Variable-pitch wall forming device for press-fit type underground diaphragm wall and usage method thereof

Abstract

Provided is a variable-pitch wall forming device for a press-fit type underground diaphragm wall, comprising a wall shoe ( 3 ), vibration chambers ( 4 ), a fixed-pitch box ( 1 ) and a variable-pitch box ( 2 ), wherein the variable-pitch box ( 2 ) is installed in the fixed-pitch box ( 1 ), the wall shoe ( 3 ) is installed on the bottom of the variable-pitch box ( 2 ) and the fixed-pitch box ( 1 ), and the vibration chambers ( 4 ) are provided on a side wall of the fixed-pitch box ( 1 ) and a side wall of the variable-pitch box ( 2 ). Also provided is a method of variable-pitch wall forming for a press-fit type underground diaphragm wall.

What is claimed is: 
     
         1 . A variable-pitch wall-forming device for a press-fit underground continuous wall, comprising: a wall shoe ( 3 ), a vibration chamber ( 4 ), a fixed-pitch box ( 1 ), a variable-pitch box ( 2 ), wherein the variable-pitch box ( 2 ) is installed in the foxed-pitch box ( 1 ), the wall shoe ( 3 ) is installed at bottoms of the variable-pitch box ( 2 ) and the fixed-pitch box ( 1 ), the vibration chamber ( 4 ) is installed on side walls of the fixed-pitch box ( 1 ) and the variable-pitch box ( 2 ). 
     
     
         2 . The variable-pitch wall-forming device according to  claim 1 , wherein the fixed-pitch box ( 1 ) comprises a main body ( 5 ), a point connector ( 6 ), and an outer box body ( 7 ), wherein the main body ( 5 ) is an open rectangular box body having a “U” shape horizontal cross section, a long side ( 15 ) of the main body ( 5 ) is 400-1200 mm long, a short side ( 8 ) of the main body ( 5 ) has an inner dimension of 200-1000 mm and an outer dimension of 300-1100 mm; the vertical sides of the short side ( 8 ) are vertically connected or welded Two pieces of the same shape and size are arranged at the center of the short side ( 8 ), and the dovetail shaped rectangular body is called as the point connector ( 6 ). The dovetail groove ( 10 ) of each point connector The vertical center is vertical; the dovetail slot ( 10 ) is used to join the dove-tail convex track ( 11 ) of the adjacent wall-forming device; the wall-connecting device and the distance— 10 ) or dovetail convex track ( 11 ) can not be separated or moved radially, the main body ( 5 ) can be continuously butted together to form a plurality of upper and lower segments, the point connector ( 6 ) is butted on the upper and lower segment decks ( 12 ) is provided with a sealing groove ( 13 ) on one side to facilitate the installation of the sealing ring ( 14 ) to prevent leakage, and the inner wall of the two long sides ( 15 ) of the main body The appropriate position on each side of the system has horizontal arc slot ( 18 ), the length of the leading segment ( 18 ) is made less than 50 meters, and the bottom end of the leading segment ( 18 ) is closed by the wall boots ( 3 ) ( 18 ′) vertical docking with the leading segment ( 18 ), the upper and lower sections of the upper and lower sections are fixed with butt bolts ( 9 ) and the upper and lower sections of the outer box body ( 7 ) has the same shape and structure as the main section ( 18 ), and the outer box body ( 7 ) has a thickness corresponding to the axial dimension of the main body long edge ( 15 ) A uniform rectangular box body is arranged along the vertical direction of the main body at a distance from each other and is fixed on the outer wall of the long side of the main body by a countersunk head bolt, Pitch is not directly related to, but with the pressure wall cylinder stroke to be consistent, the outer box body ( 7 ) in the cross-section vertical set for the cable duct ( 31 ), duct ( 32 ), water pipe ( 33 )), The shoulder ( 20 ) is arranged on the corresponding edge of the upper and lower sections of the outer box body ( 7 ), the vibration plate ( 21 ) is mounted on the shoulder ( 20 ). 
     
     
         3 . The variable-pitch wall-forming device according to  claim 1 , wherein the variable-pitch box ( 2 ) comprises a drawer box ( 22 ), an assembled outer box body ( 7 ′), and a dove-tailed convex track ( 11 ), wherein the variable-pitch box ( 2 ) has the same shape as the drawer box ( 22 ) long side ( 15 ′) and the inner short side ( 23 ) with the length of the main body long side ( 15 ) and short side ( 8 ) of the inner diameter with the only with tolerance; drawer box ( 22 ) ( 16 ) of the upper and lower horizontal arc grooves ( 16 ) of the inner side wall ( 15 ) are provided with mutually parallel long horizontal arc convex rails ( 17 ), the drawer box ( 22 ) extends from the opening of the main body) Is inserted into the inner cavity of the main body ( 5 ) and moves horizontally along the long side of the main body ( 15 ) to closely contact the inner wall of the short side ( 8 ) of the main body, vertically up and down two horizontal arcuate grooves ( 16 ) Limit displacement, bottom of drawer ( 22 ) Elevation of base=bottom of base ( 5 ) Elevation of height−wall of ramp ( 25 ) Height, The drawer box ( 22 ) is located at the short side ( 23 ) of the short side of the inner cavity of the main body  5 , and the short side ( 24 ) at the open end of the main body ( 5 ) ( 24 ′), the total length of the outer short sides ( 24 ) of the winged wings ( 24 ′) is equal to the length of the inner short sides ( 23 )+the thickness of the assembled outer box body ( 7 ′ A dovetail convex track ( 11 ) is vertically long or intermittently arranged at the center of the short side ( 23 ) outside the box, and the dove-tailed convex track ( 11 ) is used for hinging into the dovetail groove ( 10 ) adjacent to the wall—The final spacing between the two wall-forming devices during the final encircling is no more than one and only less than the axial distance between two wall-forming devices. Therefore, the outer box of the drawer box ( 22 ) can not be made into a fixed size but instead ( 7 ′) is fixed to the outer sidewalls of two long sides ( 15 ′) of the drawer box by the countersunk head bolts ( 9 ′), and the outer box body Vertical length of the main body with the outer box ( 7 ), the thickness=the thickness of the main body of the outer shell ( 7 )+the length of the main body long edge ( 15 ); when used according to the actual distance between the two walls before and after the device to choose different width assembled Box ( 7 ′) composed of more than 1 less than 2 range of any width, combined with the drawer ( 22 ) with axial displacement fine-tuning characteristics can be successfully completed wall into the wall device at the end of the encirclement of more than 1 less than 2 The mechanical connection between the wall mount device wheelbase. 
     
     
         4 . The variable-pitch wall-forming device according to  claim 1 , wherein the wall shoe ( 3 ) is a triangular prefabricated reinforced concrete component as seen from the front elevation, with a certain slope ( 25 ) at the upper end; a step ( 26 ) protruded horizontally around the slope ( 25 ) and the lower plane; The step ( 26 ) is provided with a groove ( 27 ) on the plane for receiving the gasket, and when the upper end slope ( 25 ) of the wall shoe ( 3 ) is inserted into the cavity of the lower part of the main body ( 5 )+drawer box ( 26 ) of the shoe assumes all the pressing force transmitted from the lower end face of the distance box ( 1 )+the distance box ( 2 ), and the wall shoe ( 3 ) is pressed by the soil body against the seal ( 1 )+Tilt Box ( 2 ) bottom surface, mud or impurities can not enter the distance box ( 1 )+Tilt Box ( 2 ))+Variable tank ( 2 ), due to soil side friction and the distance box ( 1 )+the tank ( 2 ) Rise, is permanently left in the ground, wall boots ( 3 ) section size can be selected according to the distance box ( 1 )+variable size ( 2 ). 
     
     
         5 . The variable-pitch wall-forming device according to  claim 1 , wherein the vibration chamber ( 4 ) includes a main body frame, a vibration plate, a vibrator, a water outlet valve, a cable, an air duct and a water pipe. A vibrating plate ( 21 ) is set between every two outer boxes in a vertical direction of the distance box ( 1 )+variable box ( 2 ), wherein the outer box comprises an outer box body ( 7 ) ( 7 ′), the upper and lower ends of the countersunk head bolt ( 9 ′) is fixed to the corresponding two sections of the outer box shoulder ( 20 ), horizontally to the two wings with countersunk head bolts ( 9 ′ ( 28 ) and drawer box frame ( 28 ′), thus forming a fully enclosed cavity volume called the vibration chamber ( 4 ); the main frame ( 28 ) welded to the main body long side ( 15 ) The drawer box frame ( 28 ′) is a movable frame and is fixed to the main frame ( 28 ) and the drawer outer short wing ( 24 ′) with bolts ( 9 ′ The main frame ( 28 ) is large, and the vibration plate ( 21 ) is arranged to finely adjust the horizontal distance in its plane. The “Ω” card for the electric vibrator and the air source vibrator are mounted on the vibrating plate  21 ) inner wall, cable ( 31 ), duct ( 32 ) And the water pipe ( 33 ) are all selected to be arranged in the vibration chamber ( 4 ) along the longitudinal direction of the longitudinal range of the cross-section of the outer box body ( 7 ) of the distance adjustment box ( 1 ) ( 19 ) for the water pipe ( 33 ), cable duct ( 31 ) or duct ( 32 ); the water pipe ( 33 ) is set according to the required number of the electric vibrator ( 29 ) and the water outlet valve ( 34 ) and the outlet manifold ( 34 ′) are each provided with one; if the air source vibrator ( 29 ) is used, the cable duct ( 31 ) is changed into the duct ( 32 ); the lowermost vibration chamber  4 ), and the water pipe ( 33 ) of the uppermost vibration chamber ( 4 ) of the extension section ( 18 ′) are arranged in series with the horizontal circulation pipe ( 35 ). The cooling water is pushed into the water main pipe by the water pump and flows into the lower horizontal circulation ( 35 ) into the adjacent first water pipe ( 33 ) and then from the first water pipe ( 33 ) into the upper horizontal circulation pipe ( 35 ) into the second water pipe ( 33 ) and down into the horizontal circulation pipe  35 ) to enter the third water pipe ( 33 ) to go up . . . and circulate to the water outlet pipe ( 34 ′) finally to the cooling water tank, and after being cooled by the cooling water tank, it is repeated by the water pump into the water inlet pipe ( 34 ) Cycle, vibrating plate ( 21 ) mounted inside the inner wall The valve ( 30 ) and the water outlet hole ( 36 ) of the water outlet valve ( 30 ) communicate with the corresponding water outlet ( 37 ) of the vibration plate ( 21 ); water in the water outlet valve ( 30 ) The strength is reduced and the vibrator can be activated if necessary ( 29 ). When the vibrating force, the amplitude and the wetting superposition effect, the main body ( 5 ) is difficult to be squeezed in or out, and the cable duct ( 31 ), the air duct The water pipes ( 33 ) are respectively fixed on the outer wall of the long side ( 15 / 15 ′) of the main body  5 +the drawer box ( 22 ) in the vibration chamber ( 21 ) by the “Ω” shaped plate. 
     
     
         6 . The variable-pitch wall-forming device according to  claim 1 , wherein the electric vibrator ( 29 ) is a high-temperature component in operation and requires a large amount of cooling water. The air source vibrator ( 29 ) does not require water cooling nor direct power supply, and is a relatively safe and preferable vibration device. The vibrator Function is to produce a certain exciting force and amplitude, to reduce the body ( 5 ) squeeze in and out of the friction as well as concrete vibration to provide aids. 
     
     
         7 . The variable-pitch wall-forming device according to  claim 1 , wherein the device comprises the principle and application of variable pitch adjustment, prefabricated wall boots, mechanical connection and closure of three process steps: (1) the principles of variable pitch control and application process steps: According to the actual distance between the two wall-forming devices that have been squeezed into the ground before and after, The drawer box ( 22 ) is moved to the right place to start assembly; if the actual distance between the two wall-mounted devices that have been squeezed into the ground is finely adjusted within the drawer box ( 22 ), only the drawer box ( 22 ), There is no need to add the assembled outer box body ( 7 ′). Therefore, the drawer box ( 22 ) and the vibration board ( 21 ) have fine pitch characteristics of arbitrary pitch variation. By mastering this characteristic, the fixed size outer box body  7 ′) and the vibrating plate ( 21 )+the drawer box ( 22 ) can be combined to form a pitch changing wall device capable of adapting to ten million pitch values. (2) The wall boots ( 3 ) are prefabricated in advance. Process steps: 3) is based on the final total length of the bottom wall of the device into the wall to produce the total axial size, in advance and can not accurately grasp the value, but in actual use in order to maintain continuous operation on the need to advance precast; empirically estimated wall boots ( 3 ) Axial dimensions, prefabricated when the step ( 26 ) section should not be large, The cross-section does not affect the use of large effect, increasing the squeeze into the end of the area can be ignored; and slope ( 25 ) section should be small and should not be large, slope ( 25 ) Cavity is difficult or impossible, and the section is small enough to be filled with dry hard concrete or other filling material; (3) mechanical connection closure: when the variable pitch wall-mounted drawer box ( 22 ) moves axially, the short side  23 ) is moved along with the short side ( 23 ) in the drawer box body ( 5 ) cavity position is not fixed, first of all to be solved is based on the main body ( 5 ) and drawer short side Cavity size Produce two reinforced cages, respectively, placed in the main body ( 5 ) and drawer box ( 22 ) of the two cavities to increase the rigidity of the wall included in the calculation, variable pitch wall device as crowded into the wall when the final encirclement of the machinery Connecting device, which is to be connected at one end of the first squeeze into the closed wall device, the other end is squeezed into the ordinary wall device; need to grasp the correct process sequence: the first step, on the same axis, will pitch Wall-mounted device dovetail convex track ( 11 ) can only be aimed at closing the wall device dovetail groove ( 10 ), and change The dovetail groove ( 10 ) of the walling device can only be aligned with the dove-tail convex track ( 11 ) of the adjacent final walling device; in the second step, the walling device will be turned into two devices Underground wall into the device connector and gradually squeezed into the ground to a predetermined depth, so the final squeeze into the wall around the mechanical connection process is completed; the first step, first pouring the first closed concrete wall device and gradually pulled out, Step 4, and then pour the other end of the final into the ordinary wall into the concrete device and gradually pulled out, the fifth step, the final pouring into the concrete wall device and gradually pull out into the wall eventually gapless connection.