopes to smooth the slope surfaces of the excavated side slopes;
and tamping the excavated bottom surface.
3. The slope protection and reinforcement construction method according to claim 2, wherein the excavating old bridge abutment slope from top to bottom for the lowermost section comprises:
the excavator is used for excavating the old bridge abutment taper slope from top to bottom, and when the old bridge abutment taper slope is excavated to be 30cm above the bottom surface elevation, manual excavation and cleaning are adopted.
4. The slope protection and reinforcement construction method according to claim 1, characterized in that:
after the anchor rod is installed in the drilled hole, the average pulling force value of the anchor rod pulling force 28d is not less than the design value, and the minimum pulling force is not less than 0.9.
5. The slope protection and reinforcement construction method according to claim 1, wherein the step of removing the residual rock dust in the drilled hole after finishing the hole comprises the steps of:
and adopting air wind with the wind pressure between 0.2MPa and 0.4MPa to remove the residual rock powder in the drill hole.
6. The slope protection and reinforcement construction method according to claim 1, wherein the hanging of the anchor rod exposed out of the concrete with the steel mesh comprises:
and laying concrete sprayed on the slope surface along with the rise and fall of the slope surface, wherein the adjacent steel bar net pieces and the anchor rods are bound by binding wires.
7. The slope protection and reinforcement construction method according to claim 1, wherein the shotcrete comprises:
and spraying concrete on the slope surface with the steel mesh hung thereon by adopting a wet spraying process, wherein an accelerating agent is mixed in the sprayed concrete, the distance between a spray head and a sprayed surface on the slope surface is 1.5-2.0 m, and an included angle of 5-15 degrees is formed between a spray beam and a vertical line of the sprayed surface.
8. The slope protection and reinforcement construction method according to claim 7, wherein in the wet spraying process, concrete is sprayed on the slope surface hung with the steel mesh sheets, the concrete is sprayed from the lower part of the slope surface to the upper part of the slope surface in sequence, when the slope surface has unevenness, the concrete is firstly sprayed into the concave part for leveling and then is continuously sprayed upwards, wherein the spraying route moves in a spiral winding manner, the diameter of the winding is between 25cm and 35cm, and the rear circle of the sprayed concrete is pressed at 1/3 to 1/2 of the front circle.
9. The slope protection and reinforcement construction method according to claim 1, wherein the step of supporting the masonry brick wall on the shotcrete surface comprises the following steps:
and building a brick wall outside the guniting surface by adopting a three-in-one method by adopting sintered bricks matched with cement lime mortar, wherein the age of the sintered bricks is more than 30 days, and the sintered bricks are watered and moistened 1 to 2 days before building, and the water content is 8 to 12 percent.
10. The slope protection and reinforcement construction method according to claim 9, wherein the lime cream in the cement lime mortar is cured, and the mortar sinking degree of the cement lime mortar is 45cm to 55 cm.
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| CN202111681386.3A CN114232654A (en) | 2021-12-31 | 2021-12-31 | Slope protection and reinforcement construction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109281239A (en) * | 2018-10-25 | 2019-01-29 | 浙江省交通规划设计研究院有限公司 | Ribbed abutments in road operation state bore slope cutting method |
| WO2020173100A1 (en) * | 2019-02-26 | 2020-09-03 | 济南轨道交通集团有限公司 | Reinforcement apparatus and construction method for local freezing reinforcement of deep foundation pit in water-rich sand gravel stratum |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109281239A (en) * | 2018-10-25 | 2019-01-29 | 浙江省交通规划设计研究院有限公司 | Ribbed abutments in road operation state bore slope cutting method |
| WO2020173100A1 (en) * | 2019-02-26 | 2020-09-03 | 济南轨道交通集团有限公司 | Reinforcement apparatus and construction method for local freezing reinforcement of deep foundation pit in water-rich sand gravel stratum |
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Application publication date: 20220325 |