CN116537831A - Needle beam type trolley lining construction method for small-section tunnel small-curve radius section - Google Patents
Needle beam type trolley lining construction method for small-section tunnel small-curve radius section Download PDFInfo
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- 238000010276 construction Methods 0.000 title claims abstract description 97
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims abstract description 4
- 238000005259 measurement Methods 0.000 claims description 25
- 238000007789 sealing Methods 0.000 claims description 22
- 238000013461 design Methods 0.000 claims description 17
- 238000013102 re-test Methods 0.000 claims description 9
- 238000000465 moulding Methods 0.000 claims description 8
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 238000005096 rolling process Methods 0.000 claims description 4
- 239000011248 coating agent Substances 0.000 claims description 3
- 238000000576 coating method Methods 0.000 claims description 3
- 238000007689 inspection Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 5
- 238000000034 method Methods 0.000 description 17
- 239000000463 material Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000006073 displacement reaction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D11/00—Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
- E21D11/04—Lining with building materials
- E21D11/10—Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
- E21D11/102—Removable shuttering; Bearing or supporting devices therefor
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/20—Hydro energy
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- Lining And Supports For Tunnels (AREA)
Abstract
The invention discloses a needle beam type trolley lining construction method for a small-section tunnel small-curve radius section, which comprises the following steps: constructing a straight section of the tunnel; constructing a small curve radius section of the tunnel; the construction of the tunnel small curve radius section comprises the following steps: demolding and advancing the trolley; positioning the needle beam of the trolley; lining reinforcing steel bar construction; the templates at two sides of the trolley are unfolded asymmetrically; lining concrete construction; repeating the steps until the construction of the small curve radius section is completed. The needle beam trolley is used for construction of the small curve radius section by the needle beam trolley lining construction method of the small section tunnel small curve radius section, the bracket die construction method adopted in the prior art is replaced, the advantages of the needle beam trolley are fully exerted, the lining integrity is good, no horizontal construction joint exists, the construction cost is low, the construction efficiency is high, and the construction period is short.
Description
Technical Field
The invention belongs to the technical field of construction methods, and particularly relates to a needle beam type trolley lining construction method for a small-section tunnel small-curve radius section.
Background
At present, in the construction process of hydraulic engineering in southwest areas of China, hydraulic tunnels generally have the characteristic of small section size and small curve section radius. The lining is used as an important component of the tunnel structure, the construction process directly relates to the whole engineering quality of the tunnel, and needle beam type trolley construction is adopted.
However, the whole length of the existing needle beam type trolley is longer, when facing a small curve radius section of a small-section tunnel, the needle beam is difficult to move forward and the center line is difficult to coincide with the center line of the tunnel due to length factors, the thickness of the inner side lining is not guaranteed due to light weight, and the problem that the whole fixture is not applicable is faced.
Therefore, in the prior art, a bracket molding method is required to be adopted, so that the construction cost progress and the construction quality control difficulty are greatly increased, and the flexible application of the needle beam type trolley to the lining construction of the small-section tunnel small-curve radius section is a technical difficulty to be overcome.
Disclosure of Invention
The invention aims to provide a needle beam type trolley lining construction method for a small-section tunnel small-curve radius section, which is used for solving the problems in the prior art.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
a needle beam type trolley lining construction method for a small-section tunnel small-curve radius section comprises the following steps:
constructing a straight section of the tunnel;
constructing a small curve radius section of the tunnel;
the construction of the tunnel small curve radius section comprises the following steps:
demolding and advancing the trolley;
positioning the needle beam of the trolley;
lining reinforcing steel bar construction;
the templates at two sides of the trolley are unfolded asymmetrically;
sealing the end mould;
lining concrete construction;
repeating the steps until the construction of the small curve radius section is completed.
In one possible design, the step of positioning the needle beam of the trolley comprises the steps of:
a first measurement lofting;
the position adjusting device adjusts the position;
positioning and retesting;
repeating the steps until the positioning retest is qualified.
In one possible design, the step of first measurement lofting includes the steps of:
taking the midpoint of the centerline of the next mould lining tunnel as a reference point, so that the centerline of the needle beam is tangent with the centerline of the tunnel at the position;
reversely pushing out the coordinate positions of the midpoints of the two ends of the needle beam;
and (5) setting out marks on construction sites.
In one possible design, the step positioning device positioning includes the steps of:
a positioning device is arranged below at least one of the two ends of the needle beam;
one end of the needle beam is fixed, and the other end of the needle beam is positioned by a positioning device;
and the two ends of the needle beam are crossed for multiple times to adjust positions until the needle beam moves to the lofting marking position.
In one possible design, the positioning device comprises a pallet, a roller, a lateral positioning member and a vertical support member;
the top surface of the supporting table is provided with a positioning groove and limiting blocks, the rolling shafts are provided with a plurality of limiting blocks which are arranged in the positioning groove in a rotating mode at equal intervals, and the limiting blocks are provided with two limiting blocks which are respectively fixed at two ends of the positioning groove; the bottom surface of the supporting platform is provided with a vertical supporting piece;
the transverse position adjusting piece comprises a transverse moving jack, an outer supporting leg and an inner supporting leg, the transverse moving jack is parallel to the supporting table, the transverse moving jack is provided with an outer end and an inner end which are opposite, the outer end is connected with the outer supporting leg, and the inner end is connected with the inner supporting leg; correspondingly, the outer supporting legs are vertically arranged and extend to the upper portion of the top surface of the supporting platform, and the inner supporting legs are connected with the supporting platform through the fixing pieces.
In one possible design, the fixing element is configured as an i-plate, which has two opposite connection surfaces, on which a transverse positioning element is arranged; the supporting platform comprises two opposite supporting beams, and a gap between the two supporting beams is configured as the positioning groove;
correspondingly, the rolling shaft is connected with the two joists; a group of vertical supporting pieces are connected to the bottom surface of each joist, and each vertical supporting piece comprises at least two jacking jacks arranged at intervals.
In one possible design, the step positioning retest includes the steps of:
the middle points of the two ends of the needle beam are provided with plumbs;
detecting whether the plumb coincides with the position of the lofting mark.
In one possible design, the asymmetric deployment of the two side templates of the step trolley comprises the steps of:
second measurement lofting;
expanding the template;
the trolley comprises two templates which face two side walls of the small curve radius section respectively, the templates are divided into a plurality of subareas, each subarea is connected with a support oil cylinder, and the support oil cylinders adjust the distance between the corresponding subarea and the side wall according to a second measurement lofting result so that the templates are attached to design lining contour lines.
In one possible design, the step template expansion includes the steps of: coating a release agent; adjusting the stroke of the corresponding support cylinder; the template is unfolded in a mode of alternately coordinating a small-amplitude multi-frequency multi-oil cylinder; retest inspection; repeating the steps until the template is attached to the designed lining contour line.
In one possible design, the step of end molding includes the steps of:
third measurement lofting;
sealing the mold;
the end mould line is obtained through third measurement lofting, and passes through the circle center along the radial direction of the small curve radius section (12) of the tunnel;
the step of die sealing comprises the following steps: selecting a first end sealing plate and a second end sealing plate; the first end sealing plate and the second end sealing plate are respectively fixed at two ends of the template;
the first end sealing plate is arranged between the template and the last die and is overlapped with the last die; the second end sealing plate is arranged on the inner side of the end part of the template and along an end mold line.
The beneficial effects are that:
the needle beam trolley is used for construction of the small curve radius section by the needle beam trolley lining construction method of the small section tunnel small curve radius section, the bracket die construction method adopted in the prior art is replaced, the advantages of the needle beam trolley are fully exerted, the lining integrity is good, no horizontal construction joint exists, the construction cost is low, the construction efficiency is high, and the construction period is short.
Drawings
FIG. 1 is a schematic flow chart of the construction of a small curve radius section of a tunnel.
Fig. 2-7 are schematic structural views of various processes of a needle beam type trolley lining construction method for a small-section tunnel with a small curve radius section.
Fig. 8 is a schematic structural view of a lateral positioning device.
Fig. 9 is a schematic side view of fig. 8.
Fig. 10 is a schematic structural view of a lateral positioning system when two lateral positioning devices are provided.
FIG. 11 is a schematic diagram of a lateral positioning system with a lateral positioning device.
FIG. 12 is a schematic illustration of profile survey point layout in a second survey setting-out.
In the figure:
1. a support; 101. joist; 2. a roller; 3. a transverse positioning member; 31. a traversing jack; 32. an outer support leg; 33. an inner support leg; 4. a vertical support; 401. a jack is jacked; 5. a positioning groove; 6. a limiting block; 7. a fixing member; 8. needle beam; 9. a distribution beam; 10. a support; 11. a straight section; 12. a small curve radius segment; 13. a trolley; 14. and (5) a template.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be briefly described below with reference to the accompanying drawings and the description of the embodiments or the prior art, and it is obvious that the following description of the structure of the drawings is only some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort to a person skilled in the art. It should be noted that the description of these examples is for aiding in understanding the present invention, but is not intended to limit the present invention.
Example 1:
1-12, a needle beam type trolley lining construction method for a small-section tunnel small-curve radius section comprises the following steps:
constructing a tunnel straight section 11;
constructing a tunnel small curve radius section 12;
it is easy to understand that the tunnel can be divided into a straight section 11 and a small curve radius section 12, and under different construction conditions, at least one straight section 11 and at least one small curve radius section 12 are respectively arranged, and can be arbitrarily combined, namely, the construction of the straight section 11 of the step tunnel and the construction of the small curve radius section 12 of the step tunnel are not in a specific construction sequence.
Further, the construction of the straight section 11 of the step tunnel is performed by adopting the existing construction method of the needle beam 8 trolley 13, and the person skilled in the art knows how to construct the step tunnel, and the construction is not repeated here. For the construction of the small curve radius section 12 of the step tunnel, the needle beam 8 trolley 13 is used for the construction of the small curve radius section 12 by the needle beam trolley lining construction method of the small section tunnel small curve radius section, the bracket molding method adopted in the prior art is replaced, the advantages of the needle beam 8 trolley 13 are fully exerted, the lining integrity is good, no horizontal construction joint exists, the construction cost is low, the construction efficiency is high, and the construction period is short.
Specifically, the step of tunnel small curve radius section 12 construction includes the steps of:
s100: the trolley 13 is demolded and advanced.
I.e. the support cylinders on the trolley 13 are activated to bring the templates 14 of the trolley 13 to retract and disengage from the already completed lining structure. Based on this, the carriage 13 resumes the degree of freedom to facilitate advancing and adjusting the azimuth. Meanwhile, the trolley 13 advances and enters a next construction area, if the next construction area is a straight section 11, the trolley 13 construction method is carried out according to the existing needle beam 8; if the next construction area is the tunnel small curve radius section 12, the trolley 13 should be adjusted first.
S200: the needle beam 8 of the trolley 13 is positioned.
When the trolley 13 enters the small curve radius section 12, the trolley 13 is difficult to move forward, the forward moving distance is limited, the construction of the whole small curve radius section 12 is difficult to complete, the central line of the needle beam 8 of the trolley 13 gradually deviates from the central line of a tunnel, after the support cylinder is started to drive the template 14 to extend outwards, the distance between the templates 14 on two sides of the trolley 13 and the two side walls of the small curve radius section 12 is not uniform, and the lining thickness cannot be ensured. Therefore, the needle beam 8 of the trolley 13 is positioned to adjust the orientation of the trolley 13 through the step S200, so that the trolley 13 has the capabilities of transverse displacement and turning, and the linear characteristic of the small-radius curve segment can be well adapted.
S300: and (5) lining steel bar construction.
Based on this, a lining foundation structure is formed, and at the same time, when the form 14 of the trolley 13 is unfolded, lining reinforcing bars play a limiting role, and when the form 14 abuts against the reinforcing bars, it is explained that the form 14 moves to a limiting position.
S400: the templates 14 on both sides of the trolley 13 are unfolded asymmetrically.
Taking the construction of the straight section 11 as an example, in the conventional trolley 13 construction method of the needle beam 8, the distance between the templates 14 on the two sides of the trolley 13 and the two side walls of the straight section 11 is equal, and the templates 14 are unfolded with the same parameters. However, in the small curve radius section 12, the distance between the templates 14 on the two sides of the trolley 13 and the two side walls of the small curve radius section 12 is unequal, and the small curve radius section 12 is curved, the templates 14 need to be unfolded asymmetrically, so that the alignment precision of the templates 14 is high, the problem of lack of thickness of the lining on the inner side of the small curve radius section 12 of the small section tunnel can be effectively avoided, the thickness quality of the lining is effectively ensured, the lining structure is optimized according to the characteristics of the curve, the lining lengths on the two sides of the curve section are unequal, and the linear quality of the lining is effectively ensured.
S500: and (5) end mold sealing.
After the template 14 is unfolded, the side wall of the small curve radius section 12 and the template 14 are opposite to each other and form a lining area, and the lining area is provided with two opposite ends, wherein one end is connected with a mould, the other end is open, and the two ends of the lining area are closed through the end mould to form a closed lining area so as to facilitate the next construction.
S600: and (5) lining concrete construction.
Because the section of the tunnel is small, concrete transportation needs to be staged, the transportation outside the tunnel adopts a large amount of concrete tank trucks to transport to the tunnel opening, and the tunnel adopts a small amount of concrete tank trucks or material transporting trolleys with the structural size suitable for the section of the tunnel to transport to the pouring site. Sundries in the tunnel need to be cleaned before pouring, and transportation vehicles in the tunnel are reasonably arranged, so that the pouring process is ensured to be continuous and uninterrupted. Concrete is poured by a concrete pump, and according to the characteristics of a tunnel longitudinal slope, pouring is conducted in a layered and symmetrical mode from bottom to top through reserved pouring openings, wherein the layered thickness is 50cm, and the height difference of concrete surfaces at two sides is no more than 30cm. The concrete compactness is ensured by adopting a vibrating mode of combining an attached plate type vibrator and a vibrating mode of a reserved pouring opening extending into a tamping rod. And (5) curing the concrete, and removing the mould after the concrete is cured to the design strength of removing the mould.
S700: the above steps are repeated until the construction of the small curve radius segment 12 is completed.
The small curve radius section 12 is divided into a plurality of modes by the length of the template 14 of the trolley 13, and each mode is constructed by the construction method in the steps S100-S500. Based on the method, the moving and positioning construction flow of the trolley 13 is optimized to be one-die one-adjustment, the multiple frequency is small in amplitude, tunnel clearance of a to-be-poured lining section is fully utilized, the construction difficulty is low, and the construction is convenient.
In this embodiment, the step S200 of positioning the needle beam 8 of the trolley 13 includes the steps of:
s210: a first measurement lofting;
s220: the position adjusting device adjusts the position;
s230: positioning and retesting;
s240: repeating the steps until the positioning retest is qualified.
The first measurement lofting in step S210 includes the following steps:
s211: taking the midpoint of the centerline of the next mould lining tunnel as a reference point, so that the centerline of the needle beam 8 is tangent with the centerline of the tunnel at the position;
s212: reversely pushing out the coordinate positions of the midpoints of the two ends of the needle beam 8;
s213: and (5) setting out marks on construction sites.
As shown in FIG. 5, let the datum point be the B point, the midpoint of the two ends of the needle beam 8 be the A point and the C point respectively, calculate the position of the A point and the C point when the center line of the needle beam 8 is tangent to the center line of the tunnel at the position, and loft the mark to be marked as the positioning end point and the positioning retest datum.
The step S220 of positioning the positioning device comprises the following steps:
s221: a positioning device is arranged below at least one of the two ends of the needle beam 8;
s222: one end of the needle beam 8 is fixed, and the other end of the needle beam 8 is positioned by a positioning device;
s223: the two ends of the needle beam 8 are crossed and aligned for a plurality of times until the needle beam 8 moves to the lofting marking position.
As shown in fig. 5, the front end of the needle beam 8 can be adjusted to a relatively small position (point C position) according to the spatial relationship, and the end of the needle beam 8 can be adjusted (point a position) after the position is preferentially adjusted to the predetermined position. In the process, the needle beam 8 is adjusted to a preset position by adopting a mode that one end is fixed, the other end is adjusted, and the two ends are crossed gradually for multiple times due to limited space relation or overlarge adjustment stroke.
The step S230 of positioning retest includes the following steps:
s231: the middle points of the two ends of the needle beam 8 are provided with plumbs;
s232: detecting whether the plumb coincides with the position of the lofting mark.
Alternatively, the plumb may be placed in advance, and the width of the traverse of the carriage 13 may be adjusted based on the positional relationship between the plumb and the loft mark, so as to improve the adjustment efficiency.
In this embodiment, the step S400 of asymmetrically expanding the templates 14 on both sides of the trolley 13 includes the steps of:
s401: and (5) second measurement lofting.
In the second measurement lofting, according to the curve characteristics of the small-radius curve segment, the relative thickness of the middle point position on the inner side and the two ends of the outer side of the curve is relatively small when the template 14 is aligned, the thickness is easily reduced, the control is emphasized during the measurement lofting, and each of the two ends and the middle part of the lining is provided with one measurement section, as shown in fig. 12, each section is provided with 8 measuring points. Meanwhile, when the tunnel is excavated, the local moderate overexcavation of the small-radius curve section adjusts a reserved adjustment space for the lining template 14 so as to simultaneously ensure the requirements of tunnel clearance and lining thickness.
S402: the template 14 expands.
In the process of unfolding the template 14, the template 14 is coated with a release agent, and corresponding supporting cylinder strokes are adjusted in different areas according to the measurement result of the second measurement lofting, so that the template 14 is attached to the designed lining contour line, and the process is coordinated and adjusted alternately by a small amplitude and multiple frequency of multiple cylinders, so that the clamping or the deformation of the template 14 caused by overlarge stroke adjustment of individual cylinders is prevented.
After the expansion is finished, the gap (lining thickness) between the outer edge of the template 14 and the primary support and the thickness of the reinforcing steel bar protection layer at each part are subjected to repeated detection, the positions of the middle part and the outer end part of the inner side of the repeated detection curve are detected, and when the position of the middle part is detected, the casting hole is reserved to extend into the tape for detection, so that the dimension is found to be insufficient and timely adjusted.
Based on the method, the template 14 is enabled to have higher alignment precision through asymmetric unfolding, the problem of lack of thickness of the inner side lining of the small-section tunnel small-curve-radius section 12 can be effectively avoided, and the thickness quality of the lining is effectively ensured.
The measurement paying-off and the transverse unfolding adjustment of the template 14 are required to be synchronously carried out, and the measurement is carried out while the adjustment is carried out until the requirements of tunnel clearance and lining thickness are met.
The trolley 13 comprises two templates 14 facing to two side walls of the small curve radius section 12 respectively, the templates 14 are divided into a plurality of subareas, each subarea is connected with a support oil cylinder, and the support oil cylinders adjust the distance between the corresponding subarea and the side wall according to a second measurement lofting result so that the templates 14 are attached to design lining contour lines.
Based on this, the step template 14 expansion includes the steps of: coating a release agent; adjusting the stroke of the corresponding support cylinder; the template 14 is unfolded in a mode of alternately coordinating a plurality of small-amplitude multi-frequency multi-oil cylinders; retest inspection; the above steps are repeated until the form 14 conforms to the design lining contour.
In this embodiment, the step S500 end molding includes the following steps:
s501: and (3) third measurement lofting.
And acquiring an end die line through third measurement lofting, wherein the end die line passes through the center of the circle along the radial direction of the small curve radius section 12 of the tunnel. Further, any suitable existing measurement method may be used for the third measurement loft. For the lining area, one end of the lining area is connected with a mould, the other end of the lining area is open, and the position of the open end mould is limited by an end mould line so as to improve the lining quality.
S502: and (5) sealing the mold. Wherein, the step S502 of sealing the mold comprises the following steps: selecting a first end sealing plate and a second end sealing plate; the first and second end closure plates are secured to the ends of the form 14, respectively.
And the first end closure plate is disposed between the form 14 and the previous form and overlaps the previous form; the second end closure plate is disposed inboard of the end of the form 14 and along the end line.
Based on the method, the lining areas are optimized according to the curve characteristics of the small curve radius sections 12 of the tunnel, so that the lengths of the lining areas on two sides of the small curve radius sections 12 are unequal, and the lining linear quality is effectively ensured.
Example 2:
this embodiment describes, on the basis of embodiment 1, a positioning device for embodiment 1, wherein the positioning device includes a pallet 1, a roller 2, a lateral positioning member 3, and a vertical support member 4, as shown in fig. 8 to 11;
the top surface of the supporting table 1 is provided with a positioning groove 5 and limiting blocks 6, the rolling shafts 2 are provided with a plurality of limiting blocks which are arranged in the positioning groove 5 in a rotary mode at equal intervals, and the limiting blocks 6 are provided with two limiting blocks and are respectively fixed at two ends of the positioning groove 5; the bottom surface of the supporting platform 1 is provided with a vertical supporting piece 4;
the transverse position adjusting piece 3 comprises a transverse moving jack 31, an outer supporting leg 32 and an inner supporting leg 33, the transverse moving jack 31 is parallel to the supporting table 1, the transverse moving jack 31 is provided with an opposite outer end and an inner end, the outer end is connected with the outer supporting leg 32, and the inner end is connected with the inner supporting leg 33; accordingly, the outer leg 32 is disposed vertically and extends above the top surface of the pallet 1, and the inner leg 33 is connected to the pallet 1 by the fixing member 7.
When the needle beam 8 needs to be positioned, the positioning device is moved to the lower part of the needle beam 8, the supporting platform 1 is connected with the bottom surface of the needle beam 8, the transverse positioning piece 3 is utilized to provide driving force to push and pull the needle beam 8 to move along the positioning groove 5, the position of the needle beam 8 is adjusted, the difficulty of movement of the needle beam 8 in a tunnel is reduced, the center line of the needle beam 8 is coincided with the center line of the tunnel, and construction is facilitated.
Wherein, form bearing structure through saddle 1, needle beam 8 pegging graft to positioning groove 5 and butt in roller bearing 2, roller bearing 2 can the rotation, then effectively reduced the degree of difficulty that needle beam 8 removed. The transverse positioning piece 3 is connected with the needle beam 8 through a connecting end, so that driving force is provided to push and pull the needle beam 8, and the needle beam 8 slides along the positioning groove 5. The limiting block 6 is used for limiting the displacement range of the needle beam 8, so that the needle beam 8 cannot be separated from the supporting table 1.
Meanwhile, considering that the two ends of the needle beam 8 are respectively provided with the support 10, the support 10 is pressed on the tunnel, so that the vertical support 4 is arranged, the needle beam 8 is lifted up through the vertical support 4, so that the end part of the needle beam 8 is lifted up, the support 10 is separated from the tunnel, and the difficulty of pushing the needle beam 8 by the transverse position adjusting piece 3 is effectively reduced.
The traversing jack 31 may be any suitable commercially available jack that is laterally positioned to effect lateral movement. The outer leg 32 is used for connecting the needle beam 8, and preferably the outer leg 32 is detachably connected with the needle beam 8 for convenient assembly and disassembly. The inner leg 33 is used to attach the fixing member 7 to fix the lateral position adjusting member 3 to the pallet 1 and to provide a fulcrum for the application of force. It will be readily appreciated that the outer leg 32 and the inner leg 33 may be configured in any suitable shape, and that the outer leg 32 may be attached to the needle beam 8 by any suitable removable attachment.
When the needle beam positioning device works, the positioning device is positioned below the needle beam 8, the lower part of the needle beam 8 is inserted into the positioning groove 5 and is abutted to the roller 2, and the connecting end of the transverse positioning piece 3 is connected with the needle beam 8. The vertical support 4 is activated to lift the needle beam 8, the needle beam 8 is lifted up and the abutment 10 of the needle beam 8 is disengaged from the tunnel, and the vertical support 4 is locked after the abutment 10 is disengaged from the tunnel. The transverse position-adjusting piece 3 is started, power is provided by the transverse moving jack 31, and the needle beam 8 is pushed and pulled to slide along the position-adjusting groove 5 by the outer supporting leg 32 until the needle beam 8 moves to a required position.
As shown in fig. 8, the fixing element 7 is constructed as an i-plate with two opposite connection surfaces, on which a transverse positioning element 3 is arranged. Based on the design scheme, on one hand, the two needle beams 8 intermittently work and push and pull the needle beams 8 towards opposite directions respectively, so that the moving range of the needle beams 8 is increased, and the adjusting range is enlarged; on the other hand, the two needle beams 8 can push and pull the needle beams 8 in the same direction by working together, so that the weight range of the needle beams 8 can be increased, and the application range is widened.
In one possible implementation, the pallet 1 comprises two opposite joists 101, the gap between the two joists 101 being configured as said positioning slot 5, and the roller 2 connecting the two joists 101 accordingly. Based on the above design, the joists 101 are existing standard parts, and have multiple types and wide selection range, which is helpful for reducing the use cost, and simultaneously, the two joists 101 are mutually matched, which is also helpful for reducing the weight of the pallet 1.
In one possible implementation, a set of vertical supports 4 is connected to the bottom surface of each joist 101, the vertical supports 4 comprising at least two jack-up jacks 401 arranged at intervals. Based on the above design, a plurality of vertical supports 4 are provided to disperse the weight of the needle beam 8 to protect the positioning device. At the same time, the plurality of vertical supports 4 cooperate with each other, also increasing the jacking capacity. In addition, jack 401 may be of any suitable commercially available type.
Example 3:
in this embodiment, on the basis of embodiments 1 and 2, taking actual construction as an example, the small-section tunnel small-curve radius section needle beam type trolley lining construction method is compared with a bracket molding method adopted in the prior art, and benefit analysis is performed:
table 1 and Table 2 (hole diameter 2.4m, hole length 1800m, wherein the small radius curve section 300 m) are shown in detail by taking the Zunyi Leou Lian reservoir engineering yellow mud water delivery tunnel as an example.
1. Cost comparison
TABLE 1 yellow mud Water delivery tunnel small radius curve section different engineering quantities and component and part difference analysis table
And (3) construction cost calculation:
(1) Bracket molding method
Bracket rental fee: 1.51×8×88= 1063.04 yuan
Longitudinal girder material and processing cost: (0.34×4200+350×1) ×300/9/10= 5954.67 yuan
Annular girder material and processing cost: 0.85× (6283.15+822.83+289.58) = 6286.23 yuan
Template material cost: 65×50=3250 elements
Support template installation and disassembly cost: 400×6×300++9=80000
Template trolley transposition disassembly and assembly cost: 10000+3000+1500=14500 yuan;
(2) Needle beam trolley positioning method
Positioning device material, processing and installation cost: ((3000+400×4) +100×300×9) ×2= 7933.33 yuan;
to sum up, the cost is saved: (1063.04+5954.67+6286.23+3250+80000+14500-7933.33 = 103120.61 yuan.
2. Comparison of construction period
According to the on-site construction statistics, the bracket molding method can complete 1 construction cycle every 2.5 days, the needle beam trolley positioning method can complete 1 construction cycle every 1 day, and the construction period is compared as follows:
table 2 construction period difference analysis table
From the whole project, the two channels save 103120.61 yuan, the construction period is shortened by 55 days, the lining construction quality is good, and the social and economic benefits are obvious.
Finally, it should be noted that: the foregoing description is only of the preferred embodiments of the invention and is not intended to limit the scope of the invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The needle beam type trolley lining construction method for the small-section tunnel small-curve radius section is characterized by comprising the following steps of:
constructing a tunnel straight section (11);
constructing a tunnel small curve radius section (12);
the construction of the small curve radius section (12) of the tunnel comprises the following steps:
demolding and advancing the trolley (13);
positioning the needle beam (8) of the trolley (13);
lining reinforcing steel bar construction;
the templates (14) on two sides of the trolley (13) are unfolded asymmetrically;
sealing the end mould;
lining concrete construction;
repeating the steps until the construction of the small curve radius section (12) is completed.
2. The construction method according to claim 1, wherein the step of positioning the needle beam (8) of the trolley (13) comprises the steps of:
a first measurement lofting;
the position adjusting device adjusts the position;
positioning and retesting;
repeating the steps until the positioning retest is qualified.
3. The construction method according to claim 2, wherein the step of first survey lofting comprises the steps of:
taking the midpoint of the centerline of the next mould lining tunnel as a reference point, so that the centerline of the needle beam (8) is tangent with the centerline of the tunnel at the position;
reversely pushing out the coordinate positions of the midpoints of the two ends of the needle beam (8);
and (5) setting out marks on construction sites.
4. The construction method according to claim 2, wherein the step of positioning the positioning device comprises the steps of:
a positioning device is arranged below at least one of the two ends of the needle beam (8);
one end of the needle beam (8) is fixed, and the other end of the needle beam (8) is positioned by a positioning device;
the two ends of the needle beam (8) are crossed and adjusted for a plurality of times until the needle beam (8) moves to the lofting marking position.
5. The construction method according to claim 2 or 4, characterized in that the positioning device comprises a pallet (1), a roller (2), a transverse positioning member (3) and a vertical support member (4);
the top surface of the supporting table (1) is provided with a positioning groove (5) and limiting blocks (6), the rolling shafts (2) are provided with a plurality of limiting blocks which are arranged in the positioning groove (5) in a rotating mode at equal intervals, and the limiting blocks (6) are provided with two limiting blocks and are respectively fixed at two ends of the positioning groove (5); the bottom surface of the supporting platform (1) is provided with a vertical supporting piece (4);
the transverse position adjusting piece (3) comprises a transverse moving jack (31), an outer supporting leg (32) and an inner supporting leg (33), the transverse moving jack (31) is parallel to the supporting table (1), the transverse moving jack (31) is provided with an outer end and an inner end which are opposite, the outer end is connected with the outer supporting leg (32), and the inner end is connected with the inner supporting leg (33); correspondingly, the outer supporting legs (32) are vertically arranged and extend to the upper portion of the top surface of the supporting platform (1), and the inner supporting legs (33) are connected with the supporting platform (1) through fixing pieces (7).
6. The construction method according to claim 5, characterized in that the fixing element (7) is constructed as an i-plate with two opposite connection surfaces, on which two connection surfaces a transverse positioning element (3) is arranged, respectively; the supporting table (1) comprises two opposite supporting beams (101), and a gap between the two supporting beams (101) is configured as the positioning groove (5);
correspondingly, the roller (2) is connected with two joists (101), a group of vertical supports (4) are connected to the bottom surface of each joist (101), and each vertical support (4) comprises at least two jacking jacks (401) arranged at intervals.
7. The construction method according to claim 2, wherein the step of positioning retesting comprises the steps of:
the middle points of the two ends of the needle beam (8) are provided with plumbs;
detecting whether the plumb coincides with the position of the lofting mark.
8. The construction method according to claim 1, wherein the step of asymmetrically expanding the templates (14) on both sides of the trolley (13) comprises the steps of:
second measurement lofting;
the template (14) is unfolded;
the trolley (13) comprises two templates (14) which face two side walls of the small curve radius section (12) respectively, the templates (14) are divided into a plurality of subareas, each subarea is connected with a support oil cylinder, and the support oil cylinders adjust the distance between the corresponding subarea and the side wall according to a second measurement lofting result so that the templates (14) are attached to design lining contour lines.
9. The construction method according to claim 8, wherein the step of expanding the template (14) comprises the steps of: coating a release agent; adjusting the stroke of the corresponding support cylinder; a template (14) is unfolded in a mode of alternately coordinating a plurality of small-amplitude multifrequency cylinders; retest inspection; repeating the steps until the template (14) is attached to the designed lining contour line.
10. The construction method according to claim 1, wherein the step of end-molding the mold comprises the steps of:
third measurement lofting;
sealing the mold;
the end mould line is obtained through third measurement lofting, and passes through the circle center along the radial direction of the small curve radius sections (12) (12) of the tunnel;
the step of die sealing comprises the following steps: selecting a first end sealing plate and a second end sealing plate; the first end sealing plate and the second end sealing plate are respectively fixed at two ends of the template (14);
the first end sealing plate is arranged between the template (14) and the upper die and is overlapped with the upper die; the second end seal plate is disposed inboard of the end of the die plate (14) and along the end die line.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117572878A (en) * | 2024-01-17 | 2024-02-20 | 四川省铁路建设有限公司 | Full-automatic frame bridge construction integrated intelligent trolley control method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117572878A (en) * | 2024-01-17 | 2024-02-20 | 四川省铁路建设有限公司 | Full-automatic frame bridge construction integrated intelligent trolley control method and system |
| CN117572878B (en) * | 2024-01-17 | 2024-03-19 | 四川省铁路建设有限公司 | Full-automatic frame bridge construction integrated intelligent trolley control method and system |
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