CN111636372B - Construction method for laying interlocking block soft mattress in high-beach shallow water area under low water level - Google Patents

Construction method for laying interlocking block soft mattress in high-beach shallow water area under low water level Download PDF

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Publication number
CN111636372B
CN111636372B CN202010640958.2A CN202010640958A CN111636372B CN 111636372 B CN111636372 B CN 111636372B CN 202010640958 A CN202010640958 A CN 202010640958A CN 111636372 B CN111636372 B CN 111636372B
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row
traction
soft
construction
laying
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CN111636372A (en
Inventor
陈一梅
李晶晶
金剑
马文泰
余松林
李祥炜
钱明
李志朋
王潇
夏伦亮
陈小坤
胡啸宇
张大伟
江小寒
孙嘉
李伟亮
袁晓瑞
李晓瑜
张敬卫
田道森
郝建新
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NANJING CHANGJIANG WATERWAY ENGINEERING BUREAU
Southeast University
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NANJING CHANGJIANG WATERWAY ENGINEERING BUREAU
Southeast University
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    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B3/00Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/12Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
    • EFIXED CONSTRUCTIONS
    • E02HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02BHYDRAULIC ENGINEERING
    • E02B3/00Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
    • E02B3/04Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
    • E02B3/12Revetment of banks, dams, watercourses, or the like, e.g. the sea-floor
    • E02B3/14Preformed blocks or slabs for forming essentially continuous surfaces; Arrangements thereof

Abstract

The invention provides a construction method for paving interlocking block soft rows in a high-beach shallow water area under a low water level, which is characterized in that concrete interlocking blocks are bound on a paving ship to manufacture the soft rows, traction equipment is arranged on a bank slope, a traction cable is connected with the traction equipment and a traction steel beam, the traction steel beam and the soft rows bound with the concrete interlocking blocks are bound by using a polypropylene fiber rope, and the soft rows on the paving ship are further drawn to the designed position of the high-beach shallow water area by the traction equipment, so that the one-time paving construction operation of the soft rows in the high-beach shallow water area under the low water level is realized. Compared with the prior art, the invention overcomes the problems that the mattress pad and the concrete interlocking block in the high-beach and shallow water area under the low water level can not be laid integrally for construction because of separate operation, and has the advantages of safe construction, good quality, high efficiency and the like.

Description

Construction method for laying interlocking block soft mattress in high-beach shallow water area under low water level
Technical Field
The invention belongs to the technical field of river bank protection construction, and particularly relates to a construction method for laying a concrete interlocking block soft body row in a high-beach shallow water area under a low water level.
Background
The high beach is a river flood beach with a higher beach surface elevation, and is submerged by water in flood seasons, and the exposed part area is larger in dry seasons. When the water level is low in dry seasons, a shallow water area with a gentle slope and a large area exists between a laying ship and a bank slope in the process of laying concrete interlocking block soft row bank protection on a high beach. Due to the fact that the draught of the laying ship is not enough, construction near the bank cannot be achieved. The existing high beach laying construction mode mainly comprises the following steps: 1. construction mode under the low water level: dragging the row cushion to a designed row head position on a bank slope by dozens of workers, and binding a concrete interlocking block on the row cushion by the workers on the bank; and if the water depth of the shallow water area is less than that of the area where the laying ship eats water, the concrete interlocking blocks cannot be bound on the laying mat manually, and only the concrete interlocking blocks can be thrown. Therefore, the concrete interlocking block soft body row is manually paved in a shallow water area, so that the construction operation is dangerous, and the construction quality is difficult to guarantee. 2. Construction mode under the high water level: after the water level rises to meet the draught requirement of the laying ship, the laying ship can carry out near-shore construction; because the high water level period is a period when fishes spawn and grow frequently, the laying construction is easy to cause damage to fish resources, for example, the laying construction is definitely forbidden in the high water level period for the purpose of ecological protection in the water depth channel improvement engineering from Wuhan to Anqing section 6m in the Yangtze river trunk; on the other hand, waiting for the water level to rise also affects the construction period and the construction of subsequent projects.
Particularly, the high beach laying construction is carried out under low water level, and the problem that the integral one-time laying operation cannot be carried out in a shallow water area between a laying ship and a designed laying position and the laying quality and efficiency are difficult to guarantee is not solved.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a construction method for realizing that soft raft in a high-beach and shallow-water area can be laid in place at one time by arranging traction equipment on a beach platform under the condition that a low-water-level lower berth ship cannot carry out soft raft laying operation in the high-beach and shallow-water area, and the construction quality and efficiency are improved.
The technical scheme is as follows: a construction method for laying a concrete interlocking block soft row in a high-beach shallow water area under a low water level includes binding the concrete interlocking block on a row cushion on a row-laying ship to manufacture the soft row, arranging traction equipment on a bank slope, connecting the traction equipment with a traction steel beam through a cable, binding the traction steel beam on a row-head reinforcing ring of the soft row through a polypropylene rope, and further drawing the soft row from the row-laying ship to a designed position through the traction equipment to finish the laying of the soft row in the high-beach shallow water area. The concrete construction steps are as follows:
1. design of construction scheme
Collecting basic parameters required by the design of a construction scheme, and calculating key numerical values such as the number of traction equipment, the length and the strength of a traction steel beam, the strength of a mat arrangement and the like required to be used in construction;
2. preparation for construction
Preparing materials and equipment: designing customized row cushions and traction steel beams according to a construction scheme, and preparing concrete interlocking blocks, traction equipment, traction cables, polypropylene ropes and the like;
secondly, bank slope arrangement: before construction, removing impurities and hard objects (particularly shallow water areas) on the surface of the bank slope, carrying out necessary slope repairing construction, cutting off steep ridges, filling pits and ensuring that soft banks of the bank slope are laid smoothly;
safety inspection of construction equipment: checking whether various performances of the construction equipment are in a normal safe state;
3. positioning of laying ship
And positioning the laying ship according to the laying position of the software row in the engineering design book and the actual measurement data of the GPS. The positioning method is to adjust the anchor position of the spread ship to ensure that the center line of the deck of the spread ship is superposed with the center line of the area where the soft body is to be spread; on the premise of meeting the draught requirement of the laying ship, the laying ship is positioned as close to a bank slope as possible; the longitudinal direction of the soft mattress is vertical to the direction of a river bank, and the transverse direction of the soft mattress is along the direction of the river bank.
4. Traction equipment positioning
The method comprises the following steps of positioning traction equipment according to the position of a berthing ship, wherein each traction equipment needs to be positioned in a flat and wider land area on a bank slope, specifically, when a plurality of traction equipment are used, the transverse area of a soft berthing body is equally divided according to the number of the traction equipment, each traction equipment is placed in the middle of each equal part, and the distance between every two adjacent equipment is equal to the sum of the length of a single traction steel beam and the installation distance between every two adjacent traction steel beams.
5. Traction steel beam binding
And (3) wrapping the row mat on a roller of the row ship, and braking the roller when the row head approaches the boundary line between the deck of the row ship and the turning plate to finish row rolling. And penetrating the prepared traction steel beam into the set row head reinforced ring, and fixing the traction steel beam and the reinforced ring together by using a polypropylene rope. The traction cable is used for connecting the traction steel beam with the traction equipment, eight strands of polypropylene ropes are preferably adopted as the traction cable, the diameter of each cable is not less than 20mm, and the tying point of the traction cable on the traction equipment is stable and firm.
6. Marking line
And starting a traction device to pull the row cushion, stopping traction when the length of the pulled row cushion is estimated to be slightly larger than the bank slope length S between the designed row head position and the water bank line, measuring the length S from the row head, and marking the position to form a marking line.
7. Concrete interlocking block and moso bamboo pipe binding
Firstly, binding of concrete interlocking blocks: when the mark line on the row mat is close to the turning plate, the traction equipment brakes and the roller of the laying ship brakes, and the row mat is fixed by putting down the clamping beam on the laying ship; and binding the concrete interlocking blocks to the row cushions from the marking lines.
Secondly, binding the moso bamboo pipes: the moso bamboo tubes are bound in the transverse lapping range of the soft mattress and used for reducing the friction at the lapping position of the adjacent soft mattress. After the concrete interlocking blocks are bound, cutting off a polypropylene rope longitudinally connected with the concrete interlocking block units within the overlapping width range, placing bamboo pipes into the concrete interlocking block units at longitudinal intervals, wherein the diameter of each bamboo pipe is preferably equal to or slightly larger than the thickness of each concrete interlocking block, and the bamboo pipes, the row pads and the concrete blocks are bound and fixed together through the polypropylene rope.
8. Traction of soft mattress
When the longitudinal length of the soft row bound with the concrete interlocking block is close to the length of the deck, loosening the clamping row beam and the roller, starting traction equipment to pull the soft row and discharging the row cushion; when the discharged row cushion is close to the turning plate, stopping traction, braking by the roller, and continuously binding the concrete interlocking blocks and the moso bamboo tubes; and (4) dragging the soft raft again after binding, and repeating the steps until the concrete interlocking block at the front end of the soft raft is close to the water shoreline, braking by a traction device, braking by a roller, and dropping the fixed mattress of the clamping row beam.
9. Fixing the row head
Arranging a row head pile fixed row head at the row head of the bank slope, specifically, driving the row head pile at a position 5m away from the row head on the bank slope, wherein the driving depth is not less than 1m, and the soil surface is exposed by 0.5 m; the reinforced rings at the row head are untied one by one and the polypropylene ropes bound with the traction steel beams are immediately connected with the row head piles by the polypropylene ropes when one reinforced ring is untied; and recovering the steel beam after untying all binding wires on the traction steel beam.
10. Construction of on-shore laying and deep water area laying
After the row heads are fixed, the row cushions on the bank are bound by constructors according to the design to complete the laying work, and the soft row in the deep water area is laid by using a laying ship to sink and construct.
Specifically, the invention relates to a concrete interlocking block soft body row which comprises a row cushion positioned at the lower layer and concrete interlocking blocks bound on the row cushion according to a uniform array, wherein the row cushion is made of woven cloth and reinforced bars through sewing.
Specifically, the invention aims at the soft raft laying construction of a high-beach shallow water area under a low water level, the shallow water area has a gentle slope, the water depth is less than the draft of a laying ship, and the length of the shallow water area is generally between 15 and 30 m.
The construction scheme is designed according to the following steps:
1. collecting basic parameters required by the design of a construction scheme, wherein the basic parameters comprise a construction site water level (m), a laying ship type depth H (m), an operation draft depth T (m), a flap plate length L (m), a row cushion width B (m), a flap plate downward turning angle beta (rad), and the weight m of a single concrete interlocking blockC(kg), block center spacing d (m) after concrete interlocking block binding, and weight m of row cushion per unit areaP(kg/m2) Longitudinal tensile strength F of woven clothP(N/m) tensile Strength of RibJ(N), the number C of the ribs sewed in the transverse direction of the mattress pad, and the friction coefficient mu between the soft mattress and the deck surface1The coefficient of friction mu between the soft raft and the bank slope2Bank slope angle theta (rad), rated traction force F of traction equipmentW(N), the distance S (m) between the designed row head position and the water bank line, the lapping width b (m) of the adjacent soft body row, and the friction coefficient mu of the lapping part of the soft body row3
2. Determining the maximum traction force required by traction, and calculating according to the following formula:
FQ=FC+FA+FD… … … (formula 1)
In the formula, FQ-the traction force required in traction, in units of N;
FCthe friction force generated by the contact part of the soft raft and the spread ship is N;
FAthe friction force generated by the contact part of the soft mattress and the bank slope has the unit of N;
FDthe friction force generated by the overlapping part of the soft mattress has the unit of N;
g is gravity acceleration with the unit of N/kg;
3. determining the number of required traction devices, and calculating according to the following formula:
wherein i is the number of traction devices;
K1the safety factor when the soft mattress is pulled is preferably more than 2;
FW-the nominal traction of the traction device in N;
4. the strength of the mattress is tested, the strength of the mattress is composed of woven cloth and the strength of the reinforcing ribs, and the mattress is calculated according to the following formula:
K2FQ≤BFP+CFJ… … … (formula 6)
In the above formula, K2The stress safety factor of the row cushion is not less than 3.
5. Determining the length and specification of a traction steel beam, wherein the traction steel beam is made of a steel pipe, and the outer diameter of the steel pipe is slightly smaller than the diameter of the rib ring of the row head, so that the steel pipe can conveniently penetrate through the rib ring of the row head; the wall thickness of the steel pipe is not less than 10 mm; the number of the traction steel beams is the same as that of the traction equipment; mounting intervals are reserved between the traction steel beams and the transverse edges of the mattress pads; the length of a single traction beam can be calculated by the following formula:
in the formula, LG-the length of the traction steel beam in m;
Lpthe unit of the distance between the adjacent traction steel beams is m, and preferably 1-3 m;
Lrthe distance between the transverse edge of the row mat and the traction steel beam is m, preferably 1-2 m.
6. The steel pipe inspection is carried out, the number and the spacing of tie points of the traction cable on the traction steel beam are selected, the number of the tie points is preferably 3-5, and the spacing between the tie points is set so that the shearing force and the bending moment borne by the traction steel beam are dispersed as much as possible; according to the requirements on the bent member in the current GB 50017 steel structure design specification and the traction force calculated by the formula (1), whether the selected steel pipe meets the design requirements on strength, integral stability and slenderness ratio is checked.
Specifically, the traction equipment adopted in the invention is suitable for selecting an excavator on a construction site, the excavator is common on the construction site, the operation is flexible, the walking is convenient, the traction force is large, the stability is good, the dispatching is convenient, and the function of repairing the slope is realized. Furthermore, the number of the excavators is preferably 3, when the number of the excavators is too small, the requirement on the strength of the traction steel beam is high, and the difficulty in controlling the transverse contraction of the mat arrangement in the traction process is increased; when the number of excavators is too large, the synchronism among a plurality of devices is difficult to control.
Further, the method for binding the traction steel beam and the row head reinforcing ring comprises the steps of penetrating the traction steel beam into the row head reinforcing ring, fixing the reinforcing bars and the traction steel beam by using the polypropylene rope, winding rope heads at two ends of the polypropylene rope on the reinforcing ring during binding, then respectively bypassing the traction steel beams at two sides of the reinforcing ring, and tying and tensioning the rope heads of the polypropylene rope right above the reinforcing ring. The polypropylene fiber rope is used in a large amount in the laying construction, and is convenient to take and use.
Specifically speaking, when being connected through the traction cable between traction equipment and the traction steel beam, fix the one end of pulling the hawser on traction equipment earlier, pull the hawser and draw the tie point department on the steel beam, wind 5 rings (make the stress point dispersion on the traction steel beam) on pulling the steel beam, pull back the fag end of pulling the hawser and tie a knot on traction equipment and tie fixedly again, notice during the ligature that the pulling hawser should be taut, guarantee that many hawsers receive force jointly when pulling.
Specifically, the marking line firstly measures the bank slope length S between the designed row head position and the water bank line, then measures the length S from the row head line of the row mat, and makes an obvious mark on the row mat, for example, a colored ribbon can be bound on a reinforced ring at the position; the straight line formed by the marks is the mark line on the mattress, and after the traction is finished, the position of the mark line is superposed with the water bank line on the site. The water shoreline is the boundary line between the water surface and the bank slope when the water level is constructed on the same day.
Further, during traction operation, the traction equipment should keep a low-speed gear to perform constant-speed traction, and the speed should not be more than 0.2 m/s; as optimization, when a plurality of devices are used for jointly towing, the towing speeds of the plurality of towing devices are kept synchronous, and a specially-assigned person is arranged at a construction site to command a driver of the towing device and adjust the towing speed in time to ensure the towing synchronization.
As optimization, when the mattress is manufactured, oblique reinforcing ribs are sewed on the left side and the right side of each reinforcing ring at intervals from the mattress head along the direction of an angle of 45 degrees so as to enhance the tensile strength of the mattress; the oblique reinforced bars are sewn in the range of 5m from the row head in the longitudinal direction, and the oblique reinforced bars and the vertical reinforced bars are prevented from crossing and overlapping.
Advantageous effects
Compared with the prior art, the method has the following advantages:
1. the method solves the problems of low construction efficiency, high safety risk and poor engineering quality caused by manually dragging the mattress pad and throwing the concrete interlocking block in the shallow water area during high beach laying under low water level in the prior art, realizes one-step laying of the soft mattress in the shallow water area, effectively ensures construction quality and progress, avoids manual water laying operation, and ensures the safety of constructors.
2. The invention adopts the traction equipment to pull the soft mattress, replaces the prior construction method which needs a large amount of manual traction mattress pads, realizes mechanized construction and improves the construction efficiency of high beach laying.
3. The traction steel beam bound at the row head plays a role of transversely opening the row cushion, and avoids the transverse contraction of the row cushion in the traction process; the obliquely-reinforced ribs are sewn in a certain range of the row head, so that the tensile strength of the row cushion is enhanced; the proposed transverse binding of the moso bamboo tubes in the overlapping range of the adjacent soft mattress can reduce the friction at the overlapping position when the soft mattress is pulled.
4. The method improves the flexibility of construction time selection, and the construction in dry seasons is favorable for protecting fishery resources in the channel and promoting ecological restoration.
Drawings
The invention is further described below with reference to the accompanying drawings:
fig. 1 is a schematic longitudinal sectional view of the arrangement of on-site construction equipment, construction materials, and the like before the start of pulling.
Fig. 2 is a three-dimensional schematic view of the layout of the site construction equipment, construction materials, etc. before the start of pulling.
Figure 3 is a perspective view of the site with the marked lines approaching the flaps.
Fig. 4 is a three-dimensional schematic of the site at the completion of towing.
In fig. 1 to 4, the materials represented by the respective numbers are as follows: 1-a traction device; 2-laying a ship; 3-a roller; 4-clamping the row beams; 5-deck; 6-turning over the board; the turning plate is turned downwards by an angle beta of 7 degrees; 8-pulling the cable; 9-a traction steel beam; 10-polypropylene fiber ropes for binding; 11-weaving cloth; 12-arranging head reinforcing rings; 13-longitudinal ribbing; 14-oblique reinforcing ribs; 15-mark line; 16-concrete interlocking blocks; 17-individual concrete blocks; 18-designing a row head position line; 19-water shoreline; 20-length S, i.e. the distance between the design head position line and the water bank line; a 21-angle theta, a bank slope angle from below the water bank line to the position of the spread and raft ship; 22-row of head piles; 23-moso bamboo tube.
The specific implementation mode is as follows:
the invention is further described in detail below with reference to the accompanying drawings and practical test cases of the method of the invention.
The construction example is east-flow water channel bank protection engineering in the 6-meter water depth channel improvement engineering of the Wuhan to Anqing section of the Yangtze main line. During the specific construction, the steps are as follows:
1. design of construction scheme
Firstly, collecting basic parameters required by the design of a construction scheme, as shown in fig. 1 and 2, the basic parameters of the example are as follows:
TABLE 1 example basic parameter Table
Determining the number of traction equipment: calculating the number of excavators required to be used in construction, and calculating the required traction force to be 237kN according to the formula (1); the required number of the excavators is 3 according to the formula (2), and the safety factor is 2.3.
Designing a mattress: the row cushion is sewed with oblique reinforcing ribs 14 forming an angle of 45 degrees with the longitudinal direction of the row cushion every other row head reinforcing ring 12 within the range of 5m from the row head in the longitudinal direction, and the oblique reinforcing ribs and the vertical reinforcing ribs cannot be crossed or overlapped; checking and calculating the strength of the mattress according to the formula (3), wherein the stress safety coefficient of the mattress is 12.5, and the tensile strength meets the requirement;
selecting traction steel beams 9, selecting 3 steel pipes with the same specification according to the calculated number of the excavators, and taking the distance between the traction steel beams 9 as 1m according to the formula (4), wherein the distance between the traction steel beams 9 and the transverse edge of the row mat 8 is 1m, and the length of each steel pipe is 12 m; the diameter of the mattress pad and mattress head reinforcing ring 12 is 80mm, the outer diameter of the selected steel pipe is 76mm, and the wall thickness is 10 mm; according to the requirements and calculated traction force of GB 50017 Steel Structure design Specification on the bent member, the number of the system points of the traction cable 8 on each traction steel beam 9 is designed to be 3, the distance between adjacent system points is 4m, the strength, the integral stability and the slenderness ratio of the selected steel pipe are calculated through checking, and the selected steel pipe meets the design requirements through the checking result.
2. Preparation for construction
Preparing materials and equipment: as shown in fig. 2, a customized traction steel beam 9 and row pads are arranged; preparing a concrete interlocking block, and 3 traction devices, namely a 1 Volvo EC210B type excavator; the hauling cable 8 is made of eight strands of polypropylene ropes, and the diameter of each rope is 30 mm; the moso bamboo tubes 23 are 3m in length and 0.1m in diameter; the polypropylene rope 10 for binding is selected from three strands of polypropylene ropes with the diameter of 12 mm.
TABLE 2 materials, Equipment table
Secondly, bank slope arrangement: before construction, removing impurities and hard objects on the surface of a bank slope, particularly removing stones, plant roots and the like in a shallow water area; carrying out necessary slope repairing;
safety inspection of construction equipment: checking whether the various performances of the laying ship 2 and the excavator are in normal safety states;
3. lay-out vessel 2 positioning
As shown in FIG. 2, the positioning of the berthing ship is carried out according to the berthing position of the software berth in the engineering design book and the actual measurement data of the GPS. Adjusting the anchor position of the spread ship to ensure that the center line of the deck 5 of the spread ship is superposed with the center line of the area where the soft body is to be spread; on the premise of meeting the draught requirement of the laying ship 2, the laying ship is positioned as close to a bank slope as possible.
4. Excavator positioning
As shown in fig. 3, the excavators are positioned according to the position of the spread ship 2, and each excavator is positioned at a flat, open land area on a bank slope. When the 3 excavators are positioned, the positioning position of the excavator positioned in the middle is determined, the positioning position is opposite to the center line of the deck 5 of the spread ship 2, and the positioning distance between the excavators on two sides is equal to 13 m.
5. Traction steel beam 9 binding
As shown in fig. 3, the mattress is wrapped around the rollers 3 of the laying vessel 2, noting that the rollers 3 brake when the row head is at the interface of the deck 5 of the laying vessel and the flap 6, completing the row. The prepared traction steel beam 9 is penetrated into the reinforced ring 12 of the mat row head, and the polypropylene rope 10 is used for fixing the traction steel beam 9 and the reinforced ring 12 together. A traction cable 8 is connected between the traction steel beam 9 and the traction equipment 1, the number of the traction cable rope tying points on each traction steel beam is 3, and the distance between every two adjacent tying points is 4 m; when the excavator is connected with the traction steel beam 9 through the traction cable 8, one end of the traction cable 8 is fixed on the excavator, the traction cable 8 is pulled to a tying point on the traction steel beam 9, 5 circles are wound on the traction steel beam 9, the rope head of the traction cable 8 is pulled back to the excavator to be knotted and bound, and the traction cable 8 is tensioned during binding.
6. Mark line 15 mark
As shown in fig. 3, according to the field measurement that the bank slope length S20 between the row head design position line 18 and the water bank line 19 is 15m, the traction device 1 is started, the excavator pulls the row pad, the length of 15m measured in the longitudinal direction of the row pad is measured from the row head of the row pad, and the color ribbon is tied on the reinforced ring at the position, namely the mark line 15.
7. Concrete interlocking block 16 and bamboo tube 23 binding
Firstly, binding a concrete interlocking block 16: as shown in fig. 3, when the marking line 15 approaches the turning plate 6, the traction device 1 brakes, the roller 3 brakes, and the row clamping beam 4 on the laying ship 2 is put down to fix the row cushion; the concrete interlocking block units 16 are bound to the row mats starting from the marking lines 15. The concrete interlocking block units 16 are first hoisted from the barge to the deck 5 of the spread 2 by using a hoist on the spread 2, and then the rings of the concrete interlocking block units 16 and the reinforced rings on the mat are bound together by the construction personnel through the polypropylene ropes 10.
Binding the moso bamboo tubes 23: in the engineering design, the soft raft is required to be transversely lapped for 3m, so the moso bamboo tubes are bound in the lapping range of the soft raft and the next soft raft to reduce friction; during specific construction, a polypropylene rope longitudinally connected with the concrete interlocking block units within the overlapping width range is cut, a moso bamboo pipe with the length of 3m is placed in the longitudinal space of the concrete interlocking block units, the diameter of the moso bamboo pipe is 0.1m, and the moso bamboo pipe, the mattress pads and the concrete blocks are bound and fixed together through the polypropylene rope.
8. Traction of soft mattress
After the concrete interlocking block unit 16 with the length of 10m and the moso bamboo pipe are bound on the deck, as shown in fig. 3, the clamp row beam 4 is loosened, the traction equipment 1 excavator is started to pull the soft row, the traction speed is controlled within 0.2m/s, and a field commander carries out communication command with 3 operators of the traction equipment 1 excavator through an interphone, so that the synchronization of the traction speed is guaranteed; when the length of a row pad which is not bound with a concrete block on a deck exceeds 5m, a traction device brakes, a roller brakes and falls down to clamp a row beam, and the remaining concrete interlocking block units and the capillary bamboo tubes which are 5m long are bound on the deck; after binding is finished, lifting the clamping row beam, starting a traction device, and continuously pulling the soft row; when the front end of the concrete interlocking block unit 16 approaches the water shoreline 19, the traction equipment 1 is braked by the excavator and falls down the row fixing pad of the clamp row beam 4.
9. Fixing the row head
As shown in FIG. 4, a row head is fixed by installing a row head pile 22 at a row head position line 18 on a bank slope, and the row head pile 22 is driven at a distance of 5m from the row head on the bank slope, with a driving depth of 1m and a soil surface exposed by 0.5m above. At the head of the row, the reinforced rings 12 and the polypropylene ropes 10 bound with the traction steel beam 9 are untied one by one, and the reinforced rings 12 are connected with the head-row piles 22 by the polypropylene ropes 10 at once every time when one reinforced ring is untied, so that the reinforced rings 12 are not allowed to be untied at the same time. And recovering the traction steel beam 9 after all the bound polypropylene ropes 10 on the traction steel beam 9 are untied.
10. Construction of on-shore laying and deep water area laying
As shown in fig. 4, after the row heads are fixed, the row cushions on the bank are bound by constructors according to the design to bind the concrete interlocking blocks to complete the laying work, and the soft row in the deep water area is laid by using a laying ship and adopting a sinking construction method.
Compared with the prior construction method, the construction method for arranging the concrete interlocking block soft mattress in the high beach solves the problem that the mattress in the shallow water area and the concrete interlocking block unit 16 cannot be integrally constructed when the high beach is arranged at a low water level, improves the arrangement quality and the construction efficiency of the concrete interlocking block soft mattress, and protects the personnel safety in the construction process.
The above description is only exemplary of the present invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A construction method for paving interlocking block soft rows in a high-beach shallow water area under a low water level comprises the steps of binding concrete interlocking blocks on a row cushion on a row ship to form a soft row, and arranging traction equipment on a bank slope; the traction equipment is connected to the row head reinforcing ring through a traction cable, a traction steel beam and a polypropylene rope, and the soft raft is pulled to a designed position from the laying ship to finish the laying of the soft raft in the high-beach shallow water area; including the construction steps that the berth-berth ship location, traction equipment location, ligature pull girder steel, mark line, ligature concrete interlocking piece and mao bamboo pipe, software row pull and row head are fixed, its characterized in that:
the binding traction steel beam is used for wrapping the row mat on a roller of the row ship, and the roller is braked when the row head approaches the boundary line between the deck of the row ship and the turning plate, so that row rolling is completed; penetrating the prepared traction steel beam into the set row head reinforced ring, fixing the traction steel beam and the reinforced ring together by using a polypropylene rope, and connecting the traction steel beam with traction equipment by using a traction cable;
the moso bamboo tubes are bound in the transverse lapping range of the soft mattress and used for reducing the friction at the lapping position of the adjacent soft mattress;
the marking line measures the length of a bank slope between a designed row head position and a water bank line, measures the length from the row head line of the row mat and binds the position of a colored ribbon on the row mat as the marking line, and after traction is finished, the position of the marking line is superposed with the water bank line on site; the water shoreline is a boundary line between the water surface and a bank slope during construction on the same day;
the scheme design is carried out before construction, and the method comprises the following steps:
step 1, collecting basic parameters required by the design of a construction scheme, including the water level of a construction site, the depth H of a laying ship, the operation draft T, the length L of a turning plate, the width B of a laying pad, the downward turning angle beta of the turning plate, and the weight m of a single concrete interlocking blockCThe distance d between the centers of the blocks after the concrete interlocking blocks are bound and the weight m of the row cushion in unit areaPLongitudinal tensile strength F of woven clothPTensile strength of ribbed bar FJThe number of the reinforcing ribs sewed in the transverse direction of the mattress pad and the friction coefficient mu between the soft mattress and the surface of the deck1The coefficient of friction mu between the soft raft and the bank slope2Bank slope angle theta, rated traction force F of traction equipmentWThe distance S between the designed row head position and the water bank line, the lapping width b of the adjacent soft body row and the friction coefficient mu of the lapping part of the soft body row3
Step 2, determining the maximum traction force required by traction, and calculating according to the following formula:
FQ=FC+FA+FD… … … (formula 1)
In the formula, FQ-the traction force required in traction, in units of N;
FCthe friction force generated by the contact part of the soft raft and the spread ship is N;
FAthe friction force generated by the contact part of the soft mattress and the bank slope has the unit of N;
FDthe friction force generated by the overlapping part of the soft mattress has the unit of N;
g is gravity acceleration with the unit of N/kg;
step 3, determining the number of required traction equipment, and calculating according to the following formula:
in the formula, i-number of traction devices
K1The safety factor when the soft mattress is pulled is more than 2
FW-the nominal traction of the traction device in N;
and 4, checking the strength of the mattress, and calculating according to the following formula: k2FQ≤BFP+CFJ… … … (formula 6)
In the formula, K2The stress safety coefficient of the row cushion is more than or equal to 3;
step 5, determining the length and specification of the traction steel beam, wherein the traction steel beam is made of a steel pipe, and the outer diameter of the steel pipe is slightly smaller than the diameter of the row head reinforcing ring, so that the steel pipe can conveniently penetrate through the row head reinforcing ring; the wall thickness of the steel pipe is not less than 10 mm; the number of the traction steel beams is the same as that of the traction equipment; mounting intervals are reserved between the traction steel beams and the transverse edges of the mattress pads; the length of a single traction steel beam is calculated by the following formula:
in the formula, LG-the length of the traction steel beam in m;
lp is the distance between adjacent traction steel beams, the unit is m, and the distance is 1-3 m;
lr is the distance between the transverse edge of the row cushion and the traction steel beam, the unit is m, and the distance is 1-2 m.
2. The construction method of interlocking block soft body row laying in low water level shoal of high beach according to claim 1, characterized in that: the concrete interlocking block soft body row comprises a row pad and a concrete interlocking block, wherein the row pad is formed by sewing woven cloth and reinforcing bars, and the concrete interlocking block is bound on the row pad in an array distribution manner.
3. The construction method of interlocking block soft body row laying in low water level shoal of high beach according to claim 1, characterized in that: the positioning of the laying ship is carried out according to the laying position of the soft row in the engineering design book and GPS actual measurement data, and the center line of the deck of the laying ship is coincided with the center line of the area where the soft row needs to be laid by adjusting the anchor position of the laying ship; on the premise of meeting the draught requirement of the laying ship, the laying ship is positioned as close to a bank slope as possible.
4. The construction method of interlocking block soft body row laying in low water level shoal of high beach according to claim 1, characterized in that: the traction equipment positioning is to equally divide the transverse area of the soft body row to be paved according to the number of the traction equipment when a plurality of traction equipment are used according to the position of the berthing ship, each traction equipment is placed in the middle of each equal division, and the distance between every two adjacent equipment is equal to the sum of the length of a single traction steel beam and the installation distance between every two adjacent traction steel beams.
5. The construction method of interlocking block soft body row laying in low water level shoal of high beach according to claim 1, characterized in that: the soft mattress traction is realized by loosening the clamping mattress beam and the roller when the longitudinal length of the soft mattress bound with the concrete interlocking block is close to the length of the deck, starting traction equipment to pull the soft mattress and discharging mattress pads; when the discharged row cushion is close to the turning plate, stopping traction, braking by the roller, and continuously binding the concrete interlocking blocks and the moso bamboo tubes; after binding, the soft raft is pulled again, and the process is repeated until the concrete interlocking block at the front end of the soft raft is close to a water shoreline, and the fixed raft pad of the row beam is braked, braked by a roller and falls down by a traction device; the longitudinal direction of the soft raft is vertical to the river bank direction, and the transverse direction of the soft raft is along the river bank direction.
6. The construction method for laying the interlocking block soft body row in the low-water-level beaches and the shoal areas, according to claim 5, is characterized in that: keeping the soft mattress traction at low speed and constant speed, wherein the speed is less than or equal to 0.2 m/s; when a plurality of traction devices are used for traction together, the traction speeds of the traction devices are kept synchronous.
7. The construction method of interlocking block soft body row laying in low water level shoal of high beach according to claim 1, characterized in that: after the concrete interlocking blocks are bound, cutting off the polypropylene ropes longitudinally connected with the concrete interlocking block units within the overlapping width range, putting the polypropylene ropes into the mao bamboo tubes, wherein the diameter of each mao bamboo tube is equal to or slightly larger than the thickness of each concrete interlocking block, and the mao bamboo tubes and the soft body row are bound and fixed through the polypropylene ropes.
8. The construction method of interlocking block soft body row laying in low water level shoal of high beach according to claim 1, characterized in that: after the row heads are fixed, the row cushions on the bank are bound by constructors according to the design to complete the laying operation, and the soft row in the deep water area is laid by using a laying ship to sink and construct.
CN202010640958.2A 2020-07-06 2020-07-06 Construction method for laying interlocking block soft mattress in high-beach shallow water area under low water level Active CN111636372B (en)

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